Herein, Mn 2+ improves the capacity retention of the ICRFB by inhibiting hydrogen evolution reaction and activating Cr 3+ /Cr 2+ activity with 0.002 mol L −1 Mn 2+ , resulting the great enhancement with capacity retention from 39 % to 73 %.

Selective vanadium extraction from ultrahigh Cr/V ratios systems remains a key challenge, particularly preventing the generation of chromium-containing solid waste, which poses substantial environmental and material-handling concerns. To enable a cleaner vanadium recovery process from chromate systems, polyethyleneimine-functionalized α-CrOOH was designed via a two-step synthesis. The resulting PEI@CrOOH, enriched with abundant –NH+=/–NH2+- functional groups, integrates the intrinsic structural stability of α-CrOOH with the strong chelation capability of PEI, achieving a high equilibrium adsorption capacity of 120.18 mg·g−1 for V(V). In both Cr–V binary systems and simulated chromite leaching solutions, PEI@CrOOH exhibits pronounced selectivity toward vanadium over chromium. DFT calculations further elucidate the origin of this selectivity, revealing substantially more negative adsorption energies for H3V10O283⁻ (−478.1 kJ·mol−1) compared with those for Cr2O72⁻ (−214.9 kJ·mol−1) and HCrO4⁻ (−141.7 kJ·mol−1). The adsorption mechanism is primarily attributed to coordination interactions and redox reactions, with additional contributions from electrostatic attraction and hydrogen bonding. PEI@CrOOH demonstrates excellent reusability, maintaining high adsorption efficiency over multiple regeneration cycles. Moreover, the spent adsorbent can be sustainably upcycled via calcination into high-purity Cr2O3 (99.33%), thus eliminating secondary waste generation. This work presents a technically feasible strategy for the purification and selective extraction of vanadium from chromite leaching solutions.

The iron-chromium redox flow battery (ICRFB) has emerged as one of the most promising technologies for large-scale energy storage systems. At the same time, the parasitic hydrogen evolution reaction (HER) during the negative process remains a challenge for the long-term operation. To solve this issue, Mn2+ is used as an additive to enhance the stability and performance of ICRFBs. The results demonstrate that Mn2+ not only effectively inhibits HER but also accelerates the kinetics of Cr3+/Cr2+ and Fe3+/Fe2+ to some extent. Notably, the introduction of 0.002 M Mn2+ into the electrolyte significantly enhanced the coulombic efficiency (CE) and capacity retention of the battery. Specifically, at a current density of 40 mA cm-2, the CE increased from 96.34% to 97.15%. Furthermore, after 100 long-term cycles, the Mn2+-modified electrolyte retained 73% of its initial discharge capacity, whereas the pristine electrolyte exhibited only 39% retention. This performance enhancement can be attributed to two key mechanisms. The negative shift of the hydrogenation potential induced by Mn2+ doping effectively inhibits the hydrogenation side reaction, and this result is also verified in the DFT (Density Functional Theory) calculations. The Mn2+ in the solution increases the electrochemical activity of the reaction system, thereby reducing the degradation of the electrolyte. These findings provide critical insights into the design of effective electrolyte additives for high-performance ICRFBs, highlighting Mn2+ as a promising candidate for mitigating capacity fade and improving overall electrochemical efficiency.

The commercialization of iron-chromium redox flow batteries (ICRFBs) is severely hindered by the kinetically inert [Cr(H2O)6]3+complex, which simultaneously restrains Cr3+/Cr2+ redox kinetics and accelerates parasitic hydrogen evolution. Herein, we demonstrate that ammonium acetate (AMA) acts as a unidirectional molecular switch to trigger irreversible ligand-exchange catalysis via stepwise regulation of the Cr3+coordination micro-environment: the NH4+ cation first initiates the substitution of coordinated H2O by Cl-to "activate" the electroactive [Cr(H2O)5Cl]2+ intermediate, and acetate anions (Ac-) subsequently displace Cl-to "stabilize" the highly diffusive [Cr(H2O)5(Ac)]2+ complex, thus completing the one-way ligand-exchange catalytic process and enhancing the Cr3+diffusion. As a result, this unidirectional molecular switch extends the cycle life by nearly 600-fold (36% capacity retention after 1000 cycles vs. 0.06% for the pristine electrolyte with 100 cycles) and increases the hydrogen evolution reaction (HER) overpotential by 60 mV, enabling a stable discharge capacity of 345 mAh at 40 mA cm-2. This work establishes a potentially generalizable ligand-exchange design principle for high-performance aqueous redox flow battery systems with long-cycle-life.

Circularly polarized luminescence (CPL) materials have shown great application potential in the fields of three-dimensional displays, bioimaging, and information encryption and decryption. The chirality enhancement of CPL by a physical chiral environment, involving the delivery of structural asymmetry from helical architectures to luminescent molecules through electromagnetic field resonance, represents an innovative approach for constructing high-performance CPL materials. Liquid crystal polymers (LCPs), possessing helical superstructures, show great potential in constructing CPL systems. By modulating the chirality transfer from the helical structural environment of LCPs to luminescent sources via distinct strategies, the CPL properties of LCP-based composites are readily generated and tailored. This review summarizes the newest construction strategies of LCP-based CPL materials and provides a perspective on their emerging applications and future opportunities. This review can deepen our understanding of the fundamentals of chirality transfer and shed light on the development of functional chiral luminescent materials.

There are abundant inorganic salt resources in the oilfield brines of the Nanyishan Area,in the Qaidam Basin.However,the high content of organic matter in oilfield brines may cause adverse effects on the development and utilization of the brine resources.Volatile organic compounds(VOCs)commonly ex-ist in oilfield brines.Investigation of VOCs can help comprehensively understand the compositions and fea-tures of organic components in oilfield brines.In this paper,a single factor analysis procedure was used to establish a non-targeted analysis method for analyzing the compositions of VOCs in oilfield brines from the Nanyishan Area by optimizing the experimental conditions of headspace solid phase microextraction.There were significant differences in the non-targeted extraction effects on the four extraction fibers of VOCs in oilfield brines.The extraction efficiency of 50/30 μm Divinylbenzene/Carboxen/Polydimethylsiloxane(DVB/CAR/PDMS)was the best,followed by 75 μm CAR/PDMS,65 μmPDMS/DVB and 100 μm PDMS.Based on the total peak area and peak numbers of the extracted VOC components,the optimal extraction conditions were as follows:50/30 μm DVB/CAR/PDMS extraction fiber,extraction temperature of 80℃,incubation time of 30 min,extraction time of 50 min,and desorption time of 3 min.A total of 56 VOCs were detected in the oilfield brines,mainly including benzene series,alkanes,polycyclic aromatic hydrocarbons and some heteroatom-containing compounds.The results can enrich the knowledge of the compositions of organic matter in oilfield brines from the Nanyishan Area,and provide basic data for the effective treatment or removal of organic matter in oilfield brines in this area during the comprehensive utilization process of oilfield brines.It can also provide reference for the analysis of VOCs in oilfield brines from other areas.

Qinghai Tibet salt lakes are famous for enriching boron and lithium resources. Nevertheless, the chemical species of borate in the brine varies with the chemical type of salt lake, Among them, the existing borate forms in sulfate type salt lake brine are the most complicated, Generally, the borates do not crystallize out from the brine during the whole evaporation process of brine but accumulate in the bischofite saturated brine in different kinds of boron species, which supersaturated with magnesium borates. This phenomenon may significantly impact the subsequent separation and extraction of lithium and magnesium salts. Therefore, the deep research on the chemical forms, species distribution, and their interactions in the salt lake brine is of great significance for the highly efficient development of salt lake resources. Compared with the classical Raman spectroscopy, the simplified Raman integrating sphere, designed based on the Raman scattering principle, can improve the exciting light's efficiency and the Raman scattering signal. It is characteristic of a strong Raman scattering signal, low detection limit, and high signal to noise ratio for the characterization of the borate structures, which favors the quantitative analysis of the chemical forma of the borate in the complicated brine system. Based on the above, this study aimed to investigate the chemical forms of borate in salt lake brine using the Raman integrating spheres, It also elucidated the changes of polyborate ions during the brine evaporation process. Secondly, the response surface method was used to explore the effects of the coexisting salts on the determination of BCOD, in salt lake brine. The results showed that borates in the salt lake brine could be polymerized to form poly borate ions such as B3O3(OH)(4) and B6O7(OH)(7)(2) during the brine evaporation process, which agreed well with the borate changes in the alkaline earth metal solution system of MgCl, MgO ZB, O, H2O, but differed greatly with that changes in alkaline metal solutions. The relative ertor of the B(OH)(3) determination in brine was less than 5% after being corrected by the response surface interference model. Therefore, the distribution of B(OH)(3) in the brine was also studied during the evaporation process, which helped explain the polymerization mechanism among borate ions in brine from a quantitative perspective. In sum, this research could provide new ideas and methods for further study of borate speciation and their interaction mechanism in complicated brine systems,

The cleaning process toward electrosynthesis of lithium hydroxide based on ionic membrane is designed in this paper.The electrochemical synthesis of lithium hydroxide was completed by using lithium sulfate refining solution as anolyte and lithium hydroxide solution as catholyte.The cathode current effi-ciency and unit lithium hydroxide product power consumption were used as indicators to systematically in-vestigate the electrosynthesis conditions and optimize the parameters.The effects of initial concentration of anolyte and catholyte,cycle speed,reaction temperature and current density on the electrolytic conditions were studied,and the optimized experimental parameters were obtained and verified.The experimental re-sults show that when the concentration of anolyte is 200 g/L and catholyte is 25 g/L,the cycle speed is 350 r/min,the reaction temperature is 70℃and the current density is 1 730 A/m2,the electrolytic system has good per-formance.It is verified that under the optimized parameters,the current efficiency of lithium hydroxide is 72.64%,the power consumption of unit product(100%lithium hydroxide solution)is 5 975 kWh/t,and the purity of evaporative crystallization product is 56.7%,which is up to the standard of GB/T26008-2020 battery grade lithium hydroxide.The preparation of lithium hydroxide by ion membrane electrolysis has the merits of high purity,controllable reaction process,high degree of automation,small by-product emis-sion,high economic value and has broad application prospect.

In this study, amino-functionalized magnetic particles (iron oxide@SiO2-NH2) with core-shell structures were synthesized and evaluated for rapid boron removal from aqueous solutions. The results showed that the specific surface area of the iron oxide@SiO2-NH2 (131.24 m2⋅g−1) increased greatly compared to pure iron oxide (30.98 m2⋅g−1). The adsorption equilibrium was less than 2 h, with an adsorption capacity of 29.76 mg⋅g−1 at pH = 6 at 15 °C. The quasi-second-order kinetic model described the boron adsorption process well, and both the Langmuir and Freundlich models were suitable for characterizing the adsorption isotherms. The zeta potential and XPS analysis before and after adsorption revealed that the main adsorption mechanism was the hydrogen bonding formation between the terminal -NH2 groups of the adsorbent and the boric acid. In addition, the adsorbent still maintained a high adsorption performance after five adsorption–desorption cycles, which illustrated that the iron oxide@SiO2-NH2 may be a potential adsorbent for environmental boron removal treatment.

Superhydrophobic surfaces have been fabricated in large quantities via designing suitable micro/nano structures and introducing low surface energies. However, the thermodynamic mechanisms between superhydrophobicity and microstructures still need to be further investigated to better provide a guidance for achieving superhydrophobicity. In this work, a theoretical model based on an actual coating with the microstructures consisting of fibers and nano hemispheres was constructed to analyze the effects of structural parameters on contact angles and free energies, where three wetting phases were defined according to different wetting heights of droplets on the surface. By calculations, the wetting equilibrium states and their corresponding contact angles and structural optimization strategies in the three wetting phases were obtained. Besides, the superhydrophobic coating prepared using magnesium oxysulfate whiskers and SiO2 nano hemispheres was used as an example for the model application. The results of the model analysis showed that there should be two equilibrium states of water droplets on the coating surface. This study is expected to be utilized to guide the design of superhydrophobic surfaces.

Abstract Amino-functionalized magnetic particles (Fe 3 O 4 @SiO 2 -NH 2 ) with core-shell structure were synthesized and evaluated for rapid boron removal from aqueous solution. Results showed that the specific surface area of Fe 3 O 4 @SiO 2 -NH 2 (165.17 m 2 ⋅g − 1 ) increased greatly compared to the pure Fe 3 O 4 (49.07 m 2 ⋅g − 1 ). The adsorption equilibrium was less than 2 h with an adsorption capacity of 29.76 mg⋅g − 1 at pH = 6 of 15°C. The quasi second-order kinetic model described well the boron adsorption process and the Freundlich model was more suitable for characterizing the adsorption isotherms. Furthermore, the negative value of Gibbs free energy indicated that the adsorption was spontaneous and an exothermic process. The zeta potential and XPS analysis before and after adsorption revealed that the main adsorption mechanism was the hydrogen bonding formation between the terminal –NH 2 groups of the adsorbent and the boric acid. In addition, the adsorbent still maintained a high adsorption performance after five adsorption-desorption cycles, which illustrated that the Fe 3 O 4 @SiO 2 -NH 2 may be a potential adsorbent for the environmental boron removal treatment.

铁铬液流电池具有循环寿命长、稳定性高、成本低等特点,在大规模电能储存领域应用日趋广泛.针对铁铬液流电池失效电解液的回收利用开展研究,从CrCl3和FeCl3混合溶液中分离Fe,同时回收Cr和Fe.研究了草酸沉淀法去除三价铬体系中的铁离子,并考察了草酸加入量、溶液pH、反应温度、搅拌速率对铁脱除率的影响.结果表明,当草酸加入量为理论值的1.2倍、溶液pH为3.0、反应温度为25℃时,铁脱除率可达97％以上;所得固相为二水草酸亚铁,结晶形貌好,纯度大于98％.该研究可为铁铬液流电池电解液的综合利用提供有效途径.

Two-dimensional correlation spectroscopy (2D-COS) and three-dimensional excitation-emission matrix fluorescence technologies coupled with parallel factor analysis (EEM-PARAFAC) are characterized by separating overlapping peaks and insight into different component variations. Therefore, the 2D-COS and EEM-PARAFAC technologies can be used to probe into the compositions and spectral changes of dissolved organic matter (DOM). Here, the compositions and variations of DOM in solar ponds isolated from three representative salt lakes, i. e, Qarham Xitaijinaier and Mahai salt lake, were investigated using dissolved organic carbon UV-Visible absorption spectrum (UV) and EEM coupling with 2D-COS and PARAFAC. The results indicated that the contents of DOM and color DOM (CDOM) increased with the prolongation of sunshine times, and they increased 1. 5 vs. 1. 0, 8. 2 vs. 5. 3 and 15. 7 vs. 11. 0 times for DOM and CDOM they originated from Qarham Xitaijinaier and Mahai, respectively. Moreover, the values of SUVA254 and HIX decline in solar ponds suggested that the relative contents of aromatic compounds were decreased. The 2D UV-COS results indicated that the DOM with absorption peaks at 230, 217 and 235 nm were susceptibility in solar ponds, and following the sequence; 228>229>230>231>232 nm &235>234>233>232 nm, 200>216>300 nm and 201>203>231>232>237>238>281>217 nm for Qarham Xitaijinaier and Mahai, respectively. The EEM-PARAFAC results revealed that the salt lake DOM is mainly composed of four humic-like substances, i. e., marine humic-like component CDEx/Em: 320/400 nm), humic-like acids C2 (Ex/Em; 250/400 nm) and C3 (Ex/Em; 260/400 nm), hydrophobic humic acid C5 (Ex/Em: 280, 360/430 nm) and one protein-like substance C4 (Ex/Em; 280/350). The percentages of humic-like substances were 84. 0%, 87. 2% and 93. 1,y0 in total fluorescent contents in Qarham, Xitaijinaier and Mahai, respectively. Along with the sunshine extent, the relative contents of Cl C2 and C3 exhibited an initial decrease followed by a gradual decline or stabilization, especially C2 absence from the tail brine, indicating its lability. C3 and C4 exhibited an initially decrease, followed by the gradual increase in the solar ponds of Qarham and Mahai. Compared to other components, C3 and C4 were more refractory to degrade, i. e. 6. 7% <C3/C4<75. 2% vs. 52. 8% <C1/C2/C5<100%.

The as-cast Al-4.6Mg alloy was subjected to deformation and sensitization–desensitization heat treatment, and then the microstructure and the enhancement mechanism of Sr were investigated by optical microscopy, scanning electron microscopy–energy-dispersive spectroscopy, electron backscatter diffraction, and transmission electron microscopy. The precipitation phases of Al-4.6Mg alloy were mainly β-Al3Mg2, Al6Mn, and Al6(Mn Cr), and the nanoscale precipitation phases were Al3Mn and Al11Mn4. The formation of β-Al3Mg2 was hindered by the addition of 0.1 wt.% Sr. In addition, the precipitate phase Al4Sr and the nano-sized precipitate phase τ-Al38Mg58Sr4 were uniformly distributed in the spherical matrix. The addition of Sr promoted the redissolution of Mg atoms in Al-4.6Mg alloy, increasing the solubility of Mg in the α-Al matrix from 4.7 wt.% to 5.1 wt.%. The microstructure analysis showed that Sr addition inhibited the recovery and recrystallization of the alloy because the Sr element elevated the recrystallization temperature. As a result, the grain deformation was intensified, the grain size was decreased from 6.96 μm to 5.39 μm, the low-angle grain boundaries were increased from 78.7 at % to 84.6 at %, and the high-angle grain boundaries were increased from 21.3 at % to 15.4 at %. Furthermore, the mechanical properties of the alloy were significantly improved, and the plasticity degraded after the addition of the Sr element. The yield strength of the alloy was enhanced mainly through fine grain strengthening, dispersion strengthening, solid solution strengthening, and working hardening. The strengthening mechanisms were analyzed in detail.

Abstract Amino-functionalized magnetic particles (Fe3O4@SiO2-NH2) with core-shell structure were synthesized and evaluated for rapid boron removal from aqueous solution. Results showed that the specific surface area of Fe3O4@SiO2-NH2 (165.17 m2⋅g− 1) increased greatly compared to the pure Fe3O4 (49.07 m2⋅g− 1). The adsorption equilibrium was less than 2 h with an adsorption capacity of 29.76 mg⋅g− 1at pH = 6 of 15°C. The quasi second-order kinetic model described well the boron adsorption process and the Freundlich model was more suitable for characterizing the adsorption isotherms. Furthermore, the negative value of Gibbs free energy indicated that the adsorption was spontaneous and an exothermic process. The zeta potential and XPS analysis before and after adsorption revealed that the main adsorption mechanism was the hydrogen bonding formation between the terminal –NH2 groups of the adsorbent and the boric acid. In addition, the adsorbent still maintained a high adsorption performance after five adsorption-desorption cycles, which illustrated that the Fe3O4@SiO2-NH2 may be a potential adsorbent for the environmental boron removal treatment.

采用C18、PPL、HLB三种固相萃取材料对四川盆地普光地区一处油田卤水中的DOM进行了富集分离并采用FTIR和Py-GC/MS对所分离的DOM进行了表征.结果表明,PPL和HLB的组合吸附剂对油田卤水DOM的富集效率较好,C18富集效率最低.所研究油田卤水DOM中主要含有有机酸、含硫化合物、芳香族化合物、碳水化合物、脂肪族化合物以及含氮有机物等.其中含硫有机物和有机酸所占比例较多.这可能是由于该区域海相层系中发育着多种类型的含硫物质,可通过生物地球化学作用而生成种类繁多的含硫有机物.而有机酸作为微生物生长的营养物质,又在一定程度上促进了含硫有机物的形成.通过比较发现,地质条件/成因以及水质参数等因素都会影响油田卤水DOM的组成特征.针对不同地域及不同形成机制的油田卤水中DOM的结构组成做系统性研究,可为后续DOM的有效处理提供科学依据.

Removing impurities from hexavalent chromium system without secondary pollution is the key to the successful development of green chromate production technology. Here, hydrated chromium oxide CrOx(OH)3-2x with lamellar cluster microsphere structure was prepared by in-situ hydrothermal method and used to simultaneously adsorb Si (IV) and V (V) in high concentration Cr (VI) solution. In the in-situ hydrothermal process of pH 7, 160 celcius for 8 h, the Si (IV) and V (V) removal rates of the actual chromate production Na2Cr2O7-Na2SiO3-NaVO3-H2O solution can reach 92.27 % and 94.81 %, respectively, which is higher than the ex-situ removal efficiency of Si (IV) (62.88 %) and V (V) (63.16 %) under the same conditions. Further characterization of STEM-elemental mapping, XPS and FT-IR results indicate that during in-situ adsorption, Si (IV) and V (V) are mainly adsorbed on the surface of CrOx(OH)3-2X adsorbent by interacting with surface hydroxyl groups. More importantly, the simultaneous formation and adsorption of the adsorbent are more conducive to the full utilization of active adsorption sites on the adsorbent surface. After that, CrOx(OH)3-2x was converted into nano Cr2O3 with a purity of 97.87 % by simple desorption and calcination processes. In addition, the results of UV-vis DRS and SEM show that the residual Si and V elements in Cr2O3 unexpectedly increase the size of the particles to about 300 nm, which redshifts the absorption band of the blue region by 3.3 nm. This results in more red absorption and makes Cr2O3 more yellowish-green and exhibits excellent pigment properties. Thus, the in-situ synthesis, synergistic adsorption and green conversion of trivalent chromium adsorbent provide a promising and sustainable technology for the purification of high concentration Cr (VI) solution that avoids the discharge of Cr (VI) containing slag.

How to effectively and environmentally purify chromate solutions containing impurities such as silicon and vanadium, and avoid the generation of Cr(VI)-containing residues are important issues to be solved urgently. Herein, a novel Cr2O3 center dot 2.7H2O adsorbent with stable three-dimensional nanoflower structure was fabricated using the hydrothermal method, which was successfully implemented in the removal of Si(IV) and V(V) from dichromate system. Batch adsorption experiments revealed that the saturated adsorption capacity of Si(IV) was 140.06 mg/g at pH 9 and 132.98 mg/g V(V) at pH 2. Furthermore, density functional theory (DFT) calculations revealed that V(V) anionic species exhibited high adsorption energies (-990.70 kJ/mol,-697.10 kJ/mol) and small adsorption distances from the beta-CrOOH(012) (approximate to 1.89 angstrom, 1.98 angstrom), verifying the selective adsorption of Cr2O3 center dot 2.7H2O on V(V) in Cr(VI)-Si(IV)-V(V) ternary systems. The integrated mechanisms of electrostatic interaction, coordination, polymerization and precipitation for the removal behaviors were proposed via FT-IR, XPS and DFT calculations. In the real Na2Cr2O7 complex solutions, the simultaneous removal rates of 88.48% Si (IV) and 80% V(V) were achieved, with optimal adsorption conditions at a pH of 8 and a temperature of 333 K. Furthermore, the desorbed Cr2O3 center dot 2.7H2O can be effectively converted into high-value nano Cr2O3, indicating the potential of this new green adsorbent. Therefore, this study not only imparts theoretical and practical insights into the purification of chromate solutions but also contributes to the advancement of cleaner chromium com-pound production by facilitating the high-value conversion of the adsorbent.

How to effectively and green purify chromate solution containing impurities such as silicon and vanadium and understanding their removal mechanism during the purification process are important issues to be solved urgently. In this study, a novel Cr2O3∙2.7H2O adsorbent with stable three-dimensional nanoflower structure was fabricated by hydrothermal method, which served as adsorbent to capture Si(IV) and V(V) from dichromate system. The effects of pH, initial concentration, the amount of Cr2O3∙2.7H2O, temperature and shaking time on the adsorption performance were investigated. The systematic adsorption tests showed that Si(IV) removal on the Cr2O3∙2.7H2O accorded with the pseudo-second-order model and Freundlich model, while V(V) was more in line with the pseudo-second-order model and Langmuir model, and was dominated by chemisorption. Batch adsorption experiments showed that the saturated adsorption capacity of Si(IV) was 140.06 mg/g at pH 9.0 and 132.98 mg/g V(V) at pH 2.0. Furthermore, the integrated mechanisms of electrostatic interaction, coordination, precipitation, and reduction for the removal behaviors were proposed via FT-IR, XPS and DFT calculations. More importantly, V(V) anionic species had high adsorption energies (-990.7 kJ/mol, -697.1 kJ/mol) and relatively small adsorption distances from the β-CrOOH (012) (≈1.887 Å, 1.982 Å) by the DFT calculations, which demonstrated V(V) can achieve selective adsorption in Cr(VI)-Si(IV)-V(V) ternary system. In the actual Na2Cr2O7 system, the removal rates of Si(IV) and V(V) were as high as 88.48% and 80%, respectively, and the optimal adsorption conditions were pH 9 and temperature 313K. Eventually, resourcelization of desorbed Cr2O3∙2.7H2O onto high value-added by-products Cr2O3 indicated such adsorbent possesses great application potential, which guides significance for resource utilization and environmental protection.

硼酸镁是一种重要的化工原料,广泛应用于玻璃、陶瓷和塑料高分子等行业中.针对活性MgO合成三方硼镁石成本高等缺点,以盐湖水氯镁石为镁源、五硼酸钠(或硼酸和氢氧化钠)为硼源,开展了水热法快速合成三方硼镁石的实验研究.采用动力学方法和拉曼光谱技术对其结晶机理及动力学进行了探讨.结果表明,温度、原料物质的量比对合成三方硼镁石影响较大,当温度为25℃或室温、五硼酸钠和氯化镁物质的量比为1∶8时,三方硼镁石的合成时间短、纯度高.水氯镁石的加入可促进五硼酸钠碱金属溶液中的B3O3(OH)4-缩聚反应生成B6O7(OH)62-,对应溶液则转化为碱土金属硼酸镁过饱和溶液,有利于六硼酸镁盐难溶化合物(三方硼镁石)的结晶析出,晶体生长机制为多核表面反应控制.该研究提供了一种三方硼镁石快速合成的方法,工艺简单且成本低,同时对盐湖镁资源综合利用也具有一定的指导意义.