Defect engineering has emerged as promising strategic tool to enhance the integral electrochemical dynamics and structural stability of transition metal oxides-based anode materials for efficient supercapacitors. Currently, there are no reports on Hafnium doped MnO2 anode with concomitant oxygen vacancies due to low thermal stability and easy phase transition from MnO2 to Mn2O3. The (hafnium) Hf doping in MnO2 is accountable for boosting electrochemical performance by enhancing the electrical conductivity, Oxygen vacancies generation as interpreted by X-Ray Photoelectron Spectroscopy (XPS), Raman spectroscopy, XRD spectra, DFT calculations, enhanced the active surface area due to induced strain (0.395 %) as calculated by Williamson-Hall (W-H) model and enhancing the interlayer spacing. The carbon cloth offers the mechanical strength and enhanced conductivity for ion/charge transportation. Herein, a novel Hf-delta MnO2@CC electrode material for aqueous asymmetric pseudo-super capacitor has been rationally designed by facile hydrothermal method. The as prepared electrode delivered an exceptional high reversible specific capacitance of 524 F/g at a potential window of 0-1 V. When coupled with activated carbon (AC) as cathode, the device Hf-delta MnO2@CC // AC delivered a high specific capacitance of 240 F/g, energy density and power density of 133 Wh/Kg and 999 W/Kg at a potential window of 0-2 V. The whole cell maintained 92.5 % of capacitance retention and columbic efficiency of 97.01 % after 10,000 cycles. This research will unlock new avenues in the practicability of supercapacitors for the next generation electronic devices.

NiCo2O4 for alkaline Zn-based batteries (AZBs) suffers from low capacity and an unsatisfactory cycling life. Meanwhile, the widespread application of NiCo2O4 is seriously limited by costly and tedious synthetic procedures. In this work, a facile and economically efficient surface corrosion strategy is demonstrated to fabricate a high-performance Mn-doped NiCo2O4 (SMNC) nanosheet cathode for AZBs. Compares to the undoped NiCo2O4 (SNC), the SMNC shows enhanced mass transfer ability and increased active sites. Consequently, the Zn/SMNC cell reaches a big areal capacity of 0.58 mA h cm(-2) at 2 mA cm(-2) as well as an ultralong cycle life with 95% capacity retention over 6000 cycles. This work provides an effective, low-cost, and method to prepare advanced cathode materials for AZBs.

In this study, a highly efficient, convenient, and universal protocol of in situ cross-linking copolymerization of 2-hydroxyethyl methacrylate and sodium p-styrenesulfonate in polyvinylidene fluoride (PVDF) solution was presented to prepare blood-contacting material with good blood compatibility. The modified PVDF membranes were prepared by liquid–liquid-phase inversion technology, which could induce the enrichment of hydrophilic groups including sulfonic acid and hydroxyl groups on the surface of the modified PVDF membranes. The hydrophobic-fluorinated PVDF surfaces with hydrophilic sulphonic acid and hydroxyl groups exhibited high performance with prolonged clotting time (activated partial thromboplastin time and thrombin time) and low activation of blood components (platelets, coagulation cascade, and complements) when they contacted blood. On the other hand, the ultrafiltration experiment results revealed the improvement in the antifouling properties of the modified PVDF membranes after the introduction of hydrophilic groups on the membranes surface. The results indicate that the blood-compatible PVDF membranes may have potential to be used in the field of blood purification, and can be used as long-term blood-contacting materials as well.

Here, the thermodynamics and kinetics of Pb2+ adsorption and removal on Ni-MOF-74 from wastewater were studied. The effects of pH value, contact time, Pb2+ initial concentration, Na+ concentration, Ni-MOF-74 loading and adsorption temperature were systematically studied. The results showed a good Pb2+ adsorption capacity of the MOF. The adsorption of Pb2+ was analyzed by using different isotherms as well as different kinetics models. The results showed that Tempkin adsorption isotherm and pseudo-2nd-order kinetics were followed by the adsorption of Pb2+ on Ni-MOF-74. Thermodynamic studies (Delta G<0, Delta H<0) showed that the adsorption process is exothermic and spontaneous. The results revealed that Ni-MOF-74 has a real prospect for the application in the adsorption and removal of Pb2+.

气凝胶具有低密度、高比表面积、高孔隙率等特性,在水污染处理领域具有广阔的应用前景.以天然绿色高分子材料纤维素纳米晶(CNC)和壳聚糖(CS)为原料,通过冷冻干燥法和固相交联技术制备了具有良好水溶液稳定性的CNC/CS气凝胶.采用扫描电子显微镜(SEM)对气凝胶表观形貌进行了表征,采用分光光度法考察了气凝胶对水中六价铬离子(Cr(Ⅵ))的吸附性能,并对吸附结果进行了拟一级和拟二级动力学拟合.结果表明,CNC含量为50％时气凝胶的水稳定性最好,在去离子水中48 h震荡后的质量残留率达到93.8％.气凝胶具有丰富的蜂窝状孔结构,对Cr(Ⅵ)的吸附容量最高可达67.377 mg/g.气凝胶对Cr(Ⅵ)具有较快的吸附速率,当Cr(Ⅵ)溶液浓度低于60 mg/L时能够在24 h内达到吸附平衡.吸附动力学拟合结果表明CNC(50％)/CS气凝胶对Cr(Ⅵ)的吸附行为符合拟二级吸附动力学模型,说明吸附过程以化学吸附为主.

The composite zeolitic imidazolate frameworks@agarose (ZIF-8@AG) was prepared by ZIF-8 and agarose (AG) in this study. The composite ZIF-8@AG with a good quality, was assessed for Pb(II) adsorption and regeneration from water. The effects of the contact time, initial concentration of Pb(II), adsorbent dosage, pH, coexisting ions (Ca2+ and Mg2+), temperature and other factors on the adsorption performance of Pb(II) on ZIF-8@AG were investigated. The pseudo-second-order kinetic model can well describe the adsorption process of Pb(II) on ZIF-8@AG. Thermodynamic parameters (Delta G, Delta H and Delta S) confirmed exothermic and spontaneous process. In the regeneration experiment, ZIF-8@AG maintained a high adsorption capacity for Pb(II) after 6 times of adsorption-desorption cycles. The experimental results showed that the ZIF-8@AG not only has a high adsorption efficiency for Pb(II), but also has a good stability for recycling.

ZIF-67@CS composites were prepared by in-situ growth method. The phase and structure of ZIF-67@CS composite were characterized by X-ray powder diffraction (XRD) and fourier transform infrared spectroscopy (FT-IR). The morphology of the materials was characterized by field emission scanning electron microscope (SEM). X-ray photoelectron spectroscopy (XPS) measurements demonstrated the existence of Pb(II) after the adsorption process of composite materials. The adsorption of Pb(II) by composite material conforms to Langmuir model, the theoretical maximum adsorption capacity is 505.051 mg/g. The pseudo-second-order kinetic model can well describe the adsorption kinetic process.

以海藻酸钠和聚乙烯亚胺为原料,制备海藻酸钠/聚乙烯亚胺(SA/PEI)复合材料,研究其对水中Pb(Ⅱ)的吸附去除性能.系统研究了各因素对SA/PEI吸附Pb(Ⅱ)效果的影响.结果表明,SA/PEI对Pb(Ⅱ)的吸附量与Pb(Ⅱ)初始浓度正相关,在360 min达到吸附平衡.吸附过程符合拟二级动力学和Langmuir等温吸附模型.在303.15 K时,Langmuir等温吸附模型拟合得到的最大吸附量为316.46 mg/g.第6次使用的SA/PEI对Pb(Ⅱ)仍表现出较好的去除效果.

It is a considerable challenge for expanding the applications of self-healing polyurethane because of the dilemma in balancing its mechanical and self-healing properties. Herein, a series of self-healing polyurethane systems (PUT-x) with short-range ordered rigid aromatic structures were synthesized by simply adjusting two kinds of diiso-cyanates, and by ingenious addition of aromatic chain extender. We hope to regulate the ??-?? interactions and further to manipulate the properties of obtained polyurethanes via adjusting the amount of the benzene rings in the molecular chains of the PUT-x systems. The PUT-5 with decent self-healing ability, optimal mechanical properties, acceptable thermal sta-bility and favorable transparency was selected to incorporate liquid metal and fluorescent powder to fabricate conductive wire and anti-counterfeiting film. Significantly, the liquid metal could be recycled from the conductive wire conveniently without using strong acids or strong bases. Moreover, PUT-5 exemplarily withstood long-term soaking in normal saline, and no deformation could be identified.

A Novel Sulphur and Nitrogen-codoped carbon (SNC-800) material was prepared by pyrolysis of functionalized Polyethersulfone (PES) under 800celcius, which was synthesized by one-pot polymerization. The SNC-800 was served as electrode material and showed a high specific capacitance (240 F/g). The capacitance retention of SNC-800 is as high as 91.6% after 10,000 cycles. The device base on delivered a high energy density (23.5 Wh/kg) with power density (800 W/kg). These results suggest that SNC-800 is a promising electrode material for supercapacitors.

以海藻酸钠(Sodium Alginate,SA)为前驱体,将沸石咪唑骨架材料ZIF-8加入SA中,制备出ZIF-8@SA复合材料,并研究了ZIF-8@SA对Pb(Ⅱ)的吸附性能.探讨了接触时间、Pb(Ⅱ)初始浓度、吸附剂用量、温度和吸附-脱附次数等因素对ZIF-8@SA吸附Pb(Ⅱ)效果的影响.对吸附过程进行了吸附等温线、吸附动力学和吸附热力学分析.结果表明,等温吸附过程符合Langmuir模型,303.15 K时,Langmuir模型拟合得到的理论最大吸附量为330.364 mg/g.吸附动力学过程符合拟二级动力学模型.热力学分析表明,ZIF-8@SA对Pb(Ⅱ)的吸附过程是自发的、吸热的.ZIF-8@SA对Pb(Ⅱ)具有很好的吸附效果.

The application of metal-organic frameworks (MOFs) Cu-BTC with good adsorption performance in wastewater treatment is limited due to its powder form. The high crystallinity Cu-BTC was compounded with agarose (AG) to obtain a porous foam-like composite Cu-BTC@agarose (Cu-BTC@AG). The Cu-BTC@AG is easy to recycle, the problem of difficult recovery when Cu-BTC is used in water treatment is well solved. In this paper, the influence of contact time, methylene blue (MB) initial concentration, adsorbent dosage, Na+ concentration, pH and temperature on the adsorption of MB by Cu-BTC@AG were studied systematically. Results showed that the adsorption amount of MB by Cu-BTC@AG increased with increasing of MB initial concentration, and the adsorption equilibrium was reached in 120 min. The solution pH = 7 is favorable for Cu-BTC@AG to adsorb MB. In addition, the adsorption mechanism of MB on Cu-BTC@AG was further explored by isothermal adsorption model and adsorption kinetics model. The adsorption of MB on Cu-BTC@AG was well fitted with Langmuir isotherm and pseudo-second-order model. Maximum adsorption capacities of MB was 282.466 mg/g. The adsorption of MB was carried out through formation of a monolayer adsorption onto the homogeneous surface of Cu-BTC@AG. The adsorption behavior of MB on Cu-BTC@AG was analyzed by adsorption thermodynamics.

The ability of Metal-organic frameworks (MOFs) material Fe-MIL-88NH2 to adsorb heavy metal Pb2+ from wastewater was studied in this paper. The influences of the contact time, initial Pb2+ concentration, adsorbent dosage and pH of solution on the adsorption performance of Fe-MIL-88NH2 were investigated. The adsorption behavior of Pb2+ on Fe-MIL-88NH2 was discussed by using the isotherm model and adsorption kinetic model. The Fe-MIL-88NH2 showed good adsoption capacity for Pb2+. The adsoption process of Pb2+ on Fe-MIL-88NH2 was better described by Freundlich isothermal and pseudo-second-order kinetic model. The Fe-MIL-88NH2 showed excellent recycling capability in the cyclic adsorption process. The results indicated that Fe-MIL-88NH2 has a good application prospect in the removal of Pb2+ from wastewater.

Different sulfur-doped content carbon is fabricated by the carbonization of SSNa modified PES, the pores and abundant heteroatoms endow the S-doped porous carbon (C-3) with a high capacity of 172 F/ g at 1 A/g and good cycling life (98.5 % retention after 6000 cycles). Moreover, typical dye of methylene blue adsorption results exhibited the maximum adsorption capacity of sulfur-doped carbon (C-3) was approximately 78 mg/g. The enhanced electrochemical performance of C-3 is ascribed to the sulfur-doping and ellipsoid structure. The results pave a new way to fabricate controlled heteroatom-doped content carbon material for supercapacitors and dyes adsorption through the cross linking heteroatom-containing polymer.

A new 2D Mn-MOF (Mn-PRCA, PRCA = pyrazine 2,3-dicarboxylic anhydride) is constructed and used as a host for the loading of Ni2+ through post-synthetic modification method (PSM). Then the bimetal MOF(Ni@MnPRCA) is served as template for the synthesis of Ni0.4Mn1.6P by the phosphorization route. The obtained Ni0.4Mn1.6P is used as electrode material and exhibit a large specific capacitance of 1060 F/g at 1 A g and a capacitance retention of 75 % after 2000 cycles). In addition, an asymmetric device Ni0.4Mn1.6P // AC (activated carbon) is also assembled and shows an energy density of 21.1 W h kg(-1) at the power density of 799.6 kW kg(-1) under a stable working voltage of 1.6 V. This is the first time that PSM technique is applied in electrochemical application and bimetal phosphide derived from a new MOF is used as electrode materials for supercapacitor.

A new lanthanide coordination polymer (LnCPs) of {[Tb-2(4-BMBA)(6)(H2O)(4)]center dot(4,4' -bpy)} n (TbCPs, 4-BMBA = 4-bromo-3-methylbenzoic acid, 4,4'-bpy = 4,4'-bpy) was obtained successfully by the introduction of 4-BMBA. The optical properties of TbCPs are studied, and in the subsequent sensing experiments, it is found the TbCPs is a highly selective sensor for Ca2+, and it shows excellent electrochemical property. (C) 2021 Elsevier B.V. All rights reserved.

In the present investigation, the applicability of the adsorption and removal of the toxic organic dye Congo red (CR) from industrial wastewater using metal organic framework (MOFs) Fe3O(OH2)3Cl(NH2-BDC)3·9.5H2O (Fe-MIL-88NH2) was evaluated. The influence of contact time, initial CR concentration, adsorbent dosage, ionic strength and temperature on the adsorption properties of Fe-MIL-88NH2 were investigated. The Langmuir and Freundlich and Tempkin isotherm models have been used to discuss the adsorption behavior of CR on Fe-MIL-88NH2. Tempkin adsorption isotherm model was found to be most suitable for the adsorption of CR. Different kinetic parameters were obtained by studying of adsorption kinetics on the basis of the pseudo-first-order, pseudo-second-order and intraparticle diffusion kinetic equations. The pseudo-second-order kinetic equations is most suitable for adsorption of CR on Fe-MIL-88NH2, which indicates that the removal of CR are mainly carried out by chemical adsorption process.

A new nickel metal organic framework (MOF) based on 4-cyan-5-acidamide-bisimidazole were fabricated using hydrothermal method. The Co@Ni-MOFwasprepared by doping Ni-MOF with Co2+through post-synthetic modification method. The bimetallic Co0.4Ni1.6P was obtained through phosphorization of Co@Ni-MOF and showed high specific capacity 330F/g at 1 A/g and capacity retention was 96% over 5000 cycles. The supercapacitor device was prepared (Co0.4Ni1.6P//AC) and demonstrated specific energy of 30.9 Wh/kg at power of 806 W/kg. These results provided a new way to design bimetallic phosphide (MOF-based materials) for supercapacitor application.

以均苯三甲酸和六水合硝酸钇(Ⅲ)为原料,合成了一种稀土金属有机骨架材料Y (BTC) (H2O)(Y-BTC).通过XRD对材料的物相进行表征,并采用紫外可见分光光度计研究了刚果红的初始浓度、吸附作用时间、溶液pH、背景离子和Y(BTC) (H2O)活化等因素对其吸附性能的影响.结果 表明,Y(BTC)(H2O)对刚果红的吸附量随着刚果红初始浓度的增加而逐渐增大,并且酸性溶液和活化有利于Y(BTC)(H2O)对刚果红的吸附.K+、Na+、Li+3种背景离子的存在不利于Y(BTC) (H2O)对刚果红溶液的吸附,这是由于它们会与刚果红抢占Y(BTC)(H2O)上的吸附位点,并占据Y(BTC)(H2O)孔道而减少Y(BTC) (H2O)与刚果红的接触机会.Y(BTC)(H2O)对刚果红的吸附过程符合Freundlich等温吸附模型和准二级动力学模型.