In this study, a green and efficient ultrasound-assisted alkali-acid synergistic strategy was developed for the high-yield extraction of cellulose from tea residue, combined with a recyclable aminosulfonic acid recovery system to achieve green and low-carbon production. Orthogonal experiments were conducted using a NaOH-H2O2 system (4

This study reports the synthesis and characterization of two novel porous chitosan-based hydrogels with carboxyl functionalization, aimed at efficient cationic dye removal from aqueous solutions. BET and Nano-measurer analysis revealed that CMAP@PVA exhibited a higher micropore proportion and larger pore size, while thermogravimetric analysis demonstrated excellent thermal stability for both hydrogels. Adsorption experiments showed that CMAP@PVA achieved maximum removal efficiencies of 97.62% for methylene blue (MB), 96.67% for malachite green (MG), 98.12% for crystal violet (CV), and 99.32% for basic fuchsin (BF). Correspondingly, CMIP@PVA achieved 98.74%, 95.49%, 95.55%, and 98.42% for these dyes. Zeta potential and adsorption data indicate preferential removal of cationic dyes via electrostatic interactions, with additional contributions from hydrogen bonding and n-pi interactions. Even in the presence of interfering ions, the hydrogels maintained strong adsorption for CV and BF, indicating good ion tolerance. Kinetic and isotherm studies revealed that the adsorption process followed the pseudo-second-order model and conformed well to the Langmuir isotherm, suggesting chemisorption and monolayer adsorption behavior. Notably, both hydrogels retained > 80% adsorption capacity after 5 cycles. This carboxyl-functionalized hydrogel strategy offers a sustainable, efficient platform for treating dye-laden wastewater.

This research presents the effective preparation of a novel dual network chitosan-based hydrogel (CMAPP) for the adsorption of methylene blue (MB), malachite green (MG), crystalline violet (CV), and basic fuchsin (BF) using the sol-gel method to address the escalating issue of dye pollution. FTIR, XRD, SEM, EDS, XPS, TGA, and zeta potential study examined hydrogel production and physicochemical properties. To ascertain the maximum adsorption capacity, the influences of pH, temperature, initial dye concentration, contact time, and adsorbent dosage on adsorption were systematically analyzed. It was observed that CMAPP demonstrated significant removal efficiencies (97.62%, 96.67%, 98.12%, and 99.32%) for the dyes MB, MG, CV, and BF at a concentration of 500 mg/L under optimal conditions. The findings from the adsorption kinetics and isotherm studies indicated that pseudo-second-order kinetics and the Langmuir model were the most appropriate for characterizing the adsorption process of hydrogels. The thermodynamic findings demonstrated that the adsorption process was exothermic and spontaneous. After five cycles of adsorption, the hydrogel demonstrated a consistent dye removal efficiency of around 80%, indicating commendable recyclability. In the interference studies, CMAPP exhibits superior anti-interference capability against CV and BF, which is advantageous for its practical application. The findings from XPS and FTIR investigations indicate that electrostatic attraction, hydrogen bonding, and n-π interactions are the primary forces between the adsorbent and the dyes. The synthesis of CMAPP offers an innovative approach for the effective elimination of cationic dyes and demonstrates significant potential in the treatment of complicated wastewater.

Amino acid (AA) was used as a green grafting agent to functionalize polyepoxysuccinic acid (PESA), and three AA-modified PESA (AA-PESA) CaCO3 scale inhibitors were obtained to change the structural singleness of PESA and further improve its comprehensive properties. The structures of AA-PESA were characterized by FTIR and (HNMR)-H-1. The molecular weights of AA-PESA were analyzed by GPC. The synthesis technology of AA-PESA was optimized by single-factor and orthogonal experiments. The CaCO3 scale inhibition performance of AA-PESA was studied by static-scale inhibition method, and the scale inhibition mechanism was analyzed. Results showed that AA-PESAs had the same synthesis process: n(PESA):n(AA)=1:0.625, reaction temperature of 95 degrees C, and reaction time of 2 h. In the water system with pH 7.0-8.5, agent concentration of 8-10 mg/L, action period of 10-14 h, ambient temperature < 80 degrees C, and rho(Ca2(+))< 250 mg/L, the inhibition rate of three AA-PESAs on CaCO3 could reach 100%, and GIN preferred for the graft modification of PESA. FTIR, XRD, and SEM results showed that the addition of AA-PESA could control the nucleation sites of CaCO3 crystal, had important influence on the growth of calcite (104) crystal planes, and had a good inhibitory effect on the CaCO3 scale.

In this study, HMSNs with a specific surface area of 900 m2 g-1 and a wall thickness of 50 nm were prepared by a soft template method. A cavity structure with a diameter of about 150 nm was constructed between the core and shell, and it had a mesoporous structure of 4.0 nm. Therefore, the core and shell particles have an ideal carrying capacity as a corrosion inhibitor carrier. Amino modified HMSNs and grafted ferrocene group to obtain FcHMSNs. Impregnation method and negative pressure method were used to load acidizing corrosion inhibitor, and nano-valves sensitive to REDOX potential and pH were used to block the mesopores of HMSNs. The acidizing inhibitor (DR-HMSNs@S-AFA) was completely encapsulated in micro/nano containers. The controlled release performance of DR-HMSNs@S-AFA acidizing inhibitor was studied. The results showed that the acidizing inhibitor with DR-HMSNs@S-AFA load could achieve rapid release under strong acidic conditions or a certain concentration of H2O2.

以苯甲酰乙酸乙酯(EBA)为改性试剂,对聚天冬氨酸(PASP)进行功能化修饰,得到了一种新型阻垢剂EBA-PASP;再以其为主剂,通过正交实验,得到了一种高效缓蚀配方.采用静态沉积法分析了EBA-PASP的应用范围,采用旋转挂片法研究了改性产品及其配方对A3碳钢的缓蚀性能.结果表明,在药剂浓度为8～10mg·L-1、使用时间小于10h、温度小于80℃、Ca2+浓度小于250mg·L-1的水体系中,EBA-PASP对CaCO3的抑制性能可达100％.当总加药量为39mg·L-1、HEDP:EBA-PASP:ZnSO4:Na2MoO4(摩尔比)=5:4:17:13时,配方对A3碳钢的年腐蚀率为0.018978mm·a-1,可满足工业需求.采用IR和1HNMR等手段证明EBA基团已成功接枝,采用XRD、SEM等剖析了药剂对CaCO3晶型的微观调控过程,发现调控过程以晶格畸变为主.用宏观分析法和SEM研究了配方组分之间协同效应的作用机理,即形成了一种特殊的吸附-沉淀-钝化复合膜,从而阻止了金属腐蚀.

Abstract C34H36CoN4O5, triclinic, P1̅ (no. 2), a = 8.7040(5) Å, b = 12.7375(9) Å, c = 14.2626(9) Å, α = 99.054(2)°, β = 95.727(2)°, γ = 92.477(2)° V = 1550.96(17) Å3, Z = 2, R gt(F) = 0.0554, wR ref(F 2) = 0.1369, T = 296(2) K.

以水为溶剂,在氢氧化钠的催化下,以β-二羰基化合物为绿色接枝剂,利用其活性亚甲基对中间体聚琥珀酰亚胺(PSI)进行开环改性,合成了3种β-二羰基化合物改性聚天冬氨酸(β-PASP)阻垢剂.采用FTIR对β-PASP进行了结构表征,通过正交实验优化了PSI的合成条件,根据优化条件评价了β-PASP的阻垢缓蚀性能.结果表明,β-PASP的最佳合成工艺为:n(PSI):n(β-二羰基化合物):n(NaOH)=1:0.6:6,反应时间18～24 h,反应温度35℃,原料质量分数15％.与PASP相比,3种β-PASP具有更好的螯合分散性,在药剂质量浓度为8～10 mg/L时,对碳酸钙的阻垢率均可达到100％.同时,β-PASP对A3碳钢的缓蚀效果也好于PASP,在加药量为5 mg/L时,其对A3碳钢的缓蚀效果最好.

C34H36CoN4O5, triclinic, P1̅ (no. 2), a = 8.7040(5) Å, b = 12.7375(9) Å, c = 14.2626(9) Å, α = 99.054(2)°, β = 95.727(2)°, γ = 92.477(2)° V = 1550.96(17) Å3, Z = 2, Rgt(F) = 0.0554, wRref(F2) = 0.1369, T = 296(2) K.

Ni(Ⅱ)离子对Salamo型配合物的荧光增强或淬灭等效应与配体及配合物的结构有关.为了研究其构效关系,首先制备了一种新的非对称Salamo类配体H2L(H2L=5-甲氧基-5′-(N,N-二乙胺基)-2,2′-[乙二氧双(氮次甲基)]二酚),其次培养出了其Ni(Ⅱ)配合物单晶体,用X-射线衍射方法测定其结构为[Ni3(L)2(OAc)2(H2O)2],并通过化学元素分析、紫外-可见、红外、荧光光谱和分子模拟等方法对配体及其同三核Ni(Ⅱ)配合物进行了有关结构与性质表征.研究表明:配体H2 L的亚胺基氮原子、酚羟基氧原子与Ni(Ⅱ)离子有较强的配位作用,其荧光增强或淬灭机理为光诱导电子转移(PET).

A hetero-trinuclear CoII2-DyIII complex, [Co2L(DMF)2Dy(NO3)3]·C2H5O2 was synthesized via the reaction of a multi-naphthol-based bis(Salamo)-like tetraoxime H4L with Co(OAc)2·4H2O and Dy(NO3)3·6H2O, and fully characterized via elemental analyses, X-ray crystallography, FT-IR and UV-Vis spectra. In addition, luminescence properties of H4L and its CoII2-DyIII complex have also been investigated.

Heterobinuclear 3d-4f complexes having chemical formulae [Cu(L)Nd(NO3)(3)(C2H5OH)] (1) and [Zn(L) (OAc)Ce(NO3)(2)(CH3OH)] (2) with a Salamo-type ligand O,O'-(ethane-1,2-diyl)bis (1-(3-ethoxy-2-hydroxyphenyl)-3-ethoxy-2-hydroxybenzaldehyde oxime) (H2L)were synthesized, and characterized by elemental analyses, IR, UV-Vis, fluorescence spectra and X-ray crystallography. Complex 1 is an asymmetrical dinuclear complex, the pentacoordinate Cu(II) ion has a slightly distorted square pyramidal geometry, and deca-coordinated Nd(III) ion possesses a distorted bicapped twelve surface geometry. Complex 2 is also an asymmetrical dinuclear complex, the penta-coordinate Zn(II) ion bears a distorted square pyramidal geometry too, and deca-coordinated Ce(III) ion adopts a distorted bicapped twelve surface geometry. Compared with the ligand H2L, complex 1 showed fluorescence quenching, while complex 2 exhibited the fluorescence enhancement when the excitation wavelength is 318 nm. CCDC: 1815944, 1; 1815943, 2.

Heterobinuclear 3d-4f complexes having chemical formulae [Cu(L)Nd(NO3)3(C2H5OH)] (1) and [Zn(L)(OAc)Ce(NO3)2(CH3OH)] (2) with a Salamo-type ligand O,O'-(ethane-l,2-diyl)bis(1-(3-ethoxy-2-hydroxyphenyl)-3-ethoxy-2-hydroxybenzaldehyde oxime) (H2L)were synthesized,and characterized by elemental analyses,IR,UV-Vis,fluorescence spectra and X-ray crystallography.Complex 1 is an asymmetrical dinuclear complex,the pentacoordinate Cu(Ⅱ) ion has a slightly distorted square pyramidal geometry,and deca-coordinated Nd(Ⅲ) ion possesses a distorted bicapped twelve surface geometry.Complex 2 is also an asymmetrical dinuclear complex,the penta-coordinate Zn(Ⅱ) ion bears a distorted square pyramidal geometry too,and deca-coordinated Ce(Ⅲ) ion adopts a distorted bicapped twelve surface geometry.Compared with the ligand H2L,complex 1 showed fluorescence quenching,while complex 2 exhibited the fluorescence enhancement when the excitation wavelength is 318 nm.CCDC:1815944,1;1815943,2.

Two Zn(II) complexes, [Zn-3(L)(OAc)(2)(H2O)] (1) and [Zn-3(L)(OAc)(2)(H2O)] center dot [Zn-3(L)(OAc)(2)(CH3OH)(H2O)] center dot 3CH(3)OH center dot H2O (2) have been synthesized via the complexation of zinc(II) acetate dihydrate with a bis(salamo)-type tetraoxime ligand H4L (H4L =6,6'-diethoxy-bis (2,2'-(ethylenedioxybis (nitrilomethylidyne)))tetraphenol). X-ray crystallographic analyses reveal formation of trinuclear structures consisting of two salamo-type L4- ligands and three Zn(II) atoms as expected from the analytical data. Two of the three Zn(II) atoms are located in the salamo-type L4- chelate moieties. The,cc-phenoxo oxygen atoms of the [Zn(L)] chelates further coordinate to centre Zn(II) atom. The trinuclear structure is probably stabilized by the mu-acetato ligands, which neutralize the whole charge of the complexes 1 and 2. There are two kinds of coordination geometries (trigonal bipyramidal and square pyramidal or trigonal bipyramidal and octahedral geometries) in complexes 1 and 2. In addition, complexes 1 and 2 exhibit strong green emission lambda(max)=531 and 536 nm when excited with 340 and 337 nm, respectively. CCDC: 864890, 1; 1470489, 2.

C44H49Cl2Co3N6O12, Triclinic, P1̅, a = 9.7415(9) Å, b = 13.6440(14) Å, c = 17.5241(11) Å, α = 72.807(10)°, β = 83.019(9)°, γ = 72.246(9)°, V = 2450.6(5) Å3, Z = 2, Rgt(F) = 0.0700, wRref(F2) = 0.1505, T = 291(2) K.

Abstract C44H49Cl2Co3N6O12, Triclinic, P1̅, a = 9.7415(9) Å, b = 13.6440(14) Å, c = 17.5241(11) Å, α = 72.807(10)°, β = 83.019(9)°, γ = 72.246(9)°, V = 2450.6(5) Å3, Z = 2, R gt(F) = 0.0700, wR ref(F 2) = 0.1505, T = 291(2) K.

C15H13NO3, monoclinic, P21/c (no. 14) a = 7.5158(6) Å, b = 6.3940(5) Å, c = 25.881(3) Å, β = 93.243(8)°, Z = 4, V = 1241.74(19) Å3, Rgt(F) = 0.0547, wRref(F2) = 0.1582, T = 173 K.

The survey results of environmental awareness showed that it was conductive to cultivate high-quality chemical talents if we gave environmental classes to those non-environmental chemical specialty university students. From the Curriculum Provision, teaching methods, etc., it was proved that it was necessary that environmental chemistry courses of the curriculum carried out environmental education and establish environment classes teaching system of non-environmental chemical specialty to develop more and more high-quality chemical talents with idea of sustainable development.

Based on the environmental awareness investigation and the result analysis to currently enrolled chemical specialty university students in certain university and different situation of having environmental optional courses or not , it was necessary to strengthen environmental education to chemical specialty university students and the importance to make the environmental classes into professional compulsory course of non -environmental chemical specialty.Results from the environmental awareness showed that giving the environmental professional classes to non -environmental chemical specialty university students was beneficial to the cultivation of chemical high -quality talents , who had the environmental awareness of sustainable development.More importantly, the students should make rational decisions that people should have harmonious relationships with the nature in their future work and life , and carry forward the ways of environment.