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Janus membrane with enhanced interfacial activation for solar evaporation

Journal of Energy Chemistry 2023年第12期87卷 1-11,I0002页

作者： Hao Chen Guangze Pan Mei Yan Fang Wang Yadong Wu Chongshen Guo School of Chemistry and Chemical Engineering Harbin Institute of TechnologyHarbin 150001HeilongjiangChina Laboratory for Space Environment and Physical Sciences Harbin Institute of TechnologyHarbin 150001HeilongjiangChina

Low solar spectrum coverage,high evaporation enthalpy,and undesired salt deposition severely limited the solar-driven interfacial evaporation technology for further sewage purification and seawater *** overcome these problems,we designed an amphiphilic Janus-structured polyaniline(PANI)/ZrC/cellulose acetate(CA)(J-PZCA) ***,the interfacial interaction between PANI and ZrC enhances the photoabsorption and photothermal conversion ***,low thermal conductivity reduces the heat lost at the *** importantly,ZrC could facilitate interfacial activation,which weakens the intermolecular forces of water by affecting the hydrogen *** 1 solar irradiation(1 sun),the composite membrane exhibits a high evaporation rate of 1.31 kg m^(-2)h^(-1) and an excellent efficiency of 79.4%.In addition,the sewage purification and seawater desalination experiments reveal a remarkable purification capability of J-PZCA *** for the treatment of high-concentration salt solution,it realizes a long-term stable evaporation performance due to the excellent salt deposition ***,the J-PZCA membrane constructed in this study provides a new perspective for the design of efficient interfacial evaporation devices.

关键词： interfacial water evaporation Photothermal synergy interfacial activation ZrC PANI

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Conjugation of a zwitterionic polymer with dimethyl chains to lipase significantly increases the enzyme activity and stability

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Chinese Journal of Chemical Engineering 2022年第7期35卷 48-53页

作者： Chunyu Zhang Yan Sun Xiaoyan Dong Department of Biochemical Engineering School of Chemical Engineering and Technology and Key Laboratory of Systems Bioengineering and Frontiers Science Center for Synthetic Biology(Ministry of Education)Tianjin UniversityTianjin 300350China College of Life Sciences Yantai UniversityYantai 264005China

Enzyme-polymer conjugates are complex molecules with great practical *** work was designed to develop a novel enzyme-polymer conjugate by covalently coupling a zwitterionic polymer with side dimethyl chains(pID)to Candida rugosa lipase(CRL)via the reaction between the anhydrides of polymer chains with the amino groups of the *** resulting two CRL-pID conjugates with different pID grafting densities were investigated in term of the catalytic activity,stability and structural *** comparison with native CRL,both the CRL conjugates displayed 2.2 times higher activity than the native enzyme,and showed an increase in the maximum reaction rate(V_(max))and a decrease in the Michaelis constant(K_(m)),thus resulting in about three-fold increases in the catalytic efficiency(k_(cat)/K_(m)).These are mainly attributed to the activation of lipase by the hydrophobic alky side ***,the thermostability and pH tolerance of the lipase conjugates were significantly enhanced due to the stabilizing effect of the zwitterion *** instance,a five-fold increase of the enzyme half-life at 50℃ for the high-pID conjugated CRL was *** studies reveal that the pID conjugation protected the enzyme in the changes in its microenvironment and conformation,well correlating with enhanced activity and stability of lipase *** findings indicate that enzyme conjugation to the zwitterionic polymer is promising for improving enzyme performance and deserves further development.

关键词： Lipase Zwitterionic polymer Enzyme-polymer conjugate Stability interfacial activation

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Fabrication and characterization of epoxylated zwitterionic copolymergrafted silica nanoparticle as a new support for lipase immobilization

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Chinese Journal of Chemical Engineering 2020年第4期28卷 1129-1135页

作者： Ning Chen Chunyu Zhang Xiaoyan Dong Yan Sun Department of Biochemical Engineering and Key Laboratory of Systems Bioengineering(Ministry of Education) School of Chemical Engineering and TechnologyTianjin UniversityTianjin 300354China

Our previous work proved that the thermal stability of Candida rugosa lipase(CRL)immobilized on zwitterionic polymer(poly(carboxybetaine methacrylate))grafted silica nanoparticle(SNP)was much higher than that on poly(glycidyl methecrylate)(pGMA)grafted SNP,while the latter showed significantly increased *** by the research,we have herein proposed to synthesize copolymers of zwitterionic sulfobetaine methacrylate(SBMA)and GMA for CRL *** copolymers were grafted onto SNP surface at three GMA/SBMA(G/S)molar ratios(G100/S0,G50/S50,G10/S90),followed by the covalent coupling of CRL to the surface *** immobilized CRLs on the corresponding supports were denoted as p(G100-S0)-CRL,p(G50-S50)-CRL and p(G10-S90)-*** enzyme loading increased with the increase of GMA content in the copolymer,while the activity varied with the grafted copolymer *** study proved the improvement of enzyme-substrate affinity after *** comparison to p(G100-S0)-CRL,p(G50-S50)-CRL and p(G10-S90)-CRL presented remarkably enhanced thermal stability and pH tolerance,and p(G10-S90)-CRL showed the highest *** results suggest that the copolymer design is promising for development as a versatile platform for enzyme immobilization.

关键词： Lipase Immobilization Zwitterionic copolymer interfacial activation Stabilization

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