Surface engineering with polydopamine coatings has been considered a promising surface functionalisation tool.However,it is difficult to control the self-polymerisation for polydopamine formation,which usually causes ...Surface engineering with polydopamine coatings has been considered a promising surface functionalisation tool.However,it is difficult to control the self-polymerisation for polydopamine formation,which usually causes severe interparticle aggregation.In this study,polydopamine self-polymerisation was controlled by adjusting its reducing environment using a reductant(NaBH4)to fabricate mixed cellulose ester(MCE)/polydopamine membranes.An oxidising environment using NaIO4 was additionally tested as the control.The results showed that a thin polydopamine coating with small polydopamine particles was formed on the skeleton frameworks of the MCE membrane with NaBH4,and the self-polymerisation rate was suppressed.The polydopamine coating formed in the reducing environment facilitated excellent water transport performance with a water permeance of approximately 400 L·m^(−2)·h^(−1)·bar^(−1) as well as efficient organic foulant removal with a bovine serum albumin rejection of approximately 90%.In addition,the polydopamine coating with NaBH4 exhibited both excellent chemical stability and anti-microbial activity,demonstrating the contribution of the reducing environment to the performance of the MCE/polydopamine membranes.It shows significant potential for use in water purification.展开更多
More technologies are urgently needed for combined use to effectively eliminate the effect of oil spills,an environmental problem of widespread concern.Among these technologies,sorption methods are available to remove...More technologies are urgently needed for combined use to effectively eliminate the effect of oil spills,an environmental problem of widespread concern.Among these technologies,sorption methods are available to remove residual oil and prevent the further spread on the water surface.In this study,biochars,prepared from different feed-stock materials and pyrolysis temperatures,were screened and further modified to improve their application in the water environment.Among cornstalk biochar(CSBC),corncob biochar(CCBC),Sophora sawdust biochar(SSBC),and rice husk biochar(RHBC),the CSBC had excellent oil sorption capacity,especially prepared at 350℃(CSBC350),which has a complete and full pore structure.Furthermore,magnetic and silane agent modifications of CSBC350(OMBC)were performed to enhance the properties of the magnetic field controllability and hydrophobicity to increase oil sorption.The OMBC exhibited satisfactory oil sorption capacities to crude oil,diesel oil,and engine oil in the water-oil system of 8.77 g g^(−1),4.01 g g^(−1),and 4.44 g g^(−1),respectively.The sorption process of CSBC350 and OMBC complied with the pseudo-second-order kinetics(R^(2)>0.97)and the Langmuir isotherm models(R^(2)>0.80)based on the highest regression coefficients.The sorption mechanisms are dominated by hydrophobic forces,pore intercepts,and hydrogenbond interactions.The biochar adsorbent can availably cooperate with other physical methods to eliminate oil contaminants,which can be an outstanding fuel source for producing heat.展开更多
基金This work was supported by the National Natural Science Foundation of China(Grant No.21878279)Fundamental Research funds for the Central Universities(No.201841012)Natural science fund of Shandong Province Project(No.ZR2018MB032)。
文摘Surface engineering with polydopamine coatings has been considered a promising surface functionalisation tool.However,it is difficult to control the self-polymerisation for polydopamine formation,which usually causes severe interparticle aggregation.In this study,polydopamine self-polymerisation was controlled by adjusting its reducing environment using a reductant(NaBH4)to fabricate mixed cellulose ester(MCE)/polydopamine membranes.An oxidising environment using NaIO4 was additionally tested as the control.The results showed that a thin polydopamine coating with small polydopamine particles was formed on the skeleton frameworks of the MCE membrane with NaBH4,and the self-polymerisation rate was suppressed.The polydopamine coating formed in the reducing environment facilitated excellent water transport performance with a water permeance of approximately 400 L·m^(−2)·h^(−1)·bar^(−1) as well as efficient organic foulant removal with a bovine serum albumin rejection of approximately 90%.In addition,the polydopamine coating with NaBH4 exhibited both excellent chemical stability and anti-microbial activity,demonstrating the contribution of the reducing environment to the performance of the MCE/polydopamine membranes.It shows significant potential for use in water purification.
基金MCTL Contribution No.307,and it is supported by the Major Scientific and Technological Innovation Project(MSTIP)of Shandong(2021CXGC010705).
文摘More technologies are urgently needed for combined use to effectively eliminate the effect of oil spills,an environmental problem of widespread concern.Among these technologies,sorption methods are available to remove residual oil and prevent the further spread on the water surface.In this study,biochars,prepared from different feed-stock materials and pyrolysis temperatures,were screened and further modified to improve their application in the water environment.Among cornstalk biochar(CSBC),corncob biochar(CCBC),Sophora sawdust biochar(SSBC),and rice husk biochar(RHBC),the CSBC had excellent oil sorption capacity,especially prepared at 350℃(CSBC350),which has a complete and full pore structure.Furthermore,magnetic and silane agent modifications of CSBC350(OMBC)were performed to enhance the properties of the magnetic field controllability and hydrophobicity to increase oil sorption.The OMBC exhibited satisfactory oil sorption capacities to crude oil,diesel oil,and engine oil in the water-oil system of 8.77 g g^(−1),4.01 g g^(−1),and 4.44 g g^(−1),respectively.The sorption process of CSBC350 and OMBC complied with the pseudo-second-order kinetics(R^(2)>0.97)and the Langmuir isotherm models(R^(2)>0.80)based on the highest regression coefficients.The sorption mechanisms are dominated by hydrophobic forces,pore intercepts,and hydrogenbond interactions.The biochar adsorbent can availably cooperate with other physical methods to eliminate oil contaminants,which can be an outstanding fuel source for producing heat.
