Xin Yaqing, Li Caihong, Liu Jianing, Liu Jinrong, Liu Yuchen, He Weiyan, Gao Yanfang
College of Chemical Engineering, Inner Mongolia University of Technology, Hohhot 010051, People's Republic of China.
Zhongtian Synergetic Energy Co. Ltd., Ordos 017317, People's Republic of China.
R Soc Open Sci. 2018 Sep 19;5(9):180532. doi: 10.1098/rsos.180532. eCollection 2018 Sep.
The objectives of this study were to remove heavy metals from wastewater through the biosorption method with modified biomass as an effective sorbent and to prepare metal/biomass composites with the same modified biomass as a direct template. Eggshell membrane (ESM) was selected and modified to adsorb heavy metals. Adsorption of metal ions on the modified ESM (MESM) might be attributed to electrostatic interaction, ion exchange and coordination effect with chelating ligands containing N and S on the surface of the MESM. The pH of the solution was a key factor affecting the adsorption. The Cu-Ag/MESM composites with uniform Cu-Ag NPs were prepared with MESM as matrices, and with Cu and Ag adsorbed as metal sources. The Cu-Ag/MESM showed excellent catalytic performance in the reduction of 4-nitrophenol to 4-aminophenol in the aqueous phase. Because of the high stability of the Cu-Ag NPs supported on the macro-dimension supporter, Cu-Ag/MESM can be easily separated after the catalytic reaction and recycled.
本研究的目的是通过以改性生物质作为有效吸附剂的生物吸附法从废水中去除重金属，并以相同的改性生物质作为直接模板制备金属/生物质复合材料。选择蛋壳膜（ESM）并对其进行改性以吸附重金属。金属离子在改性ESM（MESM）上的吸附可能归因于静电相互作用、离子交换以及与MESM表面含N和S的螯合配体的配位作用。溶液的pH值是影响吸附的关键因素。以MESM为基质，以吸附的Cu和Ag作为金属源，制备了具有均匀Cu-Ag纳米颗粒的Cu-Ag/MESM复合材料。Cu-Ag/MESM在水相中将4-硝基苯酚还原为4-氨基苯酚的反应中表现出优异的催化性能。由于负载在宏观尺寸载体上的Cu-Ag纳米颗粒具有高稳定性，Cu-Ag/MESM在催化反应后易于分离并可循环使用。
