文献类型：期刊文献

英文题名：Performance of selenate removal by biochar embedded nano zero-valent iron and the biological toxicity to: Escherichia coli

作者：Liang, Liping[1,2]; Xue, Yuanyuan[1]; Tian, Gangliang[2]; Mao, Qiaole[2]; Lou, Zixuan[2]; Wu, Qian[1]; Wang, Qian[1]; Du, Juanshan[3]; Meng, Xu[4]

机构：[1] School of Civil Engineering, Shaoxing University, Shaoxing, 312000, China; [2] College of Life Science, Shaoxing University, Shaoxing, 312000, China; [3] State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, China; [4] College of Textile and Garment, Shaoxing University, Shaoxing, 312000, China

年份：2019

卷号：9

期号：45

起止页码：26136

外文期刊名：RSC Advances

收录：EI(收录号：20193607405659)、Scopus(收录号：2-s2.0-85071733135)

语种：英文

外文关键词：Escherichia coli - Iron - Proteins - Toxicity

外文摘要：The application of nano zero-valent iron (nZVI) in water environment was limited by its easily aggregation and potential biological toxicity. In this study, biochar embedded nZVI (BC-nZVI) was prepared by carbon-thermal reduction method, and the SEM-EDX mapping results showed that nZVI was successfully embedded on biochar. Meanwhile, BC-nZVI with the optimal Fe/C of 2/1 showed a similar Se(vi) removal efficiency to pure nZVI. Effects of pH, BC-nZVI loading, and initial Se(vi) concentration were studied. Se(vi) removal rates (at 30 min) by BC-nZVI at pH 4.0 and 5.0 were 98.2% and 95.9%, respectively. But Se(vi) removal rate (at 30 min) was sharply decreased to 25.8% at pH 6.0. With the increase of BC-nZVI loading from 0.5 g L-1 to 1 g L-1, Se(vi) removal rate (at 30 min) significantly increased from 25.5% to 95.9%. And the continuous increase of BC-nZVI loading to 2 g L-1 did not improve Se(vi) removal rate. Se(vi) less than 3 mg L-1 was completely removed by BC-nZVI in 30 min, but Se(vi) more than 6 mg L-1 only was removed about 25.9% at 30 min. Optimal parameters were pH 4.0, 2 g L-1 BC-nZVI, and 1.5 mg L-1 Se(vi). Variation of calculated amount, SOD activity, and protein content of Escherichia coli with nZVI and BC-nZVI indicated that nZVI and BC-nZVI both produced negative effects on the growth of E. coli. But the amount and SOD activity of E. coli with pure nZVI was lower than that with BC-nZVI. Moreover, E. coli with nZVI released more protein than that with BC-nZVI. So modified nZVI by biochar was less harmful to E. coli than nZVI. This journal is ? The Royal Society of Chemistry.