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]Shaoxing Univ, Sch Civil Engn, Shaoxing 312000, Peoples R China;[2]Shaoxing Univ, Coll Life Sci, Shaoxing 312000, Peoples R China;[3]Harbin Inst Technol, State Key Lab Urban Water Resource & Environm, Harbin 150090, Heilongjiang, Peoples R China;[4]Shaoxing Univ, Coll Text & Garment, Shaoxing 312000, Peoples R China

年份：2019

卷号：9

期号：45

起止页码：26136

外文期刊名：RSC ADVANCES

收录：SCI-EXPANDED(收录号：WOS:000483541000022)、、EI(收录号：20193607405659)、Scopus(收录号：2-s2.0-85071733135)、WOS

基金：The authors gratefully acknowledge the financial support of the National Natural Science Foundation of China (Grant No. 41807468), Zhejiang Provincial Natural Science Foundation of China (Grant No. LY18E080018), Shaoxing Public Welfare Project (Grant No. 2017B70042), and National innovation and entrepreneurship training program for college students (Grant No. 201810349008) and University students' science and technology innovation program of Zhejiang Province (Young Talents Program) (Grant No. 2018R432004).

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.