文献类型：期刊文献

英文题名：Enhanced removal capacities and mechanisms of Mn/Fe-loaded biochar composites functionalized with chitosan Schiff-base or hydroxyl toward Pb (II) and Cd(II) from aqueous solutions

作者：Wang, Hai[1];Xia, Haixin[1];Chen, Qian[1];Liu, Renrong[1];Zhang, Yaohong[1]

机构：[1]Shaoxing Univ, Sch Life & Environm Sci, Sch Chem & Chem Engn, Zhejiang Key Lab Alternat Technol Fine Chem Proc, Shaoxing 312000, Zhejiang, Peoples R China

年份：2023

卷号：11

期号：5

外文期刊名：JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING

收录：SCI-EXPANDED(收录号：WOS:001089070800001)、、EI(收录号：20234114849491)、Scopus(收录号：2-s2.0-85173559338)、WOS

基金：Financial supported from the Joint Funds of the Zhejiang Provincial Natural Science Foundation of China under Grant No. LZY21C030001, National Natural Science Foundation of China under Grant No. 31500321 and Open Funds of Zhejiang Key Laboratory of Alternative Technologies for Fine Chemicals Process (jxhxpctgytdjs2305) are acknowledged.

语种：英文

外文关键词：Biochar; Mn-Fe composites; Pb(II) and Cd(II) removal; Schiff base; Hydroxylation

外文摘要：The efficient capture of heavy metal ions from actual wastewater is a global challenge. To enhance Pb(II) and Cd (II) removal, novel biochar composites (MF@CBC, MF-S@CBC and MF-OH@CBC) were successfully fabricated by loading magnetic Mn-Fe binary oxides and functionalizing chitosan Schiff-base or hydroxyl on biochar in the study. The maximum adsorption capacities of MF-OH@CBC and MF-S@CBC toward Pb(II)/Cd(II) were 196.69/ 187.29 mg/g and 161.61/153.69 mg/g (pH = 5.0, adsorbent dosage = 0.5 g/L), which were 2.09/3.05 and 1.54/ 2.33 times higher than corn cob biochar (CBC), respectively. The adsorption processes were conformed to Langmuir isothermal model and pseudo second order model. The numerous functional groups presented on MF-OH@CBC resulting from loading Mn-Fe nanoparticle and hydroxylation might be the main reason for dominating adsorption of Pb(II)/Cd(II) by complex interaction (contribution rate (CR) = 45.66%/43.12%). And also, the negative charge on MF-OH@CBC might be another reason for enhancing adsorption of Pb(II)/Cd(II) by elec-trostatic interaction (CR = 23.11%/22.45%). Besides, ion exchange (CR = 17.95%/19.33%) and physical adsorption (CR = 13.28%/15.10%) could also contributed to Pb(II)/Cd(II) removal. In addition, MF-OH@CBC displayed favorable recycling ability and its adsorption capacity retained over 80% after five cycles. It also exhibited anti-interfering ability, the adsorption capacity for Pb(II)/Cd(II) in actual sewage was 85.27%/80.47%, respectively. The results indicated that MF-OH@CBC possessed good potential for eliminating Pb(II) and Cd(II) from the complex aqueous environment.