文献类型：期刊文献

英文题名：Adsorption and reduction of Cr(VI) from aqueous solution using cost-effective caffeic acid functionalized corn starch

作者：Liu, Fenglei[1];Hua, Shan[1];Wang, Chao[2];Qiu, Muqing[1];Jin, Limin[1];Hu, Baowei[1]

机构：[1]Shaoxing Univ, Sch Life Sci, Huancheng West Rd 508, Shaoxing 312000, Peoples R China;[2]Tsinghua Univ, Sch Environm, Beijing 100084, Peoples R China

年份：2021

卷号：279

外文期刊名：CHEMOSPHERE

收录：SCI-EXPANDED(收录号：WOS:000659971200063)、、EI(收录号：20211510213579)、Scopus(收录号：2-s2.0-85103938522)、WOS

基金：We gratefully thank the Research Fund Program of National Natural Science Foundation of China (No. 21876115), Zhejiang Public Welfare Technology Application and Social Development Project (LGF21C030001), Zhejiang Provincial Natural Science Foundation of China (LGF21C030001).

语种：英文

外文关键词：Caffeic acid; Corn starch; Cr ions; Adsorption; Reduction

外文摘要：Herein, a potential bio-adsorbent (DACS-CA) was formed via immobilizing caffeic acid (CA) on dialdehyde corn starch (DACS) for Cr(VI) removal. The characterization techniques such as IR, Raman, XPS and C-13 NMR were performed to analyze surface elements and functional groups on the as-prepared sorbents. Batch experiments revealed that the maximum Cr(VI) removal amount (96.45 mg/g) took place at a pH value of 3.0, adsorption temperatures of 333 K and solid-liquid ratio of 0.2. The isotherms studies found that the Cr(VI) removal of DACS-CA was monolayer adsorption, while the kinetics analysis revealed that chemisorption was the main power for removal process. Characterization analysis found that about Cr(VI) (53.02%) and Cr(III) (46.98%) species co-existed onto the surface of DACS-CA, which implied that a redox reaction may be occurred between Cr(VI) and the bio-adsorbent. Namely, Cr(VI) was first loaded on DACS-CA via electrostatic interaction, subsequently Cr(VI) was partially transformed into Cr(III) by reductive functional groups, meanwhile the resulting Cr(III) was immobilized by the carboxyl groups of DACS-CA. Thus, this bio-adsorbent could serve as an efficient sorbent for the removal of Cr(VI) from wastewater in environmental pollution cleanup. (C) 2021 Elsevier Ltd. All rights reserved.