文献类型：期刊文献

英文题名：Efficient removal of Cr(VI) by polydopamine-modified lignin from aqueous solution: Batch and XAFS studies

作者：Guo, Xiao-jie[1];Fu, Wei-kang[2];Ma, Jing-yuan[3];Xi, Bo-jun[2];Wang, Chen[1];Guan, Meng-yao[1]

机构：[1]Hangzhou Dianzi Univ, Coll Mat & Environm Engn, Hangzhou 310018, Peoples R China;[2]Shaoxing Univ, Coll Text & Garment, Shaoxing 312000, Peoples R China;[3]Chinese Acad Sci, Shanghai Adv Res Inst, Shanghai Synchrotron Radiat Facil, Shanghai 201204, Peoples R China

年份：2024

卷号：17

期号：1

起止页码：51

外文期刊名：WATER SCIENCE AND ENGINEERING

收录：EI(收录号：20234915153592)、ESCI(收录号：WOS:001168020400001)、Scopus(收录号：2-s2.0-85178102033)、WOS

基金：This work was supported by the Zhejiang Provincial Natural Science Foundation of China (Grant No. LQ19E030017) , the Research Start-up Fund (Grant No. KYS205619042) , and the Technological Research Project for Public Welfare of Zhejiang Province (Grant No. LGG19E030005) . *

语种：英文

外文关键词：Lignin; Polydopamine; Hexavalent chromium; EXAFS; Adsorption mechanism

外文摘要：Lignocellulose has the potential to become a bio-based adsorbent due to its biodegradability and renewability. In this study, a novel polydopaminefunctionalized-lignin (lignin@PDA), prepared via self -polymerization of dopamine (PDA) on lignin, was used as a bio-based adsorbent for rapid scavenging of hexavalent chromium (Cr(VI)). The morphology, functional groups, crystalline structure, and chemical composition of lignin@PDA were characterized with a scanning electron microscope -energy dispersive spectrometer, Fourier transform infrared spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The Cr(VI) adsorption process of lignin@PDA was studied using batch experiments as a function of pH, ionic strength, adsorbent dose, and contact time at room temperature. The adsorption rate of lignin@PDA was five times greater than that of the unmodified lignin, with a maximum adsorption capacity of 102.6 mg/g in an acidic medium. The adsorption of Cr(VI) on lignin@PDA fit the pseudo -secondorder equation and the Freundlich model, indicating that the adsorption process was mainly dominated by chemisorption and surface complexation. The thermodynamic parameters showed that adsorption of Cr(VI) on lignin@PDA was an endothermic and spontaneous process. The X-ray absorption fine structure results showed that sorption and reduction of Cr(VI) into Cr(III) occurred simultaneously on lignin. Moreover, PDA coating not only improved the reactivity of lignin but also promoted the complete reduction of Cr(VI) by lignin. According to these results, polydopaminefunctionalized-lignin is a promising bio-based adsorbent for immobilization of Cr(VI) from wastewater. (c) 2023 Hohai University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY -NC -ND license (http:// creativecommons.org/licenses/by-nc-nd/4.0/).