期刊
CHEMOSPHERE
卷 279, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2021.130539
关键词
Caffeic acid; Corn starch; Cr ions; Adsorption; Reduction
资金
- Research Fund Program of National Natural Science Foundation of China [21876115]
- Zhejiang Public Welfare Technology Application and Social Development Project [LGF21C030001]
- Zhejiang Provincial Natural Science Foundation of China [LGF21C030001]
A bio-adsorbent DACS-CA was developed by immobilizing caffeic acid on dialdehyde corn starch for efficient removal of Cr(VI) from wastewater. Characterization analysis indicated a redox reaction between Cr(VI) and the bio-adsorbent, where Cr(VI) was initially loaded via electrostatic interaction, partially converted into Cr(III), and then immobilized on DACS-CA's carboxyl groups.
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据