rGO/Fe（0）复合材料的制备及其对Cr（Ⅵ）的吸附机理

刘转年; 刘威; 廖晟

doi:10.13205/j.hjgc.202506013

rGO/Fe（0）复合材料的制备及其对Cr（Ⅵ）的吸附机理

doi: 10.13205/j.hjgc.202506013

西安科技大学地质与环境学院, 西安 710054

基金项目:

陕西省重点研发计划项目（2022SF-578）；陕西省水利科技计划资助项目（2022slkj-5）

详细信息

作者简介:
刘转年（1968—），男，教授，研究方向为水处理材料与技术。zhuannianliu@163.com

通讯作者:
刘威（1995—），男，硕士，研究方向为水处理材料与技术。1732242444@qq.com

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出版历程
- 收稿日期: 2024-01-24
- 录用日期: 2025-03-20
- 修回日期: 2025-03-05

Preparation of rGO/Fe（0） composite material and its adsorption mechanism for Cr（Ⅵ）

College of Geology and Environment, Xi'an University of Science and Technology, Xi'an 710054, China

摘要

摘要: 采用硼氢化钠（NaBH₄）将氧化石墨烯（GO）与Fe（Ⅱ）还原制备rGO/Fe（0）复合材料，以Cr（Ⅵ）模拟废水为研究对象，采用SEM、XPS、FT-IR、XRD及BET表征技术对rGO/Fe（0）进行微观形貌和物化性质表征分析，结合吸附动力学、吸附热力学和吸附等温线等模型探究rGO/Fe（0）对Cr（Ⅵ）的吸附还原性能及机理。结果表明：rGO/Fe（0）相对rGO的比表面积（20.03 m²/g）提高了111.1%，孔容（0.08 cm³/g）提高了162.5%，孔径（16.45 nm）提高了21.7%。rGO/Fe（0）将Cr（Ⅵ）吸附还原成Cr（Ⅲ）后被rGO固定在表面，剩余的部分Cr（Ⅲ）扩散到溶液中。pH=3时，rGO/Fe（0）对Cr（Ⅵ）的去除量为28.75 mg/g，其中还原量为23.91 mg/g，溶液中的Cr（Ⅲ）为11.54 mg/L。rGO/Fe（0）去除Cr（Ⅵ）的主要机理为静电吸引、还原作用和络合作用。rGO/Fe（0）对Cr（Ⅵ）的去除率为57.5%，其中还原反应贡献率为83.2%，说明rGO/Fe（0）去除Cr（Ⅵ）的主要机理为还原反应，同时Fe（0）被氧化成Fe（Ⅱ）和Fe（Ⅲ）。循环利用结果表明，rGO/Fe（0）在循环4次后对Cr（Ⅵ）去除率降低17.6百分点。rGO/Fe（0）对实际Cr（Ⅵ）废水的去除率为79.5%。
- rGO/Fe（0） /
- Cr（Ⅵ） /
- 吸附还原 /
- 去除机理 /
- 循环利用
Abstract: In this paper，Graphene oxide （GO） was reduced with Fe（Ⅱ） using sodium borohydride （NaBH₄） to prepare rGO/Fe（0） composites. The rGO/Fe（0） composites were characterized using SEM， XPS， FT-IR， XRD， and BET characterization techniques. The adsorption kinetics， thermodynamics， and isotherm models were used to investigate the adsorption-reduction performance of rGO/Fe（0） on Cr（Ⅵ） and the mechanism. The adsorption-reduction performance of Cr（Ⅵ） by the rGO/Fe（0） composite was investigated by combining adsorption kinetics， thermodynamics， and isotherm models. The results showed that the specific surface area （20.03 m²/g） of rGO/Fe（0） increased by 111.1%， the pore volume （0.08 cm³/g） increased by 162.5%， and the pore size （16.45 nm） increased by 21.7% compared to that of rGO. The rGO/Fe（0） adsorbed and reduced Cr（Ⅵ） to Cr（Ⅲ）， which was immobilized on the surface by rGO， and the remaining portion of Cr（Ⅲ） diffused into solution. At pH=3， the removal of Cr（Ⅵ） by rGO/Fe（0） was 28.75 mg/g， of which 23.91 mg/g was reduced， and the Cr（Ⅲ） concentration in the solution was 11.54 mg/L. Electrostatic attraction， reduction and complexation are the main mechanisms of Cr（Ⅵ） removal by rGO/Fe（0）. The removal efficiency of Cr（Ⅵ） by rGO/Fe（0） was 57.5%， of which the contribution of the reduction reaction was 83.2%， indicating that the main mechanism of Cr（Ⅵ） removal by rGO/Fe（0） was the reduction reaction， while Fe（0） was oxidized to Fe（Ⅱ） and Fe（Ⅲ）. The recycling results showed a 17.6 percentage points reduction in Cr（Ⅵ） removal by rGO/Fe（0） after four reuse cycles. rGO/Fe（0） removed 79.5 % of Cr（Ⅵ） from the actual effluent.
- rGO/Fe（0） /
- Cr（Ⅵ） /
- adsorption-reduction /
- removal mechanism /
- recycling

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