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

LIU Zhuannian; LIU Wei; LIAO Sheng

doi:10.13205/j.hjgc.202506013

Volume 43 Issue 6

Jun. 2025

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LIU Zhuannian, LIU Wei, LIAO Sheng. Preparation of rGO/Fe（0） composite material and its adsorption mechanism for Cr（Ⅵ）[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(6): 127-137. doi: 10.13205/j.hjgc.202506013

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LIU Zhuannian, LIU Wei, LIAO Sheng. Preparation of rGO/Fe（0） composite material and its adsorption mechanism for Cr（Ⅵ）[J]. ENVIRONMENTAL ENGINEERING , 2025, 43(6): 127-137. doi: 10.13205/j.hjgc.202506013

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

doi: 10.13205/j.hjgc.202506013

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

Received Date: 2024-01-24
Accepted Date: 2025-03-20
Rev Recd Date: 2025-03-05

Abstract

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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References(50)

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