Hierarchical CC/PANI/Fe(EDTA)x architectures: stable visible-light photocatalysts with synergistic carrier enhancement for sustainable Cr(VI) reduction

IF 3.5 3区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Research on Chemical Intermediates Pub Date : 2025-09-26 DOI:10.1007/s11164-025-05751-w

Fenghua Chen, Xianghai Rao, Qingtao Chen, Xiaoyun Qin, Jiong Li, Zhiheng Li, Binyan Zou, Xiangdong Shi

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Abstract

Solar photocatalysis offers a sustainable solution for chromium-laden wastewater remediation. Herein, we constructed a hierarchical CC/PANI/Fe(EDTA)_x photocatalyst through in situ growth of one-dimensional PANI nanoarrays doped with Fe(EDTA)_x on activated carbon cloth (CC) for the enhanced photocatalytic reduction of Cr(VI) based on the synergistic PANI/Fe(EDTA)_x interactions. The experimental results indicated that the doping of Fe(EDTA)_x onto the surface of CC/PANI facilitated directional charge migration and reduced the recombination efficiency of photogenerated carriers. In addition, EDTA and FeSO₄ concentrations significantly influenced activity, where optimal coordination minimized Fe leaching and maximized electron transfer. The optimized CC/PANI/Fe(EDTA)_x sample (CPFeE-5) achieved exceptional photocatalytic performance with 98.65% Cr(VI) removal within 80 min of visible light exposure. It was also suggested that lower pH (pH = 2) favored Cr(VI) reduction, yielding a rate constant 12.08 times and 21.15 times higher than at pH = 4 and pH = 6, respectively. Moreover, stability tests revealed an efficiency retention of 81.20% after five cycles, with straightforward separation achieved and structural integrity maintained, as evidenced by XRD and SEM analysis. All of these findings revealed that a stable supported photocatalyst platform through synergistic carrier engineering was established in this work, demonstrating practical potential for solar-driven wastewater detoxification.

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分层CC/PANI/Fe(EDTA)x结构：具有增效载体增强的稳定可见光催化剂，用于Cr（VI）的可持续还原

太阳能光催化为含铬废水的修复提供了一种可持续的解决方案。在此，我们通过在活性炭布（CC）上原位生长掺杂Fe(EDTA)x的一维PANI纳米阵列，构建了层次化的CC/PANI/Fe(EDTA)x光催化剂，基于PANI/Fe(EDTA)x的协同作用，增强了Cr（VI）的光催化还原。实验结果表明，Fe(EDTA)x在CC/PANI表面的掺杂促进了定向电荷的迁移，降低了光生载流子的复合效率。此外，EDTA和FeSO4浓度显著影响活性，其中最佳配位使Fe浸出最小化，使电子转移最大化。优化后的CC/PANI/Fe(EDTA)x样品（cpfe -5）在可见光照射80 min内脱除Cr(VI) 98.65%，具有优异的光催化性能。较低的pH （pH = 2）有利于Cr（VI）的还原，其还原速率常数分别是pH = 4和pH = 6时的12.08倍和21.15倍。稳定性测试表明，经过5次循环后，其效率保持率为81.20%，且分离简单，结构完整。所有这些发现表明，本研究通过协同载体工程建立了一个稳定的负载光催化剂平台，展示了太阳能驱动废水解毒的实际潜力。

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来源期刊

Research on Chemical Intermediates 化学-化学综合

CiteScore

5.70

自引率

18.20%

发文量

229

审稿时长

2.6 months

期刊介绍： Research on Chemical Intermediates publishes current research articles and concise dynamic reviews on the properties, structures and reactivities of intermediate species in all the various domains of chemistry. The journal also contains articles in related disciplines such as spectroscopy, molecular biology and biochemistry, atmospheric and environmental sciences, catalysis, photochemistry and photophysics. In addition, special issues dedicated to specific topics in the field are regularly published.