Efficient Removal of Acid Orange 7 by Activating Persulfate Using Paper Sludge Biochar: Singlet Oxygen-Dominated Mechanism

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters Pub Date : 2024-11-16 DOI:10.1007/s10562-024-04863-z

Hongtao Zhang, Shuhan Cai, Zehong Hu, Wang Qin, Fengtao Chen, Xin Zhang

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Abstract

Excess sludge in the paper industry is a hazardous solid waste that requires urgent and proper disposal for environmental protection and resource utilization. In this study, a novel magnetic biochar (Fe-SDBC) synthesized from paper sludge through one-step pyrolysis was employed to activate persulfate (PDS) for the efficient removal of acid orange 7 (AO7). The results indicated that Fe-SDBC could effectively activate PDS to remove 97.8% of AO7 within 90 min, with 89.4% removed within 5 min. Fe-SDBC had unique properties with abundant adsorption and active sites, including iron-containing compounds and oxygen-containing functional groups. The addition concentrations of Fe-SDBC (0.5 g/L) and PDS (10 mM) were optimized based on response surface methodology. Furthermore, Fe-SDBC presented good stability over a wide range of pH (3 ~ 11) and reusability in cyclic experiments. Coexisting ions, such as CO₃²⁻, HCO₃⁻, and PO₄³⁻, had an inhibitory effect on AO7 removal. Both radical and non-radical pathways were proved to be involved in the Fe-SDBC/PDS system for AO7 removal, with singlet oxygen (¹O₂) being the dominant species. Additionally, the degradation pathways were investigated and toxicity assessment was evaluated. This work will provide a potential approach for paper sludge recycling in the wastewater treatment.

Graphical Abstract

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利用造纸污泥生物炭活化过硫酸盐高效去除酸性橙 7：单线态氧主导机制

造纸工业中的过剩污泥是一种危险固体废物，急需妥善处置，以保护环境和资源利用。本研究利用造纸污泥通过一步热解合成的新型磁性生物炭（Fe-SDBC）来活化过硫酸盐（PDS），从而高效去除酸性橙 7（AO7）。结果表明，Fe-SDBC 能在 90 分钟内有效活化 PDS，去除 97.8% 的酸性橙 7，其中 89.4% 的酸性橙 7 在 5 分钟内被去除。Fe-SDBC具有独特的性质，具有丰富的吸附和活性位点，包括含铁化合物和含氧官能团。根据响应面方法，Fe-SDBC（0.5 g/L）和 PDS（10 mM）的添加浓度得到了优化。此外，Fe-SDBC 在广泛的 pH 值（3 ~ 11）范围内具有良好的稳定性，并可在循环实验中重复使用。共存离子（如 CO32-、HCO3- 和 PO43-）对 AO7 的去除有抑制作用。事实证明，Fe-SDBC/PDS 系统在去除 AO7 的过程中涉及自由基和非自由基途径，其中单线态氧（1O2）是最主要的物种。此外，还研究了降解途径并评估了毒性。这项工作将为废水处理中造纸污泥的回收利用提供一种潜在的方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Catalysis Letters 化学-物理化学

CiteScore

5.70

自引率

3.60%

发文量

327

审稿时长

1 months

期刊介绍： Catalysis Letters aim is the rapid publication of outstanding and high-impact original research articles in catalysis. The scope of the journal covers a broad range of topics in all fields of both applied and theoretical catalysis, including heterogeneous, homogeneous and biocatalysis. The high-quality original research articles published in Catalysis Letters are subject to rigorous peer review. Accepted papers are published online first and subsequently in print issues. All contributions must include a graphical abstract. Manuscripts should be written in English and the responsibility lies with the authors to ensure that they are grammatically and linguistically correct. Authors for whom English is not the working language are encouraged to consider using a professional language-editing service before submitting their manuscripts.