Novel Zn4In2S7 Loaded Mg/N Doped CQDs Composites with Improved Visible-Light Photocatalytic Properties for Depolymerization of Sodium Lignosulfonate

IF 2.3 4区化学 Q3 CHEMISTRY, PHYSICAL

Catalysis Letters Pub Date : 2025-01-02 DOI:10.1007/s10562-024-04899-1

Jinhai Hu, Guanhong He, Kai Zhang, Yilin Wu, Hong Yan

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Abstract

Photocatalysis purifies industrial paper wastewater by selectively breaking bonding bonds in lignin. To address the shortcomings of single photocatalysts such as narrow photoresponsive region, high photogenerated carrier complexation rate, and low photocatalytic activity. In this paper, Mg and N doped carbon quantum dots (Mg/N doped CQDs) were prepared by hydrothermal method. Then Zn₄In₂S₇ series catalysts with different loadings (0, 0.3, 0.6, 1.2 wt %) of Mg/N doped CQDs (denoted as ZIS 350 °C, ZIS-3 350 °C, ZIS-6 350 °C, ZIS-12 350 °C) were constructed based on condensation reflux and inert gas calcination method. The catalyst possesses highly efficient visible light-catalyzed depolymerization of sodium lignosulfonate (SLS), an industrial waste material. From the BET curve, the specific surface area of ZIS-6 350 °C was the largest. The composite of Mg/N doped CQDs reduced the band gap of Zn₄In₂S₇ while promoting the separation and transfer of photogenerated electrons/holes, as confirmed by DRS, Mott-Schottky, transient photocurrent and EIS analyses. From the photocatalytic activity test, the photocatalytic depolymerization of lignin by ZIS-6 350 °C was increased by 21.2% compared with that of ZIS 350 °C, and the reactions all follow the pseudo first order kinetic model. A possible photocatalytic mechanism was proposed based on the active species capture experiments.

Graphical Abstract

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新型Zn4In2S7负载Mg/N掺杂CQDs复合材料对木质素磺酸钠解聚的可见光催化性能改进

光催化通过选择性地破坏木质素中的键来净化工业造纸废水。针对单一光催化剂光响应区窄、光生载体络合速率高、光催化活性低等缺点。本文采用水热法制备了Mg/N掺杂碳量子点（Mg/N掺杂CQDs）。采用缩合回流和惰性气体煅烧法制备了Mg/N掺杂CQDs（分别为ZIS 350°C、ZIS-3 350°C、ZIS-6 350°C、ZIS-12 350°C）不同负载（0、0.3、0.6、1.2 wt %）的Zn4In2S7系列催化剂。该催化剂具有可见光催化木质素磺酸钠（SLS）解聚的高效性能。从BET曲线上看，350℃时ZIS-6的比表面积最大。通过DRS、Mott-Schottky、瞬态光电流和EIS分析证实，Mg/N掺杂CQDs的复合减小了Zn4In2S7的带隙，同时促进了光电子/空穴的分离和转移。从光催化活性测试来看，350℃ZIS-6对木质素的光催化解聚效果比350℃ZIS提高了21.2%，且反应均符合准一级动力学模型。基于活性物质捕获实验，提出了一种可能的光催化机理。图形抽象

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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.