Synthesis of lignin-based covalent organic frameworks bio-composites: Quantitative evaluation of adsorption-photoreduction of hexavalent chromium

IF 5.3 2区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY Arabian Journal of Chemistry Pub Date : 2024-08-23 DOI:10.1016/j.arabjc.2024.105980

Huiying Hu, Kaijian Bi, Haizhong Yu, Pengjiao Tian, Xiqing Wang

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Abstract

A novel bio-covalent organic framework (COF: TpPa-SO₃H/Lignin) based on TpPa-SO₃H and lignin from lignocellulose was synthesized for chromium (Cr(VI)) remediation in this study. Results showed that TpPa-SO₃H/Lignin had a highest adsorption capacity at the range of 5 ∼ 75 mg/L Cr(VI) under 10 mg/L dosage, in which 100 % Cr(VI) could be removal within 120 min. Likewise, the introduction of lignin improved the visible light response range, charge separation and photogenerated carriers, thereby improving the photocatalytic efficiency of Cr(VI) by TpPa-SO₃H/Lignin. The highest photocatalytic efficiency of TpPa-SO₃H/Lignin (98.56 %) was observed at the acidic conditions. ESR result shows that e- and ·O₂^– are generated and played an important role during the photocatalytic reaction, while the contribution of ·OH to Cr(VI) photoreduction is negligible. This study presents a sustainable and efficient approach to mitigating Cr(VI) pollution. It opens up avenues for further exploration of lignocellulose-derived materials in environmental applications and highlights the potential of COFs in addressing heavy metal contaminants.

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木质素基共价有机框架生物复合材料的合成：六价铬吸附-光诱导定量评估

本研究以 TpPa-SO3H 和木质纤维素中的木质素为基础，合成了一种新型生物共价有机框架（COF：TpPa-SO3H/木质素），用于铬（Cr(VI)）的修复。结果表明，在 10 mg/L 的添加量下，TpPa-SO3H/木质素在 5 ∼ 75 mg/L Cr(VI) 的范围内具有最高的吸附能力，在 120 分钟内可去除 100 % 的 Cr(VI)。同样，木质素的引入改善了可见光响应范围、电荷分离和光生载流子，从而提高了 TpPa-SO3H/L 木质素对六价铬的光催化效率。在酸性条件下，TpPa-SO3H/木质素的光催化效率最高（98.56%）。ESR 结果表明，在光催化反应过程中产生了 e- 和 -O2-，并发挥了重要作用，而 -OH 对 Cr(VI) 光还原的贡献微乎其微。这项研究为减轻六价铬污染提供了一种可持续的高效方法。它为进一步探索木质纤维素衍生材料在环境中的应用开辟了道路，并凸显了 COFs 在解决重金属污染物方面的潜力。

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来源期刊

Arabian Journal of Chemistry CHEMISTRY, MULTIDISCIPLINARY-

CiteScore

10.80

自引率

3.30%

发文量

763

审稿时长

63 days

期刊介绍： The Arabian Journal of Chemistry is an English language, peer-reviewed scholarly publication in the area of chemistry. The Arabian Journal of Chemistry publishes original papers, reviews and short reports on, but not limited to: inorganic, physical, organic, analytical and biochemistry. The Arabian Journal of Chemistry is issued by the Arab Union of Chemists and is published by King Saud University together with the Saudi Chemical Society in collaboration with Elsevier and is edited by an international group of eminent researchers.