Influence of crystal structure of polymorphic cotton cellulose on the adsorption and photocatalysis properties of biochar-TiO2 composites

IF 4.9 2区工程技术 Q1 MATERIALS SCIENCE, PAPER & WOOD Cellulose Pub Date : 2024-09-14 DOI:10.1007/s10570-024-06156-5

Yueyue Song, Hui Zhang, Yaning Zhang, Wenming Li, Xiangtao Xuan, Jiale Yao

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Abstract

Cellulose derived biochar can be used for adsorbent and photocatalyst mainly because of its good compatibility, high hydrophilicity, and the large amount of electron-rich hydroxy groups. Nevertheless, the impact of the crystal structure of cellulose on the absorption and photocatalytic efficiency of biochar-based composites derived from cellulose remains uncertain. Herein, four different types of biochar derived from cotton (cellulose I_β, II, III, and IV) were individually impregnated with a TiO₂ catalyst through hydrothermal and pyrolysis processes, and were analyzed using various characterization methods. Their adsorption behavior and photocatalytic activities were compared using Congo red and methylene blue dye as the model. The analysis and test outcomes suggested that the crystal structure of cotton cellulose impacted the pore structure and TiO₂ content of biochar-TiO₂ composites to different degrees, resulting in variations in the adsorption and photocatalytic capabilities of biochar-TiO₂ composites. In comparison with cellulose II, III and IV, cellulose I derived biochar-TiO₂ composite had a large specific surface area, a more stable structure, a high aromatic carbon content, and a high TiO₂ loading, resulting in the strong adsorption ability and superior photoactivity to organic dyes. The adsorption and photocatalysis mechanisms were also clarified.

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多晶体棉纤维素的晶体结构对生物炭-二氧化钛复合材料的吸附和光催化性能的影响

纤维素衍生生物炭可用于吸附剂和光催化剂，主要是因为其具有良好的相容性、高亲水性和大量富电子羟基。然而，纤维素的晶体结构对纤维素衍生的生物炭基复合材料的吸附和光催化效率的影响仍不确定。本文通过水热法和热解法将四种不同类型的棉花生物炭（纤维素 Iβ、II、III 和 IV）分别浸渍到 TiO2 催化剂中，并使用各种表征方法对其进行了分析。以刚果红和亚甲基蓝染料为模型，比较了它们的吸附行为和光催化活性。分析和试验结果表明，棉纤维素的晶体结构对生物炭-TiO2 复合材料的孔隙结构和 TiO2 含量有不同程度的影响，从而导致生物炭-TiO2 复合材料的吸附和光催化能力存在差异。与纤维素 II、III 和 IV 相比，纤维素 I 衍生的生物炭-TiO2 复合材料具有较大的比表面积、更稳定的结构、较高的芳香碳含量和较高的 TiO2 负载，因而对有机染料具有较强的吸附能力和优异的光活性。同时还阐明了吸附和光催化机理。

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来源期刊

Cellulose 工程技术-材料科学：纺织

CiteScore

10.10

自引率

10.50%

发文量

580

审稿时长

3-8 weeks

期刊介绍： Cellulose is an international journal devoted to the dissemination of research and scientific and technological progress in the field of cellulose and related naturally occurring polymers. The journal is concerned with the pure and applied science of cellulose and related materials, and also with the development of relevant new technologies. This includes the chemistry, biochemistry, physics and materials science of cellulose and its sources, including wood and other biomass resources, and their derivatives. Coverage extends to the conversion of these polymers and resources into manufactured goods, such as pulp, paper, textiles, and manufactured as well natural fibers, and to the chemistry of materials used in their processing. Cellulose publishes review articles, research papers, and technical notes.