化工新型材料

化工新型材料 ›› 2019, Vol. 47 ›› Issue (4) : 200-203.

科学研究

铋系复合光催化剂的制备及其对双酚A光催化降解研究

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In-situ preparation of bismuth-based composite with enhanced photocatalytic activity for bisphenol A

Shan Wenjie¹, Zhang Ying²

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摘要

将氧化铋(Bi₂O₃)与三聚氰胺或盐酸胍混合煅烧,通过原位晶相合成法制备了界面紧密接触的碳三氮四复合碳酸氧铋(g-C₃N₄/Bi₂O₂CO₃)和碳三氮四复合氯氧化铋(g-C₃N₄/BiOCl)复合光催化剂。采用X射线衍射仪、扫描电子显微镜、紫外-可见漫反射光谱仪等分析手段对复合光催化剂的结构和性能进行了分析表征。结果表明:Bi₂O₂CO₃和BiOCl纳米片均是从g-C₃N₄体相中生长出来,从而导致铋系氧化物和g-C₃N₄界面间的紧密接触。紫外-可见漫反射光谱分析结果表明,g-C₃N₄/Bi₂O₂CO₃和g-C₃N₄/BiOCl复合光催化剂的可见光吸收能力均优于 g-C₃N₄和Bi₂O₃。在可见光照射下,复合光催化剂对双酚A表现出优越的降解性能。此外,探讨了复合光催化剂的光催化机理。由于g-C₃N₄和Bi₂O₂CO₃或BiOCl界面间的紧密接触导致了光生载流子的有效分离,从而提高了复合光催化剂的光催化活性。

Abstract

The g-C₃N₄/Bi₂O₂CO₃ and g-C₃N₄/BiOCl nanocomposites with intimately contacted interfaces were synthesized used in-situ crystal synthesis by mixing Bi₂O₃ nanoparticles with melamine or guanidine hydrochloride.The fabricated nanocomposites were well-characterized by various analytical techniques.The results showed that Bi₂O₂CO₃ and BiOCl nanosheets growed out from the g-C₃N₄ bulk,producing closely contacted interfaces between Bi oxide component and g-C₃N₄ component.UV-Vis diffuse reflectance spectra of g-C₃N₄/Bi₂O₂CO₃ and g-C₃N₄/BiOCl nanocomposites exhibited increased visible light absorption compared to g-C₃N₄ and Bi₂O₃ separately.Moreover,the nanocomposites showed significantly enhanced photocatalytic activity for the degradation of dibutyl phthalate and methyl orange under visible light.Moreover,a proposed photocatalytic mechanism for the enhanced photoactivity of nanocomposites was investigated.The increased photocatalytic activity was mainly attributed to the effective separation and transfer of photo-induced carriers in the intimate contact between g-C₃N₄ and Bi₂O₂CO₃ or BiOCl.The results showed that the different precursors of g-C₃N₄ had a significant effect on the composite's structure,i.e.,Bi₂O₃ can react to form different bismuth-based oxides depending on the different precursors used to generate g-C₃N₄.This work demonstrated a convenient way to fabricate visible light responsive materials with potential for environmental remediation.

关键词

碳三氮四 / 碳酸氧铋 / 氯氧化铋 / 纳米光催化剂

Key words

g-C₃N₄ / Bi₂O₂CO₃ / BiOCl / nano photocatalist

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铋系复合光催化剂的制备及其对双酚A光催化降解研究[J]. 化工新型材料, 2019, 47(4): 200-203 DOI:

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