TCN-TiO2/Zn(CH3COO)2-ACF复合材料吸附耦合光催化降解烷烃类VOCs性能研究

摘要/Abstract

摘要： 采用Zn(CH₃COO)₂通过超声-真空浸渍法对活性碳纤维（ACF）进行改性，通过水热横向热剥离法制备了管状氮化碳(TCN)，并将其与TiO2复合并负载于改性ACF上制备成TCN-TiO₂/Zn(CH₃COO)₂-ACF复合材料。应用扫描电子显微镜、透射电子显微镜、X射线衍射、N2吸附-脱附、X射线光电子能谱、傅里叶变换红外光谱、紫外-可见分光光谱、光致发光光谱、光电流响应曲线对复合材料进行表征，并对复合材料催化正己烷降解的机理与降解率进行了研究。结果表明：光照条件下，TCN质量分数为4%的复合材料对正己烷的降解效果最好，其最佳的制备条件为负载2次、450 ℃下煅烧。采用此条件下所制复合光催化剂，在体积空速为1 000 h^-1的条件下，质量浓度为200 mg/m³的正己烷气体降解率可达到87.9%。采用Zn(CH₃COO)₂对ACF进行改性，使ACF吸附能力得到增强；TCN与TiO₂复合形成异质结，降低了电子-空穴复合率，从而提高复合光催化剂的吸附耦合光催化效率。

关键词: 管状氮化碳, 二氧化钛, 醋酸锌, 改性, 活性炭纤维, 吸附耦合光催化, 正己烷

Abstract: The tubular carbon nitride (TCN) was prepared by hydrothermal lateral thermal stripping method, the ACF was successfully modified with Zn(CH₃COO)₂ by ultrasonic-vacuum impregnation method, TCN-TiO₂/Zn(CH₃COO)₂-ACF composites were prepared by loading TiO2 onto modified ACF. The composites were characterized by SEM, TEM, XRD, BET, XPS, FT-IR, UV-vis, PL, and I-T photocurrent response, and the degradation mechanism and degradation efficiency of n-hexane were studied. The results showed that the degradation effect of n-hexane was best when the mass fraction of TCN was 4% under light conditions, and the optimum preparation conditions were calcination at 450 ℃after loading twice. Under these conditions, the degradation rate of n-hexane gas with concentration of 200 mg/m³ at a space velocity of 1 000 h^-1 could reach 87.9%.When ACF was modified by Zn(CH₃COO)₂, the adsorption capacity of ACF was enhanced, the heterojunction of TCN and TiO₂ was formed, and the recombination rate of electron-hole was reduced.Thus, the adsorption-coupling photocatalytic efficiency of the composite photocatalyst could be improved.

Key words: TCN, TiO₂, Zn(CH₃COO)₂, modified, ACF, adsorption coupled photocatalysis, n-hexane

孙恩呈赵金刚王艺璇纪国洋刘芳赵朝成. TCN-TiO₂/Zn(CH₃COO)₂-ACF复合材料吸附耦合光催化降解烷烃类VOCs性能研究[J]. 石油炼制与化工, 2023, 54(4): 114-124.

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TCN-TiO₂/Zn(CH₃COO)₂-ACF复合材料吸附耦合光催化降解烷烃类VOCs性能研究

ADSORPTION-COUPLED PHOTOCATALYTIC DEGRADATION OF ALKANE VOCs BY TCN-TiO₂/Zn(CH₃COO)₂-ACF COMPOSITES

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