Facile synthesis of activated carbon/titanium dioxide composite and its application for adsorptive/photocatalytic removal of gaseous toluene

IF 8.1 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Chemosphere Pub Date : 2024-11-01 DOI:10.1016/j.chemosphere.2024.143638
Yang Sun, Younes Ahmadi, Ki-Hyun Kim
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Abstract

The practical utility of activated carbon/titanium dioxide (AC/TiO2) composite has been investigated for the abatement of a common aromatic volatile organic compound (VOC), toluene. The adsorption and photocatalytic performance of the prepared AC/TiO2 composites (ACT-x: x as the theoretical mass ratio (in percent) of AC over TiO2 ranging from 0% to 10%) is evaluated individually against gaseous toluene using a packed flow tube reactor under varying operational conditions (e.g., relative humidity and gaseous pollutant composition). The presence of AC in the composite significantly increases the adsorption capacity (Q) such as 1.71 mg g−1 for ACT-10 relative to 0.01 mg g−1 for ACT-0. The ACT-5, with 3.6% C, exhibits the maximum photocatalytic removal efficiency (XT = 93.77%), quantum efficiency (QE; 1.63 × 10−4 molecules photon−1), space time yield (STY; 1.99 × 10−5 molecules photon−1 mg−1), and specific clear air delivery rate (SCADR; 686.2 L h−1 g−1) among all the ACT compositions tested. ACT-5 exhibits enhanced potential for adsorption and in-situ degradation-desorption to facilitate the removal of VOCs with the reduced yield of by-products. The in-situ diffuse reflectance infrared Fourier transform spectroscopy and gas chromatography-mass spectrometry analyses indicate the formation of several intermediate by-products during the photocatalytic degradation process, including benzyl alcohol, benzaldehyde, benzoic acid, phenol, and alkane species. In addition, the photocatalytic performance of ACT is demonstrated to be superior to those of other TiO2-based photocatalysts. Accordingly, the ACT composite is recommended as a promising medium for the abatement of aromatic VOCs in indoor air.

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活性炭/二氧化钛复合材料的简便合成及其在气态甲苯吸附/光催化去除中的应用
研究了活性炭/二氧化钛(AC/TiO2)复合材料在减少常见芳香族挥发性有机化合物(VOC)甲苯方面的实用性。在不同的操作条件(如相对湿度和气态污染物成分)下,使用填料流管反应器对所制备的活性炭/二氧化钛复合材料(ACT-x:x 为活性炭相对于二氧化钛的理论质量比(百分比),从 0% 到 10% 不等)对气态甲苯的吸附和光催化性能进行了单独评估。复合材料中 AC 的存在大大提高了吸附容量(Q),例如 ACT-10 的吸附容量为 1.71 mg g-1,而 ACT-0 为 0.01 mg g-1。ACT-5 的 C 含量为 3.6%,在所有测试的 ACT 成分中,其光催化去除效率(XT = 93.77%)、量子效率(QE;1.63 × 10-4 分子光子-1)、时空产率(STY;1.99 × 10-5 分子光子-1 毫克-1)和特定净空气输送率(SCADR;686.2 升/小时-1 克-1)均为最高。ACT-5 显示出更强的吸附和原位降解-解吸潜力,有助于去除挥发性有机化合物,同时减少副产品的产量。原位漫反射红外傅立叶变换光谱和气相色谱-质谱分析表明,在光催化降解过程中形成了几种中间副产物,包括苯甲醇、苯甲醛、苯甲酸、苯酚和烷烃类。此外,ACT 的光催化性能还优于其他基于二氧化钛的光催化剂。因此,建议将 ACT 复合材料作为一种有前途的媒介,用于减少室内空气中的芳香族挥发性有机化合物。
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来源期刊
Chemosphere
Chemosphere 环境科学-环境科学
CiteScore
15.80
自引率
8.00%
发文量
4975
审稿时长
3.4 months
期刊介绍: Chemosphere, being an international multidisciplinary journal, is dedicated to publishing original communications and review articles on chemicals in the environment. The scope covers a wide range of topics, including the identification, quantification, behavior, fate, toxicology, treatment, and remediation of chemicals in the bio-, hydro-, litho-, and atmosphere, ensuring the broad dissemination of research in this field.
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