Department of Civil and Environmental Engineering, Hanyang University, Seoul, 04673, Republic of Korea.
Department of Civil and Environmental Engineering, Hanyang University, Seoul, 04673, Republic of Korea.
Chemosphere. 2024 Nov;367:143638. doi: 10.1016/j.chemosphere.2024.143638. Epub 2024 Oct 30.
The practical utility of activated carbon/titanium dioxide (AC/TiO) 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/TiO composites (ACT-x: x as the theoretical mass ratio (in percent) of AC over TiO 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 for ACT-10 relative to 0.01 mg g for ACT-0. The ACT-5, with 3.6% C, exhibits the maximum photocatalytic removal efficiency (X = 93.77%), quantum efficiency (QE; 1.63 × 10 molecules photon), space time yield (STY; 1.99 × 10 molecules photon mg), and specific clear air delivery rate (SCADR; 686.2 L h g) 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 TiO-based photocatalysts. Accordingly, the ACT composite is recommended as a promising medium for the abatement of aromatic VOCs in indoor air.
活性炭/二氧化钛（AC/TiO）复合材料在消除常见芳香挥发性有机化合物（VOC）甲苯方面的实际应用已经得到了研究。通过填充流管反应器，在不同操作条件（例如，相对湿度和气体污染物组成）下，单独评估了制备的 AC/TiO 复合材料（ACT-x：x 为 AC 与 TiO 的理论质量比（以百分比计），范围从 0%到 10%）对气态甲苯的吸附和光催化性能。复合材料中存在 AC 可显著提高吸附容量（Q），例如 ACT-10 的 Q 为 1.71 mg g，而 ACT-0 的 Q 为 0.01 mg g。在所有测试的 ACT 成分中，含 3.6% C 的 ACT-5 表现出最大的光催化去除效率（X = 93.77%）、量子效率（QE；1.63×10 个分子光子）、时空产率（STY；1.99×10 个分子光子 mg）和特定清洁空气输送率（SCADR；686.2 L h g）。ACT-5 表现出增强的吸附和原位降解-解吸潜力，有利于减少副产物的生成，从而去除 VOC。原位漫反射红外傅里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，包括苄醇、苯甲醛、苯甲酸、苯酚和烷烃。此外，ACT 的光催化性能被证明优于其他 TiO 基光催化剂。因此，推荐 ACT 复合材料作为一种有前途的室内空气芳香 VOC 消除介质。
