The synergistic effect of ‘reactive adsorption and catalytic oxidation (RACO)’ has been investigated to develop an efficient method to remove volatile organic compounds (VOCs: formaldehyde (FA) + toluene) using an amorphous-manganese dioxide-activated carbon (Am-MnO-AC) composite. The RACO of FA and toluene onto Am-MnO-AC was examined individually and as a mixture at multiple-isothermal conditions from room temperature (RT) to 300 °C. At RT, the values for 10% adsorption breakthrough volume (BTV10%) of single FA and toluene by Am-MnO-AC were 45.9 and 152 L g, respectively, approx. 1.3-fold higher than those for their mixture. The BTV10% values for FA measured in single and mixture were 270–280 times higher than their pristine AC counterparts. The RACO performance of Am-MnO-AC was investigated more intensively against a dual component system in reference to its crystalline forms (e.g., δ-MnO) and two other metal-doped forms (i.e., cobalt and silver). Accordingly, Am-MnO-AC exhibited the highest catalytic reactivity so as to achieve the complete oxidation of FA and toluene (as individual components) into carbon dioxide (CO) at 100 and 275 °C, respectively. The thermal catalytic oxidation of FA and toluene onto Am-MnO-AC was suggested to follow the Langmuir-Hinshelwood mechanism. The enhanced RACO performance of Am-MnO-AC was ascribed to its higher surface porosity and higher concentration of oxygen vacancies (e.g., Mn/Mn of 0.707 and adsorbed oxygen (O)/lattice oxygen (O) of 1.79). The present study is expected to provide deep insights into the practical application of metal oxide/AC composites for cleaner indoor air quality.

中文翻译：

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金属氧化物/活性炭复合材料用于空气中甲醛和甲苯的反应吸附和催化氧化

研究了“反应吸附和催化氧化 (RACO)”的协同效应，开发了一种使用无定形二氧化锰活性炭 (Am-MnO) 去除挥发性有机化合物（VOC：甲醛 (FA) + 甲苯）的有效方法-AC) 复合材料。在室温 (RT) 至 300 °C 的多重等温条件下，分别检查了 FA 和甲苯在 Am-MnO-AC 上的 RACO，并作为混合物进行了检查。在室温下，Am-MnO-AC 对单一 FA 和甲苯的 10% 吸附突破体积 (BTV10%) 值分别为 45.9 L g 和 152 L g，大约为 10%。比其混合物高 1.3 倍。单一和混合物中测得的 FA 的 BTV10% 值比原始 AC 同类产品高 270-280 倍。 Am-MnO-AC 的 RACO 性能针对双组分系统，参考其晶型（例如，δ-MnO）和其他两种金属掺杂形式（即，钴和银）进行了更深入的研究。因此，Am-MnO-AC表现出最高的催化反应活性，从而分别在100和275℃下实现FA和甲苯（作为单独组分）完全氧化成二氧化碳（CO）。 FA 和甲苯在 Am-MnO-AC 上的热催化氧化被认为遵循 Langmuir-Hinshelwood 机制。 Am-MnO-AC 增强的 RACO 性能归因于其较高的表面孔隙率和较高的氧空位浓度（例如，Mn/Mn 为 0.707，吸附氧 (O)/晶格氧 (O) 为 1.79）。本研究预计将为金属氧化物/活性炭复合材料在清洁室内空气质量方面的实际应用提供深入的见解。