活性炭对VOCs的吸附研究进展

Volatile organic compounds (VOCs) such as hydrocarbon compounds and aromatic compounds have been recognized as one of the major environmental pollutants. Owing to their toxic and carcinogenic nature, most VOCs harm the environment with ozone sphere damage and threaten human health and lead to irreversible damage after high-concentration exposure. Therefore, industries and research communities face great challenges to effectively remove VOCs by developing practical environment remediation tools and technologies. Several technologies have been investigated, including destructive recovery technologies and recoverable technologies. Compared to other destructive recovery technologies, adsorption is established as one of the most promising strategies for VOCs abatement thanks to its characteristics of cost-effectiveness, simplicity, and low energy consumption. The core of the adsorption technology is the adsorbent. Activated carbon (AC) is considered an excellent adsorbent due to its developed pore structure, high surface area, and a high degree of surface reactivity. However, the structural and surface chemical properties of AC can be quite complicated, which have important effects on the adsorption capacity, selectivity and application in the humid environments. Therefore, the adsorption and desorption mechanism of AC for VOCs is introduced in this work, concerning the effect of diffe-rent modification methods (physical modification, chemical modification, etc.) on the adsorption capacity and selectivity AC, the regeneration methods of AC after adsorption saturation are summarized carefully. This overview provides a comprehensive understanding of VOCs adsorption, desorption, and regeneration mechanisms and up-to-date progress of modification technologies for AC.