The unconventional air pollutants AsH3 is mainly derived from non-ferrous metal smelting, phosphorus chemical industry, coal chemical industry, petroleum processing and refining industry. The specific toxicity of AsH3 poses serious threat to human health and ecological safety. At the beginning of the 20th century, the removal of AsH3 was rarely studied at home and abroad. In recent decades, due to the acceleration of human industrialization process, increasing researches on the toxic properties, migration, transformation and removal mechanism of AsH3 have been carried out by scholars. Considering the strong reducibility of AsH3, the early removal method mainly focus on oxidizing solution absorption method, which is still employed in China today. Subsequently, direct combustion and catalytic decomposition have been developed in succession. Nevertheless, defects like large energy consumption, complex process and so forth are still existed in these methods. Researchers are figuring out a more appropriate method for AsH3removal. Compared with some traditional adsorbents with irregular structure and lower surface area, the modified adsorbents show great superiority in three aspects. Ⅰ.They exhibit high efficiency and low cost in removing AsH3 by chemical adsorption, catalytic oxidation and many other ways. Ⅱ. They present high selectivity in adsorbing target pollutants. Ⅲ. The reaction products of AsH3 and the adsorbents can be stably adsorbed on modified adsorbents, and secondary pollution will be avoided. Currently, activated carbon, mesoporous alumina and diverse molecular sieves have been successfully applied as carrier materials for highly effective adsorbents. The research and application of copper based activated carbon is the earliest. Palladium based mesoporous alumina show the strongest antitoxic stability among the modified adsorbent. Graphene, which has been recognized as the "revolutionary material" in the 21st century, is also modified and applied to the removal of AsH3. In recent study, bimetal synergism and carrier optimization have been introduced in the preparation of modified adsorbents to realize the crystal structure regularization and surface chemical activity optimization of the modified adsorbents, which is possible to make a breakthrough in promoting the removal efficiency of AsH3again. In addition to studying the action mechanism and the removal performance of modified adsorbent, researchers have made continuous attempts to select suitable active components and carrier materials for the adsorbents preparation, and fruitful results have been achieved. The industrial adaptability of the modified adsorbents is greatly improved, while taking full advantages of the efficient removal capacity. Several modified adsorbents have been adopted to the purification of AsH3 in industrial waste gas currently. In this paper, the main industrial sources of AsH3 and its migration and transformation process are summarized. The research progress and industrial application of AsH3 removal from industrial waste gases by adsorption methods are reviewed. It is pointed out that although the removal of AsH3 by adsorption is feasible and can provide a new idea for the efficient removal of AsH3, there are still some problems like the lack of experience in the industrial application of adsorbent and insufficiency of relative research. As increasing attention has been paid to the environmental problems caused by the pollution of AsH3, some more efficient, economical and environmentally friendly modified adsorbents will become the research focus, which own broad industrial application prospect. © 2018, Materials Review Magazine. All right reserved.
