Waste adsorbents generated from treating Cr(VI)-containing wastewater are hazardous materials and generally landfilled or treated by acid or base desorption, with concomitant high cost and toxic effects. The present work shows that these Cr adsorbents can be reused as highly efficient catalysts for treating sulfur-containing VOCs (CH₃SH), not only avoiding the economic and environmental impact from the conventional approaches, but also achieving the efficient treatment of sulfur-containing waste gas. Importantly, these reused Cr adsorbents exhibit enhanced activity and stability compared with the catalysts reported elsewhere, indicating a new avenue of green chemistry. The highly toxic adsorbed Cr(VI) species are reduced to a Cr₂O₃ crystalline phase by calcination and finally immobilized as a Cr₂S₃ solid phase while converting and eliminating CH₃SH. Still, the presence of Cr(VI) species on the reused Cr adsorbent provides enough reactive sites for reaction, but high concentration of Cr(VI) species causes serious accumulation of coke deposit on the catalyst, leading to fast deactivation of the catalyst.

中文翻译：

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回收废铬吸附剂作为消除甲基硫醇的催化剂

处理含六价铬的废水产生的废吸附剂是有害物质，通常被填埋或通过酸或碱脱附处理，同时伴随着高成本和毒性作用。目前的工作表明，这些Cr吸附剂可以作为处理含硫VOCs（CH ₃ SH）的高效催化剂而重复使用，不仅避免了常规方法的经济和环境影响，而且还实现了含硫量的有效处理。废气。重要的是，与其他地方报道的催化剂相比，这些重复使用的Cr吸附剂表现出增强的活性和稳定性，这表明绿色化学的新途径。高毒性吸附的Cr（VI）物种被还原为Cr ₂ O ₃通过煅烧形成结晶相，最后固定为Cr ₂ S ₃固相，同时转化并消除CH ₃ SH。尽管如此，在重复使用的Cr吸附剂上Cr（VI）物种的存在为反应提供了足够的反应性位点，但是高浓度的Cr（VI）物种会导致催化剂上焦炭沉积严重积聚，从而导致催化剂快速失活。