Hydrogen sulfide has serious harm to human health and equipment safety. Spent Fenton-like reagent poses a challenge to the environment. In this article, a cost-effective adsorbent was prepared from rice straw biochar modified with spent Fenton-like reagent, and was used to remove gaseous hydrogen sulfide. Effects of several parameters and gas components on hydrogen sulfide adsorption, and hydrogen sulfide adsorption mechanism were studied. Results show that spent Fenton-like reagent modification promotes the rise of active sites on biochar surface, but results in the decline of adsorbent specific surface area. The optimum calcination temperature of adsorbent is 300 °C, and the maximum adsorption capacity for hydrogen sulfide is up to 1000.6 mg/g at 120 °C, which is far more than similar adsorbents. Presence of gas components such as sulfur dioxide, nitric oxide or water vapor inhibits the desulfurization performance of adsorbent to varying degrees. Copper oxide is confirmed to be the key active substance for hydrogen sulfide adsorption on adsorbent, and copper sulphide, cuprous sulfide and elemental sulfur are found to be the main products of hydrogen sulfide removal on adsorbent. The study provides new ideas for utilization of spent Fenton-like reagent and development of cost-effective hydrogen sulfide adsorbent.

硫化氢对人体健康和设备安全有严重危害。用过的类芬顿试​​剂对环境构成挑战。本文采用废类芬顿试剂改性稻草生物炭制备了一种经济高效的吸附剂，用于去除气态硫化氢。研究了几种参数和气体组分对硫化氢吸附的影响，以及硫化氢的吸附机理。结果表明，用过的类芬顿试​​剂改性促进了生物炭表面活性位点的增加，但导致吸附剂比表面积下降。吸附剂的最佳煅烧温度为300 ℃，120 ℃时对硫化氢的最大吸附量可达1000.6 mg/g，远远超过同类吸附剂。存在二氧化硫等气体成分，一氧化氮或水蒸气不同程度地抑制吸附剂的脱硫性能。氧化铜被证实是吸附剂吸附硫化氢的关键活性物质，硫化铜、硫化亚铜和元素硫是吸附剂脱除硫化氢的主要产物。该研究为废类芬顿试剂的利用和开发具有成本效益的硫化氢吸附剂提供了新思路。