College of Ecology, Hainan University, Haikou 570228, China.
School of Chemistry and Chemical Engineering, Hainan University, Haikou 570228, China; Key Laboratory of Solid Waste Resource Utilization and Environmental Protection of Haikou City, Haikou, 570228, China.
Chemosphere. 2024 Sep;364:142992. doi: 10.1016/j.chemosphere.2024.142992. Epub 2024 Jul 31.
A straightforward and eco-friendly preparation method for porous sludge biochar (SBA-3) was developed to deodorize gaseous dimethyl disulfide (DMDS) using ion exchange to adjust micropore structures coupled with carboxyl functionalization. Compared with the unmodified sludge biochar SBA-1 and SBA-2 treated with ion exchange, the pore size of SBA-3 decreased accompanied with increasing specific surface area and micropore volume. The Brunauer-Emmett-Teller (BET) specific surface area and micropore volume were 176.35 m g and 0.0314 cm³ g, which were 2.02 and 1.71-fold larger than those of SBA-2, as well as 20.60 and 78.5-fold larger than those of SBA-1, respectively. Meanwhile, the amount of -COOH on the surface of SBA-3 increased from 0.425 to 1.123 mmol g, which was 2.64-fold larger than that of SBA-1. The adsorption behavior between DMDS and SBA-3 could be well described by the quasi-second-order kinetic model and Langmuir isotherm model. The maximum monolayer adsorption capacity was 35.12 mg g at 303 K. Thermodynamic and DFT calculations indicated that the adsorption of DMDS on SBA-3 was exothermic with the deodorization mechanisms involving pore filling and chemisorption.
一种简单、环保的多孔污泥生物炭（SBA-3）制备方法被开发出来，用于通过离子交换调节微孔结构并结合羧基功能化来去除气态二甲基二硫（DMDS）。与未经修饰的污泥生物炭 SBA-1 和经过离子交换处理的 SBA-2 相比，SBA-3 的孔径减小，比表面积和微孔体积增加。BET 比表面积和微孔体积分别为 176.35 m²/g 和 0.0314 cm³/g，分别是 SBA-2 的 2.02 倍和 1.71 倍，是 SBA-1 的 20.60 倍和 78.5 倍。同时，SBA-3 表面的-COOH 数量从 0.425 增加到 1.123 mmol/g，是 SBA-1 的 2.64 倍。DMDS 和 SBA-3 之间的吸附行为可以很好地用准二级动力学模型和 Langmuir 等温线模型来描述。在 303 K 时，最大单层吸附容量为 35.12 mg/g。热力学和 DFT 计算表明，DMDS 在 SBA-3 上的吸附是放热的，其除臭机制涉及孔填充和化学吸附。
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