Department of Biological Environment, Kangwon National University, Chuncheon 24341, Republic of Korea.
Gangwon Institute of Health and Environment, Chuncheon 24203, Republic of Korea.
J Hazard Mater. 2021 Oct 5;419:126470. doi: 10.1016/j.jhazmat.2021.126470. Epub 2021 Jun 24.
Biological desulfurization processes of landfill gas yield an enormous amount of biologically produced S (BPS) as a byproduct. Capability of BPS to remove Cd from aqueous solutions was tested and its removal efficiency was compared to that of granular activated carbon (GAC). Kinetics of Cd removal by BPS was a two-stage process with an initial rapid adsorption showing 45% of initial Cd was removed within 5 min, followed by a slower adsorption. Cadmium adsorption onto the BPS fitted the Langmuir isotherm model and maximum adsorption capacity of the BPS (63.3 mg g) was 1.8 times higher than that of GAC (36.1 mg g). Thermodynamic parameters showed that Cd adsorption by BPS was favorable and endothermic. Data from XPS proved the main adsorption mechanism to be complexation of Cd with sulfides in the BPS. Results demonstrated that BPS can be recycled as a novel adsorbent for Cd removal from wastewater.
垃圾填埋气的生物脱硫工艺会产生大量的生物产生的硫（BPS）作为副产品。测试了 BPS 从水溶液中去除 Cd 的能力，并将其去除效率与颗粒状活性炭（GAC）进行了比较。BPS 去除 Cd 的动力学是一个两阶段过程，初始快速吸附表明，在 5 分钟内去除了初始 Cd 的 45%，然后是较慢的吸附。Cd 吸附到 BPS 上符合朗缪尔等温线模型，BPS 的最大吸附容量（63.3 mg g）比 GAC（36.1 mg g）高 1.8 倍。热力学参数表明，BPS 对 Cd 的吸附是有利的和吸热的。XPS 数据证明了主要的吸附机制是 Cd 与 BPS 中的硫化物的络合。结果表明，BPS 可以作为一种从废水中去除 Cd 的新型吸附剂进行回收。
