Coal gasification slag (CGS) is a carbon-containing solid waste used as an adsorbent to remove low concentrations of mercury from wastewater in a series of batch tests to assess its adsorption properties and safe storage. The results showed that the adsorption of mercury on CGS was a very rapid and efficient process, and adsorption equilibrium was reached in only 10–40 min. A pseudo-second-order kinetics model provided a better fit to the equilibrium data. The adsorption capacity on CGS was just slightly below the value of active carbon. CGS showed the highest mercury removal efficiency at a solution pH of 4. Although the presence of other metal cations and anions affected the adsorption, CGS showed good selectivity for mercury ions. The adsorption of mercury was not affected by low concentrations of Cr 3+ or Cu 2+ . The negative interference of anions on the removal efficiency followed the order: Cl − >H 2 PO 4 − >CO 3 2− . The adsorption mechanism related to the functional groups included ion exchange, precipitation, coordination complexation, and surface complexation. Mercury adsorbed on CGS leached very slowly in weakly acidic or basic solution. All results of the study indicate that CGS is an economical and safe adsorbent for potential industrial applications.

中文翻译：

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利用煤气化渣快速去除废水中低浓度汞

煤气化炉渣 (CGS) 是一种含碳固体废物，用作吸附剂，在一系列批量测试中去除废水中的低浓度汞，以评估其吸附性能和安全储存。结果表明，汞在 CGS 上的吸附是一个非常快速和有效的过程，并且仅在 10-40 分钟内达到吸附平衡。伪二级动力学模型提供了对平衡数据的更好拟合。CGS 的吸附容量略低于活性炭的值。CGS 在溶液 pH 值为 4 时显示出最高的汞去除效率。虽然其他金属阳离子和阴离子的存在影响了吸附，但 CGS 对汞离子显示出良好的选择性。汞的吸附不受低浓度Cr 3+ 或Cu 2+ 的影响。阴离子对去除效率的负干扰顺序为：Cl - >H 2 PO 4 - >CO 3 2- 。与官能团相关的吸附机制包括离子交换、沉淀、配位络合和表面络合。吸附在 CGS 上的汞在弱酸性或碱性溶液中浸出非常缓慢。研究的所有结果表明，CGS 是一种经济且安全的吸附剂，可用于潜在的工业应用。