Abstract Sulfide ions (S−2) derived from Na2S in black liquor, after the pulping process, is the source of production H2S during of black liquor recovery cycle in Kraft pulp and paper industries. Tow adsorbents (Cu-PAC, Cu-GAC) by loading Cu+2 on powder activated carbon (PAC) and granular activated carbon (GAC) were synthesized to created more adsorption sites and were improved their selectivity for removing S−2 from black liquor with 3 level of sulfidity (18, 20 and 22 %). The adsorbents were characterized by BET, FTIR, SEM, and EDX. Adsorption of S−2 for Cu-PAC and Cu-GAC were fitted well with Freundlich and Langmuir isotherm model respectively and both of the adsorbents followed pseudo-second-order kinetic. The results of thermodynamic parameters showed the endothermic process. The removal efficiency results showed Cu-PAC has better performance than Cu-GAC. This is due to the higher specific surface area of Cu-PAC, which has led to more adsorption sites for S−2. By considering appropriate temperature conditions and direct effect of the S−2 on the production of H2S during of black liquor recovery cycle, Cu-PAC will be able to prevent H2S production and odorous the black liquor recovery cycle by removing 79.89 % of the S−2.

中文翻译：

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使用合成吸附剂（Cu-PAC 和 Cu-GAC）从牛皮纸黑液回收循环中去除 S-2 的可行性

摘要 黑液中Na2S 衍生的硫化物离子(S−2)，在制浆过程后，是牛皮纸制浆造纸行业黑液回收过程中产生H2S 的来源。通过在粉末活性炭 (PAC) 和颗粒活性炭 (GAC) 上负载 Cu+2 合成两种吸附剂（Cu-PAC、Cu-GAC）以创建更多吸附位点并提高其从黑液中去除 S-2 的选择性具有 3 级硫化度（18、20 和 22 %）。吸附剂通过 BET、FTIR、SEM 和 EDX 进行表征。Cu-PAC和Cu-GAC对S-2的吸附分别符合Freundlich和Langmuir等温线模型，两种吸附剂均遵循伪二级动力学。热力学参数结果显示吸热过程。去除效率结果表明，Cu-PAC 比 Cu-GAC 具有更好的性能。这是由于 Cu-PAC 具有更高的比表面积，这导致了更多的 S-2 吸附位点。通过考虑适当的温度条件和 S−2 对黑液回收循环中 H2S 生成的直接影响，Cu-PAC 将能够通过去除 79.89% 的 S− 来防止 H2S 生成和黑液回收循环中的异味。 2.