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【答案】应助回帖
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NY_sky: 金币+200, 翻译EPI+1, ★★★★★最佳答案 2019-10-17 20:22:48
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Different from the adsorption of TC alone, the adsorption of TC by synergistic adsorption under acidic conditions was low. It increased significantly with the increase of pH, peaked when the pH was 6.5, and decreased when pH further increased to the alkaline range. Compared with the adsorption of Zn2+ alone, the presence of TC has little effect on the adsorption of Zn2+. The above results can be attributed to the formation of complexes (TC-Zn2+) in aqueous solution or the impact of surface bridging (TC- or Zn2+). Under acidic conditions, H3O+ will compete for adsorption sites, so the adsorption is not obvious. As the pH increased to 6.0, the promotion effect of adsorption was significantly enhanced, and the adsorption of Zn2+ and TC peaked. When the pH was further alkaline, the affinity between Zn2+ and TC was weakened. Due to the influence of deprotonation, the electrostatic repulsion significantly reduced the adsorption of TC and Zn2+ [25]. Therefore, in the experiments of synergistic adsorption of Zn2+ and TC, the optimum pH was 6.0. |
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