NuTeC, Department TIW, XIOS, Agoralaan Gebouw H, 3590 Diepenbeek, Belgium.
Water Res. 2012 May 15;46(8):2783-94. doi: 10.1016/j.watres.2012.02.034. Epub 2012 Feb 24.
Copper and zinc removal from water (pH = 5.0) using adsorbents produced from slow and fast pyrolysis of industrial sludge and industrial sludge mixed with a disposal filter cake (FC), post treated with HCl, is investigated in comparison with a commercial adsorbent F400. The results show that a pseudo-second order kinetics model is followed. The Langmuir-Freundlich isotherm model is found to fit the data best. The capacity for heavy metal removal of studied adsorbents is generally better than that of commercial F400. The dominant heavy metal removal mechanism is cation exchange. Higher heavy metal removal capacity is associated with fast pyrolysis adsorbents and sludge/FC derived adsorbents, due to enhanced cation exchange. Improvement of Zn(2+) removal via 1 N HCl post-treatment is only effective when exchangeable cations of the adsorbent are substituted with H(+) ions, which boost the cation exchange capacity. Increase of temperature also enhances metal removal capacity. Fast pyrolysis sludge-based adsorbents can be reused after several adsorption-desorption cycles.
采用慢速和快速热解工业污泥和工业污泥与处置滤饼（FC）混合制成的吸附剂，从 pH = 5.0 的水中去除铜和锌，并与商业吸附剂 F400 进行比较，考察了吸附剂的性能。结果表明，吸附过程符合拟二级动力学模型。Langmuir-Freundlich 等温吸附模型对实验数据拟合度最佳。研究的吸附剂对重金属的去除能力普遍优于商业 F400。重金属的主要去除机制是阳离子交换。由于增强了阳离子交换，快速热解吸附剂和污泥/FC 衍生的吸附剂对重金属的去除能力更高。通过 1N HCl 后处理提高 Zn(2+)去除率仅在吸附剂的可交换阳离子被 H(+)离子取代时有效，这会提高阳离子交换容量。升高温度也会增强金属去除能力。经过几次吸附-解吸循环后，快速热解污泥基吸附剂可以重复使用。
