The recovery of platinum from waste is of high importance since significant concentrations are lost during processing, but the current methods are not economically effective. The removal of Pt4+ from aqueous solutions at different conditions using zeolite functionalised with 3-aminopropyl(diethoxy)methylsilane (APDEMS) was investigated. The adsorbent was used to assess the effect of adsorbent mass, pH, concentration, time and competing ions on the removal of Pt4+ so that optimum working conditions could be determined. The two- and three-parameter isotherm models as well as kinetic models were fitted using the experimental data. Effect of adsorbent bed height (2 and 5 cm), pH (2–7) and initial concentration (2 and 5 mg L−1) was determined with column experiments. Significant adsorption capacity was achieved with 100 mg adsorbent at pH 2, within 180 min. Adsorption capacity of Pt4+ significantly decreased at pH > 2. Higher bed depth increased the exhaustion and breakthrough times. The adsorption capacity of Pt4+ increased as bed height and concentration increased. The highest breakthrough and exhaustion times were achieved at pH 2. Strong Pt4+-adsorbent interaction concluded from the experiments, adsorption kinetics and isotherms models indicates that APDEMSFZ is suitable for Pt4+ recovery from mining wastewater.

中文翻译：

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批量和流通柱吸附研究：通过 3-氨基丙基（二乙氧基）甲基硅烷功能化沸石 (APDEMSFZ) 从水溶液中回收 Pt4+

从废物中回收铂非常重要，因为在加工过程中会损失大量的铂，但目前的方法在经济上并不有效。研究了使用 3-氨基丙基（二乙氧基）甲基硅烷 (APDEMS) 官能化的沸石在不同条件下从水溶液中去除 Pt4+。吸附剂用于评估吸附剂质量、pH、浓度、时间和竞争离子对 Pt4+ 去除的影响，以便确定最佳工作条件。使用实验数据拟合二参数和三参数等温线模型以及动力学模型。吸附剂床高度（2 和 5 cm）、pH (2-7) 和初始浓度（2 和 5 mg L-1）的影响通过柱实验确定。100 mg 吸附剂在 pH 2 下实现了显着的吸附能力，180 分钟内 Pt4+ 的吸附能力在 pH > 2 时显着降低。床层深度越高，耗尽和穿透时间越长。Pt4+ 的吸附能力随着床层高度和浓度的增加而增加。在 pH 2 下实现了最高的穿透和耗尽时间。从实验、吸附动力学和等温线模型得出的强 Pt4+-吸附剂相互作用表明，APDEMSFZ 适用于从采矿废水中回收 Pt4+。