Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India.
Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India.
Int J Biol Macromol. 2019 Apr 15;127:320-329. doi: 10.1016/j.ijbiomac.2019.01.033. Epub 2019 Jan 9.
This article targets the efficacy of chitosan cross-linked 3-Amino-1,2,4-triazole-5-thiol derivative for the recovery of Pd from synthetic electroless plating solutions (ELP) whose solution chemistry complexity is brought forward with ethylenediaminetetraacetic acid (EDTA), ammonium hydroxide (NHOH), and surfactant (cetyl trimethyl ammonium bromide (CTAB)). Batch adsorption characteristics of the resin were investigated in the parametric range of 2-10 pH, 0.2-2 g L adsorbent dosage, 5-1080 min contact time, 50-300 mg L Pd concentration and 25-60 °C operating temperature. Equilibrium, kinetic and thermodynamic model fitness studies were also considered. Pd(II) adsorption characteristics were determined using NaOH, KOH and HCl solutions with variant eluent concentrations (0.1-2 N). The solution chemistry complexity has been evaluated to have profound impact in detrimentally influencing Pd sorption characteristics of the CH-AZ resin. The resin has been characterized to be highly effective for Pd removal from synthetic ELP solutions but with moderate efficacy towards the noble metal recovery and reuse.
本文针对壳聚糖交联 3-氨基-1,2,4-三唑-5-硫醇衍生物从具有乙二胺四乙酸 (EDTA)、氨水溶液 (NHOH) 和表面活性剂 (十六烷基三甲基溴化铵 (CTAB)) 的合成化学镀 (ELP) 溶液中回收钯的功效进行了研究。在 2-10 pH、0.2-2 g/L 吸附剂用量、5-1080 min 接触时间、50-300 mg/L Pd 浓度和 25-60°C 操作温度的参数范围内，研究了树脂的批吸附特性。还考虑了平衡、动力学和热力学模型拟合研究。使用 NaOH、KOH 和 HCl 溶液，通过不同的洗脱剂浓度 (0.1-2 N)，确定了 Pd(II)的吸附特性。溶液化学复杂性被评估为对 CH-AZ 树脂的钯吸附特性具有深远的影响。该树脂已被证明对从合成 ELP 溶液中去除钯非常有效，但对贵金属的回收和再利用的效果适中。
