ABSTRACT

The present work deals with the extraction and pre-concentration of nickel (II) ions using emulsified liquid membrane (ELM) in the presence of di- (2-ethylhexyl) phosphoric acid (D2EHPA) as an extractant. The emulsion stability was achieved by the biodegradable surfactants Triton X-100 addition diluted in kerosene. Influence of operating conditions that affect ELM performance were investigated. A comparative study between the optimization parameters of this process was carried out both experimentally and with the Response Surface Methodology (RSM), in accordance with the Box–Behnken matrix. The following parameters were investegated: D2EHPA / Triton X-100 ratio between 0.5 and 3.5, initial concentration of the feed phase between 200 and 500 ppm and pH of the feed phase from 2.5–10. The transport of Ni (II) ions was evaluated according to the extraction yield as an analytical response and the optimal conditions were determined. It was found that the calculated values being in good agreement with experimental data that under the optimized conditions ([Ni] = 350 ppm, Vagitation = 200 rpm, t = 20 min and pH = 6.6), Ni (II) ions extraction was recorded more than 94% of efficiency.

摘要

本工作涉及在二 (2-乙基己基) 磷酸 (D2EHPA) 作为萃取剂存在下，使用乳化液膜 (ELM) 萃取和预浓缩镍 (II) 离子。通过添加稀释在煤油中的可生物降解的表面活性剂 Triton X-100 来实现乳液稳定性。研究了影响 ELM 性能的操作条件的影响。根据 Box-Behnken 矩阵，通过实验和响应面方法 (RSM) 对该过程的优化参数进行了比较研究。研究了以下参数：D2EHPA / Triton X-100 比率在 0.5 和 3.5 之间，进料相的初始浓度在 200 和 500 ppm 之间，进料相的 pH 值在 2.5-10 之间。根据作为分析响应的提取率评估 Ni (II) 离子的传输，并确定最佳条件。结果发现，在优化条件下（[Ni] = 350 ppm，Vagitation = 200 rpm，t  = 20 分钟和 pH = 6.6)，记录了 Ni (II) 离子提取效率超过 94%。