The 4-chloro-2-amino phenol (4C2AP) bearing wastewater is produced while manufacturing dyes and pharmaceutical ingredients. Ni- and Cu-based cost-effective catalysts were developed, typically characterized, and subjected to hydrodechlorination (HDC) of 4C2AP. The role of reducing agents, concentration, pH of wastewater, presence of salt, reaction temperature, catalyst reuse, and the kinetics was investigated. A selective makeover of 2-amino phenol (2AP) was analyzed by HPLC, LCMS, and NMR. A complete HDC of 4C2AP with remarkable selectivity (98%) toward 2AP was achieved using a Ni⁰ catalyst and NaBH₄ at room temperature. It is observed that the alkaline condition, the presence of salt, and a high reaction temperature favor the HDC process. A maximum of 1 g L^–1 of the Ni⁰ loading is found to be sufficient to dechlorinate the pollutant. It can be concluded that the catalytic HDC is a technically viable and inexpensive process for the conversion of 4C2AP into a valuable product, 2AP.

中文翻译：

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使用 Ni 和 Cu 基催化剂将 4-Chloro-2-Aminophenol 加氢脱氯成可回收产品

生产染料和药物成分时会产生含 4-氯-2-氨基苯酚 (4C2AP) 的废水。Ni 和 Cu 基成本效益高的催化剂被开发出来，典型地表征，并进行了 4C2AP 的加氢脱氯 (HDC)。研究了还原剂的作用、浓度、废水的 pH 值、盐的存在、反应温度、催化剂再利用和动力学。通过 HPLC、LCMS 和 NMR 分析了 2-氨基苯酚 (2AP) 的选择性改造。使用Ni ⁰催化剂和NaBH ₄在室温下实现了对2AP具有显着选择性(98%)的4C2AP的完整HDC。据观察，碱性条件、盐的存在和高反应温度有利于 HDC 工艺。最多 1 g L ^–1发现Ni ⁰负载量足以使污染物脱氯。可以得出结论，催化 HDC 是将 4C2AP 转化为有价值的产品 2AP 的技术上可行且成本低廉的工艺。