ABSTRACT

Recycling of valuable metals from spent catalysts in a green way is gaining extensive interest for economic and environment reasons. In this study, we developed novel hydrophobic deep eutectic solvents to extract Mo from spent catalysts. The hydrophobic DESs have been designed and synthesized by mixing one molar of the quaternary ammonium salt and two molars of various saturated fatty acids with different carbon chain lengths. The extraction ability and extraction mechanism of these DESs were studied, some factors influencing the extraction efficiency, including the structure of hydrogen bond acceptors and hydrogen bond donors, initial aqueous pH, reaction time and temperature, phase ratios were investigated. It is found that the synthesized hydrophobic DESs exhibit excellent extraction performance toward Mo, where the Mo distribution ratio is more than 2200 in the presence of other metals, corresponding to an extraction efficiency of 99% at optimal reaction conditions. This work reveals a distinct class of materials, guiding an effective and green way for spent catalyst treatment.

Implications: Novel hydrophobic deep eutectic solvents have been developed to extract Mo from spent catalysts, the synthesized hydrophobic DESs possess several advantages, such as green, low price, low toxicity, and biodegradability. It exhibits excellent extraction performance under an optimized extraction condition. This work reveals a distinct class of materials, guiding a promising way for green and economical utilization of spent catalysts.

摘要

出于经济和环境原因，以绿色方式从废催化剂中回收有价值的金属正引起广泛关注。在这项研究中，我们开发了新型疏水性低共熔溶剂来从废催化剂中提取 Mo。疏水性DESs是通过混合一摩尔季铵盐和两摩尔具有不同碳链长度的各种饱和脂肪酸来设计和合成的。研究了这些DESs的提取能力和提取机理，考察了影响提取效率的一些因素，包括氢键受体和氢键供体的结构、初始水相pH、反应时间和温度、相比。发现合成的疏水性DESs对Mo表现出优异的提取性能，其中Mo分布比在其他金属存在下大于2200，对应于最佳反应条件下99%的提取效率。这项工作揭示了一类独特的材料，为废催化剂处理提供了一种有效且绿色的方法。

启示：已经开发出新型疏水性低共熔溶剂来从废催化剂中提取钼，合成的疏水性 DESs 具有绿色、低价、低毒和可生物降解等优点。它在优化的提取条件下表现出优异的提取性能。这项工作揭示了一类独特的材料，为废催化剂的绿色和经济利用提供了一种有前途的方法。