A laboratory scale closed-loop cycle system for the complete regeneration of sodium persulfate/sulfuric acid etching solution (SPS) has been developed by anode oxidation of sulfate paired to cathode reduction of copper. A current-efficient (110%), zero-chemical dosage and zero-emission strategy for complete regeneration of SPS and recovery of copper was achieved. The micro-etching rate of the recycled SPS has no significant difference compared with that of the fresh SPS. On average, the cost of etching in this recycling system is decreased by 100%, compared with that in the current printed circuit boards used in industries. The full utilization of spent SPS realizes waste to wealth conversion in the true sense. The developed recycling system is a techno-economically feasible, environmentally friendly, sustainable, clean and green process for the reuse of SPS and recovery of valuable metal Cu through electrooxidation of sulfate paired to electroreduction of copper.

中文翻译：

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硫酸盐的电氧化与铜的电解还原成对的过硫酸盐/硫酸蚀刻液的再生

通过硫酸盐的阳极氧化与铜的阴极还原配对，已开发出一种用于大规模再生过硫酸钠/硫酸蚀刻溶液（SPS）的实验室规模的闭环循环系统。实现了电流有效（110％），零化学剂量和零排放策略，可完全再生SPS和回收铜。与新鲜的SPS相比，回收的SPS的微蚀刻速率没有显着差异。与目前工业上使用的印刷电路板相比，该回收系统中的蚀刻成本平均降低了100％。充分利用用过的SPS可以真正实现废物到财富的转化。发达的回收系统在技术上经济可行，环境友好，可持续，