About 60 million tons of Fe-rich Cu slag (IRCS) are generated annually worldwide during Cu slag flotation and cause irreversible water and soil pollution. Current research provides an environmentally friendly technology, the preparation of internal electrolysis materials (IEMs) through the carbothermal reduction of IRCS, for the degradation of printing and dyeing wastewater. XRD and SEM–EDS indicated that carbothermal reduction could promote the conversion of fayalite to zero-valent iron (ZVI), and ZVI could effectively form IEM with residual carbon. The degradation capacity of IEM for methylene blue (MB) was remarkably improved compared with raw IRCS after roasting for 60 min at 1100°C with 35% anthracite dosage. MB degradation efficiency improved by increasing the IEM dosage and reaction temperature and decreasing the MB concentration and solution pH. FTIR, XRD, SEM–EDS, and XPS all detected the formation of Fe oxide or Fe hydroxide. UV–vis and TOC demonstrated that the characteristic groups of MB were destroyed and resulted in the mineralization of MB. MB degradation could be attributed to the Fe²⁺, [H], and ·OH produced by the galvanic reaction induced by IEM. Overall, this study offers theoretical guidance in the treatment of printing and dyeing wastewater and the reuse of IRCS.

全球每年在铜渣浮选过程中产生约 6000 万吨富铁铜渣 (IRCS)，并造成不可逆转的水和土壤污染。目前的研究提供了一种环保技术，即通过碳热还原IRCS制备内电解材料（IEMs），用于印染废水的降解。XRD和SEM-EDS表明，碳热还原可以促进铁橄榄石向零价铁（ZVI）的转化，并且ZVI可以有效地与残余碳形成IEM。焙烧 60 年后，IEM 对亚甲基蓝 (MB) 的降解能力较原料 IRCS 显着提高 分钟在 1100°C 与 35% 无烟煤剂量。通过增加 IEM 剂量和反应温度以及降低 MB 浓度和溶液 pH 值来提高 MB 降解效率。FTIR、XRD、SEM-EDS 和 XPS 均检测到氧化铁或氢氧化铁的形成。UV-vis 和 TOC 表明，MB 的特征基团被破坏，导致 MB 矿化。MB降解可归因于IEM诱导的原电池反应产生的Fe ²⁺、[H]和· OH。总体而言，本研究为印染废水的处理和IRCS的回用提供了理论指导。