An FeS/graphene-based catalyst (DMG) was established here through a novel double-network template way for peroxymonosulfate (PMS) activation considering the effect of the template and iron species on catalysis performance. For comparison, single-network hydrogels were also used to prepare catalysts named AMG and PMG, respectively. Results proved that DMG had obvious structural improvement compared to AMG and PMG, including its lower agglomeration, higher specific surface area, higher S²⁻/SO₄²⁻ ratio, higher CC (sp²) content, more unsaturated C–O bonds and better conductivity. The double network template has been shown to provide more contact sites for the pollutant tetracycline, enable easier regeneration of Fe(II) and promote electron transport. Density functional theory (DFT) calculations revealed the effect of sulfur conversion on PMS activation. The results indicate promising applications of double-network templated catalysts for environmental remediation and provide new insights into the oxidant activation mechanism.

中文翻译：

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具有增强的PMS活化性能的双网络水凝胶模板化FeS /石墨烯：考虑模板和铁物种的影响

考虑到模板和铁种类对催化性能的影响，通过新颖的双网络模板方法建立了FeS /石墨烯基催化剂（DMG），用于过氧单硫酸盐（PMS）活化。为了进行比较，单网络水凝胶也分别用于制备名为AMG和PMG的催化剂。结果证明，DMG与AMG和PMG相比具有明显的结构改进，包括较低的团聚，较高的比表面积，较高的S ^2- / SO ₄ ^2-比率，较高的C C（sp ²）含量，更多的不饱和C-O键和更好的导电性。已显示双网络模板可为污染物四环素提供更多的接触位点，使Fe（II）并促进电子传输。密度泛函理论（DFT）计算揭示了硫转化对PMS活化的影响。结果表明双网络模板化催化剂在环境修复中的应用前景广阔，并为氧化剂活化机理提供了新的见解。