Abstract：
Dyes pose great threats to the aquatic environment and human health. Fe0-based Fenton-like systems have been widely employed for the degradation of organic dyes. However, the regulation of degradability and recyclability was still unclear. In this study, Rhodamine B (RhB) was served as the model pollutant, hydroxylamine hydrochloride was selected as the RA, the natural photocatalysis system demonstrated stable operation. RA, as performance enhancement agent, was firstly reported in micro/nano-Zero-Valent Iron@Biochar (m/nZVI@BC) based SPC-RA system. Carrier size-fractionated m/nZVI@BC was fabricated by one-step carbothermal method. As a result, RA synergistically interacted with SPC, and the reaction time reduced from 15 min to 4 min. In the 0.010 g m/nZVI@BC-mediated SPC-RA system, over 95% of RhB (100 mg·L-1, 1041.667 mg·g-1) was successfully degraded. The maximum degradation ability could still exceed 1g·g-1 via 5 times repeated applications. Meanwhile, the loss of degradability, caused by halving SPC concentration could be compensated by RA dosage measurement. The entire degradation process was predominantly dominated by free radicals (•OH> 1O2> •O2-> •CO3-). Reactive oxidizing species (ROSs) were primarily excited by α-Fe0, Fe3C and N sites of biochar (BC). Light and BC carrier dedicated slight influence. These discoveries shed a light on the activity and recyclability regulation of catalytic material, aligning with the principles of green chemistry and cleaner production. This study demonstrates a novel approach to efficient management of solid waste disposal, reuse of waste biomass, advanced treatment of dye-containing wastewater, pollution control in aquatic environments.
摘要：
染料对水生环境和人类健康构成巨大威胁。基于Fe0的类Fenton体系已广泛用于降解有机染料。然而,降解性和可回收性的调节仍不清楚。在这项研究中,罗丹明B(RhB)作为模型污染物，选择盐酸羟胺作为RA，自然光催化系统运行稳定。RA,作为性能增强代理，首次报道了基于微/纳米零价铁@生物炭(m/nZVI@BC)的SPC-RA系统。通过一步碳热法制备了载体尺寸分级的m/nZVI@BC。因此,RA与SPC协同互动，反应时间从15分钟减少到4分钟。在0.010gm/nZVI@BC介导的SPC-RA系统中，成功降解了95%以上的RhB(100mg·L-1,1041.667mg·g-1)。通过5次重复应用，最大降解能力仍可超过1g·g-1。同时,降解性的损失，由SPC浓度减半引起的，可以通过RA剂量测量来补偿。整个降解过程主要由自由基(•OH>1O2>•O2->•CO3-)主导。活性氧化物质（ROSs）主要由生物炭（BC）的α-Fe0，Fe3C和N位点激发。光及BC载体专用轻微影响。这些发现揭示了催化材料的活性和可回收性调节，符合绿色化学和清洁生产的原则。这项研究展示了一种有效管理固体废物处理的新方法，废弃生物质的再利用，含染料废水的深度处理，水生环境中的污染控制。
