摘要
分别以天然的黄铁矿、磁铁矿、钛铁矿、钒钛磁铁矿、镁铁矿和铁电气石为催化剂,研究了含铁矿物UVFenton体系处理偶氮染料酸性橙7(AO7)的效能和机理。结果表明:引入UV后6种矿物催化Fenton体系处理酸性橙7的效果均显著提高,磁铁矿和镁铁矿的最佳TOC去除率分别可达58.06%、56.64%,且各矿物体系处理效果与溶出总铁离子含量具有明显相关性。通过与等量溶出铁离子的均相UV-Fenton对比,发现含铁矿物催化UV-Fenton体系的氧化处理效果主要来自于溶出铁离子的均相UV-Fenton氧化作用,而来自于矿物表面催化UV-Fenton氧化作用的贡献不明显。此外UV直接光解和光助H_(2)O_(2)分解氧化的作用较弱,而黄铁矿、磁铁矿和镁铁矿在重复利用1或2次后的光催化氧化具有一定的贡献作用。同时,黄铁矿、铁电气石、钒钛磁铁矿的表面溶解过程对体系的处理效果影响明显。磁铁矿和镁铁矿表现出了稳定的高效催化性能、较低的铁溶出性能和一定的光催化氧化作用,且方便磁性回收,具有作为理想的异相UV-Fenton催化剂的潜力。
The efficiency and mechanism of treating acid orange 7(AO7)azo dye by UV-Fenton system with iron-containing minerals were studied using natural pyrite,magnetite,ilmenite,vanadium titanium magnetite,magnesioferrite and iron tourmaline as catalysts.The results showed that the introduction of UV significantly improved the degradation efficiency of acid orange 7 using the Fenton system catalyzed by six minerals.The optimal TOC removal rates for magnetite and magnesioferrite were 58.06%and 56.64%,respectively,and the treatment effects of these systems were significantly correlated with the contents of total dissolved iron ions.By comparing with the homogeneous UV-Fenton system with equal contents of dissolved iron ions,it was found that the oxidation treatment effect of UV-Fenton system catalyzed by these minerals mainly came from the homogeneous UV-Fenton oxidation catalyzed by dissolved iron ions,while the contribution from UV-Fenton oxidation catalyzed by the surface of minerals was not significant.In addition,it was showed that UV direct photolysis and photo assisted decomposition of H_(2)O_(2)had weak oxidation effect,while the photocatalytic oxidation from pyrite,magnetite and magnesioferrite after first or second use had a certain contribution to the degradation of AO7.Meanwhile,the surface dissolution process of pyrite,iron tourmaline and vanadium titanium magnetite had a significant impact on the treatment effect of the system.Magnetite and magnesioferrite exhibit stable and efficient catalytic performance,low iron leaching capacity,certain photocatalytic oxidation activity,and are convenient for magnetic recovery,which are the potential catalysts for heterogeneous UV-Fenton system.
作者
彭慧玲
赖发英
王国锋
熊家平
赖荣圣
何晋保
PENG Huiling;LAI Faying;WANG Guofeng;XIONG Jiaping;LAI Rongsheng;HE Jinbao(School of Land Resource and Environment,Jiangxi Agricultural University,Key Laboratory of Poyang Lake Watershed Agricultural Resource and Ecology of Jiangxi Province,330045;Jiangxi Academy of Eco-Environmental Sciences and Planning,Jiangxi Provincial Key Laboratory of Environmental Pollution Control,330039,Nanchang,China)
出处
《水处理技术》
北大核心
2025年第12期81-87,共7页
Technology of Water Treatment
基金
国家自然科学基金项目(52460006)
江西省自然科学基金项目(20242BAB25148)
江西省研究生创新专项资金项目(YC2023-S363)。
