摘要
通过化学浴沉淀法制备了Co掺杂的FeOOH与石墨相氮化碳复合材料(Co-FeOOH/g-C3N4),作为非均相光芬顿催化剂,以罗丹明B(RhB)为目标污染物,分别考察了Co掺杂量、pH、温度、H2O2浓度、催化剂剂量等因素对光催化效率的影响。在最佳反应条件下,Co-FeOOH、g-C3N4和Co-FeOOH/g-C3N4对RhB的去除率分别为23.7%、59.6%和91.5%。通过阿伦尼乌斯方程计算得到反应的活化能为12.8 kJ·mol^−1,通过自由基捕获实验证实·OH与h+均为起主要作用的活性物种。Co-FeOOH/g-C3N4经过5次循环使用后,对RhB的去除率没有明显下降,说明其具有良好的稳定性。最后,以天然日光作为驱动光源,考察了催化剂对高浓度染料废水的处理性能,反应6 h后,废水的脱色率达到100%,COD去除率为43.9%,延长反应时间至10 h,COD的去除率达到81.6%。在非均相芬顿反应中引进了可见光,在提高降解反应速率的同时降低了催化反应发生的成本,本研究结果可为非均相光芬顿体系的实际应用提供实验基础。
In this study,a kind of heterogeneous photo-Fenton catalyst:Co-doped FeOOH and graphitic carbon nitride composite(Co-FeOOH/g-C3N4),was prepared through the chemical bath precipitation method.Rhodamine B(RhB)was chosen as the target to investigate the effects of the operational conditions such as Co dosage in composite,pH,temperature,H2O2 concentration and catalyst dosage on the light catalytic efficiency.Under the optimal conditions,the removal rates of RhB by Co-FeOOH,g-C3N4 and Co-FeOOH/g-C3N4 were 23.7%,59.6%and 91.5%,respectively.The calculated activation energy of the reaction was 12.8 kJ·mol^−1 through the Arrhenius equation.The radical trapping experiments confirmed that both·OH and h+were active species in the reaction process.After 5 cycles of Co-FeOOH/g-C3N4 regeneration-recycling,the removal rate of RhB did not decreased significantly,indicating its good stability.Finally,a simulative dye wastewater with high concentration was treated by the composite catalyst under natural solar light irradiation.Six hours later,the decolorization rate and COD removal rate from wastewater reached 100%and 43.9%.,respectively.When the reaction time was extended to 10 h,the COD removal rate reached 81.6%.In this study,visible light was introduced into the heterogeneous Fenton reaction,which increased the degradation reaction rate and reduced the cost of the catalytic reaction,it provides an experimental basis for the practical application of the heterogeneous Fenton system.
作者
宋思扬
吴丹
赵焕新
曹宇
王欣
赵宇
SONG Siyang;WU Dan;ZHAO Huanxin;CAO Yu;WANG Xin;ZHAO Yu(College of Environmental and Safety Engineering,Shenyang University of Chemical Technology,Shenyang 110142,China;Fushun Research Institute of Environmental Science,Fushun 113006,China)
出处
《环境工程学报》
CAS
CSCD
北大核心
2020年第12期3262-3269,共8页
Chinese Journal of Environmental Engineering
基金
辽宁省教育厅一般项目(LQ2019015)
大连理工大学工业生态与环境工程教育部重点实验室开放基金(KLIEEE-19-08)。
