摘要
催化臭氧氧化工艺是处理难降解废水的有效手段,但仍存在臭氧利用率较差、催化效率低、催化剂活性组分流失等问题.本文以α-Fe_(2)O_(3)作为臭氧催化剂,通过SEM、N_(2)吸附/脱附等方法表征了α-Fe_(2)O_(3)的结构,构建了α-Fe_(2)O_(3)催化臭氧氧化处理苯酚废水体系,优化催化条件,提高处理效率,并对催化机理和催化剂稳定性进行了深入讨论.结果表明:①α-Fe_(2)O_(3)表现为团聚的不规则球状,且比表面积较大,达83.38 m^(2)/g,具有良好的臭氧催化潜力.②臭氧投加量和pH对催化体系的影响明显,但α-Fe_(2)O_(3)投加量的变化对降解效果的控制并不显著,在优化的条件下反应30 min时COD的去除率可达97.67%,较单独臭氧提高了41.33%.③在催化臭氧氧化中投加TBA和Na_(3)PO_(4)分别屏蔽·OH和路易斯酸性位点后,COD的去除率分别降低了17.01%和20.92%,这表明在α-Fe_(2)O_(3)表面的路易斯酸性位点产生的·OH是COD去除率高的主要原因.④α-Fe_(2)O_(3)在重复试验中保持了较高的催化活性和稳定性,6次重复后对COD的去除率仍可达到93.07%,流失率为1.05%.研究显示,α-Fe_(2)O_(3)表现了优异的臭氧分解协同作用,具有良好的苯酚持续去除能力和结构稳定性,可为高效去除含酚废水或难降解废水提供技术参考.
Due to the gradual development of industrial technology in China,more and more toxic and harmful refractory organic compounds are produced in the production and manufacturing process.Therefore,effective treatment of refractory wastewater is particularly important.Catalytic ozonation process is an effective means of treating refractory wastewater,but there are still some problems such as poor ozone utilization rate,low catalytic efficiency,and loss of active components of the catalyst.In this study,α-Fe_(2)O_(3) was used as the ozone catalyst,the structure ofα-Fe_(2)O_(3) was characterized by SEM,N_(2) adsorption/desorption and other methods,and aα-Fe_(2)O_(3) catalytic ozonation system for phenol wastewater treatment was constructed to optimize the catalytic conditions and improve the treatment efficiency.The catalytic mechanism and catalyst stability were discussed in depth.The results showed that:(1)α-Fe_(2)O_(3) were irregular spherical agglomerates with a specific surface area of 83.38 m^(2)/g,which has a good O_(3) catalytic potential.(2)The ozone dosage and pH had obvious effects on the catalytic system,but the change ofα-Fe_(2)O_(3) dosage had no obvious control on the degradation effect.Under the optimized conditions,the COD removal rate could reach 97.67%after 30 min of reaction,which was 41.33%higher than that of ozone alone.(3)After·OH and Lewis acid sites were shielded by TBA and Na_(3)PO_(4) in the catalytic oxidation,the COD removal rates decreased by 17.01%and 20.92%,respectively,indicating that the·OH generated at Lewis acid sites on the catalyst surface was the main reason for the high COD removal rate.(4)α-Fe_(2)O_(3) maintained high catalytic activity and stability in the repeated tests.After six repetitions,the COD removal rate could still reach 93.07%,and the loss rate was 1.05%.α-Fe_(2)O_(3) shows excellent synergistic effect of ozone decomposition,has good continuous phenol removal ability and structural stability,and can provide technical reference for the efficient removal of phe
作者
王勇
杜明辉
张宁
高群丽
张耀宗
孙晓明
WANG Yong;DU Minghui;ZHANG Ning;GAO Qunli;ZHANG Yaozong;SUN Xiaoming(School of Architecture and Civil Engineering,North China University of Science and Technology,Tangshan 063000,China;State Environmental Protection Key Laboratory of Ecological Industry,Chinese Research Academy of Environmental Sciences,Beijing 100012,China)
出处
《环境科学研究》
CAS
CSCD
北大核心
2022年第8期1818-1826,共9页
Research of Environmental Sciences
基金
国家水体污染控制与治理科技重大专项(No.2017ZX07402-002)。
