UV／Fe^(3+)／H_2O_2体系降解活性艳橙X-GN废水的研究

STUDY ON DEGRADATION OF REACTIVE BRILLIANT ORANGE X-GN BY UV/Fe^(3+) /H_2O_2 SYSTEM

采用UV／Fe3+／H2O2体系光解活性艳橙X-GN模拟废水,考察了X-GN,Fe3+和H2O2的初始浓度、初始pH值及温度对光解的影响,探讨了X-GN的降解途径和机理．结果表明,在8W低压汞灯(λ= 254nm)照射下,UV／Fe3+／H2O2能够有效地降解X-GN,在pH=3．0,T=50℃,时间为120 min,Fe3+和 H2O2的初始浓度分别为2．5×10-5mol·l-1和1．5×10-4mol·l-1时,对含200 mg·l-1X-GN模拟废水的色度去除率和矿化率分别达到100％和90．15％．用IC和GC／MS对X-GN降解的中间产物和最终产物进行分析,推导出UV／Fe3+／H2O2体系中X-GN降解的途径和机理．

Photocatalytic degradation of reactive brilliant orange X-GN dye stuff was studied in an self-made photocatalytic reactor with Fe^3＋/H2O2 and 8 W low mercury light （λ = 254 nm） . The effects of initial concentration of X-GN, Fe^3＋,H2O2, initial pH and temperature on degradation were investigated. The results indicate that organic pollutant X-GN that have stable structures can be degraded by UV/Fe^3＋/H2O2 system. 100% of colour removal and 90. 15% of TOC reduction were achieved at pH =3. 0, T =50℃, t =- 120 min, [ Fe^3 ＋ ] = 2. 5 ×10^-5mol·l^-1, [H202] = 1.5×10^-4mol·l^-1 to 200 mg·l^-1 X-GN-containing simulated wastewater. Possible mechanism and pathway of the UV/Fe^3＋/H2O2 reaction in X-GN wastewater was proposed on the basis of experimental results. The intermediates and final produced during the UV/Fe^3＋/H2O2 reaction was detected by IC and GC-MS spectra.