针对鲁奇炉煤气化废水中酚类污染物难降解而无法满足生化处理的难题,采用热化学法制备钛铱钽催化电极(Ti/IrO2-Ta2O5),并将其作为阳极对鲁奇炉煤气化废水进行电催化降解。结果表明,当电流密度为50 m A/cm2、NaCl质量浓度为9.5 g/L、pH为...针对鲁奇炉煤气化废水中酚类污染物难降解而无法满足生化处理的难题,采用热化学法制备钛铱钽催化电极(Ti/IrO2-Ta2O5),并将其作为阳极对鲁奇炉煤气化废水进行电催化降解。结果表明,当电流密度为50 m A/cm2、NaCl质量浓度为9.5 g/L、pH为4、降解时间为180 min时,苯酚和COD的去除率较高,分别可达92%和48%。废水色度极大降低,BOD/COD提高至0.42,降解后的废水可满足生化处理要求。动力学研究表明,废水降解过程符合表观一级反应的动力学规律。展开更多
A novel method for preparing Ta-doped Ti02 via using Ta2 05 as the doping source is proposed. The preparation process combines the hydrothernlal fluorination of Ta2O5 and the subsequent formation of Ta-doped TiO2 sol....A novel method for preparing Ta-doped Ti02 via using Ta2 05 as the doping source is proposed. The preparation process combines the hydrothernlal fluorination of Ta2O5 and the subsequent formation of Ta-doped TiO2 sol. The results show that the doped sample annealed at 393 K generates an unstable intermediate NH4 TiOF3, which converts into anatase TiO2 with the increase of temperature. After annealing at ≥673K, the Ta-doped TiO2 nanocrystals with the grain size 〈20nm are obtained. Both the XRD and TG-DSC results confirm that Ta doping prevents the anatase-rutile crystal transition of TiO2. The band gap values of the doped samples, as obtained by UV-vis diffuse reflectance spectra, are smaller than that of pure anatase TiO2. The first-principle pseudopotential method calculations indicate that Ta5＋ lies in the TiO2 lattice at the interstitial position.展开更多
文摘针对鲁奇炉煤气化废水中酚类污染物难降解而无法满足生化处理的难题,采用热化学法制备钛铱钽催化电极(Ti/IrO2-Ta2O5),并将其作为阳极对鲁奇炉煤气化废水进行电催化降解。结果表明,当电流密度为50 m A/cm2、NaCl质量浓度为9.5 g/L、pH为4、降解时间为180 min时,苯酚和COD的去除率较高,分别可达92%和48%。废水色度极大降低,BOD/COD提高至0.42,降解后的废水可满足生化处理要求。动力学研究表明,废水降解过程符合表观一级反应的动力学规律。
基金Supported by the Fundamental Research Funds for the Central Universities under Grant No 2012QNA03
文摘A novel method for preparing Ta-doped Ti02 via using Ta2 05 as the doping source is proposed. The preparation process combines the hydrothernlal fluorination of Ta2O5 and the subsequent formation of Ta-doped TiO2 sol. The results show that the doped sample annealed at 393 K generates an unstable intermediate NH4 TiOF3, which converts into anatase TiO2 with the increase of temperature. After annealing at ≥673K, the Ta-doped TiO2 nanocrystals with the grain size 〈20nm are obtained. Both the XRD and TG-DSC results confirm that Ta doping prevents the anatase-rutile crystal transition of TiO2. The band gap values of the doped samples, as obtained by UV-vis diffuse reflectance spectra, are smaller than that of pure anatase TiO2. The first-principle pseudopotential method calculations indicate that Ta5＋ lies in the TiO2 lattice at the interstitial position.
