Department of Environmental Engineering, Zhejiang University, Yuhangtang Road 866, Hangzhou, Zhejiang 310058, China.
Department of Environmental Engineering, Zhejiang University, Yuhangtang Road 866, Hangzhou, Zhejiang 310058, China.
J Environ Sci (China). 2016 Sep;47:63-70. doi: 10.1016/j.jes.2015.11.030. Epub 2016 Mar 24.
A waste paper sludge-derived heterogeneous catalyst (WPS-Fe-350) was synthesized via a facile method and successfully applied for the degradation of Orange II in the presence of oxalic acid under the illumination of ultraviolet light emitting diode (UV-LED) Powder X-ray diffraction, Fourier-transform infrared spectroscopy, scanning electronic microscopy and N2 sorption isotherm analysis indicated the formation of α-Fe2O3 in the mesoporous nanocomposite. The degradation test showed that WPS-Fe-350 exhibited rapid Orange II (OII) degradation and mineralization in the presence of oxalic acid under the illumination of UV-LED. The effects of pH, oxalic acid concentration and dosage of the catalyst on the degradation of OII were evaluated, respectively. Under the optimal conditions (1g/L catalyst dosage, 2mmol/L oxalic acid and pH3.0), the degradation percentage for a solution containing 30mg/L OII reached 83.4% under illumination by UV-LED for 80min. Moreover, five cyclic tests for OII degradation suggested that WPS-Fe-350 exhibited excellent stability of catalytic activity. Hence, this study provides an alternative environmentally friendly way to reuse waste paper sludge and an effective and economically viable method for degradation of azo dyes and other refractory organic pollutants in water.
一种通过简便方法合成的废 paper 污泥衍生的多相催化剂（WPS-Fe-350），并在紫外发光二极管（UV-LED）照射下成功应用于草酸存在下 Orange II 的降解。粉末 X 射线衍射、傅里叶变换红外光谱、扫描电子显微镜和 N2 吸附等温线分析表明，介孔纳米复合材料中形成了α-Fe2O3。降解试验表明，在 UV-LED 照射下，WPS-Fe-350 在草酸存在下对 Orange II（OII）表现出快速降解和矿化作用。分别考察了 pH 值、草酸浓度和催化剂用量对 OII 降解的影响。在最佳条件下（催化剂用量 1g/L、草酸浓度 2mmol/L 和 pH 值 3.0），在 UV-LED 照射 80min 后，浓度为 30mg/L 的 OII 溶液的降解率达到 83.4%。此外，五次 OII 降解循环试验表明，WPS-Fe-350 表现出优异的催化活性稳定性。因此，本研究为废纸污泥的再利用提供了一种替代的环保方法，为水中偶氮染料和其他难降解有机污染物的降解提供了一种有效且经济可行的方法。
