α-Fe_2O_3/煤矸石复合光催化剂的制备及其降解五氯酚性能的研究
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摘要
以Fe(NO_3)_3、煤矸石和NaOH为原料,采用沸腾回流法制得了一系列不同质量比的α-Fe_2O_3/煤矸石复合光催化剂。采用场发射扫描电子显微镜(FESEM)、X射线衍射仪(XRD)及紫外-可见漫反射光谱(UV-Vis DRS)等多种手段对产物做了表征。以五氯酚为目标降解物,考察了模拟太阳光照下样品的光催化效果。结果表明,将球形α-Fe_2O_3负载于改性煤矸石表面可有效提高其光催化活性,且α-Fe_2O_3/煤矸石复合光催化剂的性能与α-Fe_2O_3的含量有关,当α-Fe_2O_3与煤矸石的质量比为30∶100时,样品的光催化效果最佳,180 min内即可将五氯酚降解完全。此外,α-Fe_2O_3/煤矸石复合光催化剂还具有可重复使用的特点。
Using ferric nitrate,coal gangue and sodium hydroxide as the raw materials,α-Fe_2O_3/coal gangue composite photocatalysts with different mass ratios of α-Fe_2O_3 were successfully prepared by boiling reflux method.Field emission scanning electron microscopy(FESEM),X-ray powder diffraction(XRD) and UV-Vis diffuse reflectance spectra(UV-Vis DRS) were used to characterize the products.The photocatalytic activity of as-prepared samples was investigated for degradation of pentachlorophenol under simulated sunlight.The results indicated that loading spherical α-Fe_2O_3 composite on the surface of modified coal gangue could effectively improve its catalytic activity,and there was a close relationship between the photocatalytic performance of α-Fe_2O_3/coal gangue composites and the content of α-Fe_2O_3.When the mass ratio of α-Fe_2O_3 to coal gangue was 30∶100,α-Fe_2O_3/coal gangue composite photocatalyst showed the highest performance and pentachlorophenol was almost completely degraded within 180 min.In addition,this kind of catalyst could be used repeatedly.
Using ferric nitrate,coal gangue and sodium hydroxide as the raw materials,α-Fe_2O_3/coal gangue composite photocatalysts with different mass ratios of α-Fe_2O_3 were successfully prepared by boiling reflux method.Field emission scanning electron microscopy(FESEM),X-ray powder diffraction(XRD) and UV-Vis diffuse reflectance spectra(UV-Vis DRS) were used to characterize the products.The photocatalytic activity of as-prepared samples was investigated for degradation of pentachlorophenol under simulated sunlight.The results indicated that loading spherical α-Fe_2O_3 composite on the surface of modified coal gangue could effectively improve its catalytic activity,and there was a close relationship between the photocatalytic performance of α-Fe_2O_3/coal gangue composites and the content of α-Fe_2O_3.When the mass ratio of α-Fe_2O_3 to coal gangue was 30∶100,α-Fe_2O_3/coal gangue composite photocatalyst showed the highest performance and pentachlorophenol was almost completely degraded within 180 min.In addition,this kind of catalyst could be used repeatedly.
引文
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[2]Jiao Y,Liu Y,Qu F Y,et al.Visible-light-driven photocatalytic properties of simply synthesizedα-iron(Ⅲ)oxide nanourchins[J].J.Colloid Interface Sci.,2015,451:93-100.
[3]He L M,Jing L Q,Luan Y B,et al.Enhanced visible activities ofα-Fe2O3by coupling N-doped graphene and mechanism insight[J].ACS Catal.,2014,4(3):990-998.
[4]王丹萍,李巧玲.水热法制备改性煤矸石/TiO2复合光催化材料的催化性能[J].化工中间体,2014(5):56-60.
[5]王丹萍,李巧玲,费少雷,等.改性煤矸石/TiO2复合材料的制备及其光催化性能[J].化工新型材料,2016,44(1):52-54.
[6]李燕,孙道胜,王爱国,等.CdS/矸石复合粉的声化学法制备及光催化性能[J].人工晶体学报,2015,44(3):717-721.
[7]李燕,杨旭光,孙道胜,等.铋基碘氧化物/煤矸石复合粉体的制备及光催化性能[J].人工晶体学报,2016,45(2):430-434.
[8]Quan X,Ruan X L,Zhao H M,et al.Photoelectrocatalytic degradation of pentachlorophenol in aqueous solution using a TiO2nanotube film electrode[J].Environ.Pollut.,2007,147(2):409-414.
[9]孙统才.可回收纳米吸附催化材料煤矸石/Fe3O4@Ti O2的制备及其表征[D].太原:中北大学,2016.
[10]陈江华.改性煤矸石的制备及对废水中Cr(Ⅵ)的吸附性能研究[J].山西煤炭,2013,33(11):27-28.
[11]郭旭颖,董艳荣,狄军贞,等.改性煤矸石对煤矿酸性废水中Fe2+、Mn2+的吸附[J].非金属矿,2017,40(2):83-87.
[12]范立群,李正炎,杨丽娜.煤矸石的改性及其对废水中Pb2+的吸附性能研究[J].青岛理工大学学报,2010,31(3):64-68.
[13]张铁军,宋矗森,陈莉荣,等.煤矸石复合吸附剂对Zn2+的吸附性能[J].环境保护科学,2016,42(5):96-101.
[14]周昭.α-Fe2O3/ZnO复合物的制备及其光催化性能研究[D].石家庄:河北师范大学,2015.