以硝酸铋和氯化钾为原料,乙二醇为溶剂制备了BiOCl光催化剂。通过XRD,SEM和DRS对其结构、形貌和光吸收性能进行了表征。结果表明所得BiOCl为纯相四方晶系晶体,呈花球状,且带隙能为3.26 e V。以苯酚为目标物考察了BiOCl的光催化活性。在3...以硝酸铋和氯化钾为原料,乙二醇为溶剂制备了BiOCl光催化剂。通过XRD,SEM和DRS对其结构、形貌和光吸收性能进行了表征。结果表明所得BiOCl为纯相四方晶系晶体,呈花球状,且带隙能为3.26 e V。以苯酚为目标物考察了BiOCl的光催化活性。在365 nm单波长光照射600 min后,苯酚的降解率达到了75%,但其矿化率只达到14.8%。这表明苯酚特征衍射峰强度的消失并不表明其被完全矿化。通过质谱分析,对苯酚的光催化反应机理进行了初步探究。展开更多
以钙基蒙脱石(Ca-MMT)为原料,采用一步层间模板法制备了Fe_(3)O_(4)@硅柱撑蒙脱石催化剂(Fe_(3)O_(4)@SPC)。通过XRD、FTIR、BET、SEM、TEM对其结构、形貌进行了表征,以苯酚为目标降解污染物,考察了Fe_(3)O_(4)@SPC的催化活性和稳定性,...以钙基蒙脱石(Ca-MMT)为原料,采用一步层间模板法制备了Fe_(3)O_(4)@硅柱撑蒙脱石催化剂(Fe_(3)O_(4)@SPC)。通过XRD、FTIR、BET、SEM、TEM对其结构、形貌进行了表征,以苯酚为目标降解污染物,考察了Fe_(3)O_(4)@SPC的催化活性和稳定性,并推测了苯酚可能的降解路径。结果显示,Fe_(3)O_(4)@SPC晶面间距(d;)为3.30 nm,介孔平均孔径为4.47 nm,Fe_(3)O_(4)粒子主要分散在SPC的外表面。在苯酚质量浓度为0.10 g/L的100 m L溶液中,pH为2.5,催化剂质量浓度为0.5 g/L,H_(3)O_(4)投加量为0.20 m L,反应时间为120 min的最优条件下,苯酚的去除率为100%;催化剂经过5次循环使用后,苯酚的降解率仍保持在91.80%。通过GC-MS分析苯酚降解生成的中间体,结合叔丁醇猝灭实验发现,·OH氧化在非均相类芬顿催化氧化降解苯酚体系中起主导作用。展开更多
The utilization of perovskite oxide materials as catalysts for the photodegradation of organic pollutants in water is a promising and rapidly advancing field.In this study,a series of La_(1−x)Ba_(x)CoO_(3)(x=0.2,0.3,0...The utilization of perovskite oxide materials as catalysts for the photodegradation of organic pollutants in water is a promising and rapidly advancing field.In this study,a series of La_(1−x)Ba_(x)CoO_(3)(x=0.2,0.3,0.4,0.5,0.6)catalysts with varying Ba doping ratios were synthesized using the citric acid complexation-hydrothermal synthesis combined method for the degradation of phenol under visible light irradiation.Among the synthesized catalysts,La_(0.5)Ba_(0.5)CoO_(3) exhibited the highest photocatalytic activity.In addition,the photocatalytic mechanism for La_(0.5)Ba_(0.5)CoO_(3) perovskite degradation of phenol was also discussed.The synthesized catalysts were characterized using XRD,SEM,FT-IR,XPS,MPMS and other characterization techniques.The results revealed that the diffraction peak intensity of La_(1−x)Ba_(x)CoO_(3) increased with higher Ba doping ratios,and the La_(0.4)Ba_(0.6)CoO_(3) exhibited the strongest diffraction peaks.The catalyst particle sizes ranged from 10 to 50 nm,and the specific surface area decreased with increasing Ba content.Additionally,the paramagnetic properties of La_(0.5)Ba_(0.5)CoO_(3) were similar to that of La_(0.4)Ba_(0.6)CoO_(3).The experimental results suggested that the incorporation of Ba could significantly improve the catalytic performance of La_(1−x)Ba_(x)CoO_(3) perovskites,promote electron transfer and favor to the generation of hydroxyl radicals(•OH),leading to the efficiently degradation of phenol.展开更多
研究了双介质阻挡放电降解苯酚废水过程中不同因素对苯酚降解效果的影响,确定了最佳反应条件,并初步探讨其反应机理。采用自制双介质阻挡放电反应器,以模拟苯酚废水为研究对象,研究了苯酚废水浓度、输入电压、废水曝气量、反应时间等因...研究了双介质阻挡放电降解苯酚废水过程中不同因素对苯酚降解效果的影响,确定了最佳反应条件,并初步探讨其反应机理。采用自制双介质阻挡放电反应器,以模拟苯酚废水为研究对象,研究了苯酚废水浓度、输入电压、废水曝气量、反应时间等因素对苯酚降解效率的影响。结果表明:输入电压为5 k V,曝气气水比为40∶1,反应时间60 min,降解质量浓度为200 mg/L的模拟苯酚废水,苯酚最大去除率达到95.3%;其中苯酚废水浓度、输入电压、曝气气水比对试验结果影响较大。展开更多
Here we reported an effective method to solve the rate-limiting steps, such as the reduction of Fe^(3+) to Fe^(2+) and an invalid decomposition of H2O2 in a conventional Fenton-like reaction. A magnetic heterogeneous ...Here we reported an effective method to solve the rate-limiting steps, such as the reduction of Fe^(3+) to Fe^(2+) and an invalid decomposition of H2O2 in a conventional Fenton-like reaction. A magnetic heterogeneous photocatalyst, Fe3O4-schwertmannite(Fe3O4-sch) was successfully developed by adding Fe3O4 in the formation process of schwertmannite. Fe3O4-sch shows excellent electrons transfer ability and high utilization efficiency of H2O2(98.5%). The catalytic activity of Fe3O4-sch was studied through the degradation of phenol in the heterogeneous photo-Fenton process. Phenol degradation at a wide pH(3-9) was up to 98% within 6 min under visible light illumination with the Fe3O4-sch as heterogeneous Fenton catalyst, which was higher than that using pure schwertmannite or Fe3O4. The excellent photocatalytic performance of Fe3O4-sch is ascribed to the effective recycling between ≡Fe^(3+) and ≡Fe^(2+) by the photo-generated electron, and also profit from the formation of the "Z-Scheme" system. According to the relevant data, photocatalytic mechanism of Fe3O4-sch for degrading phenol was proposed. This study not only provides an efficient way of enhancing heterogeneous Fenton reaction, but also gives potential application for iron oxyhydroxysulfate mineral.展开更多
文摘以硝酸铋和氯化钾为原料,乙二醇为溶剂制备了BiOCl光催化剂。通过XRD,SEM和DRS对其结构、形貌和光吸收性能进行了表征。结果表明所得BiOCl为纯相四方晶系晶体,呈花球状,且带隙能为3.26 e V。以苯酚为目标物考察了BiOCl的光催化活性。在365 nm单波长光照射600 min后,苯酚的降解率达到了75%,但其矿化率只达到14.8%。这表明苯酚特征衍射峰强度的消失并不表明其被完全矿化。通过质谱分析,对苯酚的光催化反应机理进行了初步探究。
文摘以钙基蒙脱石(Ca-MMT)为原料,采用一步层间模板法制备了Fe_(3)O_(4)@硅柱撑蒙脱石催化剂(Fe_(3)O_(4)@SPC)。通过XRD、FTIR、BET、SEM、TEM对其结构、形貌进行了表征,以苯酚为目标降解污染物,考察了Fe_(3)O_(4)@SPC的催化活性和稳定性,并推测了苯酚可能的降解路径。结果显示,Fe_(3)O_(4)@SPC晶面间距(d;)为3.30 nm,介孔平均孔径为4.47 nm,Fe_(3)O_(4)粒子主要分散在SPC的外表面。在苯酚质量浓度为0.10 g/L的100 m L溶液中,pH为2.5,催化剂质量浓度为0.5 g/L,H_(3)O_(4)投加量为0.20 m L,反应时间为120 min的最优条件下,苯酚的去除率为100%;催化剂经过5次循环使用后,苯酚的降解率仍保持在91.80%。通过GC-MS分析苯酚降解生成的中间体,结合叔丁醇猝灭实验发现,·OH氧化在非均相类芬顿催化氧化降解苯酚体系中起主导作用。
文摘通过水解法制备TiO_2纳米颗粒,与经过超声处理后的MoS_2片层纳米材料复合制备MoS_2/TiO_2纳米催化剂,考察不同MoS_2负载量对其光催化降解苯酚效率及路径的影响。XRD、SEM、EDS、FT-IR和UV-vis DRS等表征结果表明,复合催化剂主要由锐钛矿型TiO_2和MoS_2组成;剥离后的MoS_2呈现薄片层状结构,均匀地分散在TiO_2纳米颗粒当中。光催化降解苯酚性能测试结果显示,对于MoS_2/TiO_2催化剂,MoS_2负载量的提高有利于光催化降解苯酚效率的提高;当MoS_2负载量为27%时,复合M o S2/TiO_2纳米颗粒的光催化性能最佳,反应80 min后可将苯酚完全降解。通过对苯酚降解过程中生成中间产物跟踪发现,MoS_2负载量的提高有利于促进中间产物苯醌、对苯二酚以及邻苯二酚的生成,进而提升了MoS_2/TiO_2复合材料的光催化性能。
基金The Fundamental Research Program for Young Scientists of Shanxi Province(Project No.202103021223294)The Fundamental Research Program of Shanxi Province(Project No.202203021211203)+1 种基金The Start-up Fund for Doctorate Scientific Research Project of Taiyuan University of Science and Technology(Project No.20232124)The Innovation and Entrepreneurship Training Program for Undergraduate,Taiyuan University of Science and Technology(Project No.DCX2024162).
文摘The utilization of perovskite oxide materials as catalysts for the photodegradation of organic pollutants in water is a promising and rapidly advancing field.In this study,a series of La_(1−x)Ba_(x)CoO_(3)(x=0.2,0.3,0.4,0.5,0.6)catalysts with varying Ba doping ratios were synthesized using the citric acid complexation-hydrothermal synthesis combined method for the degradation of phenol under visible light irradiation.Among the synthesized catalysts,La_(0.5)Ba_(0.5)CoO_(3) exhibited the highest photocatalytic activity.In addition,the photocatalytic mechanism for La_(0.5)Ba_(0.5)CoO_(3) perovskite degradation of phenol was also discussed.The synthesized catalysts were characterized using XRD,SEM,FT-IR,XPS,MPMS and other characterization techniques.The results revealed that the diffraction peak intensity of La_(1−x)Ba_(x)CoO_(3) increased with higher Ba doping ratios,and the La_(0.4)Ba_(0.6)CoO_(3) exhibited the strongest diffraction peaks.The catalyst particle sizes ranged from 10 to 50 nm,and the specific surface area decreased with increasing Ba content.Additionally,the paramagnetic properties of La_(0.5)Ba_(0.5)CoO_(3) were similar to that of La_(0.4)Ba_(0.6)CoO_(3).The experimental results suggested that the incorporation of Ba could significantly improve the catalytic performance of La_(1−x)Ba_(x)CoO_(3) perovskites,promote electron transfer and favor to the generation of hydroxyl radicals(•OH),leading to the efficiently degradation of phenol.
文摘研究了双介质阻挡放电降解苯酚废水过程中不同因素对苯酚降解效果的影响,确定了最佳反应条件,并初步探讨其反应机理。采用自制双介质阻挡放电反应器,以模拟苯酚废水为研究对象,研究了苯酚废水浓度、输入电压、废水曝气量、反应时间等因素对苯酚降解效率的影响。结果表明:输入电压为5 k V,曝气气水比为40∶1,反应时间60 min,降解质量浓度为200 mg/L的模拟苯酚废水,苯酚最大去除率达到95.3%;其中苯酚废水浓度、输入电压、曝气气水比对试验结果影响较大。
基金supported by National Natural Science Foun-dation of China (Nos. 21637003 and 41977338)。
文摘Here we reported an effective method to solve the rate-limiting steps, such as the reduction of Fe^(3+) to Fe^(2+) and an invalid decomposition of H2O2 in a conventional Fenton-like reaction. A magnetic heterogeneous photocatalyst, Fe3O4-schwertmannite(Fe3O4-sch) was successfully developed by adding Fe3O4 in the formation process of schwertmannite. Fe3O4-sch shows excellent electrons transfer ability and high utilization efficiency of H2O2(98.5%). The catalytic activity of Fe3O4-sch was studied through the degradation of phenol in the heterogeneous photo-Fenton process. Phenol degradation at a wide pH(3-9) was up to 98% within 6 min under visible light illumination with the Fe3O4-sch as heterogeneous Fenton catalyst, which was higher than that using pure schwertmannite or Fe3O4. The excellent photocatalytic performance of Fe3O4-sch is ascribed to the effective recycling between ≡Fe^(3+) and ≡Fe^(2+) by the photo-generated electron, and also profit from the formation of the "Z-Scheme" system. According to the relevant data, photocatalytic mechanism of Fe3O4-sch for degrading phenol was proposed. This study not only provides an efficient way of enhancing heterogeneous Fenton reaction, but also gives potential application for iron oxyhydroxysulfate mineral.
