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Visible-light-driven heterostructured g-C_(3)N_(4)/Bi-TiO_(2) floating photocatalyst with enhanced charge carrier separation for photocatalytic inactivation of Microcystis aeruginosa

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Frontiers of Environmental Science & Engineering 2021年第6期15卷 367-378页

作者： Jingke Song Chenyang Li xuejiang wang Songsong Zhi Xin wang Jianhui Sun School of Environment Key Laboratory for Yellow River and Huai River Water Environment and Pollution Control(Ministry of Education)Henan Key Laboratory for Environmental Pollution ControlHenan Normal UniversityXinxiang 453007China College of Environmental Science and Engineering State Key Laboratory of Pollution Control and Resource ReuseTongji UniversityShanghai 200092China Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials Guangdong Engineering Technology Research Center of Efficient Green Energy and Environment Protection MaterialsSchool of Physics and Telecommunication EngineeringSouth China Normal UniversityGuangzhou 510006China

The increase in occurrence and severity of cyanobacteria blooms is causing increasing concern;moreover,human and animal health is affected by the toxic effects of Microcystin-LR released into the *** this paper,a floating photocatalyst for the photocatalytic inactivation of the harmful algae Microcystis aeruginosa(***)was prepared using a simple sol-gel method,i.e.,coating g-C_(3)N_(4) coupled with Bi-doped TiO_(2) on Al_(2)O_(3)-modified expanded perlite(CBTA for short).The impact of different molar ratios of Bi/Ti on CBTA was *** results indicated that Bi doping in TiO_(2) inhibited photogenerated electron-hole pair *** 6 h of visible light illumination,75.9%of ***(initial concentration=2.7106 cells/L)and 83.7%of Microcystin-LR(initial concentration=100μg/L)could be removed with the addition of 2 g/L CBTA1%(i.e.,Bi/Ti molar ratio=1%).The key reactive oxygen species(ROSs)in the photocatalytic inactivation process are h+and*** induction of the Bi^(4+)/Bi^(3+)species by the incorporation of Bi could narrow the bandgap of TiO_(2),trap electrons,and enhance the stability of CBTA-1%in the solutions with coexisting environmental substances.

关键词： Bi doping Visible light Algal removal Charge carrier separation

Cr(VI) removal from aqueous solution with bamboo charcoal chemically modified by iron and cobalt with the assistance of microwave

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Journal of Environmental Sciences 2013年第9期25卷 1726-1735页

作者： Wei wang xuejiang wang Xin wang Lianzhen Yang Zhen Wu Siqing Xia Jianfu Zhao State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and Engineering Tongji University

Bamboo charcoal （BC） was used as starting material to prepare Co-Fe binary oxideloaded adsorbent （Co-Fe-MBC） through its impregnation in Co（NO3）2 , FeCl3 and HNO3 solutions simultaneously, followed by microwave heating. The low-cost composite was characterized and used as an adsorbent for Cr（VI） removal from water. The results showed that a cobalt and iron binary oxide （CoFe2O4 ） was uniformly formed on the BC through redox reactions. The composite exhibited higher surface area （331 m2/g） than that of BC or BC loaded with Fe alone （Fe-MBC）. The adsorption of Cr（VI） strongly depended on solution pH, temperature and ionic strength. The adsorption isotherms followed the Langmuir isotherm model well, and the maximum adsorption capacities for Cr（VI） at 288 K and pH 5.0 were 35.7 and 51.7 mg/g for Fe-MBC and Co-Fe-MBC, respectively. The adsorption processes were well fitted by the pseudo second-order kinetic model. Thermodynamic parameters showed that the adsorption of Cr（VI） onto both adsorbents was feasible, spontaneous, and exothermic under the studied conditions. The spent Co-Fe-MBC could be readily regenerated for reuse.

关键词： bamboo charcoal microwave adsorption hexavalent chromium

Changes of Cu, Zn, and Ni chemical speciation in sewage sludge co-composted with sodium sulfide and lime

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Journal of Environmental Sciences 2008年第2期20卷 156-160页

作者： wang xuejiang CHEN Ling XIA Siqing ZHAO Jianfu State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and Engineering Tongji University Shanghai 200092 China

A batch composting study was performed to evaluate the feasibility of co-composting sewage sludge with sodium sulfide and lime （SSL） mixture （Na2S/CaO= 1：1）, aiming at reducing the availability of heavy metals in the sludge compost. Sewage sludge with sawdust as a bulking agent was amended with SSL at 3% （w/w, dw）, and composted for 15 d in laboratory batch reactors. The four stages of the Tessier sequential extraction method was employed to investigate changes in heavy metal fractions of Cu, Zn, and Ni in sewage sludge composted with SSL. For all the three metals, the mobile fractions, such as, exchangeable and carbonate bound were mainly transformed into low availability fractions （organic matter and sulfide, Fe-Mn oxides bound and residual forms）, and the addition of SSL enhanced this transformation. Therefore, SSL is a suitable material to co-compost with sewage sludge to reduce the availability of heavy metals. According to the cabbage seed germination test, a SSL amendment of ≤3% （w/w, dw） is recommended to co-compost with sewage sludge.

关键词： sewage sludge co-composting heavy metals sequential extraction

Pb(Ⅱ) removal from water using Fe-coated bamboo charcoal with the assistance of microwaves

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Journal of Environmental Sciences 2013年第5期25卷 1044-1053页

作者： Zengsheng Zhang xuejiang wang Yin wang Siqing Xia Ling Chen Yalei Zhang Jianfu Zhao State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and EngineeringTongji University

Bamboo charcoal（BC） was used as starting material to prepare iron-modified bamboo charcoal（Fe-MBC） by its impregnation in FeCl 3 and HNO 3 solutions simultaneously,followed by microwave *** material can be used as an adsorbent for Pb（Ⅱ） contaminants removal in *** composites were prepared with Fe molar concentration of 0.5,1.0 and 2.0 mol/L and characterized by means of N 2 adsorption-desorption isotherms,X-ray diffraction spectroscopy（XRD）,scanning electron microscopy coupled with energy dispersive X-ray spectrometry（SEM-EDS）,Fourier transform infrared（FT-IR） and point of zero charge（pH pzc） *** adsorption analyses showed that the BET specific surface area and total pore volume increased with iron *** adsorbent with Fe molar concentration of 2 mol/L（2Fe-MBC） exhibited the highest surface area and produced the best pore *** Pb（Ⅱ） adsorption process of 2Fe-MBC and BC were evaluated in batch experiments and 2Fe-MBC showed an excellent adsorption capability for removal Pb（Ⅱ）.The adsorption of Pb（Ⅱ） strongly depended on solution pH,with maximum values at pH *** ionic strength had a significant effect on the adsorption at pH 〈 *** adsorption isotherms followed the Langmuir isotherm model well,and the maximum adsorption capacity for Pb（Ⅱ） was 200.38 mg/g for *** adsorption processes were well fitted by a pseudo second-order kinetic *** parameters showed that the adsorption of Pb（Ⅱ） onto Fe-MBC was feasible,spontaneous,and exothermic under the studied conditions,and the ion exchange mechanism played an significant *** results have important implications for the design of low-cost and effective adsorbents in the removal of Pb（Ⅱ） from wastewater.

关键词： adsorption bamboo charcoal microwave assistance kinetics adsorption isotherms

Biosorption of Direct Black 38 by dried anaerobic granular sludge

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Frontiers of Environmental Science & Engineering 2008年第2期2卷 198-202页

作者： xuejiang wang Siqing XIA Jianfu ZHAO State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China

The biosorption of Direct Black 38 by dried anaerobic granular sludge in a batch system under specific temperatures and initial pH was *** adsorption reaction is pH dependent with higher removal at low *** adsorption equilibrium data fit very well with both Langmuir and Freundlich models in the concentration range of Direct Black 38 at all chosen *** adsorption parameters show that the adsorption of Direct Black 38 is an endothermic and more effective process at high *** kinetics of adsorption was found to be second order and adsorption rate constants increased with increasing *** energy was determined as 26.8 kJ/mol for the *** suggests that the adsorption of Direct Black 38 by dried anaerobic granular sludge is chemically controlled.

关键词： biosorption kinetics adsorption isotherms anaerobic granular sludge

Reduction of hexavalent chromium with scrap iron in a fixed bed reactor

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Frontiers of Environmental Science & Engineering 2012年第6期6卷 761-769页

作者： Yin wang xuejiang wang Xin wang Mian LIU Siqing XIA Daqiang YIN Yalei ZHANG Jianfu ZHAO State Key Laboratory of Pollution Control and Resources Reuse College of Environmental Science and EngineeringTongji UniversityShanghai 200092China

The reduction of hexavalent chromium by scrap iron was investigated in continuous long-term fixed bed system. The effects of pH, empty bed contact time （EBCT）, and initial Cr（VI） concentration on Cr（VI） reduction were studied. The results showed that the pH, EBCT, and initial Cr（VI） concentration significantly affected the reduction capacity of scrap iron. The reduction capacity of scrap iron were 4.56, 1.51, and 0.57mg Cr（VI）-g1 Fe0 at pH 3, 5, and 7 （initial Cr（VI） concentration 4 mg.L 1, EBCT 2 min, and temperature 25℃）, 0.51, 1.51, and 2.85 mg Cr（VI）.g-I Fe0 at EBCTs of 0.5, 2.0, and 6.0rain （initial Cr（VI） concentration 4mg.L-1, pH 5, and temperature 25℃）, and 2.99, 1.51, and 1.01 mg Cr（VI）. gl Fe0 at influent concentrations of 1, 4, and 8 mg.L ^-1（EBCT 2 min, pH 5, and temperature 25℃）, respectively. Fe（total） concentration in the column effluent continuously decreased in time, due to a decrease in time of the iron corrosion rate. The fixed bed reactor can be readily used for the treatment of drinking water containing low amounts of Cr（VI） ions, although the hardness and humic acid in water may shorten the lifetime of the reactor, the reduction capacity of scrap iron still achieved 1.98 mg Cr6 ＋- g-~ Fe. Scanning electron micro- scope equipped with energy dispersion spectrometer and X-ray diffraction were conducted to examine the surface species of the scrap iron before and after its use. In addition to iron oxides and hydroxide species, iron-chromium complex was also observed on the reacted scrap iron.

关键词： hexavalent chromium scrap iron reductioncapacity drinking water

Relationships between hemorrhage, angioarchitectural factors and collagen of arteriovenous malformations

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Neuroscience Bulletin 2012年第5期28卷 595-605页

作者： Hongchuan Niu Yong Cao xuejiang wang Xiaowei Xue Lanbing Yu Ming Yang Rong wang Department of Neurosurgery Beijing Tiantan Hospital affiliated to Capital Medical University Beijing 100050 China Department of Physiology and Pathophysiology School of Basic Medical Science Capital Medical University Beijing 100050 China

Objective While associations between the angioarchitecture of arteriovenous malformations （AVMs） in the brain and pathological features have been described, here we investigated the relationship between the angioarchitecture, the pathological features of the vessel wall, and hemorrhagic events. Methods The study was conducted on 43 patients： 16 with ruptured AVM （rAVM）, 15 with non-ruptured AVM （nrAVM）, 6 with craniocerebral trauma （control） and 6 with epilepsy （control）. The diagnosis of AVM was confirmed by preoperative digital subtraction angiography. Tissues were stained with hematoxylin and eosin and Masson＇s trichrome （for collagen fibers） to evaluate the vessel wall structure and endothelial integrity. The content and distribution of collagen types I and III in the vessel wall were assessed by immunohistochemical staining. Results In the nrAVM group, the nidus had more draining veins than the rAVM group （P 〈0.05）. Severely damaged endothelial cells, significantly fewer smooth muscle cells in the media, and hyperplasic type-I and -III collagen fibers were found in the rAVM group. The content of collagen types I and III in rAVMs was higher than that in the nrAVM （P 〈0.05） and control groups （P 〈0.01）. Conclusion There is an association between angioarchitectural features such as the number of draining veins and the pathological structure of the AVM wall. These abnormalities may contribute to AVM rupture.

关键词： arteriovenous malformations angioarchitecture pathology

漂浮型Ag_(2)CrO_(4)-g-C_(3)N_(4)-TiO_(2)/膨胀珍珠岩可见光催化材料除藻性能

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复合材料学报 2021年第6期38卷 1914-1921页

作者：宋靖珂王学江王佳忆王鑫河南师范大学环境学院黄淮水环境与污染防治教育部重点实验室河南省环境污染控制重点实验室新乡453007 同济大学环境科学与工程学院污染控制与资源化国家重点实验室上海200092 华南师范大学物理与电信工程学院广东省高效绿色能源与环保材料工程技术研究中心广东省量子调控工程与材料重点实验室广州510006

以Al_(2)O_(3)改性的膨胀珍珠岩(mEP)为载体,采用溶胶凝胶-浸渍沉积法制备Ag_(2)CrO_(4)-g-C_(3)N_(4)-TiO_(2)/mEP漂浮型可见光催化材料。对制备的光催化材料使用XRD、N2吸附/脱附、FESEM-EDS、XPS和UV-vis DRS等分析方法进行材料表征... 详细信息

以Al_(2)O_(3)改性的膨胀珍珠岩(mEP)为载体,采用溶胶凝胶-浸渍沉积法制备Ag_(2)CrO_(4)-g-C_(3)N_(4)-TiO_(2)/mEP漂浮型可见光催化材料。对制备的光催化材料使用XRD、N2吸附/脱附、FESEM-EDS、XPS和UV-vis DRS等分析方法进行材料表征。实验结果表明,不同的Ag_(2)CrO_(4)含量可对复合催化剂的晶型和比表面积产生影响,过高的Ag_(2)CrO_(4)可在催化剂的表面形成团聚颗粒不利于催化剂对藻细胞的吸附和光催化灭活。以铜绿微囊藻为处理对象,光催化剂中Ag_(2)CrO_(4)/TiO_(2)的理论摩尔比为0.05,初始藻细胞浓度为2.75×10^(6) cells/mL时,单纯暗吸附8 h藻细胞的去除率为10.3%,在吸附和光催化的协同作用下,藻细胞的去除率可达81.88%。光催化除藻过程中起主要作用的为光生空穴h^(+),该催化剂在重复利用三次后对藻细胞仍有72.19%的去除率,催化剂有较好的稳定性。

关键词： Ag_(2)CrO_(4) g-C_(3)N_(4) 可见光催化漂浮除藻

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漂浮型光催化剂制备及其除藻性能初探

同济大学学报（自然科学版） 2016年第9期44卷 1424-1429页

作者：王鑫王学江张晶赵建夫同济大学污染控制与资源化研究国家重点实验室上海200092

以膨胀石墨为载体,蔗糖为外覆炭层前驱物,采用溶胶-炭化一步制备膨胀石墨复合炭基氮、磷共掺杂二氧化钛复合材料(NPT-EGC),通过场发射扫描电子显微镜(FESEM)、氮吸附比表面积及孔容孔径分析仪(BET)、X射线衍射仪(XRD)、紫外-可见漫反射... 详细信息

以膨胀石墨为载体,蔗糖为外覆炭层前驱物,采用溶胶-炭化一步制备膨胀石墨复合炭基氮、磷共掺杂二氧化钛复合材料(NPT-EGC),通过场发射扫描电子显微镜(FESEM)、氮吸附比表面积及孔容孔径分析仪(BET)、X射线衍射仪(XRD)、紫外-可见漫反射光谱仪(UV-vis DRS)、X射线光电能谱仪(XPS)和傅里叶变换红外光谱仪(FT-IR)等分析手段进行材料表征,考察不同煅烧温度制备的材料的除藻性能.实验结果表明,NPT-EGC复合材料具有蠕虫状的空间结构,表面覆有均匀的二氧化钛颗粒.氮、磷以掺杂的方式进入二氧化钛晶格,其中氮主要通过取代氧的方式,而磷主要通过取代钛的方式.掺杂后复合材料的光能吸收率明显提高.考察不同煅烧温度下制备的NPT-EGC材料对铜绿微囊藻的去除性能发现,相对于无催化剂和无光催化负载的情况,复合材料NPT-EGC的除藻性能有明显提高,其中以450℃下制备的NPT-EGC除藻效果最好,9h的藻细胞去除率在98%以上.另外,漂浮型的材料易被分离回收,更有利于光能转化,在环境污染治理中应用前景广阔.

关键词：膨胀石墨二氧化钛漂浮可见光催化铜绿微囊藻