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catalytic ozonation of NH_(4)^(+)-N in wastewater over composite metal oxide catalyst

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Journal of Rare Earths 2022年第1期40卷 73-84页

作者： Caiqing He Yunnen Chen Lin Guo Ruoyu Yin Tingsheng Qiu Jiangxi Key Laboratory of Mining&Metallurgy Environmental Pollution Control Jiangxi University of Science and TechnologyGanzhou 341000China

Large amounts of water containing-ammonium nitrogen(NH_(4)^(+)-N)have attracted increasing *** ozonation technology,involving the generation of hydroxyl radical(OH)with strong oxidation ability,was originally utilized to degrade organic-containing *** this paper,Ce/MnOx composite metal oxide catalysts prepared with different preparation conditions were used to degrade wastewater containing inorganic pollutant(NH_(4)^(+)-N).The as-prepared catalyst features were characterized using X-ray diffraction(XRD),Brunauer-Emmett-Teller method(BET),scanning electron microscopy(SEM),energy dispersive X-ray spectroscopy(EDS),Fourier transform infrared spectroscopy(FTIR),X-ray photoelectron spectroscopy(XPS)and H_(2)-temperature programmed reduction(H_(2)-TPR)*** results show that the catalyst,prepared by conditions with precipitant Na_(2)CO_(3) and Ce/Mn molar ratio 1:2 calcined at 400℃for 3 h in pH 11.0,displays the optimal performance,with the removal rate of NH_(4)^(+)-N and selectivity to gaseous nitrogen,88.14 wt%and 53.67 wt%,*** effects of several operating factors including solution pH,initial NH_(4)^(+)-N concentrations and scavengers were *** addition,XRD patterns of catalyst with the best performance and the comparative study on decontamination of NH_(4)^(+)-N by various processes(O_(3),catalyst and catalyst/O_(3))show that the primary metal oxides are CeO_(2) and MnO_(2) in Ce/MnOx composite metal oxide catalysts,which have a synergistic effect on the catalytic ozonation of NH_(4)^(+)-N,and the new phase MnO_(2) plays a great *** 5 consecutive use cycles,the degradation efficiency is declined slightly,and can still achieve better than 70 wt%over 1 h ***,the application of catalytic ozonation for actual wastewater on the removal rate of NH_(4)^(+)-N was *** mechanism and degradation pathway of NH_(4)^(+)-N were also *** a word,the application of CeO_(2)-MnO_(2

关键词： Ammonium nitrogen Catalyst Wastewater catalytic ozonation Rare earths

catalytic ozonation in advanced treatment of kitchen wastewater:multi-scale simulation and pilot-scale study

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Frontiers of Environmental Science & Engineering 2023年第12期17卷 47-58页

作者： Zuoyong Zhou Ni Yan Mengxi Yin Tengfei Ren Shuning Chen Kechao Lu Xiaoxin Cao Xia Huang Xiaoyuan Zhang State Key Joint Laboratory of Environment Simulation and Pollution Control School of EnvironmentTsinghua UniversityBeijing 100084China

catalytic ozonation is regarded as a promising technology in the advanced treatment of refractory organic ***-bed reactors are widely used in practical applications due to simple structures,installation and ***,mass transfer of packed-bed reactors is relatively restrained and amplified deviations usually occurred in scale-up ***,a multi-scale packed-bed model of catalytic ozonation was established to guide pilot ***,a laboratory-scale test was conducted to obtain kinetic parameters needed for ***,a multi-scale packed-bed model was developed to research the effects of water distribution structure,catalyst particle size,and hydraulic retention time(HRT)on catalytic *** was found that the performance of packed bed reactor was increased with evenly distributed water inlet,HRT of 60 min,and catalyst diameter of about 3-7 ***,an optimized reactor was manufactured and a pilot-scale test was conducted to treat kitchen wastewater using catalytic ozonation *** the pilot-scale test with an ozone dosage of 50 mg/L and HRT of 60 min,the packed-bed reactor filled with catalysts I was able to reduce chemical oxygen demand(COD)from 117 to 59 mg/*** performance of the catalytic ozonation process in the packed-bed reactor for the advanced treatment of actual kitchen wastewater was investigated via both multi-scale simulation and pilot-scale tests in this study,which provided a practical method for optimizing the reactors of treating refractory organic wastewater.

关键词： catalytic ozonation Multi-scale simulation Pilot-scale study Kitchen wastewater

catalytic ozonation treatment of papermaking wastewater by Ag-doped NiFe2O4 : Performance and mechanism

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Journal of Environmental Sciences 2020年第11期32卷 75-84页

作者： Junyu Zhao Jiashun Cao Yujie Zhao Teng Zhang Di Zheng Chao Li Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes Ministry of EducationHohai UniversityNanjing 210098China College of Environment Hohai UniversityNanjing 210098China China United Engineering Corporation Limited Zhejiang 310000China

The catalytic ozonation treatment of secondary biochemical effluent for papermaking wastewater by Ag-doped nickel ferrite was ***-doped catalysts prepared by sol-gel method were characterized,illustrating that Ag entirely entered the crystalline of Ni Fe2O4 and changed the surface *** addition of catalyst enhanced the removal efficiency of chemical oxygen demand and total organic *** results of gas chromatography-mass spectrometer,ultraviolet light absorbance at 254 nm and threedimensional fluorescence excitation-emission matrix suggested that aromatic compounds were efficiently degraded and toxic substances,such as dibutyl *** addition,the radical scavenging experiments confirmed the hydroxyl radicals acted as the main reactive oxygen species and the surface properties of catalysts played an important role in the ***,this work validated potential applications of Ag-doped Ni Fe2O4 catalyzed ozonation process of biologically recalcitrant wastewater.

关键词： Papermaking wastewater Secondary effluent Nickel ferrite Ag-doping catalytic ozonation

catalytic ozonation of phenol and oxalic acid with copper-loaded activated carbon

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Journal of Central South University 2010年第2期17卷 300-306页

作者：饶义飞罗汉金韦朝海罗凌峰 College of Environmental Science and Engineering South China University of Technology Knox College The Second East South Street

A novel heterogeneous catalytic ozonation process in water treatment was studied, with a copper-loaded activated carbon （Cu/AC） that was prepared by an incipient wetness impregnation method at low temperature and tested as a catalyst in the ozonation of phenol and oxalic acid. Cu/AC was characterized using XRD, BET and SEM techniques. Compared with ozonation alone, the presence of Cu/AC in the ozonation processes significantly improves the degradation of phenol or oxalic acid. With the introduction of the hydroxyl radical scavenger, i.e., turt-butanol alcohol （t-BuOH）, the degradation efficiency of both phenol and oxalic acid in the Cu/AC catalyzed ozonation process decreases by 22% at 30 min. This indicates that Cu/AC accelerates ozone decomposition into certain concentration of hydroxyl radicals. The amount of Cu（II ） produced during the reaction of Cu/AC-catalyzed ozonation of phenol or oxalic acid is very small, which shows that the two processes are both heterogeneous catalytic ozonation reactions.

关键词： copper-loaded activated carbon phenol oxalic acid hydroxyl radical catalytic ozonation

catalytic ozonation-biological coupled processes for the treatment of industrial wastewater containing refractory chlorinated nitroaromatic compounds

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2010年第3期11卷 177-189页

作者： Bing-zhi LI Xiang-yang XU Liang ZHU Department of Environmental Engineering College of Environmental and Resource Sciences Zhejiang University Hangzhou 310029 China

A treatability study of industrial wastewater containing chlorinated nitroaromatic compounds （CNACs） by a catalytic ozonation process （COP） with a modified Mn/Co ceramic catalyst and an aerobic sequencing batch reactor （SBR） was investigated. A preliminary attempt to treat the diluted wastewater with a single SBR resulted in ineffective removal of the color, ammonia, total organic carbon （TOC） and chemical oxygen demand （COD）. Next, COP was applied as a pretreatment in order to obtain a bio-compatible wastewater for SBR treatment in a second step. The effectiveness of the COP pretreatment was assessed by evaluating wastewater biodegradability enhancement （the ratio of biology oxygen demand after 5 d （BOD5） to COD）, as well as monitoring the evolution of TOC, carbon oxidation state （COS）, average oxidation state （AOS）, color, and major pollutant concentrations with reaction time. In the COP, the catalyst preserved its catalytic properties even after 70 reuse cycles, exhibiting good durability and stability. The performance of SBR to treat COP effluent was also examined. At an organic loading rate of 2.0 kg COD/（m^3.d）, with hydraulic retention time （HRT）=10 h and temperature （30±2） ℃, the average removal efficiencies of NH3-N, COD, BOD5, TOC, and color in a coupled COP/SBR process were about 80%, 95.8%, 93.8%, 97.6% and 99.3%, respectively, with average effluent concentrations of 10 mg/L, 128 mg/L, 27.5 mg/L, 25.0 mg/L, and 20 multiples, respectively, which were all consistent with the national standards for secondary discharge of industrial wastewater into a public sewerage system （GB 8978-1996）. The results indicated that the coupling of COP with a biological process was proved to be a technically and economically effective method for treating industrial wastewater containing recalcitrant CNACs.

关键词： Industrial wastewater catalytic ozonation Sequencing batch reactor Chlorinated nitroaromatic compounds

catalytic ozonation of reactive red X-3B in aqueous solution under low pressure： decolorization and OH. generation

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Frontiers of Environmental Science & Engineering 2015年第4期9卷 591-595页

作者： Hong SUN Min SUN Yaobin ZHANG Xie QUAN Key Laboratory of Industrial Ecology and Environmental Engineering (Dalian University of Technology) Ministry of Education School of Environmental Science and Technology Dalian University of Technology Dalian 116024 China

catalytic ozonation of Reactive Red X-3B in aqueous solution had been carried out in an ozone oxidation reactor where Mn-Fe-ceramic honeycomb was used as the catalysts. The presence of Mn-Fe-ceramic honeycomb catalyst could obviously improve the deco- loration efficiency of Reactive Red X-3B and the utilization efficiency of ozone compared to the results from non-catalytic ozonation. Adsorption of Reactive Red X-3B had no obviously influence on the degradation efficiency. Addition of tert-butanol significantly decreased the degradation efficiency, indicating that the degradation of Reactive Red X-3B followed the mechanism of hydroxyl radical （OH.） oxidation. The operating variables such as reaction pressure and ozone supply had a positive influence on the degradation efficiency, mainly attributing to facilitate the ozone decomposition and OH. formation.

关键词： catalytic ozonation reactive red X-3B ceramic honeycomb hydroxyl radical (OH.)

Interlayer-confined two-dimensional manganese oxide-carbon nanotube catalytic ozonation membrane for efficient water purification

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Frontiers of Chemical Science and Engineering 2022年第5期16卷 731-744页

作者： Dean Xu Tong Ding Yuqing Sun Shilong Li Wenheng Jing State Key Laboratory of Materials-Oriented Chemical Engineering Nanjing Tech UniversityNanjing 210009China

catalytic ozonation technology has attracted copious attention in water purification owing to its favorable oxidative degradation of pollutants and mitigation of membrane fouling ***,its extensive industrial application has been restricted by the low ozone utilization and limited mass transfer of the short-lived radical *** space-confined catalysis has been theoretically proven to be a viable strategy for achieving high catalytic ***,a two-dimensional MnO_(2)-incorporated ceramic membrane with tunable interspacing,which was obtained via the intercalation of a carbon nanotube,was designed as a catalytic ozonation membrane reactor for degrading methylene *** from the abundant catalytic active sites on the surface of two-dimensional MnO_(2) as well as the ultralow mass transfer resistance of fluids due to the nanolayer confinement,an excellent mineralization effect,i.e.,1.2 mg O_(3)(aq)mg^(-1) TOC removal(a total organic carbon removal rate of 71.5%),was achieved within a hydraulic retention time of 0.045 s of pollutant ***,the effects of hydraulic retention time and interlayer spacing on methylene blue removal were ***,the mechanism of the catalytic ozonation employing catalytic ozonation membrane was proposed based on the contribution of the Mn(III/IV)redox pair to electron transfer to generate the reactive oxygen *** innovative twodimensional confinement catalytic ozonation membrane could act as a nanoreactor and separator to efficiently oxidize organic pollutants and enhance the control of membrane fouling during water purification.

关键词： catalytic membrane reactor catalytic ozonation nanoconfinement two-dimensional manganese oxide

Fe_(3)C@C/C for catalytic ozonation of silicon-containing wastewater:Dual improvement of silicon resistance and catalytic effect

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Journal of Materials Science & Technology 2023年第5期136卷 65-77页

作者： Shengzhe Wang Lei Ma Rui Wang Chengyu Jin Ying Zhao Xuefei Tan Yanan Zhang Mengyang Liu Chenxing Yao Huangzhao Wei Chenglin Sun Dalian Institute of Chemical Physics Chinese Academy of SciencesDalian 116023China University of Chinese Academy of Sciences Beijing 100049China Beijing Key Laboratory of Fuels Cleaning and Advanced catalytic Emission Reduction Technology/College of Chemical Engineering Beijing Institute of Petrochemical TechnologyBeijing 102617China College of Materials and Chemical Engineering Heilongjiang Institute of TechnologyHarbin 150050China School of Light Industry and Chemical Engineering Dalian Polytechnic UniversityDalian 116034China

The improvement of catalysts’stability under harsh reaction conditions is vital for their practical ***,iron carbide(Fe_(3)C)nanoparticles were encapsulated in graphitic carbon in situ and a carbon ball served as the *** synthesized Fe_(3)C@C/C was first utilized to treat an m-cresol wastewater containing Si via catalytic *** with the commercial Fe/Al_(2)O_(3)catalyst,the resistance to Si of the Fe_(3)C@C/C was improved 22.68 times,while the TOC removal rate increased by a factor of 2.9,and it remained stable during 10 cycles and 12000 min of continuous reaction,which further demon-strated its potential for diverse *** catalyst exhibits improved resistance to Si because of the dual protection from the carbon-encapsulated structure and carbon *** functional theory calculations show that the encapsulation of Fe_(3)C using carbon significantly increases the resistance to adsorption of Si on its active *** addition,the activation of O_(3)is unimpeded on the Fe_(3)C adsorption sites by the protection from C,thus the generation of reactive oxygen species(ROS)by ozone is largely *** mechanism associated with the resistance of the Fe_(3)C@C/C catalyst to Si and its elevated activity are also elucidated.

关键词： catalytic ozonation Silicon-resistant catalyst Carbon-encapsulated Fe_(3)C@C/C Density functional theory

Development, dilemma and potential strategies for the application of nanocatalysts in wastewater catalytic ozonation: A review

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Journal of Environmental Sciences 2023年第2期124卷 330-349页

作者： Xiaoguang Jin Changyong Wu Liya Fu Xiangmiao Tian Panxin Wang Yuexi Zhou Jiane Zuo State Key Laboratory of Environmental Criteria and Risk Assessment Chinese Research Academy of Environmental SciencesBeijing 100012China School of Environment Tsinghua UniversityBeijing 100084China Research Center of Environmental Pollution Control Engineering Technology Chinese Research Academy of Environment SciencesBeijing 100012China

With the continuous development of nanomaterials in recent years,the application of nanocatalysts in catalytic ozone oxidation has attracted more and more researchers’attention due to their excellent catalytic *** this review,we systematically summarized the current research status of nanocatalysts mainly involving material categories,mechanisms and catalytic *** on summary and analysis,we found most of the reported nanocatalysts were in the stage of laboratory research,which was caused by the nanocatalysts defects such as easy aggregation,difficult separation,and easy *** defects might result in severe resource waste,economic loss and potentially adverse effects imposed on the ecosystem and human *** at solving these defects,we further analyzed the reasons and the existing reports,and revealed that coupling nano-catalyst and membrane,supported nanocatalysts and magnetic nanocatalysts had promising potential in solving these problems and promoting the actual application of nanocatalysts in wastewater ***,the advantages,shortages and our perspectives of these methods are summarized and discussed.

关键词： catalytic ozonation Nanocatalyst limitation Membrane Supported nanocatalysts Magnetic nanocatalysts