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Superhydrophobic and corrosion-resistant siloxane-modified MgAl-LDHs coatings on magnesium alloy prepared under mild conditions

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 450-463页

作者： Wenxi Zhang Zhangzelong Zhuo Dan Xu Liang Wu Zhihui Xie Chemical Synthesis and pollution control Key Laboratory of Sichuan Province College of Chemistry and Chemical EngineeringChina West Normal UniversityNanchong 637002China College of Materials Science and engineering/National engineering research center for Magnesium Alloys Chongqing UniversityChongqing 400044China

We have developed a superhydrophobic and corrosion-resistant LDH-W/PFDTMS composite coating on the surface of Mg *** composite comprised a tungstate-intercalated(LDH-W)underlayer that was grown at low temperature(relative to hydrothermal reaction conditions)under atmospheric pressure and an outer polysiloxane layer created from a solution containing perfluorodecyltrimethoxysilane(PFDTMS)using a simple immersion *** successful intercalation of tungstate into the LDH phase and the following formation of the polysiloxane layer were confirmed through X-ray diffraction(XRD),Fourier transform infrared(FTIR)spectroscopy,and X-ray photoelectron spectroscopy(XPS).The corrosion resistance of the LDH-W film,both before and after the PFDTMS modification,was evaluated using electrochemical impedance spectroscopy(EIS),Tafel curves,and immersion *** results showed that Mg coated with LDH-W/PFDTMS exhibited significantly enhanced corrosion protection compared to the unmodified LDHW film,with no apparent signs of corrosion after exposure to 3.5wt%NaCl solution for 15 ***,the LDH-W/PFDTMS coating demonstrated superior superhydrophobicity and self-cleaning properties against water and several common beverages,as confirmed by static contact angle and water-repellency *** results offer valuable insights into preparing superhydrophobic and corrosion-resistant LDH-based composite coatings on Mg alloy surfaces under relatively mild reaction conditions.

关键词： Mg alloy corrosion coating layered double hydroxide

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Characterization of changes in extracellular polymeric substances and heavy metal speciation of waste activated sludge during typical oxidation solubilization processes

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Journal of Environmental Sciences 2019年第6期31卷 146-158页

作者： Qiongying Xu Huidi Wang Qiandi Wang Weijun Zhang Dongsheng Wang Faculty of Materials Science and Chemistry China University of Geosciences School of Environmental Studies China University of Geosciences hubei provincial engineering research center of systematic water pollution control State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of Sciences

Biopolymer solubilization is considered to be the rate-limiting stage of anaerobic digestion of waste activated sludge(WAS). Oxidation processes have been proven to be effective in disrupting sludge flocs and causing solubilization of the solid biopolymers. In this study,WAS was treated by NaNO2 or H2 O2 oxidation at p H of 2. The changes in extracellular polymeric substances properties and the speciation of heavy metals were investigated. The results revealed that both NaNO2 and H2 O2 treatments were effective in solubilizing organics in WAS, while the conversion of biopolymers in the two treatment processes was different. Free nitrous acid destroyed the gel network structure of EPS, and organic materials were released from the solid phase to the supernatant. Indigenous peroxidase catalyzed H2 O2 to produce hydroxyl radicals which caused significant solubilization of biopolymers, and the protein-like substances were further degraded into micro-molecule polypeptides or amino acids at high dosages of H2 O2. During the oxidation processes, Zn, Cd and Cu, with excellent mobility, tended to migrate to the supernatant, and thus were easy to remove through the liquid–solid separation process. Ni and As showed moderate migration ability, of which the residual fraction tended to transform into reducible and soluble fractions. With poor mobility, Cr and Pb mainly existed in the forms of residual and oxidizable fractions, which were difficult to dissolve and remove from WAS. Both NaNO2 and H2 O2 treatment resulted in the enhancement of sludge solubilization efficiency and heavy metal mobility in WAS, but different heavy metals showed distinct migration and transformation behaviors.

关键词： Extracellular polymeric substances(EPS) Oxidation Biopolymers solubilization Biodegradability Heavy metals

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Effects of alkalinity on interaction between EPS and hydroxy-aluminum with different speciation in wastewater sludge conditioning with aluminum based inorganic polymer flocculant

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Journal of Environmental Sciences 2021年第2期33卷 257-268页

作者： Weijun Zhang Mingyue Tang Dandan Li Peng Yang Shiwei Xu Dongsheng Wang School of Environmental Studies China University of GeosciencesWuhan 430074China hubei provincial engineering research center of systematic water pollution control Wuhan 430074China School of Civil and Architecture Engineer Northeast Electric Power UniuersityJilin 132012China CECEP engineering Technology research Institution Beijing 100082China

Extracellular polymeric substances(EPS)form a stable gel-like structure to combine with water molecules through steric hindrance,making the mechanical dewatering of wastewater sludge considerably ***/flocculation has been widely applied in improving the sludge dewatering performance,while sludge properties(organic fraction and solution chemistry conditions)are highly changeable and have important effects on sludge flocculation *** this work,the alkalinity effects on sludge conditioning with hydroxy-aluminum were comprehensively investigated,and the interaction mechanisms between EPS and hydroxy-aluminum with different speciation were *** results showed that the effectiveness of hydroxy-aluminum conditioning gradually deteriorated with increase in ***,the polymeric hydroxy-aluminum(Al 13)and highly polymerized hydroxy-aluminum(Al 30)were hydrolysed and converted into amorphous aluminum hydroxide(Al(OH)3),which changed the flocculation mechanism from charge neutralization and complexing adsorption to hydrogen bond ***,both Al 13 and Al 30 showed higher binding capacity for proteins and polysaccharides in EPS than monomeric aluminum and Al(OH)*** 13 and Al 30 coagulation changed the secondary structure of proteins in EPS,which caused a gelation reaction to increase molecular hydrophobicity of proteins and consequently sludge *** study provided a guidance for optimizing the hydroxy-aluminum flocculation conditioning of sludge with high solution alkalinity.

关键词： Coagulation/flocculation Hydroxy-aluminum Hydrolysis reaction Extracellular polymeric substances

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Enhanced CO_2 adsorptive performance of PEI/SBA-15 adsorbent using phosphate ester based surfactants as additives

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Journal of Environmental Sciences 2015年第12期27卷 1-7页

作者： Dandan Cheng Yue Liu Haiqiang Wang Xiaole Weng Zhongbiao Wu Department of Environmental engineering Zhejiang University Zhejiang provincial engineering research center of Industrial Boiler and Furnace Flue Gas pollution control

In this study,a series of polyetherimide/SBA-15： 2-D hexagonal P6 mm,Santa Barbara USA（PEI/SBA-15） adsorbents modified by phosphoric ester based surfactants（including tri（2-ethylhexyl）phosphate（TEP）,bis（2-ethylhexyl） phosphate（BEP） and trimethyl phosphonoacetate（TMPA））were prepared for CO2 *** results indicated that the addition of TEP and BEP had positive effects on CO2 adsorption capacity over PEI/*** particular,the CO2 adsorption amount could be improved by around 20% for 45PEI-5TEP/SBA-15 compared to the additive-free *** could be attributed to the decrease of CO2 diffusion resistance in the PEI bulk network due to the interactions between TEP and loaded PEI molecules,which was further confirmed by adsorption kinetics *** addition,it was also found that the cyclic performance of the TEP-modified adsorbent was better than the surfactant-free *** could be due to two main reasons,based on the results of in situ DRIFT and TG-DSC *** and more importantly,adsorbed CO2 species could be desorbed more rapidly over TEP-modified adsorbent during the thermal desorption ***,the enhanced thermal stability after TEP addition ensured lower degradation of amine groups during adsorption/desorption cycles.

关键词： CO2 adsorption Tri(2-ethylhexyl) phosphate PEI/SBA-15 adsorbent Dispersion Surfactant

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Numerical evaluation of the effectiveness of NO_2 and N_2O_5 generation during the NO ozonation process

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Journal of Environmental Sciences 2016年第3期28卷 51-58页

作者： Haiqiang Wang Zhuokai Zhuang Chenglang Sun Nan Zhao Yue Liu Zhongbiao Wu Department of Environment engineering Zhejiang University Zhejiang provincial engineering research center of Industrial Boiler Furnace Flue Gas Pollution Control

Wet scrubbing combined with ozone oxidation has become a promising technology for simultaneous removal of SO_2 and NO_x in exhaust *** this paper,a new 20-species,76-step detailed kinetic mechanism was proposed between O_3 and NO_*** concentration of N_2O_5 was measured using an in-situ IR *** numerical evaluation results kept good pace with both the public experiment results and our experiment *** reaction parameters for the generation of NO_2 and N_2O_5 during the NO ozonation process were investigated by a numerical simulation *** effect of temperature on producing NO_2 was found to be *** produce NO_2,the optimal residence time was1.25 sec and the molar ratio of O_3/NO about *** the generation of N_2O_5,the residence time should be about 8 sec while the temperature of the exhaust gas should be strictly controlled and the molar ratio of O_3/NO about *** study provided detailed investigations on the reaction parameters of ozonation of NO_x by a numerical simulation method,and the results obtained should be helpful for the design and optimization of ozone oxidation combined with the wet flue gas desulfurization methods（WFGD） method for the removal of NO_x.

关键词： Numerical simulation O_3 NO N_2O_5 In-situ IR spectra

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A porous biochar supported nanoscale zero-valent iron material highly efficient for the simultaneous remediation of cadmium and lead contaminated soil

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Journal of Environmental Sciences 2022年第3期34卷 231-241页

作者： Wei Qian Jing-Yi Liang Wen-Xuan Zhang Shi-Ting Huang Zeng-Hui Diao Guangdong provincial engineering and Technology research center for Agricultural Land pollution Prevention and control Zhongkai University of Agriculture and EngineeringGuangzhou 510225China

Risk associated with heavy metals in soil has been received widespread *** this study,a porous biochar supported nanoscale zero-valent iron(BC-nZVI)was applied to immobilize cadmium(Cd)and lead(Pb)in clayey *** results indicated that the immobilization of Cd or Pb by BC-nZVI process was better than that of BC or nZVI process,and about 80%of heavy metals immobilization was obtained in BC-nZVI *** of BC-nZVI could increase soil pH and organic matter(SOM).Cd or Pb immobilization was inhibited with coexisting organic compound 2,4-dichlorophenol(2,4-DCP),but 2,4-DCP could be removed in a simultaneous manner with Cd or Pb immobilization at low concentration *** immobilization of Cd and Pb was achieved in BC-nZVI process,and both Cd and Pb availability significantly *** Cd species inculding Cd(OH)_(2),CdCO_(3)and CdO were formed,whereas stable Pb species such as PbCO_(3),PbO and Pb(OH)_(2)were produced with BC-nZVI *** immobilization mechanism of Cd and Pb in soil by BC-nZVI was thereby *** study well demonstrates that BC-nZVI has been emerged as a potential technology for the remediation of multiple heavy metals in soil.

关键词： Cadmium(Cd) Lead(Pb) Biochar Nano zero valent iron(nZVI) Contaminated soil

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Preparation of ultrahigh-surface-area sludge biopolymers-based carbon using alkali treatment for organic matters recovery coupled to catalytic pyrolysis

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Journal of Environmental Sciences 2021年第8期33卷 83-96页

作者： Yu Zhang Jiayi Tang Weijun Zhang Jing Ai Yanyang Liu Qiandi Wang Dongsheng Wang School of Environmental Studies China University of GeosciencesWuhan 430074China hubei provincial engineering research center of systematic water pollution control Wuhan 430074China Faculty of Materials Science and Chemistry China University of GeosciencesWuhan 430074China State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco–Environmental SciencesChinese Academy of SciencesBeijing 100085China

In this work,we employed waste activated sludge(WAS)as carbon source to prepare ultrahigh specific surface area(SSA)biopolymers-based carbons(BBCs)through alkali(KOH)treatment coupled to pyrolysis *** the pyrolysis process,the involvement of KOH made a great recovery of soluble biopolymers from WAS,resulting in highly-efficient catalytic *** Brunner-Emmett-Teller and pore volume of BBCs prepared at 800℃(BBC800)reached the maximum at 2633.89 m2·g-1 and 2.919 m3·g-1,respectively.X-ray photoelectron spectroscopy suggested that aromatic carbon in the form of C=C was the dominant fraction of C element in *** N element in BBCs were composed of pyrrolic nitrogen and pyridinic nitrogen at 700℃,while a new graphitic nitrogen appeared over 800℃.As a refractory pollutant of wastewater treatment plants,tetracycline(TC)was selected to evaluate adsorption performance of *** adsorption behavior of BBCs towards TC was conformed to the pseudo-second-order kinetic and the Langmuir models,signifying that chemisorption of monolayers was dominant in TC *** adsorption capacity of BBC800 reached the maximum at 877.19 mg·g-1 for 90 min at 298 *** analysis indicated that the adsorption process was endothermic and *** bonding andπ-πstacking interaction were mainly responsible for TC adsorption,and interfacial diffusion was the main rate-control step in adsorption *** presence of sol-uble microbial products(SMPs)enhanced TC *** work provided a novel strategy to prepare bio-carbon with ultrahigh SSA using WAS for highly-efficient removal of organic pollutants.

关键词： Waste activated sludge Biopolymers-based carbons Adsorption Tetracycline

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Surface reactive species on MnO_x(0.4)-CeO_2 catalysts towards soot oxidation assisted with pulse dielectric barrier discharge

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Journal of Rare Earths 2014年第2期32卷 153-158页

作者：付名利林俊敏朱文波吴军良陈礼敏黄碧纯叶代启 College of Environment and Energy South China University of Technology Guangdong provincial Key Laboratory of Atmospheric Environment and pollution control Guangdong High Education engineering Technology research center for Air pollution control Key Lab of Ministry of Education for pollution control and Ecosystem Restoration in Industry Clusters

MnOx（0.4）-CeO2 was investigated for soot oxidation assisted with a pulse dielectric barrier discharge （DBD）. The catalysts were evaluated and characterized with TPO （temperature programmed oxidation）, X-ray diffraction （XRD）, Raman and X-ray photo- electron spectroscopy （XPS）. The ignition temperature Ti for soot oxidation decreased from 240.8 to 216.4 ℃ with the increase of the pulse DBD frequencies from 50 to 400 Hz, lower than that of the case without pulse DBD present （253.4 ℃）. The results of XRD, Raman and XPS agreed well with the TPO activities of MnOx（0.4）-CeO2 towards soot oxidation. More solid solution of ceria and manganese, and surface reactive species including 02 , O and Mn4＋ were responsible for the enhancement of soot oxidation due to pulse DBD injection in the present study. For solid solution favors to the activation and transformation of those species, which are be- lieved to be involved in the soot oxidation in a hybrid catalysis-plasma.

关键词： diesel soot MnOx(0.4)-Ce02 pulse dielectric barrier discharge reactive species rare earths

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Intensified reactive extraction of 4-hydroxypyridine with di(2-ethylhexyl) phosphoric acid in 1-octanol by using tributyl phosphate

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Chinese Journal of Chemical engineering 2023年第2期54卷 199-205页

作者： Zhixian Chang Xiangfeng Zhou Huihua Bai Deliang Li Ling Zhang Henan provincial engineering research center of Green Anticorrosion Technology for Magnesium Alloys Henan Engineering Research Center for Control and Remediation of Soil Heavy PollutionCollege of Chemistry and Chemical EngineeringHenan UniversityKaifeng 475004China

The efficient separation of amphoteric organic compounds from dilute solutions is of great importance in the industrial field. In the present work, the reactive extractions of 4-hydroxypyridine(4-HP) with tributyl phosphate(TBP), di(2-ethylhexyl) phosphoric acid(D2EHPA) and TBP + D2EHPA dissolved in 1-octanol were investigated, respectively. The influences of the initial concentrations of TBP, D2EHPA and TBP + D2EHPA on distribution ratio(D) were discussed, as well as the reactive extraction mechanism were proposed. The obvious intensification effect was observed when the mixture of TBP and D2EHPA was used as extractant. The best extraction conditions were found to be of the molar ratio of D2EHPA and TBP at 2:1 and the equilibrium aqueous pH at 3.50-4.50. D values increased with the increase of the total concentration of TBP and D2EHPA in 1-octanol. Especially, the analysis on the extraction mechanisms clearly indicate(i) TBP in 1-octanol shows negligible reactive extraction toward 4-HP,(ii) D2EHPA in 1-octanol exhibits moderate extraction effect by forming 4-HP:D2EHPA(1:1) and 4-HP:2D2EHPA(1:2) type complexes, while(iii) D2EHPA in TBP/1-octanol demonstrates the maximum distribution ratio with the 4-HP:D2EHPA(1:1) type complex domination. The discussion provides new insights on the mechanism and opens a new way for the intensified extraction of amphoteric organic compounds by using the mixture of multiple extractants in the diluent.

关键词： 4-Hydroxypyridine Di(2-ethylhexyl)phosphoric acid Tributyl phosphate Reactive extraction Intensified extraction

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Screening study of transition metal oxide catalysts supported on ceria-modified titania for catalytic oxidation of toluene

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Journal of Zhejiang University-Science A(Applied Physics & engineering) 2011年第6期12卷 461-469页

作者： Dan-qing YU Yue LIU Zhong-biao WU Department of Environmental engineering Zhejiang University Hangzhou 310027 China Zhejiang provincial engineering research center of Industrial Boiler & Furnace Flue Gas pollution control Hangzhou 310027 China

Six transition metal oxides were added in ceria-modified titania using a sol-gel method for catalytic oxidation of *** MnOx based catalyst was found to be the most active one,with which toluene could be decomposed completely at 200 *** greatest Mn/Ti and molar ratio of the mobile oxygen to the total oxygen concentration,together with a large surface area and a low reduction peak-starting temperature,would result in its best activity in toluene oxidation.

关键词： Transition metal oxides CeO2/TiO2 Sol-gel method Catalytic oxidation Toluene

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