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Pretreatment of heterocyclic pesticide wastewater using ultrasonic/ozone combined process

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Journal of Environmental Sciences 2011年第5期23卷 725-730页

作者： Zhenglong Xiong xiang Cheng Dezhi sun College of Environmental Science & Engineering Beijing Forestry University Beijing 100083 China

Ultrasonic/O3 combined process was employed to pretreat heterocyclic pesticide wastewater for increasing biodegradability and reducing biological toxicity. Influences of ultrasonic frequency, ultrasonic power, probe diameter, initial pH and 03 dosage on the COD removal were studied. The results showed that the ultrasonic/O3 process significantly improved the biodegradability and reduced the biological toxicity of the wastewater. The ratio of BODs/COD was increased from 0.03 to 0.55 and the EC50 increased from 11% to 52% under ultrasonic/O3 treatment. Low ultrasonic frequency brought better COD removal. Initial pH was found to have a high influence on the COD removal and alkaline conditions were more favorable. The influences of ultrasonic power and probe diameter were small. With an increase in O3 dosage, COD removal was effectively improved. The optimal operational parameters for the combined process on COD removal were ultrasonic frequency 20 kHz, initial pH 9.00, ultrasonic power 300 W and dosage of O3 454.8 mg/（***）, under which the efficiency of COD removal reached 67.2%.

关键词： heterocyclic pesticide wastewater ultrasonic O3 BOD5/COD biological toxicity

Enhancement of photocatalytic efficiency by in situ fabrication of BiOBr/BiVO_4 surface junctions

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Journal of Environmental Sciences 2017年第10期29卷 78-83页

作者： Wenzong Yin xiang sun Wenzhong Wang State Key Laboratory of High Performance Ceramics and Superfine Microstructure Shanghai Institute of Ceramics Chinese Academy of Sciences

Surface junctions between Bi OBr and BiVO4 were synthesized. The BiOBr/BiVO4 with 1 wt.%of Bi OBr exhibited the highest photocatalytic activity in the degradation of Rh B under visible-light irradiation. It was found that the highly efficient adsorption of Rh B molecules via the electrostatic attraction between Br-and cationic ／N（Et）2 group played a key role for the high photocatalytic activities of BiOBr/BiVO4. This efficient adsorption promoted the N-deethylation of Rh B and thus accelerated the photocatalytic degradation of Rh ***, the metal-to-metal charge transfer（MMCT） mechanism was proposed, which revealed the concrete path paved with Bi–O–Bi chains for the carrier migration in BiOBr/BiVO4. The interaction between photoexcited Rh B＊ and the Bi^（3＋） in BiVO4 provided the driving force for the migration of photo-generated carriers along the Bi–O–Bi chains. This work has not only demonstrated the important role of efficient adsorption in the photocatalytic degradation of organic contaminants, but also developed a facile strategy to improve the efficiency of photocatalysts.

关键词： Surface junction Photocatalysis N-deethylation Adsorption efficiency Redox potential

Design and Analysis of a Magnetic Bearings with Three Degrees of Freedom

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Chinese Journal of Mechanical Engineering 2019年第1期32卷 142-151页

作者： Ye Yuan Yukun sun Qianwen xiang School of Electrical and Information Engineering Jiangsu University College of Electrical Engineering Nanjing Institute of Technology

The current research of supporting and transmission system in flywheel energy storage system(FESS) focuses on the low consumption design. However, friction loss is a non-negligible factor in the high-speed but lightweight FESS energy and momentum storage with mechanical-type supporting system. In order to realize the support system without mechanical loss and to maximize the e ciency of the flywheel battery, a permanent magnet biased magnetic bearings(PMBMB) is applied to the FESS with the advantages of low loss, high critical speed, flexible controllability and compact structure. In this frame, the relevant research of three degrees of freedom(3-DOF) PMBMB for a new type FESS is carried out around the working principle, structural composition, coupling characteristics analysis, mathematical model, and structural design. In order to verify the performance of the 3-DOF PMBMB, the radial force mathematical model and the coupling determination equations of radial two DOF are calculated according to an equivalent magnetic circuit, and radial–axial coupling is analyzed through finite element analysis. Moreover, a control system is presented to solve the control problems in practical applications. The rotor returns to the balanced position in 0.05 s and maintains stable suspension. The displacement fluctuation is approximately 40 μm in the y direction and 30 μm in the x direction. Test results indicate that the dynamic rotor of the proposed flywheel energy storage system with PMBMB has excellent characteristics, such as good start-of-suspension performance and stable suspension characteristics. The proposed research provides the instruction to design and control a low loss support system for FESS.

关键词： Flywheel energy storage system Magnetic bearings Degrees of freedom Coupling Finite element analysis

New clues concerning pigment biosynthesis in green colored fiber provided by proteomics-based analysis

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Journal of Integrative Agriculture 2018年第1期17卷 46-53页

作者： LI Yan-jun sun Shi-chao ZHANG Xin-yu WANG xiang-fei LIU yong-chang XUE Fei sun Jie Key Laboratory of Oasis Eco-agriculture College of AgricultureShihezi University College of Pharmacy Shihezi University

To separate the proteins related to pigment synthesis in green colored fiber （GCF）, we performed a comparative proteomic analysis to identify the differentially expressed proteins between green cotton fiber and a white near-isogenic line （NIL）. One differential spot identified as phenylocumaran benzylic ether redutase-like protein （PCBER） was expressed only in GCF, but was not found in white colored fiber （WCF） at any time points. Since PCBER was a key enzyme in lignans biosynthesis, total lignans were extracted from GCF and WCF and their content was determined by using a chromotropic acid spectrophotometric method. The results showed that total lignans content in GCF was significantly higher than that in WCF. The qPCR analysis for two PLR genes associated with lignans biosynthesis showed that the expression level of two genes was much higher in GCF than that in WCF at 24 and 27 days post anthesis （DPA）, which may be responsible for the higher lignans content in GCF. Our study suggested that PCBER and lignans may be responsible for the color difference between GCF and WCF. Additionally, p-dimethylaminocinnamaldehyde （DMACA） staining demonstrated that the pigment in GCF was not proanthocyanidins, and was different from that in brown colored fiber （BCF）. This study provided new clues for uncovering the molecular mechanisms related to pigment biosynthesis in GCF.

关键词： green colored cotton proteomics upland cotton pigment biosynthesis phenylocumaran benzylic ether redutase- like protein

Biomimetic Modification of Super-wetting Electrospun Poly(vinylidene fluoride)Porous Fibers with Organic Dyes and Heavy Metal Ions Adsorption,Oil/Water Separation,and Sterilization Performances Toward Wastewater Treatment

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Chinese Journal of Polymer Science 2022年第7期40卷 738-753页

作者： De-xiang sun Xiao-Lei Liao Nan Zhang Ting Huang Yan-Zhou Lei Xiao-Ling Xu yong Wang School of Materials Science&Engineering Key Laboratory of Advanced Technologies of Materials(Ministry of Education)Southwest Jiaotong UniversityChengdu610031China Analytical and Testing Center Southwest Jiaotong UniversityChengdu610031China

Polymeric membranes with the integration of various functional performances toward wastewater treatment are urgently ***,most of the polymeric membranes only exhibit a single function of highly efficiently removing one kind of *** this work,a biomimetic modification method was introduced to tailor the chemical and topological structure of the porous poly(vinylidene fluoride)(PVDF)fibers prepared by *** polydopamine(PDA)nanoparticles were homogeneously introduced onto the surface of PVDF porous fibers via precisely tailoring the concentration of dopamine,which endowed the fibers with more polar groups and bigger roughness but did not destroy the crystalline *** fibrous membranes exhibited switchable superhydrophilicity and superlipophilicity characteristics,excellent adsorption abilities toward organic dyes,heavy metal ions and *** highest adsorption capacities achieved 917.4 mg/g toward methylene blue(MB),42.6 mg/g toward Cr(VI)and 74.6 g/g toward silicone oil,***,the membrane could rapidly remove the trace MB when water flowed through the *** membrane also exhibited excellent sterilization performances,and the bacterial eliminating rate achieved 99.9%for the *** and *** excellent light-to-heat conversion ability endowed the membrane with the selfheating ability,furtherly intensifying the wastewater treatment *** work confirms that the PDA nanoparticles-decorated PVDF porous fibers might be the new generation adsorbents used in wastewater treatment.

关键词： Poly(vinylidene fluoride)porous fibers Biomimetic modification Adsorption Oil/water treatment Antimicrobial performance

Effects of the tensor force on low-energy heavy-ion fusion reactions:a mini review

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Communications in Theoretical Physics 2022年第9期74卷 275-283页

作者： xiang-xiang sun Lu Guo School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China CAS Key Laboratory of Theoretical Physics Institute of Theoretical PhysicsChinese Academy of SciencesBeijing 100190China

In recent several years,the tensor force,one of the most important components of the nucleon-nucleon force,has been implemented in time-dependent density functional theories and it has been found to influence many aspects of low-energy heavy-ion reactions,such as dissipation dynamics,sub-barrier fusions,and low-lying vibration states of colliding ***,the effects of tensor force on fusion reactions have been investigated from the internuclear potential to fusion crosssections *** this work,we present a mini review on the recent progress on this *** the recent progress of low-energy reaction theories,we will also mention more possible effects of the tensor force on reaction dynamics.

关键词： low-energy heavy-ion collision time-dependent density functional theory ion-ion potential fusion cross sections tensor force

Performance evaluation of the effect of humic acid on Anammox granular sludge:Apparent morphology,nitrogen removal and microbial community

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Journal of Environmental Sciences 2024年第10期144卷 148-158页

作者： Wenhui Huang Peiling Xu xiang Li yong Huang Hao sun Wei Li Mao Zhang Miao Shi Yan Yuan School of Environmental Science and Engineering Suzhou University of Science and TechnologySuzhou 215009China Suzhou Hongyu Environmental Technology Company Limited by Shares Suzhou 215011China Suzhou Tianjun Environmental Technology Limited Company Suzhou 215011China Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment Suzhou University of Science and TechnologySuzhou 215009China

Humic acid(HA)is a typical refractory organicmatter,so it is of great significance to investigate its effect on the performance of Anammox granular *** the dosage ofHA≤50 mg/L,HA promotes the total nitrogen removal rate(NRR)to 1.45 kg/(m^(3)·day).When HA was between 50 and 100 mg/L,the NRR of Anammox was *** this time,the adsorption of HA causes the sludge to gradually turn fromred to brown,but the activities of heme and enzymes showed that its capacitywas not *** HA levels reached 250 mg/L,the NRR dropped to 0.11 kg/(m^(3)·day).Moderate HA levels promoted the release of extracellular polymeric substance(EPS),but excessive HA levels lead to a decrease in EPS *** inhibited Anammox activity,which indirectly hindered the transmission of substrate and accumulated substrate *** HA promoted the increase of heterotrophicmicrobial abundance in Anammox system,the microbial diversity decreased *** the increase of HA concentration,the abundance of Candidatus_Brocadia,the main functional microorganism of Anammox system,decreased gradually,while the abundance of Candidatus_Kuenenia increased gradually.

关键词： Anammox Landfill leachate Humic acid Heme Microbial community Enzyme activity

A Method to Construct the Nonlocal Symmetries of Nonlinear Evolution Equations

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Chinese Physics Letters 2013年第10期30卷 5-8页

作者： XIN xiang-Peng CHEN yong Shanghai Key Laboratory of Trustworthy Computing East China Normal UniversityShanghai 200062

A method is proposed to seek the nonlocal symmetries of nonlinear evolution *** validity and advantages of the proposed method are illustrated by the applications to the Boussinesq equation,the coupled Korteweg-de Vries system,the Kadomtsev–Petviashvili equation,the Ablowitz–Kaup–Newell–Segur equation and the potential Korteweg-de Vries *** facts show that this method can obtain not only the nonlocal symmetries but also the general Lie point symmetries of the given equations.

关键词： equations equation equation

Coherent interface strengthening of ultrahigh pressure heat-treated Mg-Li-Y alloys

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Journal of Materials Science & Technology 2020年第16期47卷 79-83页

作者： Shun Zhang yong sun Ruizhi Wu xiang Wang Xiao-Bo Chen Carlos Fernandez Qiuming Peng State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao066004China Key Laboratory of Superlight Materials&Surface Technology Ministry of EducationHarbin Engineering UniversityHarbin150001China School of Engineering RM IT UniversityCarlton3053VICAustralia School of Pharmacy and Life Sciences Robert Gordon UniversityAberdeenAB107GJUK

Achieving good strength-ductility of Mg alloys has always been a crucial issue for the widespread applications of Mg-based structural ***,an unexpected double-stage strengthening phenomenon was discovered in Mg-8Li-1Y(wt.%)alloys through high pressure(6 GPa)heat treatments over a range of 700-1300℃.Attractively,the yield strength values are improved remarkably without losing their *** low temperature strengthening mechanism is mainly driven by the formation of large-volume nanoscale contraction *** contrast,the high-temperature strengthening reason is ascribed to the presence of densely nano-sized stacking *** coherent interfaces contribute effectively to high mechanical strength without any tradeoff in ductility.

关键词： Mg alloys Nano-twins Stacking faults Strengthening