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Enhanced hydrolytic removal of tylosin in wastewater using polymer-based solid acid catalysts converted from polystyrene

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Journal of Environmental Sciences 2023年第4期126卷 287-296页

作者： Shiling Li Shuhan Sun Fei Qi Xiaomin Dou Beijing Key Lab for Source Control Technology of Water Pollution College of Environmental Science and EngineeringBeijing Forestry UniversityBeijing 100083China Engineering Research Center for Water Pollution Source Control and Eco-remediation College of Environmental Science and EngineeringBeijing Forestry UniversityBeijing 100083China

Antibiotic production wastewater usually contains high concentrations of antibiotic residues,which can cause instability and deterioration of biological wastewater treatment units and also domestication and proliferation of antibiotic-resistance bacteria.An effective pretreatment on antibiotics production wastewater is expected to selectively reduce the concentration of antibiotics and decrease the toxicity,rather than mitigate organic and other contaminants before further treatments.In this work,two polymer-based solid acids,PS-S and CPS-S bearing high concentrations of-SOH_(3)groups (up to 4.57 mmol/g),were prepared and successfully used for hydrolytic mitigation of 100 mg/L tylosin within 20 min.The co-existence of high concentrations of COD and humic substances did not affect the mitigation of tylosin obviously,while more than 500 mg/L of nitrogenous compounds suppressed the hydrolytic efficiency.Recycle and reuse experiments showed that the solid acids performed well in five cycles after regeneration.Three transformation products (P1,P2 and P3)were identified using UPLC-QTOF-MS/MS.Sugar moieties including mycarse,mycaminose,and mycinose detached and released simultaneously or in order from the 16-member lactone ring through desugarization,which led to a dramatic decrease in antibacterial activity as revealed by cytotoxicity evaluations using S.aureus.Ecotoxicity estimation indicated the acute toxicities of the hydrolyzed products to model species (e.g.,fish,daphnid and green algae) were classified as“not harmful”.This work suggested an effective and selective method to pretreat tylosin-contained production wastewater by using polymer-based solid acids.These results will shed light on effective elimination of antibiotics pollution from pharmaceutical industries through strengthening the pretreatments.

关键词： Polymer Sulfonation Solid acid catalysts Tylosin hydrolysis Antibiotic

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Nitrate removal from aqueous solutions by magnetic cationic hydrogel:Effect of electrostatic adsorption and mechanism

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Journal of Environmental Sciences 2020年第5期32卷 177-188页

作者： Junyi Li Shuoxun Dong Yili Wang Xiaomin Dou Haotian Hao College of Environmental Science and Engineering Beijing Key Lab for Source Control Technology of Water PollutionBeijing Forestry UniversityBeijing 100083China Center for Water and Ecology State Key Joint Laboratory of Environment Simulation and Pollution ControlSchool of EnvironmentTsinghua UniversityBeijing 100084China Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China

Excessive nitrate(NO3-)is among the most problematic surface water and groundwater pollutants.In this study,a type of magnetic cationic hydrogel(MCH)is employed for NO3-adsorption and well characterized herein.Its adsorption capacity is considerably pHdependent and achieves the optimal adsorption(maximum NO3--adsorption capacity is95.88±1.24 mg/g)when the pH level is 5.2-8.8.The fitting result using the homogeneous surface diffusion model indicates that the surface/film diffusion controls the adsorption rate,and NO3-approaches the center of MCH particles within 30 min.The diffusion coefficient(Ds)and external mass transfer coefficient(kF)in the liquid phase are1.15×10-6 cm2/min and 4.5×10-6 cm/min,respectively.The MCH is employed to treat surface water that contains 10 mg/L of NO3-,and it is found that the optimal magnetic separation time is 1.6 min.The high-efficiency mass transfer and magnetic separation of MCH during the adsorption-regeneration process favors its application in surface water treatment.Furthermore,the study of the mechanism involved reveals that both-N+(CH3)3 groups and NO3-are convoluted in adsorption via electrostatic interactions.It is further found that ion exchange between NO3-and chlorine occurs.

关键词： Adsorption Nitrate removal Low concentration Electrical stern layer Magnetic cationic hydrogel

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Brilliant red X-3B uptake by a novel polycyclodextrin-modified magnetic cationic hydrogel:Performance,kinetics and mechanism

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Journal of Environmental Sciences 2020年第3期32卷 264-276页

作者： Junyi Li Yili Wang Xiaomin Dou Haotian Hao Shuoxun Dong Xia Shao Yanchun Deng College of Environmental Science and Engineering Beijing Key Lab for Source Control Technology of Water PollutionBeijing Forestry UniversityBeijing 100083China Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085China Beijing Key Lab of Urban Atmospheric Volatile Organic Compounds Pollution Control and Application Beijing Municipal Research Institute of Environmental ProtectionBeijing 100037China

A novel polycyclodextrin-modified magnetic cationic hydrogel(PCD-MCH) was developed and its performance,kinetics and mechanism for the removal of reactive brilliant red X-3B(X-3B) were studied.The results showed that the zeta-potential of PCD-MCH was 32.8 to16.7 mV at pH 3.0-10.5.The maximum X-3B adsorption capacity of PCD-MCH was2792.3 mg/g.The adsorption kinetics could be well-described by the Weber-Morris model and the homogeneous surface diffusion model(HSDM).Diffusion stages corresponding to surface or film diffusion,intra-particle or wide mesopore diffusion,and narrow mesopore/micropore diffusion occurred at 0-120,120-480 and 480-1200 min,respectively.The latter two diffusion stages were rate-controlling for X-3B adsorption kinetics.At the initial X-3B concentration of 600 mg/L,the diffusion coefficient(Ds) and external mass transfer coefficient in the liquid phase(kF) were 3x10^-11 cm^2/min and 4.68 x 10^-6 cm/min,respectively.X-3B approaching the center of PCD-MCH particles could be observed at 360 min.At the end of the third diffusion stage,the Cp at q/qe=0 was 45.20 mg/L,which was close to the homogeneous Cp value of 46 mg/L along the radius of PCD-MCH particles.At pH 3.0-10.0,PCD-MCH showed stable X-3B adsorption capacities.After five regeneration-reuse cycles,the residual adsorption capacity of regenerated PCD-MCH was higher than 892.7 mg/g.The corresponding adsorption mechanism was identified as involving electrostatic interactions,cyclodextrin cavities and hydrogen bonds,of which cyclodextrin cavities showed prominent capture performance towards dye molecules through the formation of inclusion complexes.

关键词： Adsorption Polycyclodextrin-magnetic cationic hydrogel Reactive brilliant red X-3B Homogeneous surface diffusion model(HSDM) Electrostatic interactions Inclusion complexes

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Characteristics of sea ice kinematics from the marginal ice zone to the packed ice zone observed by buoys deployed during the 9th Chinese Arctic Expedition

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Acta Oceanologica Sinica 2022年第7期41卷 113-127页

作者： xiaomin Chang Longchun Ye Guangyu Zuo Jingyue Li Keyu Wei Yinke dou College of Water Resources Science and Engineering Taiyuan University of TechnologyTaiyuan030024China College of Electrical and Power Engineering Taiyuan University of TechnologyTaiyuan030024China

Sea ice growth and consolidation play a significant role in heat and momentum exchange between the atmosphere and the ocean.However,few in situ observations of sea ice kinematics have been reported owing to difficulties of deployment of buoys in the marginal ice zone(MIZ).To investigate the characteristics of sea ice kinematics from MIZ to packed ice zone(PIZ),eight drifting buoys designed by Taiyuan University of Technology were deployed in the open water at the ice edge of the Canadian Basin.Sea ice near the buoy constantly increased as the buoy drifted,and the kinematics of the buoy changed as the buoy was frozen into the ice.This process can be determined using sea ice concentration,sea skin temperature,and drift speed of buoy together.Sea ice concentration data showed that buoys entered the PIZ in mid-October as the ice grew and consolidated around the buoys,with high amplitude,high frequency buoy motions almost ceasing.Our results confirmed that good correlation coefficient in monthly scale between buoy drift and the wind only happened in the ice zone.The correlation coefficient between buoys and wind was below 0.3 while the buoys were in open water.As buoys entered the ice zone,the buoy speed was normally distributed at wind speeds above 6 m/s.The buoy drifted mainly to the right of the wind within 45°at wind speeds above 8 m/s.During further consolidation of the ice in MIZ,the direct forcing on the ice through winds will be lessened.The correlation coefficient value increased to 0.9 in November,and gradually decreased to 0.7 in April.

关键词： sea ice kinematics buoy observations remote sensing marginal ice zone

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Research on ultrasonic-based investigation of mechanical properties of ice

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Acta Oceanologica Sinica 2021年第10期40卷 97-105页

作者： xiaomin Chang Wenhao Liu Guangyu Zuo Yinke dou Yan Li College of Water Resources Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China College of Electrical and Power Engineering Taiyuan University of TechnologyTaiyuan 030024China

Arctic sea ice area and thickness have declined dramatically during the recent decades.Sea ice physical and mechanical properties become increasingly important.Traditional methods of studying ice mechanical parameters such as ice-coring cannot realize field test and long-term observation.A new principle of measuring mechanical properties of ice using ultrasonic was studied and an ultrasonic system was proposed to achieve automatic observation of ice mechanical parameters(Young’s modulus,shear modulus and bulk modulus).The ultrasonic system can measure the ultrasonic velocity through ice at different temperature,salinity and density of ice.When ambient temperature decreased from 0°C to-30°C,ultrasonic velocity and mechanical properties of ice increased,and vice versa.The shear modulus of the freshwater ice and sea ice varied from 2.098 GPa to 2.48 GPa and 2.927 GPa to 4.374 GPa,respectively.The bulk modulus of freshwater ice remained between 3.074 GPa and4.566 GPa and the sea ice bulk modulus varied from 1.211 GPa to 3.089 GPa.The freshwater ice Young’s modulus kept between 5.156 GPa and 6.264 GPa and sea ice Young’s modulus varied from 3.793 GPa to 7.492 GPa.The results of ultrasonic measurement are consistent with previous studies and there is a consistent trend of mechanical modulus of ice between the process of ice temperature rising and falling.Finally,this ultrasonic method and the ultrasonic system will help to achieve the long-term observation of ice mechanical properties of ice and improve accuracy of sea ice models.

关键词： ice mechanical properties ultrasonic testing spectrum analysis

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Vertical crosslinking MoS_2/three-dimensional graphene composite towards high performance supercapacitor

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Chinese Chemical Letters 2018年第4期29卷 606-611页

作者： Chengjie Han Zhen Tian Huanglin dou xiaomin Wang Xiaowei Yang College of Materials Science and Engineering Taiyuan University of Technology Taiyuan 030024 China Research Institute of Tsinghua University in Shenzhen Shenzhen 518057 China

Molybdenum disulfide（MoS2） has been stimulated in extensive researches due to its layered structure and the potential as an electrochemical energy material. However, the effects on electrochemical performance of concentration of MoS2 are rarely mentioned. In this paper, the effects of different concentrated layered MoS2 on the morphology and electrochemical properties of the composite of MoS2 and three-dimensional graphene（MoS2/3DG） were discussed. The results show that layered MoS2 was successfully compounded to 3DG and formed a vertical crosslinking structure. It can be observed that MoS2 nanosheets are vertically loaded on the inner and outer surface of graphee when the concentration of MoS2 is 0.20 mg/L. The specific capacitance of composite（MoS2（0.20 mg/L）/3 DG）reaches 2182.33 mF/cm^2 at the current density of 1 mA/cm^2, and the specific capacitance remains 116.83% after 5000 cycles. When the current density increased 100 times（from 1 mA/cm^2 to 100 mA/cm^2）, the specific capacitance retains 78.9%. Meanwhile, the hybrid energy storage devises can deliver an energy density of 130.34 Wh/m^2. The superior electrochemical properties are attributed to the synergistic effect of MoS2 and 3DG. Therefore, the material has a potential application on supercapacitor electrode material.

关键词： MoS2 Three-dimensional graphene Supercapacitor Vertical crosslinking Energy storage

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Five-year warming does not change soil organic carbon stock but alters its chemical composition in an alpine peatland

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Pedosphere 2023年第5期33卷 776-787页

作者： Jingcong QIU Minghua SONG Chunmei WANG Xiaomin Dou Fangfang LIU Jiaxin WANG Chenying ZHU Shiqi WANG College of Environmental Science and Engineering Beijing Forestry UniversityBeijing 100083China Key Laboratory of Ecosystem Network Observation and Modeling Institute of Geographic Sciences and Natural Resources ResearchChinese Academy of SciencesBeijing 100101China

Climate warming may promote soil organic carbon(SOC)decomposition and alter SOC stocks in terrestrial ecosystems,which would in turn affect climate warming.We manipulated a warming experiment using open-top chambers to investigate the effect of warming on SOC stock and chemical composition in an alpine peatland in Zoigêon the eastern Tibetan Plateau,China.Results showed that 5 years of warming soil temperatures enhanced ecosystem respiration during the growing season,promoted above-and belowground plant biomass,but did not alter the SOC stock.However,labile O-alkyl C and relatively recalcitrant aromatic C contents decreased,and alkyl C content increased.Warming also increased the amount of SOC stored in the silt-clay fraction(0.25 mm,respectively).These changes in labile and recalcitrant C were largely associated with warming-induced increases in soil microbial biomass C,fungal diversity,enzyme activity,and functional gene abundance related to the decomposition of labile and recalcitrant C compounds.The warming-induced accumulation of SOC stored in the silt-clay fraction could increase SOC persistence in alpine peatland ecosystems.Our findings suggest that mechanisms mediated by soil microbes account for the changes in SOC chemical composition and SOC in different aggregate size fractions,which is of great significance when evaluating SOC stability under climate warming conditions.

关键词： functional gene nuclear magnetic resonance simulated global warming soil carbon components soil enzymes soil microbial diversity

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Effect of homogenization annealing on internal residual stress distribution and texture in ME21 magnesium alloy extruded plates

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Journal of Magnesium and Alloys 2019年第1期7卷 186-192页

作者： Yong Lian Pengfei Ji Jin Zhang xiaomin Yuan Weisheng Xu Yongle Zhao Jiahao Mo Lin Zheng Shitao dou Institute for Advanced Materials and Technology University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory of Corrosion Erosion and Surface TechnologyBeijing 100083China Capital Aerospace Machinery Company Beijing 10076China Institute of Southwest Technology and Engineering Chongqing 400039China

The distribution of residual stresses through thickness of 5 mm-thick ME21 magnesium alloy extruded plates was analyzed non-destructively using short-wavelength X-ray diffraction(SWXRD),and the effect of homogenization annealing before extrusion on the residual stress was discussed.The classic d 0 method with an annealed stress-free reference specimen was employed to determine the residual stress of the extruded plates.The residual stress results showed that the gradient of residual stress in the transverse direction was larger than that of the extrusion direction.The homogenization process prior to extrusion weaken the formed sample’s texture.The maximum residual stress of the as-extruded plate was reduced,and the residual stress distribution was homogenized.

关键词： ME21 magnesium alloy Homogenization annealing Residual stress Short-wavelength X-ray diffraction

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电力系统经济调度的量子粒子群改进算法

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重庆邮电大学学报（自然科学版） 2020年第4期32卷 528-535页

作者：窦小敏秦宁宁江南大学设计学院江苏无锡214122 江南大学物联网工程学院江苏无锡214122

电力系统经济调度(economic dispatch,ED)通过合理配置电力资源,在满足实际运行约束的前提下,使发电成本率最小化。针对ED问题,将量子粒子群优化(quantum-behaved particle swarm optimization,QPSO)算法与随机扰动策略相结合,提出了一... 详细信息

电力系统经济调度(economic dispatch,ED)通过合理配置电力资源,在满足实际运行约束的前提下,使发电成本率最小化。针对ED问题,将量子粒子群优化(quantum-behaved particle swarm optimization,QPSO)算法与随机扰动策略相结合,提出了一种改进的随机扰动量子粒子群优化(QPSO with random perturbation,RPQPSO)算法。扰动策略采用2种方式,在进化后期根据随机概率对群中的每个粒子进行扰动,避免算法陷入局部最优。为了验证其有效性,利用一组标准测试函数对RPQPSO算法进行了性能测试,测试表明,该算法有助于增加种群多样性,提高算法的全局搜索能力。通过将该算法应用到典型电力系统中进行测试,该算法相较于传统遗传算法、粒子群算法和QPSO算法,在解的质量、鲁棒性和收敛性等方面都取得了较大的提高,表现出优异的求解性能。

关键词：经济调度约束优化随机扰动进化计算粒子群优化城镇化

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基于遥感图像的景观生态平衡控制系统设计

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现代电子技术 2019年第14期42卷 108-111页

作者：窦小敏秦宁宁江南大学

城市发展水平不仅体现在社会效益与经济效益方面,在生态效益方面尤为重要,生态平衡控制是保障城市可持续化发展的重要途径。从提取层与分析层角度设计基于遥感图像的景观生态平衡控制系统。遥感图像边缘分割是系统提取层的核心,分割遥... 详细信息

城市发展水平不仅体现在社会效益与经济效益方面,在生态效益方面尤为重要,生态平衡控制是保障城市可持续化发展的重要途径。从提取层与分析层角度设计基于遥感图像的景观生态平衡控制系统。遥感图像边缘分割是系统提取层的核心,分割遥感图像边缘得到景观斑块分割结果。根据遥感图像景观斑块分割结果提取有效景观数据信息,计算分维数、多样性、均匀度等景观指数,分析景观生态平衡状况,据此制定合理的景观生态平衡控制方案,控制景观生态平衡。研究结果表明,该系统可精准分割遥感图像边缘,有效计算城市区域景观指数、分析生态平衡状况,合理控制区域景观生态平衡。

关键词：遥感图像边缘分割景观指数景观斑块生态平衡控制控制系统

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