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Production of the C/TiO_(2)composite with a high-performance electrochemical property from titanium-rich sludge via in-situ C coating

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Journal of Environmental Sciences 2024年第3期137卷 131-143页

作者： Hualong Wu Yanxia Zhao Jiexi Wang Xiaoyan li Kaimin Shih Xuguang Li Wei liu School of Water Conservancy and Environment University of JinanJinan 250022China State Key Lab of Physical Chemistry of Solid Surface Collaborative Innovation Center of Chemistry for Energy MaterialsCollege of MaterialsXiamen UniversityXiamen 361005China School of Metallurgy and Environment Central South UniversityChangsha 410083China Department of Civil Engineering The University of Hong KongPokfulamHong KongChina Institute of Environment and Ecology Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China

Resource recycling from waste-water and sludge is an important part of the 14th Five-Year Plan in China.The emerging titanium-based coagulants have drawn growing attentions due to their strong coagulation capability in water purification and value-added Ti-loaded sludge production.Management and recovery of the high value-added sludge into functional nanomaterials is highly significant for both sludge reduction and environmental remediation.The present study was carried out to investigate the recycle of the coagulated Ti-loaded sludge to produce functional C/TiO_(2)composites as the anode materials for lithium-ion batteries(liBs).It is the first time that the application of the Ti-loaded wastewater sludge derived C/TiO_(2)was evaluated for liBs.The experimental results showed that the carbon coating through in-situ carbonization of the sludge produced the C/TiO_(2)composites with a high specific surface area,stable structural integrity,and excellent electrochemical properties that would facilitate li+diffusion in long-term liBs usage.The C/TiO_(2)composites calcinated from the polytitanium sulfate-coagulated sludge at 800℃(N_(2))exhibited the best electrochemical performance during the cycling tests(601 m Ah/g at 100 m A/g after 200 cycles).The research work demonstrates the promising prospect of the recycle and value-added utilization of the Ti-loaded sludge in the production of high-performance C/TiO_(2)composites for energy storage applications.This study provides a new way for the management and reuse of Ti-loaded waste-sludge.

关键词： Sludge recovery Ti-loaded sludge In-situ coating lithium-ion battery

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Migration of endothelial cells into photo-responsive hydrogels with tunable modulus under the presence of pro-inflammatory macrophages

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Regenerative Biomaterials 2019年第5期6卷 259-267页

作者： Wangbei Cao Xuguang Li Xingang Zuo Changyou Gao MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China

Cell migration in three-dimensional environment is extremely important for tissue regeneration and other biological processes.In this work,a model system was developed to study how endothelial cells(ECs)migrate into photo-responsive hydrogels under the presence of pro-inflammatory macrophages.The hydrogel was synthesized from hyaluronic acid grafted with coumarin and methacrylate moieties by both carbon–carbon covalent linking and coumarin dimerization under UV irradiation at 365 nm.The structure of the hydrogel was conveniently modulated by UV irradiation at 254nm to decompose the coumarin dimers,leading to the significant decrease of modulus and increase of swelling ratio and mesh size.Under the presence of M1 macrophages,ECs were induced to migrate into the hydrogels with a different degree.A significant larger net displacement of ECs was found in the softer hydrogel obtained by irradiation with UV at 254nm than in the stiffer original one at day 7.

关键词： 3D cell migration immune-response hydrogel photo-responsive hyaluronic acid

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Induced migration of endothelial cells into 3D scaffolds by chemoattractants secreted by pro-inflammatory macrophages in situ

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Regenerative Biomaterials 2017年第3期4卷 139-148页

作者： Xuguang Li Yuankun Dai Tao Shen Changyou Gao MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China

Cell migration in scaffolds plays a crucial role in tissue regeneration,which can better mimic cell behaviors in vivo.In this study,a novel model has been proposed on controlling 3D cell migration in porous collagen-chitosan scaffolds with various pore structures under the stimulation of inflammatory cells to mimic the angiogenesis process.Endothelial cells(ECs)cultured atop the scaffolds in the Transwell molds which were placed into a well of a 24-well culture plate were promoted to migrate into the scaffolds by chemoattractants such as vascular endothelial growth factor(VEGF)and tumor necrosis factor-alpha(TNF-α)secreted by the pro-inflammatory macrophages incubated in the well culture plate.The phenotype of macrophages was mediated by 50 ng/ml interferongamma(IFN-c)and different concentrations of lipopolysaccharide(LPS,150–300 ng/ml).The cell migration depth had a positive correlation with LPS concentration,and thereby the TNF-a concentration.The ECs migrated easier to a deeper zone of the scaffolds prepared at10C(187 lm in pore diameter)than that at20C(108 lm in pore diameter)as well.The method provides a useful strategy to study the 3D cell migration,and is helpful to reveal the vascularization process during wound healing in the long run.

关键词： cell migration chemoattractants endothelial cells macrophages scaffolds

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Analysis of the Pyrolysis of Solid Recovered Fuel and Its Sorted Components by using TG-FTIR and DAEM

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Journal of Thermal Science 2023年第4期32卷 1671-1683页

作者： WU Lei JIANG xuguang LV Guojun li Xiaodong YAN Jianhua State Key Laboratory of Clean Energy Utilization Institute for Thermal Power EngineeringZhejiang UniversityHangzhou310027China

Currently,waste disposal has been highlighted strategically all over the world.Solid recovered fuel(SRF)with a high calorific value is manufactured from municipal solid waste(MSW).Thermogravimetric Fourier transform infrared spectroscopy(TG-FTIR)and distributed activation energy model(DAEM)were utilized to study the pyrolysis of the individual components and their mixture(i.e.SRF),which were obtained from a MSW incineration power plant.The best operating conditions were defined by comparing the effect of heating rates and flow rates of sweep gas.The gaseous products and functional groups in the pyrolysis of each component and their mixture were researched.Additionally,a direct search method was presented to obtain the DAEM kinetic parameters.DAEM equations for volatile products were given to describe pyrolysis of SRF.The model prediction results are consistent with the experimental results.The kinetic data will provide a basis for gas composition regulation from theoretical modeling.

关键词： solid recovered fuel pyrolysis TG-FTIR DAEM

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A micro-investigation on water bridge effects for unsaturated granular materials with constant water content by discrete element method

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Particuology 2023年第12期83卷 50-62页

作者： Mengchen li Jiyuan Luan xuguang Gao Ji-Peng Wang Abdelali Dadda School of Civil Engineering Shandong University17922 Jingshi RoadJinan250061China

The most common state of surface soil is unsaturated.Changes in water content will substantially impact its strength,leading to geological and engineering catastrophes.This paper used liGGGHTS software to simulate the water bridge effect of unsaturated granular materials with constant water content and verify the rationality of the simplification of the stress-force-fabric(SFF)relationship.The results showed that the capillary force was not isotropic,which was different from the previous study,thus it cannot be overlooked in the simplification of the SFF relationship.Moreover,the influence of water content on the macroscopic mechanical behavior of unsaturated granular materials was interpreted through the evolutions of coordination number,interparticle force,fabric and force anisotropy,and other microscopic parameters.Compared to the literature,we found that different water bridge models would not change the characteristics of the solid skeleton.

关键词： Unsaturated granular material Water bridge effect Water content Discrete element method Stress-force-fabric(SFF)relationship

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Flow characteristic of polymer solutions in porous media:Influence of the molecular weight and concentration

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Petroleum 2023年第2期9卷 214-222页

作者： Yingjie Dai Jia li li li Yifei liu Yuan li Xiangyu Wang xuguang Song Caili Dai Bin Yuan Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum East China)Ministry of EducationQingdao 266580China Shandong Key Laboratory of Oilfield Chemistry(China University of Petroleum East China)Qingdao 266580China Nanchong Vocational and Technical College Nanchong 637131China Oil&Gas Technology Research Institute of Changqing Oilfield Company Xi'an 710000China Sinopec Research Institute of Petroleum Engineering Fracturing&Acidizing and Natural Gas Production Research InstituteDongying 257000China Department of Chemical and Materials Engineering University of AlbertaEdmontonAB T6G 1H9Canada

The polymer solution flow in porous media is a central research topic related to hydraulic fracturing measures,formation damage and fracture propagation.Influenced by molecular weights and concentrations,various flow patterns of polymer in pores are presented,resulting in different filtration loss.In this work,the effectiveness of various polymer solutions for filtration loss was assessed by utilizing the core flooding experiment firstly.The result shows that lesser filtration loss normally is inextricably linked to solutions with high molecular weight and concentration.Subsequently,the flow behaviors of polymer solutions investigated by designed micro pore-throat structure and micro-particle image velocimetry(m-PIV)further confirmed the above result.It was found that the central convergent flow pattern benefiting from higher viscous force loss and less filtration loss was observed at high flow rates(0.5 mL/h),and higher molecular weight and concentration were more prone to convergent flow patterns.The viscosity force loss increases by about 4 times varying the molecular weight of polymer from 5×10^(6)to 18×10^(6)g/mol or the concentration from 0.05 to 0.3%.It interprets higher molecular weight and concentration in core studies and field observations with decreased filtration loss of HPAM.This work provides a theoretical foundation for the application of fracturing fluids as well as fresh perspectives on how to access the filtration loss of fracturing fluids.

关键词： Polymer solution Porous media Flow pattern m-PIV

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Thermal evolution characteristics of Triassic coal in Chuxiong Basin and its geological significance

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International Journal of Mining Science and Technology 2016年第5期26卷 937-945页

作者： Wang Meng li Xiaoping Dai xuguang School of Resources and Earth Science China University of Mining & Technology Key Laboratory of Coalbed Methane Resource & Reservoir Formation Process China University of Mining & Technology

Chuxiong Basin in Yunnan is a typical Mesozoic foreland basin which is enriched in widely distributed Triassic coal resources with thick deposits and of important strategic significance. By applying vitrinite reflectance measurement, inclusion thermometry, fission track dating and EASY% Ro numerical simulation, the Triassic coal thermal evolution history of the Chuxiong Basin was analyzed, and the results were concluded. The vitrinite reflectance of Chuxiong Basin is higher in the west and south in general.Vertically, in the east, west, and north of the basin, the vitrinite reflectance increases with increasing depth, and in the northern part, exceptionally high values occur, and there is no significant regularity in the east. The formation of inclusions inside quartz veins in Chuxiong Basin Triassic coal are unrelated with magmatic hydrothermal fluid, and there are multi-phase inclusions formed in three or four sections of tectonic movements. The main heating period(apparent age) of the Triassic coal is concentrated in the late Cenozoic, during which the coal was subjected to repeated thermal disturbance, resulting in a multimodal distribution of the fission track data, which reveals mild burial features of the early stages of the Late Cenozoic. The Triassic coal of Chuxiong Basin has experienced two major temperature increasing processes, which occurred in the early-mid Yanshan and the early Himalayan, respectively. The first hydrocarbon generation period of coal organic matter occurred in the formation stage of the foreland basin, during which the south and west of the basin generated large amounts of hydrocarbon, but little was preserved. The second generation stage in the Early Himalayan had conditions suitable for high gas accumulation, especially in the western and southern regions. The upper Triassic coal is of moderate burial depth and is less affected by the strike-slip effect. There are key areas of Chuxiong Basin oil and gas exploration, such as the Yanfeng Basin in the north-central, Yongren and Yunl

关键词： Chuxiong Basin Thermal evolution Triassic Coal

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Robust Fe^(2+)-doped nickel-iron layered double hydroxide electrode for electrocatalytic reduction of hexavalent chromium by pulsed potential method

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Journal of Materials Science & Technology 2022年第15期110卷 73-83页

作者： Zhifei Wang Jinbo Xue Yong li Qianqian Shen Qi li Xiaochao Zhang Xuguang Liu Husheng Jia Key Laboratory of Interface Science and Engineering in Advanced Materials Taiyuan University of TechnologyMinistry of EducationTaiyuan 030024China College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China School of Materials Science and Engineering Southwest Jiaotong UniversityChengdu 610031China College of Chemistry and Chemical Engineering Taiyuan University of TechnologyTaiyuan 030024China

Electrocatalytic reduction of Cr(Ⅵ)to less toxic Cr(Ⅲ)is deemed as a promising technique.Conventional electrocatalytic reduction is always driven by a constant cathodic potential,which exhibits a repelling action to Cr(Ⅵ)oxyanions in wastewater and consequently suppresses reduction kinetics.In order to remarkably accelerate Cr(Ⅵ)electrocatalytic reduction,we applied a pulsed potential on an Fe^(2+)-NiFe LDH/NF electrode synthesized by in situ growth of Fe^(2+)-doped NiFe LDH nanosheets on Ni foam using a spontaneous redox reaction.Under anodic potential section,HCrO_(4)^(–) anions are adsorbed on the electrode surface and reduced to Cr(Ⅲ)by Fe^(2+).Then,Cr(Ⅲ)ions are desorbed from the electrode surface under coulombic force.The regeneration of Fe^(2+) and direct reduction of Cr(Ⅵ)are achieved under cathodic potential section.The pulsed potential can achieve complete elimination of Cr(Ⅵ)within 60 min at an initial concentration of 10 mg L^(-1),and the removal efficiency shows a 60%increase with respect to that under constant cathodic potential.

关键词： Hexavalent chromium Electrocatalytic reduction Pulsed potential NiFe LDH Fe cycle

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Oxygen vacancy self-doped single crystal-like TiO_(2) nanotube arrays for efficient light-driven methane non-oxidative coupling

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先进陶瓷(英文) 2023年第8期12卷 1577-1592页

作者： Jinbo Xue Jinyu li Zhe Sun Huimin li Huan Chang Xuguang Liu Husheng Jia Qi li Qianqian Shen Key Laboratory of Interface Science and Engineering in Advanced Materials Ministry of EducationTaiyuan University of TechnologyTaiyuan 030024China College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China Shanxi-Zheda Institute of Advanced Materials and Chemical Engineering Taiyuan 030032China School of Materials Science and Engineering Southwest Jiaotong UniversityChengdu 610031China

Photocatalytic non-oxidative coupling of methane(PNOCM)is a mild and cost-effective method for the production of multicarbon compounds.However,the separation of photogenerated charges and activation of methane(CH4)are the main challenges for this reaction.Here,single crystal-like TiO_(2) nanotubes(VO-p-TNTs)with oxygen vacancies(VO)and preferential orientation were prepared and applied to PNOCM.The results demonstrate that the significantly enhanced photocatalytic performance is mainly related to the strong synergistic effect between preferential orientation and VO.The preferential orientation of VO-p-TNT along the[001]direction reduces the formation of complex centers at grain boundaries as the form of interfacial states and potential barriers,which improves the separation and transport of photogenerated carriers.Meanwhile,VO provides abundant coordination unsaturated sites for CH4 chemisorption and also acts as electron traps to hinder the recombination of electrons and holes,establishing an effective electron transfer channel between the adsorbed CH4 molecule and photocatalyst,thus weakening the C–H bond.In addition,the introduction of VO broadens the light absorption range.As a result,VO-p-TNT exhibits excellent PNOCM performance and provides new insights into catalyst design for CH4 conversion.

关键词： TiO_(2)nanotubes(TNTs) oxygen vacancies(VO) preferential orientation photocatalytic non-oxidative coupling of methane(PNOCM)

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Features of hyperintense white matter lesions and clinical relevance in systemic lupus erythematosus

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Chinese Medical Journal 2022年第8期135卷 962-970页

作者： Qian Guo Yang He Xia liu xuguang Gao Jing Xu Xue li Yue Sun Yajuan Xiang Ru li Zhanguo li Department of Rheumatology and Immunology Peking University People's HospitalBeijing 100044China Department of Rheumatology and Immunology Peking University International HospitalBeijing 102206China Department of Neurology Peking University People's HospitalBeijing 100044China Department of Radiology Peking University People's HospitalBeijing 100044China

Background: Systemic lupus erythematosus (SLE) is a multisystem autoimmune disease characterized by complex and various clinical manifestations. The study aimed to analyze clinical features and cerebral magnetic resonance imaging (MRI) changes of hyperintense white matter (WM) lesions in SLE patients.Methods: This was a retrospective study based on a consecutive cohort of 1191 SLE patients;273 patients for whom cerebral MRI data were available were enrolled to assess hyperintense WM lesions associated with SLE. Patients were assigned to two groups, ie, with or without hyperintense WM lesions. The MRI assessment showed that the hyperintense WM lesions could be classified into three categories: type A, periventricular hyperintense WM lesions;type B, subcortical hyperintense WM lesions;and type C, multiple discrete hyperintense WM lesions. The clinical and MRI characteristics were analyzed. Factors related to hyperintense WM lesions were identified by multivariate logistic regression analysis.Results: Among the 273 SLE patients with available cerebral MRI scans, 35.9% (98/273) had hyperintense WM lesions associated with SLE. The proportions of types A, B, and C were 54.1% (53/98), 11.2% (11/98), and 92.9% (91/98), respectively. Fifty-one percents of the patients showed an overlap of two or three types. Type C was the most common subgroup to be combined with other types. Compared with those without hyperintense WM lesions, the patients with hyperintense WM lesions were associated with neuropsychiatric SLE (NPSLE), lupus nephritis (LN), hypertension, and hyperuricemia (P = 0.002,P = 0.018,P = 0.045, andP = 0.036, respectively). Significantly higher rates of polyserous effusions and cardiac involvement were found in the patients with hyperintense WM lesions (P = 0.029 andP = 0.027, respectively), and these patients were more likely to present with disease damage (P < 0.001). In addition, the patients with hyperintense WM lesions exhibited a higher frequency of proteinuria (P = 0.009) and higher levels of CD8+ T cells (

关键词： Systemic lupus erythematosus Hyperintense white matter lesions Magnetic resonance imaging

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