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An improved method that incorporates the estimated runoff for peak discharge prediction on the Chinese Loess Plateau

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International Soil and Water Conservation Research 2023年第2期11卷 290-300页

作者： Wenhai Shi Miaomiao Wang Donghao Li Xianwei Li Mengying Sun key laboratory of subsurface hydrology and ecological effects in arid region Chang'an UniversityMinistry of EducationChina School of Water and Environment Chang'an UniversityChina

An accurate prediction of peak discharge in watersheds is critical not only for water resource manage-ment,but also for understanding the complex relationships of hydrological processes.In this study,a modified peak discharge formula based on the Chemicals,Runoff,and Erosion from Agricultural Man-agement Systems(CREAMS)model was developed by introducing rainfall intensity and soil moisture factors.The reliability of the proposed method was tested with data from 1464 storm events in 41 watersheds and was applied to 256 storm events in five remaining typical watersheds using the opti-mized parameters.The results indicate that the proposed method is highly accurate in terms of model efficiency,as determined by Nash-Sutcliffe efficiencies(NSEs)of 88.60%,74.04%,and 90.12%during the calibration,validation,and application cases,respectively.Furthermore,it performed better than the original and modified CREAMS methods.Subsequently,using the parameters derived from the initial 41 watersheds and the runoff estimated using the modified Soil Conservation Service curve number(SCS-CN)method,the proposed method was used to predict the peak discharge from the last five typical watersheds.Large NSE(63.88-80.83%)and low root mean square error(RMSE)values(0.31-35.93 m^(3)s^(-1))were obtained for the five watersheds.Overall,the proposed peak discharge model,combined with the modified SCS-CN method,may accurately predict event-based peak discharge and runoff for general applications under various hydrological and geomorphic conditions in the Loess Plateau region.

关键词： Chemicals,Runoff,and Erosion from agricultural management systems (CREAMS) NRCS-CN Peak discharge Surface runoff Rainfall intensity

A review on SnFe2O4 and their composites: Synthesis, properties, and emerging applications

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Progress in Natural Science:Materials International 2022年第5期32卷 517-527页

作者： Hongru Han Yi Luo Yuefa Jia N.Hasan Chunli Liu School of Water and Environment Chang'an University key laboratory of subsurface hydrology and ecological effects in arid region (Chang'an University) Department of Physics and Oxide Research Center Hankuk University of Foreign Studies

Tin ferrite(SnFe2O4) and their composites have been extensively studied due to their unique functional properties including appealing electronic band structure, good chemical stability, high magnetization, excellent biocompatible and earth-abundant nature. Over the past few years, SnFe2O4and their composites have been well designed and investigated for various kind of applications. In this review, the most important methods for SnFe2O4and their composites synthesis, such as co-precipitation, hydrothermal, solvothermal and sol-gel techniques are summarized. It is important to emphasize that this review mainly focuses on the application of SnFe2O4and their composites for environmental remediation, lithium-ion batteries and hydrogen peroxide sensors, which are discussed in detail for the first time. Apart from that, the key factors and essential means to improve their performance and functionality are systematically reported. Finally, the development prospect and challenge of SnFe2O4and their composites are introduced. It is anticipated that this review will be helpful in development of SnFe2O4and their composites with ameliorated performances for practical application in various fields.

关键词： SnFe 2 O 4 Synthesis Environmental remediation Lithium-ion batteries Hydrogen peroxide sensors

Construction of ternary CuO/CuFe_(2)O_(4)/g-C_(3)N_(4)composite and its enhanced photocatalytic degradation of tetracycline hydrochloride with persulfate under simulated sunlight

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Journal of Environmental Sciences 2022年第2期34卷 59-70页

作者： Lei Wang Xiaolei Ma Guofang Huang Rui Lian Jingwei Huang Houde She Qizhao Wang Gansu International Scientific and Technological Cooperation Base of Water-Retention Chemical Functional Materials College of Chemistry and Chemical EngineeringNorthwest Normal UniversityLanzhou 730070China School of Environmental Science and Engineering Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region of Ministry of EducationChang'an UniversityXi'an 710054China

In this study,a graphitic carbon nitride(g-C_(3)N_(4))based ternary catalyst Cu O/Cu Fe_(2)O_(4)/gC_(3)N_(4)(CCCN)is successfully prepared thorough calcination method.After confirming the structure and composition of CCCN,the as-synthesized composites are utilized to activate persulfate(PS)for the degradation of organic contaminant.While using tetracycline hydrochloride(TC)as pollutant surrogate,the effects of initial p H,PS and catalyst concentration on the degradation rate are systematically studied.Under the optimized reaction condition,CCCN/PS is able to give 99%degradation extent and 74%chemical oxygen demand removal in assistance of simulated solar light,both of which are apparently greater than that of either Cu O/Cu Fe_(2)O_(4)and pristine g-C_(3)N_(4).The great improvement in degradation can be assignable to the effective separation of photoinduced carriers thanks to the integration between Cu O/Cu Fe_(2)O_(4)and g-C_(3)N_(4),as well as the increased reaction sites given by the g-C_(3)N_(4)substrate.Moreover,the scavenging trials imply that the major oxidative matters involved in the decomposition are hydroxyl radicals(·OH),superoxide radicals(·O_(2)^(-))and photo-induced holes(h^(+)).

关键词： Copper ferrite Graphitic carbon nitride Heterojunction photocatalyst Peroxydisulfate Tetracycline hydrochloride

Homojunction photocatalysts for water splitting

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Nano Research 2022年第12期15卷 10171-10184页

作者： Xiangjiu Guan Shichao Zong Shaohua Shen International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi’an Jiaotong UniversityXi’an710049China Suzhou Academy of Xi’an Jiaotong University Suzhou215123China key laboratory of subsurface hydrology and ecological effects in arid region Ministry of EducationSchool of Water and EnvironmentChang’an UniversityXi’an710064China

Charge-carrier separation is regarded as one of the critical issues of photocatalytic water splitting and could be accelerated by constructing microscopic junctions in photocatalysts.Homojunction photocatalysts consisting of different forms of semiconductor with identical compositions could inherit the advantages of heterojunction-based photocatalysts in charge separation due to the built-in electric field,while omitting the potential drawbacks of interfacial lattice distortion by providing continuous band bonding.Therefore,homojunction-based photocatalysts have recently drawn growing attention in water splitting.In this review,the synthetic approaches to preparing photocatalysts with various homojunction structures including p-n junction,phase junction,and facet junction were introduced,together with a comprehensive analysis and discussion on the latest progress in the application of photocatalytic water splitting.This review work is expected to inspire more related work with promoted research on designing efficient homojunction-based photocatalytic systems for water splitting.

关键词： photocatalytic water splitting homojunction charge separation

Boosting charge separation of BiVO_(4)photoanode modified with 2D metal-organic frameworks nanosheets for high-performance photoelectrochemical water splitting

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Chinese Chemical Letters 2023年第6期34卷 287-292页

作者： Lina Wang Zejun Liu Jinming Zhang Yuefa Jia Jingwei Huang Qiong Mei Qizhao Wang School of Water and Environment Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region of Ministry of EducationChang’an UniversityXi’an 710054China College of Chemistry and Chemical Engineering Northwest Normal UniversityLanzhou 730070China School of Land Engineering Chang’an UniversityXi’an 710054China

Water splitting by photoelectrochemical(PEC)processes to convert solar energy into hydrogen energy using semiconductors is regarded as one of the most ideal methods to solve the current energy crisis and has attracted widespread attention.Herein,Co-based metal-organic framework(Co(bpdc)(H_(2)O)_(4)(CoMOF)nanosheets as passivation layers were in-situ constructed on the surface of Bi VO_(4)films through an uncomplicated hydrothermal method(Co-MOF/Bi VO_(4)).Under AM 1.5G illumination,synthesized CoMOF/BiVO_(4)electrode exhibited a 4-fold higher photocurrent than bare Bi VO_(4),measuring 6.0 m A/cm^(2)at 1.23 V vs.RHE in 1 mol/L potassium borate electrolyte(pH 9.5)solution.Moreover,the Co-MOF/BiVO_(4)film demonstrated a 96%charge separation efficiency,a result caused by an inhibited recombination rate of photogenerated electrons and holes by the addition of Co-MOF nanosheets.This work provides an idea for depositing inexpensive 2D Co-MOF nanosheets on the photoanode as an excellent passivation layer for solar fuel production.

关键词： Photoelectrochemical BiVO_(4) Water splitting Co-MOF 2D nanosheets Charge separation

Adsorption behaviors of acetaminophen onto sediment in the Weihe River,Shaanxi,China

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International Journal of Sediment Research 2015年第3期30卷 263-271页

作者： Yue Zhao Shengke Yang Huihui Li Di Wang key laboratory of subsurface hydrology and ecological Effect in arid region of ministry of education Chang’an University

Adsorption behaviors of acetaminophen onto sediment in the Weihe River were described.The impact factors in the processes of adsorption,such as contact time,solution pH,temperature,and ionic strength,were determined by experiments.The experimental results were analyzed by kinetic and isotherm models.The adsorption kinetics was found to follow a pseudo-first-order model.The equilibrium adsorption data fitted well with the Langmuir and Freundlich isotherm models.However,the Langmuir isotherm was more suitable to describe the adsorption.Thermodynamics parameters such as Gibbs-free energy change(△C~0),enthalpy change(△H~0) and entropy change(△S~0) were calculated.Results showed that the adsorption was feasible,spontaneous,entropy increasing,and endothermic in nature,which reached equilibrium in about 24 hours.The adsorption capacity did not cause obvious change at solution pH 3.0-9.0,and decreased in solution pH 9.0-11.0.The presence of electrolytes such as NaCl in aqueous solution had a significant negative effect on the adsorption.The mechanisms controlling the adsorption were supposed to be chemisorption.

关键词： Adsorption Acetaminophen Sediment Kinetics Thermodynamics

Clogging mechanism in the process of reinjection of used geothermal water: A simulation research on Xianyang No.2 reinjection well in a super-deep and porous geothermal reservoir

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Journal of Groundwater Science and Engineering 2017年第4期5卷 311-325页

作者： MA Zhi-yuan XU Yong ZHAI Mei-jing WU Min School of Environmental Science and Engineering Chang'an University key laboratory of subsurface hydrology and ecological effects in arid region of the ministry of education Chang'an University

In the process of geothermal exploitation and utilization, the reinjection amount of used geothermal water in super-deep and porous reservoir is small and significantly decreases over time. This has been a worldwide problem, which greatly restricts the exploitation and utilization of geothermal resources. Based on a large amount of experiments and researches, the reinjection research on the tail water of Xianyang No.2 well, which is carried out by combining the application of hydrogeochemical simulation, clogging mechanism research and the reinjection experiment, has achieved breakthrough results. The clogging mechanism and indoor simulation experiment results show: Factors affecting the tail water reinjection of Xianyang No.2 well mainly include chemical clogging, suspended solids clogging, gas clogging, microbial clogging and composite clogging, yet the effect of particle migration on clogging has not been found; in the process of reinjection, chemical clogging was mainly caused by carbonates(mainly calcite), silicates(mainly chalcedony), and a small amount of iron minerals, and the clogging aggravated when the temperature rose; suspended solids clogging also aggravated when the temperature rose, which showed that particles formed by chemical reaction had a certain proportion in suspended solids.

关键词： Xianyang Super-deep and porous geothermal reservoir Reinjection Clogging mechanism

Enhanced performance of NiF_(2)/BiVO_(4)photoanode for photoelectrochemical water splitting

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Frontiers in Energy 2021年第3期15卷 760-771页

作者： Ziwei ZHAO Kaiyi CHEN Jingwei HUANG Lei WANG Houde SHE Qizhao WANG College of Chemistry and Chemical Engineering Northwest Normal UniversityLanzhou 730070China School of Water and Environment Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region of the Ministry of EducationChang’an UniversityXi’an 710054China

The serious surface charge recombination and fatigued photogenerated carriers transfer of the BiVO_(4)photoanode restrict its photoelectrochemical(PEC)water splitting performance.In this work,nickel fluoride(NiF_(2))is applied to revamp pure BiVO_(4)photoanode by using a facile electrodeposition method.As a result,the asprepared NiF_(2)/BiVO_(4)photoanode increases the dramatic photocurrent density by approximately 180%compared with the pristine BiVO_(4)photoanode.Furthermore,the correlative photon-to-current conversion efficiency,the charge injection,and the separation efficiency,as well as the hydrogen generation of the composite photoanode have been memorably enhanced due to the synergy of NiF_(2)and BiVO_(4).This study may furnish a dependable guidance in fabricating the fluoride-based compound/semiconductor composite photoanode system.

关键词： BiVO_(4) NiF_(2) heterojunction photoelectrochemical water splitting

Construction of TiO_(2)-covalent organic framework Z-Scheme hybrid through coordination bond for photocatalytic CO_(2) conversion

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Journal of Energy Chemistry 2022年第1期31卷 85-92,I0003页

作者： Lei Wang Guofang Huang Liang Zhang Rui Lian Jingwei Huang Houde She Chunli Liu Qizhao Wang key laboratory of Eco-Environment-Related Polymer Materials Gansu International Scientific and Technological Cooperation Base of Water-Retention Chemical Functional MaterialsCollege of Chemistry and Chemical EngineeringNorthwest Normal UniversityLanzhou 730070GansuChina key laboratory for Photonic and Electronic Bandgap Materials Ministry of EducationSchool of Physics and Electronic EngineeringHarbin Normal UniversityHarbin 150025HeilongjiangChina School of Environmental Science and Engineering Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region of Ministry of EducationChang'an University.Xi'an 710054ShaanxiChina Department of Physics Oxide Research Centerand Memory and Catalyst Research CenterHankuk University of Foreign StudiesYongin 17035Republic of Korea

In this work,a covalent organic framework(COF),which is constructed by the building blocks of[5,10,15,20-tetrakis(4-aminophenyl)porphinato]copper(Ⅱ)(CuTAPP)and p-benzaldehyde,is employed to integrate with TiO_(2) for the purpose of establishing a Z-scheme hybrid.Within the system,isonicotinic acid performs the role of a bridge that connects the two components through a coordination bond.Further photocatalytic application reveals the hybrid framework is able to catalyze CO_(2) conversion under simulated solar light,resulting in CO production rate of 50.5 μmol g^(-1)·h^(-1),about 9.9 and 24.5 times that of COF and pristine TiO_(2),respectively.The ameliorated catalytic performance owes much to the por-phyrin block acting as photosensitizer that augments the light absorbance,and the establishment of Z-scheme system between the inorganic and orga nic comp on ents that enhances the separati on of the carriers.In addition,the chemical bridge also ensures a steady usage and stable charge delivery in the catalysis.Our study sheds light on the development of versatile approaches to covalently in corporate COFs with inorga nic semic on ductors.

关键词： CuP-Ph COF TiO_(2) Sensitization Z-scheme CO_(2)reduction Photocatalysis