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Efficient visible light photo-Fenton-like degradation of organic pollutants using in situ surface-modified BiFeO_3 as a catalyst

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Journal of Environmental Sciences 2013年第6期25卷 1213-1225页

作者： Junjian An lihua zhu Yingying Zhang Heqing Tang College of Chemistry and Chemical Engineering Huazhong University of Science and Technology Key Laboratory of Catalysis and Materials Science of the State Ethnic Affairs Commission and Ministry of Education College of Chemistry and Materials ScienceSouth-Central University for Nationalities

The visible light photo-Fenton-like catalytic performance of BiFeO3 nanoparticles was investigated using Methyl Violet （MV）, Rhodamine B （RhB） and phenol as probes. Under optimum conditions, the pseudo first-order rate constant （k） was determined to be 2.21 × 10^-2, 5.56 × 10^-2 and 2.01 × 10^-2 min〈 for the degradation of MV （30 μmol/L）, RhB （10 μmol/L） and phenol （3 mmol/L）, respectively, in the BiFeO3-H202-visible light （Vis） system. The introduction of visible light irradiation increased the k values of MV, RhB and phenol degradation 3.47, 1.95 and 2.07 times in comparison with those in dark. Generally, the k values in the BiFeO3- H202-Vis system were accelerated by increasing BiFeO3 load and H202 concentration, but decreased with increasing initial pollutant concentration. To further enhance the degradation of pollutants at high concentrations, BiFeO3 was modified with the addition of surface modifiers. The addition of ethylenediamineteraacetic acid （EDTA, 0.4 mmol/L） increased the k value of MV degradation （60 μmol/L） from 1.01 × 10.2 min^-1 in the BiFeO3-H202-Vis system to 1.30 min^-1 in the EDTA-BiFeO3-H2O2-Vis system by a factor of 128. This suggests that in situ surface modification can enable BiFeO3 nano-particles to be a promising visible light photo-Fenton-like catalyst for the degradation of organic pollutants.

关键词： nanoscale BiFeO3 visible light photo-Fenton-like catalysis degradation surface modification

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Chemical reductive technologies for the debromination of polybrominated diphenyl ethers: A review

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Journal of Environmental Sciences 2023年第5期127卷 42-59页

作者： Ming Lei Yao Tang lihua zhu Heqing Tang College of Resources and Environmental Science South-Central Minzu UniversityWuhan 430074China School of Chemistry and Chemical Engineering Huazhong University of Science and TechnologyWuhan 430074China

Polybrominated diphenyl ethers(PBDEs)are widely used as brominated flame retardants,which had attracted amounts of attention due to their harmful characteristics of high toxicity,environmental persistence and potential *** chemical reductive debromination technologies have been developed for the debromination of PBDEs,including photolysis,photocatalysis,electrocatalysis,zero-valent metal reduction,chemically catalytic reduction and mechanochemical *** review aims to provide information about the degradation thermodynamics and kinetics of PBDEs and summarize the degradation mechanisms in various *** to the comparative analysis,the rapid debromination to generate bromine-free products in an electron-transfer process,of which photocatalysis is a representative one,is found to be relatively difficult,because the degradation rate of PBDEs depended on the Br-rich phenyl ring with the lowest unoccupied molecular orbital(LUMO)*** the contrary,the complete debromination occurs easily in other systems with active hydrogen atoms as the main reactive species,such as chemically catalytic reduction *** review provides the knowledge on the chemical reductive technique of PBDEs,which would greatly help not only clarify the degradation mechanism but also design the more efficient system for the rapid and deep debromination of PBDEs in the future.

关键词： Polybrominated diphenyl ethers (PBDEs) Debromination Chemical reduction Electron transfer Hydrogenation

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Fractal-like Kinetic Characteristics of Coalbed Methane Hydrate Dissociation at Normal Pressure

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Chinese Journal of Chemistry 2011年第1期29卷 21-26页

作者： Xu, Feng Wu, Qiang zhu, lihua School of Safety Engineering & Technology Heilongjiang Institute of Science & Technology Harbin Heilongjiang 150027 China

Surface modality of coalbed methane hydrate and fractal-like kinetic characteristics of the hydrate dissociation at normal pressure have been studied by using fractal geometry theory. The results show that the surface modality of coalbed methane hydrate has fractal characteristic, and the dissociation kinetics of coalbed methane hydrate is fractal-like. Moreover, a new kinetic model for coalbed methane hydrate dissociation was proposed, and its reliability was validated.

关键词： coalbed methane hydrate dissociation kinetic normal pressure fractal

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Overview of guide RNA design tools for CRISPR-Cas9 genome editing technology

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Frontiers in Biology 2015年第4期10卷 289-296页

作者： lihua Julie zhu Department of Molecular Cell and Cancer Biology Program in Bioinformatics and Integrated Biology Program in Molecular MedicineUniversity of Massachusetts Medical School Worcester MA O1605 USA

CRISPR-Cas （Clustered, Regularly Interspaced, Short Palindromic Repeats - CRISPR-associated （Cas）） RNA guided endonuclease has emerged as the most effective and widely used genome editing technology, which has become the most exciting and rapidly advancing research field. Efficient genome editing by the CRISPR-Cas9 system has been demonstrated in many species, and several laboratories have established CRISPR-Cas9 as a screening tool for systematic genetic analysis, similar to sbRNA screening. At least three companies have been founded to leverage this technology for therapeutic uses. To facilitate the implementation of this technology, many software tools have been developed to identify guide RNAs that effectively target a desired genomic region. Here, I provide an overview of the technology, focusing on guide RNA design principles, available software tools and their strengths and weaknesses.

关键词： CRISPR-Cas9 genome editing gRNA design off-target analysis gRNA efficacy

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In situ speciation analysis and kinetic study of arsenic adsorption on ferrihydrite with surface-enhanced Raman spectroscopy

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Nano Research 2023年第2期16卷 3046-3054页

作者： Lei Ouyang Mingtao Wang lihua zhu Heqing Tang Qin Shuai State Key Laboratory of Biogeology and Environmental Geology Faculty of Materials Science and ChemistryChina University of GeosciencesWuhan 430074China School of Chemistry and Chemical Engineering Huazhong University of Science and TechnologyWuhan 430074China College of Resources and Environmental Science South Central University for NationalitiesWuhan 430074China

Arsenic pollution poses a serious threat to human health,and is one of the most concerning environmental problems *** adsorption,fixation,and dissolution behaviors of arsenic on the surface of iron-(hydr-)oxides influence the environmental routes of arsenic cycle *** inner-sphere and outer-sphere adsorption configurations of arsenic on iron oxides have been proposed based on X-ray adsorption ***,there is no systematic study on the in situ speciation analysis and adsorption kinetics of these species at such interfaces,because of the lack of an efficient monitoring *** correlation of surface speciation and environmental stability is still ***,a shell-isolated SiO_(2)@Ag@Au-based surface-enhanced Raman spectroscopy(SERS)platform was developed for speciation analysis of the adsorbed arsenic species by eliminating the chemical interaction between arsenic and *** ferrihydrite as a typical iron oxide,the intrinsic Raman spectra of the inner-sphere(~830 cm^(−1))and outer-sphere(~660 cm^(−1))complexes at the adsorption interface were *** the first time,the in situ kinetic monitoring of the formation and transformation of these species was *** correlating the speciation to the sequential extraction results,the environmental stability of arsenic on ferrihydrite was shown to be closely related to the adsorption *** was shown that stability can be significantly promoted by transforming loosely bonded species(outer-sphere complexes)into inner-sphere *** work demonstrated the applicability of SERS with shell-isolated plasmonic particles for arsenic geochemical cycle monitoring and mechanism *** also provided a convenient tool for developing effective strategies for arsenic pollutant control and abatement.

关键词： arsenic surface-enhanced Raman spectroscopy ferrihydrite in situ analysis outer-sphere complex

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Carbonate-induced enhancement of phenols degradation in CuS/peroxymonosulfate system: A clear correlation between this enhancement and electronic effects of phenols substituents

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Journal of Environmental Sciences 2023年第7期129卷 139-151页

作者： Xiaobo Wang Yu Zhou Nan Wang Jindong Zhang lihua zhu College of Chemistry and Chemical Engineering Huazhong University of Science and TechnologyWuhan 430074China College of Chemistry and Chemical Engineering Hubei Polytechnic UniversityHuangshi 435003China

This study investigated the enhancement effects of dissolved carbonates on the peroxymonosulfate-based advanced oxidation process with CuS as a *** was found that the added CO_(3)^(2−)increased both the catalytic activity and the stability of the *** optimized reaction conditions in the presence of CO_(3)^(2−),the degradation removal of 4-methylphenol(4-MP)within 2 min reached 100%,and this was maintained in consecutivemulti-cycle *** degradation rate constant of 4-MP was 2.159 min^(−1),being 685%greater than that in the absence of CO_(3)^(2−)(0.315 min−1).The comparison of dominated active species and 4-MP degradation pathways in both CO_(3)^(2−)-free and CO_(3)^(2−)-containing systems suggested thatmore CO_(3)·^(−)/^(1)O_(2) was produced in the case of CO_(3)^(2−)deducing an electron transfer medium,which tending to react with ***,Characterization by X-ray photoelectron spectroscopic and cyclic voltammetrymeasurement verified CO_(3)^(2−)enabled the effective reduction of Cu^(2+)to Cu^(+).By investigating the degradation of 11 phenolics with different substituents,the dependence of degradation kinetic rate constant of the phenolics on their chemical structures indicated that there was a good linear relationship between the Hammett constantsσp of the aromatic phenolics and the logarithm of k in the CO_(3)^(2−)-containing *** work provides a new strategy for efficient removal of electron-rich moieties under the driving of carbonate being widely present in actual water bodies.

关键词： Carbonates Enhancement Catalytic degradation Phenolic pollutants Electronic effects

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A Novel Design of Mechanical Switch for the High Overload Environment

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Computers, Materials & Continua 2020年第10期65卷 419-432页

作者： Yu Wang Chen Liu Lei Wang lihua zhu School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing210094China School of Computing and Information Technology University of WollongongWollongongNSW 2522Australia

The internal structure of the inertial measurement unit(IMU)in active state is easily damaged in the high overload *** that the IMU is usually required to be powered within the disappearance of the high *** this paper,a mechanical switch is designed to enable the IMU based on the analysis of the impact of high overload on the power-supply *** which,parameters of mechanical switch are determined through theoretical calculation and data *** innovation of the proposed structure lies in that the mechanical switch is triggered through the high overload process and could provide a delay signal for the *** all,the proposed switch is tested through mechanical simulation,impact test and practical *** experimental results show that the designed mechanical switch can effectively and reliably provide the delay for the circuit and guarantee operation of the IMU under high overload.

关键词： High overload environment mechanical switch power-supply circuit circuit delayed closing data analysis

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Design of Automatic Batch Calibration and Correction System for IMU

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Computers, Materials & Continua 2022年第4期71卷 1489-1501页

作者： lihua zhu Qifan Yun Zhiqiang Wu Cheire Cheng School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing210000China Department of Electrical and Electronic Engineering Colorado State UniversityColoradoUnited States

Thanks to its light weight,low power consumption,and low price,the inertial measurement units(IMUs)have been widely used in civil and military applications such as autopilot,robotics,and tactical *** calibration is an essential procedure before the IMU is put in use,which is generally used to estimate the error parameters such as the bias,installation error,scale factor of the ***,the manual one-by-one calibration is still the mostly used manner,which is low in efficiency,time-consuming,and easy to introduce *** at this issue,this paper designs an automatic batch calibration method for a set of *** designed automatic calibration master controller can control the turntable and the data acquisition system at the same *** data acquisition front-end can complete data acquisition of eight IMUs one *** various scenarios of experimental tests have been carried out to validate the proposed design,such as the multi-position tests,the rate tests and swaying *** results illustrate the reliability of each function module and the feasibility automatic batch *** with the traditional calibration method,the proposed design can reduce errors caused by the manual calibration and greatly improve the efficiency of IMU calibration.

关键词： MEMS inertial measurement unit batch calibration automatic calibration

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Stability Analysis of Transfer Alignment Filter Based on theμTheory

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Computers, Materials & Continua 2019年第6期59卷 1015-1026页

作者： lihua zhu Yu Wang Lei Wang Zhiqiang Wu School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing210094China School of Computing and Information Technology University of WollongongNorthfields AveWollongong NSW 2522Australia

The performance of the transfer alignment has great impact on inertial navigation *** the transfer alignment is generally implemented using a filter to compensate the errors,its accuracy,rapidity and anti-disturbance capability are key properties to evaluate the filtering *** terms of the superiority in dealing with the noise,H∞filtering has been used to improve the anti-disturbance capability of the transfer ***,there is still a need to incorporate system uncertainty due to various dynamic *** on the structural value theory,a robustness stability analysis method has been proposed for the transfer alignment to evaluate the impact of uncertainty on the navigation *** mathematical derivation has been elaborated in this paper,and the simulation has been carried out to verify the effectiveness of the algorithm.

关键词： Robustness stability transfer alignment inertial navigation system μtheory

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The Identification of the Wind Parameters Based on the Interactive Multi-Models

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Computers, Materials & Continua 2020年第10期65卷 405-418页

作者： lihua zhu Zhiqiang Wu Lei Wang Yu Wang School of Mechanical Engineering Nanjing University of Science and TechnologyNanjing210094China School of Computing and Information Technology University of WollongongWollongongNSW 2522Australia

The wind as a natural phenomenon would cause the derivation of the pesticide drops during the operation of agricultural unmanned aerial vehicles(UAV).In particular,the changeable wind makes it difficult for the precision *** accurate spraying of pesticide,it is necessary to estimate the real-time wind parameters to provide the correction reference for the UAV *** estimation algorithms are model based,and as such,serious errors can arise when the models fail to properly fit the physical wind *** address this problem,a robust estimation model is proposed in this *** the diversity of the wind,three elemental time-related Markov models with carefully designed parameterαare adopted in the interacting multiple model(IMM)algorithm,to accomplish the estimation of the wind ***,the estimation accuracy is dependent as well on the filtering *** that regard,the sparse grid quadrature Kalman filter(SGQKF)is employed to comprise the computation load and high filtering ***,the proposed algorithm is ran using simulation tests which results demonstrate its effectiveness and superiority in tracking the wind change.

关键词： IMM algorithm wind parameter estimation the Singer model SGQKF

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