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Sources and Ecological Risks of Heavy Metals in Soils Under Different Land Uses in Bangladesh

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Pedosphere 2019年第5期29卷 665-675页

作者： mohammad Saiful ISLAM mohammad Kawser AHMED mohammad Habibullah al-mamun Shah mohammad Asraful ISLAM Department of Soil Science Patuakhali Science and Technology UniversityDumkiPatuakhali 8602 (Bangladesh) Environment and Information Sciences Yokohama National UniversityYokohama 240-8501 (Japan) Department of Oceanography University of DhakaDhaka 1000 (Bangladesh) Department of Fisheries University of DhakaDhaka 1000 (Bangladesh) Department of Plant Pathology Patuakhali Science and Technology UniversityDumkiPatuakhali 8602 (Bangladesh)

Soil heavy metal pollution, influenced by both natural and anthropogenic factors, significantly reduces environmental quality. In this study, Cr, Ni, Cu, As, Cd, and Pb in eight different land-use soils from Patuakhali District in Bangladesh were assessed. Concentrations of Cr, Ni, Cu, As, Cd, and Pb in soils were 1-87, 5-271, 4-181, 0-80, 0.2-24.0, and 5-276 mg kg-1, respectively, measured using an inductively coupled plasma-mass spectrometer. The enrichment factor, pollution load index (PLI), and contamination factor (CJ) of metal i were used to assess the ecological risk posed by metals in soils. The PLI ranged from 0.78 to 2.66, indicating baseline levels to progressive deterioration of soil due to metal contamination. However, C;of Cd ranged from 1.8 to 12.0, which showed that the studied soils were strongly impacted by Cd. Considering the severity of the potential ecological risk of a single metal, the descending order was Cd > As > Pb > Cu > Ni > Cr. Soils under all land uses showed moderate to very high potential ecological risk.

关键词： Cd contamination factor degree of contamination enrichment factor environmental quality pollution load index soil deterioration soil pollution

Enhanced Thermochemical H_2 Production on Ca-Doped Lanthanum Manganite Perovskites Through Optimizing the Dopant Level and Re-oxidation Temperature

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Acta Metallurgica Sinica(English Letters) 2018年第4期31卷 431-439页

作者： Lulu Wang mohammad al-mamun Porun Liu Yu Lin Zhong Yun Wang Hua Gui Yang Huijun Zhao Centre for Clean Environment and Energy Gold Coast Campus Griffith University Key Laboratory for Ultrafine Materials of Ministry of Education School of Materials Science and EngineeringEast China University of Science and Technology Centre for Environmental and Energy Nanomaterials Institute of Solid State Physics Chinese Academy of Sciences

Perovskite material is one of the promising classes of redox catalysts for hydrogen production through two-step ther-mochemical H20 ***,an analogue of La1-xCaxMnO3 perovskite was systematically investigated as a catalyst for thermochemical H2 *** Ca doping level（x = 0.2,0.4,0.6,0.8）and re-oxidation temperature were com-prehensively optimized for the improvement of catalytic *** to our experimental results,La0.6-Ca0.4MnO3 perovskite displayed the highest yield of H2 at the re-oxidation temperature of 900℃ and the obtained H2 production was -10 times higher than that of the benchmark ceria catalyst under the same experimental *** importantly,Lao.6Ca0.4MnO3 perovskite catalyst exhibited impressive cyclic stability in repetitive O2 and H2 test.

关键词： Thermochemical water splitting Hydrogen production Perovskite oxides Dopant level Re-oxidationtemperature

Converting Co^(2+)-impregnated g-C_(3)N_(4) into N-doped CNTs-confined Co nanoparticles for efficient hydrogenation rearrangement reactions of furanic aldehydes

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Nano Research 2021年第8期14卷 2846-2852页

作者： Dongdong Wang mohammad al-mamun Wanbing Gong Yang Lv Chun Chen Yue Lin Guozhong Wang Haimin Zhang Huijun Zhao Key Laboratoryals Physics Centre for Environmental and Energy NanomaterialsAnhui Key Laboratory of Nanomaterials and NanotechnologyCAS Centre for Excellence in NanoscienceInstitute of Solid State PhysicsChinese Academy of SciencesHefei 230031China University of Science and Technology of China Hefei 230026China Centre for Clean Environment and Energy Gold Coast CampusGriffith UniversityQueensland 4222Australia Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China

The cyclopentanone and derivatives are a class of crucial fine chemicals for various industries and currently produced by conventional petrochemical synthetic ***,we demonstrated a new synthetic approach to directly fabricate N-doped carbon nanotube(N-CNTs)networks with confined Co nanoparticles from Co^(2+)-impregnated bulk g-C_(3)N_(4) as high performance hydrogenation rearrangement(HR)catalyst to efficiently convert a wide spectrum of biomass-derived furanic aldehydes to the corresponding cyclopentanones in water under a record-low H2 pressure of 0.5 MPa and mild *** unveiled a Co-catalysed bulk g-C_(3)N_(4) decomposition/carbonisation CNTs formation mechanism.A new HR pathway was also unveiled.

关键词： g-C_(3)N_(4) Co nanoparticles carbon nanotubes hydrogenation rearrangement furanic aldehydes

Carbon-encapsulated heazlewoodite nanoparticles as highly efficient and durable electrocatalysts for oxygen evolution reactions

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Nano Research 2017年第10期10卷 3522-3533页

作者： mohammad al-mamun Huajie Yin Porun Liu Xintai Su Haimin Zhang Huagui Yang Dan Wang Zhiyong Tang Yun Wang Huijun Zhao Centre for Clean Environment and Energy Griffith University Gold Coast Campus QLD 4222 Austrafia Ministry Key Laboratory of Oil and Gas Fine Chemicals College of Chemistry and Chemical Engineering Xinjiang University Urumqi 830046 China Centre for Environmental and Energy Nanomaterials Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031 China

The activity and durability of electrocatalysts are important factors in their practical applications, such as electrocatalytic oxygen evolution reactions （OERs） used in water splitting cells and metal-air batteries. In this study, a novel electrocatalyst, comprising few-layered graphitic carbon （-5 atomic layers） encapsulated heazlewoodite （Ni3S2@C） nanoparticles （NPs）, was designed and synthesized using a one-step solid phase pyrolysis method. In the OER test, the Ni3S2@C catalyst exhibited an overpotential of 298 mV at a current density of 10 mA·cm^-2, a Tafel slope of 51.3 mV·dec^-1, and charge transfer resistance of 22.0 Ω, which were better than those of benchmark RuO2 and most nickel- sulfide-based catalysts previously reported. This improved performance was ascribed to the high electronic conductivity of the graphitic carbon encapsulating layers. Moreover, the encapsulation of graphitic carbon layers provided superb stability without noticeable oxidation or depletion of Ni3S2 NPs within the nanocomposite. Therefore, the strategy introduced in this work can benefit the development of highly stable metal sulfide electrocatalysts for energy conversion and storage applications, without sacrificing electrocatalytic activity.

关键词： heazlewoodite electrocatalyst encapsulation oxygen evolution reaction pyrolysis graphitic carbon

Hetero-interfacial nickel nitride/vanadium oxynitride porous nanosheets as trifunctional electrodes for HER,OER and sodium ion batteries

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Journal of Energy Chemistry 2023年第6期81卷 71-81,I0003页

作者： Tuzhi Xiong Jingting Li Jagadish Chandra Roy Malcolm Koroma Zhixiao Zhu Hao Yang Lei Zhang Ting Ouyang M.-Sadeeq Balogun mohammad al-mamun College of Materials Science and Engineering Hunan Joint International Laboratory of Advanced Materials and Technology for Clean EnergyHunan UniversityChangsha 410082HunanChina Centre for Catalysis and Clean Energy Griffith UniversityGold Coast CampusSouthportQLD 4222Australia College of Mechanical and Vehicle Engineering Hunan UniversityChangsha 410082HunanChina Guangxi Key Laboratory of Electrochemical Energy Materials School of Chemistry&Chemical EngineeringGuangxi UniversityNanning 530004GuangxiChina Guangxi Key Laboratory of Information Materials Guilin University of Electronic TechnologyGuilin 541004GuangxiChina

The development of single electrode with multifunctional purposes for electrochemical devices remains a symbolic challenge in recent *** work explores interfacially-rich transition metal nitride hybrid that consist of nickel nitride and vanadium oxynitride(VO_(0.26)N_(0.52))on robust carbon fiber(denoted CF/Ni_(3)N/VON)as trifunctional electrode for hydrogen evolution reaction(HER),oxygen evolution reaction(OER),and sodium ion batteries(SIBs).The as-prepared CF/Ni_(3)N/VON exhibits low HER overpotential of 48 m V@10 m A cm^(-2),OER overpotential of 287 m V@10 m A cm^(-2),and sodium-ion anode storage reversible capacity of 555 m A h g^(-1)@0.2 *** analyses reveal that the Ni_(3)N effectively facilitates hydrogen desorption for HER,increases the electrical conductivity for OER,and promotes the Na-ion storage intercalation process,while the VON substantially elevates the water dissociation kinetics for HER,accelerates the adsorption of OH*intermediate for OER and enhances the Na-ion surface adsorption storage *** to the excellent HER and OER performances of the CF/Ni_(3)N/VON electrode,an overall water splitting device denoted as CF/Ni_(3)N/VON//CF/Ni_(3)N/VON was not only assembled showing an operating voltage of 1.63 V at current density of 10 m A cm^(-2)but was also successfully self-powered by the assembled CF/Ni_(3)N/VON//CF/Na_(3)V_(2)(PO_(4))_(3) flexible sodium ion *** work will contribute to the development of efficient and cost-effective flexible integrated electrochemical energy devices.

关键词： Interstitial nitride Trifunctional electrode Heterointerface alkaline water splitting Sodium ion battery

La_(1-x)Ca_xMn_(1-y)al_yO_3 perovskites as efficient catalysts for two-step thermochemical water splitting in conjunction with exceptional hydrogen yields

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Chinese Journal of Catalysis 2017年第6期38卷 1079-1086页

作者： Lulu Wang mohammad al‐mamun Porun Liu Yun Wang Hua Gui Yang Huijun Zhao Centre for Clean Environment and Energy Griffith University Gold Coast Campus QLD 4222 Australia Key Laboratory for Ultrafine Materials of Ministry of Education School of Materials Science and Engineering East China University of Science and Technology Shanghai 200237 China Centre for Environmental and Energy Nanomaterials Institute of Solid State Physics Chinese Academy of Sciences Hefei 230031 Anhui China

Solar‐driven thermochemical water splitting represents one efficient route to the generation of H2as a clean and renewable *** to their outstanding catalytic abilities and promising solar fuel production capacities,perovskite‐type redox catalysts have attracted significant attention in this *** the present study,the perovskite series La1‐xCaxMn1‐yalyO3(x,y=0.2,0.4,0.6,or0.8)was fabricated using a modified Pechini method and comprehensively investigated to determine the applicability of these materials to solar H2production via two‐step thermochemical water *** thermochemical redox behaviors of these perovskites were optimized by doping at either the A(Ca)or B(al)sites over a broad range of substitution values,*** this doping,a highly efficient perovskite(La0.6Ca0.4Mn0.6al0.4O3)was developed,which yielded a remarkable H2production rate of429μmol/g during two‐step thermochemical H2O splitting,going between1400and1000°***,the performance of the optimized perovskite was found to be eight times higher than that of the benchmark catalyst CeO2under the same experimental ***,these perovskites also showed impressive catalytic stability during two‐step thermochemical cycling *** newly developed La1‐xCaxMn1‐yalyO3redox catalysts appear to have great potential for future practical applications in thermochemical solar fuel production.

关键词： Two‐step thermochemical route Water splitting Solar fuel Perovskite‐type redox catalyst Hydrogen production

Effects of yeast and yeast cell wall polysaccharides supplementation on beef cattle growth performance, rumen microbial populations and lipopolysaccharides production

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Journal of Integrative Agriculture 2020年第3期19卷 810-819页

作者： PENG Quan-hui CHENG Long KANG Kun Tian Gang mohammad al-mamun XUE Bai WANG Li-zhi ZOU Hua-wei Mathew Gitau Gicheha WANG Zhi-sheng Key Laboratory of Bovine Low-Carbon Farming and Safe Production Institute of Animal NutritionSichuan Agricultural UniversityChengdu 611130P.R.China Faculty of Veterinary and Agricultural Sciences The University of MelbourneVictoria 3647Australia Angel Yeast Co. Ltd.Yichang 443000P.R.China Department of Animal Nutrition Bangladesh Agricultural UniversityMymensingh 2202Bangladesh Department of Animal Sciences Jomo Kenyatta University of Agriculture and TechnologyNairobi P.O.Box 62000-00200Kenya

This experiment was conducted to investigate the effects of live yeast and yeast cell wall polysaccharides on growth performance,rumen function and plasma lipopolysaccharides(LPS) content and immunity parameters of beef *** Qinchuan cattle were randomly assigned to one of four treatments with 10 replicates in each *** dietary treatments were: control diet(CTR),CTR supplemented with 1 g live yeast(2×10^10 live cell g^-1 per cattle per day(YST1),CTR supplemented with 2 g live yeast per cattle per day(YST2) and CTR supplemented with 20 g of yeast cell wall polysaccharides(30.0%≤β-glucan≤35.0%,and 28.0%≤mannanoligosaccharide≤32.0%) per cattle per day(YCW).The average daily gain was higher(P=0.023) and feed conversion ratio was lower(P=0.042) for the YST2 than the *** digestibility of neutral detergent fiber(P=0.039) and acid detergent fiber(P=0.016) were higher in yeast supplemented *** acetic acid:propionic acid of the YST2 was lower compared with the CTR(P=0.033).Plasma LPS(P=0.032),acute phase protein haptoglobin(P=0.033),plasma amyloid A(P=0.015) and histamine(P=0.038) were lower in the YST2 compared with the *** copies of fibrolytic microbial populations such as Fibrobacter succinogenes S85,Ruminococcus albus 7 and Ruminococcus flavefaciens FD-1 of the YST2 were higher(Pal lactate producing bacteria Streptococcus bovis JB1 was lower(Pal fermentation characteristics,microbial populations,immunity indices and total tract nutrient *** is concluded that the YST2 could promote fibrolytic microbial populations,decrease starch-utilizing bacteria,reduce LPS production in the rumen and LPS absorption into plasma and decrease inflammatory parameters,which can lead to an improvement in growth performance in beef cattle.

关键词： live yeast fiber degradability rumen fermentation immunity indices

Ru(bpy)_(3)^(2+)-sensitized{001}facets LiCoO_(2) nanosheets catalyzed CO_(2) reduction reaction with 100% carbonaceous products

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Nano Research 2022年第2期15卷 1061-1068页

作者： Shuaiyu Jiang Junxian Liu Kun Zhao Dandan Cui Porun Liu Huajie Yin mohammad al-mamun Sean ELowe Weiping Zhang Yu Lin Zhong Jun Chen Yun Wang Dan Wang Huijun Zhao Centre for Catalysis and Clean Energy Gold Coast campusGriffith UniversityQLD 4222Australia Intelligent Polymer Research Institute and ARC Centre of Excellence for Electromaterials Science University of WollongongWollongongNSW 2500Australia Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control Guangzhou Key Laboratory of Environmental Catalysis and Pollution ControlSchool of Environmental Science and EngineeringInstitute of Environmental Health and Pollution ControlGuangdong University of TechnologyGuangzhou 510006China State Key Laboratory of Biochemical Engineering CAS Centre for Excellence in NanoscienceInstitute of Process EngineeringChinese Academy of ScienceBeijing 100190China

Photosensitized heterogeneous CO_(2) reduction(PHCR)has emerged as a promising means to convert CO_(2) into valuable chemicals,however,challenged by the relatively low carbonaceous product selectivity caused by the competing hydrogen evolution reaction(HER).Here,we report a PHCR system that couples Ru(bpy)32+photosensitizer with{001}faceted LiCoO_(2) nanosheets photocatalyst to simultaneously yield 21.2 and 722μmol·g^(-1)·h^(-1) of CO,and 4.42 and 108μmol·g^(-1)·h^(-1) of CH4 under the visible light and the simulated sunlight irradiations,respectively,with completely suppressed *** experimental and theoretical studies reveal that the favored CO_(2) adsorption on the exposed Li sites on{001}faceted LiCoO_(2) surface is responsible for the completely suppressed HER.

关键词： homogeneous-heterogeneous catalysis system ultrathin LiCoO_(2)nanosheets photocatalytic CO_(2)reduction suppressed hydrogen evolution reaction

The role of electrolyte acid concentration in the electrochemical exfoliation of graphite:Mechanism and synthesis of electrochemical graphene oxide

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Nano Materials Science 2019年第3期1卷 215-223页

作者： Sean E.Lowe Ge Shi Yubai Zhang Jiadong Qin Lixue Jiang Shuaiyu Jiang mohammad al-mamun Porun Liu Yu Lin Zhong Huijun Zhao Centre for Clean Environment and Energy School of Environment and Science Griffith University

Electrochemistry has emerged as a major route for graphene and graphene oxide synthesis from *** graphite oxidation is commonly used with dilute mineral acid or aqueous salt *** this system,the electrolyte acid concentration appears to be a critical ***,the effect of the acid concentration,particularly at low concentrations,is still not fully *** address this issue,we used a packed bed electrochemical reactor to synthesize seven different electrochemical graphite oxide(EGO)products in 2–16M sulfuric *** XRD,XPS,Raman,conductivity and optical microscopy analysis of the products was carried *** found dilute acid(alline and less oxidized than those produced in stronger *** oxygen evolution reaction at the graphite surface appears to affect the structural changes,oxidation mechanism,and electrochemical corrosion of the *** conductivity is also strongly affected by the electrolyte’s *** show that well oxidized,yet reasonably conductive,single layer graphene oxide can be produced from 7.1M *** results broaden our understanding of graphite electrochemistry and will serve to inform future electrochemical graphene synthesis efforts.

关键词： Electrochemistry Graphene Graphene oxide Synthesis Exfoliation