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Pyrolytic synthesis of graphene-encapsulated zero-valent iron nanoparticles supported on biochar for heavy metal removal

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Biochar 2022年第1期4卷 25-41页

作者： Tharindu N.Karunaratne RmOshani Nayanathara chanaka m.navarathna Prashan m.Rodrigo Rooban V.K.G.Thirumalai Charles U.Pittman Jr Yunsang Kim Todd mlsna Jilei Zhang Xuefeng Zhang Department of Sustainable Bioproducts Mississippi State UniversityMis-sissippi StateMS 39762USA. Department of Chemistry Mississippi State UniversityMississippi StateMS 39762USA. Institute for Imaging&Analytical Technologies Mississippi State UniversityMississippi StateMS 39762USA

Biochar(BC)-supported graphene-encapsulated zero-valent iron nanoparticle composites(BC-G@Fe0)are promising engineering nanocomposites that can be used to scavenge heavy metal from ***,the produc-tion of BC-G@Fe0 through carbothermal reduction using biomass as a carbon source remains challenging because of biomass pyrolysis ***,we examined two carbothermal reduction routes for preparing BC-G@Fe0 using bamboo as the carbon *** first route impregnated Fe ions(Fe^(2+)/^(3+))into unpyrolyzed bamboo parti-cles initially,followed by carbonization at 600-1000℃.This process produced BC-G@Fe0 dominated by iron carbide(Fe_(3)C),which led to low heavy metal removal efficiency(i.e.,Cu^(2+)capacity ofmmol g^(−1)).In the second route,bamboo particles were pyrolyzed(600℃)to biochar first,followed by impregnating this biochar with Fe ions,and then carbonized at 600-1000℃.This route produces zero-valent iron nanoparticles,which resulted in high heavy metal removal capacities(i.e.,0.30,1.58,and 1.91 mmol g^(−1)for Pb^(2+),Cu^(2+),and Ag+,respectively).The effects of car-bonization temperature(600-1000℃),iron source(i.e.,iron nitrates,iron sulfate,ferrous chloride,and ferric chloride),and iron loading(5-40%)on the morphology,structure,and heavy metal ion aqueous uptake performance of BC-G@Fe0 were also *** study revealed the formation mechanisms of BC-G@Fe0 through biomass carbother-mal reduction,which could guide the application-oriented design of multifunctional iron-BC composites for water remediation.

关键词： Bamboo Biochar Carbothermal reduction Fe3C metallic iron Heavy metal

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Pseudobrookite based heterostructures for efficient electrocatalytic hydrogen evolution

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materials Reports(Energy) 2021年第2期1卷 90-98页

作者： Niranjala Fernando Jayashree Swaminathan Francisco Carlos Robles Hernandez Gayan Priyadarshana chanaka Sandaruwan Wenli Yang Veranja Karunaratne Zixing Wang Gehan AJAmaratunga Nilwala Kottegoda Ashokkumar meiyazhagan Pulickel m.Ajayan Department of Design and Engineering Faculty of Science and TechnologyBournemouth UniversityDorsetBH125BBUK Department of materials Science&NanoEngineering Rice UniversityTexas77005USA Department of mechanical Engineering Technology University of HoustonHoustonTX77204USA materials Science&Engineering Cullen College of EngineeringUniversity of HoustonHoustonTX77204USA Department of materials and mechanical Technology Faculty of TechnologyUniversity of Sri JayewardenepuraPitipanaHomagamaSri Lanka Sri Lanka Institute of Nanotechnology PitipanaHomagamaSri Lanka Department of Engineering University of CambridgeCambridgeCB21TNUK Department of Chemistry Center for Advanced Materials ResearchUniversity of Sri JayewardenepuraGangodawilaNugegodaSri Lanka

Synthesis of ultrathin heterostructures has received much attention in the recent past due to their unique physical and chemical *** this work,we report the synthesis of Fe_(2)TiO_(5)–TiO_(2)heterostructures using a simple hydrothermal technique employing natural ilmenite as the *** arranged nanostructures with interconnected nano-petals of thickness around 50 nm are *** electrocatalytic properties of the synthesized Fe_(2)TiO_(5)–TiO_(2)heterostructures are enhanced following the cathodization *** observed enhancement in the synthesized materials’electrocatalytic property can be attributed to the defect-rich Fe_(2-x)TiO_(5-x)-TiO_(2-x)*** current approach and technique discussed in this work offer a simple method to synthesize a nanostructured heterostructure material and create defects for enhancing electrocatalytic activity.

关键词： Heterostructures Cathodization Green catalyst 2D materials Hydrogen evolution Electrocatalysis Pseudobrookite

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