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Biosynthesis of gold nanoparticles using aqueous extract of Ricinus cummunis leaves to augment catalytic degradation of organic dyes and study of its antifungal and antibacterial activities

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Particuology 2024年第4期87卷 87-98页

作者： Mrinalini Parmar Mallika Sanyal Department of Chemistry Gujarat UniversityAhmedabadGujarat 380009India St.Xaviers College NavrangpuraAhmedabadGujarat 380009India

In this study,biosynthesis of gold nanoparticles(Au NPs)using aqueous extract of fresh leaves of Ricinus cummunis plant is reported without the use of any synthetic chemical in the reaction process.The prepared NPs are mostly spherical in shape with some particles having triangular or hexagonal struc-tures.The average size of the particles as calculated using TEM data is 18 nm.The biosynthesised Au NPs were studied for their application in remediation of Congo Red,Methylene Blue,Reactive Red 120 and Rhodamine B dyes present in industrial effluents.The degradation of dyes was confirmed spectropho-tometrically using UV-Vis Spectrophotometer.Reactive Red 120 and Congo red dyes were most effec-tively reduced with 88%degradation.The Au NPs were further studied for their potential as an effective antifungal agent against fungal strains namely Candida albicans and Aspergillus fumigatus and antibac-terial properties against Bacillus subtilis(Gram+ve)and Pseudomonas aeruginosa(Gram-ve)bacterial strains.The MIC values being 7.8 and 15.6(μg/mL)for Bacillus subtilis and Pseudomonas aeruginosa respectively.

关键词： Gold nanoparticles photocatalysts Dye degradation Antifungal studies Antibacterial studies

Catalyst design and structure control for photocatalytic refineries of cellulosic biomass to fuels and chemicals

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Journal of Energy Chemistry 2024年第7期94卷 102-127页

作者： Lulu Sun Nengchao Luo State Key Laboratory of Catalysis Dalian National Laboratory for Clean EnergyDalian Institute of Chemical PhysicsChinese Academy of SciencesDalian 116023LiaoningChina

Lignocellulosic biomass is the largest renewable hydrocarbon resource on earth.Converting cellulose,one of the major components of lignocellulose,powered by solar energy is a promising way of providing lowcarbon-footprint energy chemicals such as H_(2),HCOOH,CO,and transportation fuels.State-of-the-art biorefineries target the full use of biomass feedstocks as they have a maximum collection radius of 75-100 km,requesting efficient and selective photocatalysts that significantly influence the outcome of photocatalytic biorefineries.Well-performed photocatalysts can harvest a broad solar spectrum and are active in breaking the chemical bonds of cellulose,decreasing the capital investments of biorefineries.Besides,photocatalysts should control the selectivity of cellulose conversion,originating target products to level down separation costs.Charge separation in photocatalysts and interfacial charge transfer between photocatalysts and cellulose affect the activity and selectivity of cellulose refineries to H2 and carbonaceous chemicals.To account for the challenges above,this review summarizes photocatalysts for the refineries of cellulose and downstream platform molecules based on the types of products,with the structure features of different types of photocatalysts discussed in relation to the targets of either improving the activity or product selectivity.In addition,this review also sheds light on the methods for designing and regulating photocatalyst structures to facilitate photocatalytic refineries of cellulose and platform molecules,meanwhile summarizing proposed future research challenges and opportunities for designing efficient photocatalysts.

关键词： photocatalysts Biorefineries Cellulose Fuels Hydrogen

Covalent triazine frameworks modified by ultrafine Pt nanoparticles for efficient photocatalytic hydrogen production

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Nano Research 2024年第6期17卷 4908-4915页

作者： Xu Han Xueying Ge Wen-Wen He Wangwang Shen Tao Zhou Jian-Sen Wang Rong-Lin Zhong Abdullah MAl-Enizi Ayman Nafady Shengqian Ma School of Chemistry and Life Science Advanced Institute of Materials ScienceChangchun University of TechnologyChangchun 130012China Laboratory of Theoretical and Computational Chemistry Institute of Theoretical ChemistryCollege of ChemistryJilin UniversityChangchun 130021China Department of Chemistry University of North Texas1508 W.Mulberry St.DentonTX 76201USA Department of Chemistry College of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia

Pt nanoparticles(PtNPs)as active species have always been considered as one of the best semiconductor materials for photocatalytic hydrogen production.In this study,a Schottky heterojunction has been successfully constructed by evenly loading ultrafine PtNPs onto a triazine-based covalent organic frameworks(COFs).This strategy maintained the high activity of these ultra-small PtNPs while maximizing the utilization of the Pt active sites.The fabricated PtNPs@covalent triazine-based framework-1(CTF-1)composite accomplished a significantly high rate of hydrogen evolution(20.0 mmol·g^(−1)·h^(−1),apparent quantum efficiency(AQE)=7.6%,atλ=450 nm)with 0.40 wt.%Pt loading,giving rise to a 44-fold-increase in the efficiency of the photocatalytic hydrogen production compared to the pristine CTF-1.Theoretical calculations revealed that the strong electron transfer(Q(Pt)=−0.726 qe,in the analysis of Bader charge,Q(Pt)is the charge quantity transferred from Pt cluster to CTF-1,and qe is the unit of charge transfer quantity)between PtNPs and CTF-1 triggers a strong interaction,which makes PtNPs being firmly attached to the structure of CTF-1,thereby enabling high stability and excellent hydrogen production efficiency.Importantly,the hydrogen binding free energy(ΔGH*)of PtNPs@CTF-1 is much lower than that of the unmodified CTF-1,leading to a much lower intermediate state and hence a significant improvement in photocatalytic performance.The overall findings of this work provide a new platform to incorporate metallic NPs into COFs for the design and fabrication of highly efficient photocatalysts.

关键词： Pt nanoparticles covalent triazine-based framework-1(CTF-1) photocatalysts hydrogen evolution reaction

An overview of metal hydroxyfluoride-A novel semiconductor material

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ChemPhysMater

ChemPhysMater 2024年第2期3卷 125-142页

作者： Xingyu Yao Rutao Wang Jinbo Zhao Fei Liu Zhidong Jin Zhou Wang Fenglong Wang Jiurong Liu Lili Wu Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials Ministry of EducationSchool of Materials Science and EngineeringShandong UniversityJinan250061China School of Materials Science and Engineering Qilu University of Technology(Shandong Academy of Sciences)Jinan 250353China

Semiconductors have been widely used in many high-tech fields such as photo-and electro-catalysis,ion bat-teries,and solar cells.In addition to the earliest discovered elemental and compound semiconductors,such as monocrystalline silicon and metal oxides,new types of compound semiconductors have been discovered.Among them,metal hydroxyfluorides(MOHF)are an emerging type of semiconductor that are easy to synthesize and inexpensive.However,many of their properties and applications are not well understood.Nevertheless,some MOHF materials,such as ZnOHF and CoOHF,have been sufficiently developed,and their applications have been extensively explored.This review focuses on a new compound semiconductor,MOHF,with ZnOHF and CoOHF as the typical.After a short introduction to their physical and chemical properties,their common applications are illustrated with several examples.Subsequently,other less-researched MOHF and MOHF-like materials,as well as their applications,are discussed.Moreover,the expectations and development directions of MOHFs are briefly summarized.

关键词： Metal hydroxyfluoride Semiconductor Functionalmaterials photocatalysts Electrochemistry

Recent progress in research and design concepts for the characterization,testing,and photocatalysts for nitrogen reduction reaction

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Carbon Energy 2023年第3期5卷 19-74页

作者： Benteng Sun Shucao Lu Yeye Qian Xiaoli Zhang Jian Tian School of Materials Science and Engineering Shandong University of Science and TechnologyQingdaoChina State Key Laboratory of Crystal Materials Shandong UniversityJinanChina School of Materials Science and Engineering Zhengzhou UniversityZhengzhouChina

The reduction of molecular nitrogen(N_(2))to ammonia(NH_(3))under mild conditions is one of the most promising studies in the energy field due to the important role of NH_(3)in modern industry,production,and life.The photocatalytic reduction of N_(2)is expected to achieve clean and sustainable NH_(3)production by using clean solar energy.To date,the new photocatalysts for photocatalytic reduction of N_(2)to NH_(3)at room temperature and atmospheric pressure have not been fully developed.The major challenge is to achieve high light-absorption efficiency,conversion efficiency,and stability of photocatalysts.Herein,the methods for measuring produced NH_(3)are compared,and the problems related to possible NH_(3)pollution in photocatalytic systems are mentioned to provide accurate ideas for measuring photocatalytic efficiency.The recent progress of nitrogen reduction reaction(NRR)photocatalysts at ambient temperature and pressure is summarized by introducing charge transfer,migration,and separation in photocatalytic NRR,which provides a guidance for the selection of future photocatalyst.More importantly,we introduce the latest research strategies of photocatalysts in detail,which can guide the preparation and design of photocatalysts with high NRR activity.

关键词： nitrogen reduction reaction photocatalysts produced NH 3 measuring methods reaction mechanism research strategy

Towards single-atom photocatalysts for future carbon-neutral application

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SmartMat 2022年第3期3卷 417-446页

作者： Dongpeng Zhang Yanxiao Li Yi Li Sihui Zhan MOE Key Laboratory of Pollution Processes and Environmental Criteria Tianjin Key Laboratory of Environmental Remediation and Pollution ControlCollege of Environmental Science and EngineeringNankai UniversityTianjinChina Department of Chemistry Tianjin UniversityTianjinChina

The implementation of carbon neutrality to achieve the goal of controlling global warming in the Paris Climate Agreement is currently the most important international climate issue.Efficient utilization of solar energy through photocatalysts is of great significance to the adjustment of energy structure.Single-atom photocatalysts have excellent catalytic activity and selectivity in a variety of applications,including sustainable energy conversion,chemical synthesis,CO_(2)reduction,environmental remediation,and other areas,owing to their unique electronic structure and high atom usage.Here,we elaborated on the content and implementation direction of the carbon neutrality policy and demonstrated the design principles of single-atom photocatalysts.Recent single-atom synthesis strategies are summarized,and representative characterization methods have been shown to further reveal the structure–performance relationship.Then,we focus on the application of single-atom photocatalysts in CO_(2)reduction,sustainable energy conversion,and environmental remediation.Finally,the opportunities and challenges in the application of single-atom photocatalysts were discussed based on its current development.

关键词： carbon neutrality CO_(2)reduction hydrogen photocatalysts single-atom catalysts synthesis strategies

Synthesis plasmonic Bi/Bi VO4 photocatalysts with enhanced photocatalytic activity for degradation of tetracycline(TC)

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Chinese Journal of Chemical Engineering 2019年第12期27卷 3053-3059页

作者： Nianjun Kang Dongbo Xu Weidong Shi School of Chemistry and Chemical Engineering Jiangsu UniversityZhenjiang 212013China

In recent years,the excessive use of antibiotics has become a serious problem for human health.BiV04 regarded as one of the most promising visible-light-driven photocatalysts was used to degrade the antibiotics.In this paper,we fabricated Bi/BiV04 plasmonic photocatalysts which enhanced the photocatalytic activity of BiV04 for degradation of tetracycline(TC)antibiotic.The Bi/BiV04 photocatalysts were characterized by X-ray diffraction,X-ray photoelectron spectroscopy,scanning electron microscopy,transmission electron microscopy and high-resolution transmission electron microscopy.In addition,the photocatalytic experiment results show that the 0.04-Bi/BiVO4 sample has the best photocatalytic activity for 2 times than the pure BiV04 photocatalyst.The cycle experiments,after four repetitions of the experiments,showed the sample still maintained a high photocatalytic activity.Finally,the photocatalytic reaction mechanism was also studied by free radical capture experiments and electron paramagnetic resonance spectroscopy.

关键词： Bi/BiVO4 Plasmonic photocatalysts Tetracycline(TC) Visible light

Fabrication of biomaterial/TiO2 composite photocatalysts for the selective removal of trace environmental pollutants

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Chinese Journal of Chemical Engineering 2019年第6期27卷 1416-1428页

作者： Yilin Zhao Yaoqiang Wang Gang Xiao Haijia Su Beijing Key Laboratory of Bioprocess Beijing Advanced Innovation Center for Soft Matter Science and Engineering(BAIC-SM)Beijing University of Chemical Technology

Trace environmental pollutants have become a serious problem with special attention on the hazardous heavy metals, refractory organics, and pathogenic microorganisms. With coupling biosorption and photocatalysis to develop biomaterial/TiO2 composite photocatalysts is a promising method to remove these trace pollutants because of the synergistic effect. Biomaterials provide multiple function groups which can selectively and efficiently enrich trace pollutants onto the surface of the photocatalysts, thus facilitating the following transformation mediated by TiO2 photocatalysis. Biomaterials can also help the dispersion and recovery of TiO2, or even modify the band structure of TiO2. The fabrication of chitosan/TiO2, cellulose/TiO2, as well as other biomaterial/TiO2 composite photocatalysts is discussed in detail in this review. The application significance of these composite photocatalysts for the selective removal of trace pollutants is also addressed. Several problems should be solved before the realistic applications can be achieved as discussed in the final section.

关键词： Biomaterial TiO2 Composite photocatalysts Trace pollutants

Hydrogel photocatalysts for efficient energy conversion and environmental treatment

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Frontiers in Energy 2021年第3期15卷 577-595页

作者： Wenwei LEI Norihiro SUZUKI Chiaki TERASHIMA Akira FUJISHIMA School of Environmental and Chemical Engineering Yanshan UniversityQinhuangdao 066004ChinaPhotocatalysis International Research CenterTokyo University of Science2641 YamazakiNodaChiba 278-8510Japan Photocatalysis International Research Center Tokyo University of Science2641 YamazakiNodaChiba 278-8510Japan

photocatalysts have attracted great research interest owing to their excellent properties and potential for simultaneously addressing challenges related to energy needs and environmental pollution.Photocatalytic particles need to be in contact with their respective media to exhibit efficient photocatalytic performances.However,it is difficult to separate nanometer-sized photocatalytic materials from reaction media later,which may lead to secondary pollution and a poor recycling performance.Hydrogel photocatalysts with a three-dimensional(3D)network structures are promising support materials for photocatalysts based on features such as high specific surface areas and adsorption capacities and good environmental compatibility.In this review,hydrogel photocatalysts are classified into two different categories depending on their elemental composition and recent progresses in the methods for preparing hydrogel photocatalysts are summarized.Moreover,current applications of hydrogel photocatalysts in energy conversion and environmental remediation are reviewed.Furthermore,a comprehensive outlook and highlight future challenges in the development of hydrogel photocatalysts are presented.

关键词： hydrogel photocatalysts energy conversion environmental treatment