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Preparation of Waste Coffee-grounds Carbon and Study on Phenol adsorption ability

Journal of Wuhan University of Technology(Materials Science) 2022年第1期37卷 38-46页

作者：李惠娟 ZHANG Jinyuan LI Fengchuan LUO Shimao LI Qian 周世萍 Key Laboratory of State Forestry and Grassland Administration on Highly-Efficient Utilization of Forestry Biomass Resources in Southwest China(Southwest Forestry University) Kunming 650224China

The waste coffee-grounds carbon(WCGC)was prepared with H_(3)PO_(4)treated using waste coffee-grounds as precursor.Its adsorption ability was studied using phenol as test molecule.The influence of H_(3)PO_(4)treated,calcined temperature,the initial phenol concentration,the doge of carbon and original pH values on phenol adsorption ability were investigated.Characterization of WCGC was performed by N_(2)adsorption isotherms,Fourier transform infrared spectroscopy(FT-IR),scanning electron microscopy(SEM),and X-ray diffraction(XRD)techniques.First,the second order and Weber-Morris model reaction rate models were used to estimate the WCGC adsorption ability.The results show that the produced WCGC(700℃,2 h)has been graphitized and the layered structure increased BET surface to 435.98 m^(2)/g and adsorption phenol ability.The initial phenol concentration is 50 mg/L,the amount of WCGC(700℃,2 h)is 0.2 g,and the phenol adsorption rate is 97%after 270 min and no intermediate product formation.The adsorption kinetics of the selected WCGC is best fitted by the Weber-Morris model.

关键词： waste coffee-grounds carbon phenol adsorption ability adsorption kinetics and thermodynamics

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High-valance molybdenum doped Co_(3)O_(4) nanowires:Origin of the superior activity for 5-hydroxymethyl-furfural oxidation

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Chinese Chemical Letters 2023年第7期34卷 384-389页

作者： Bingying Xia Guangjin Wang Shasha Cui Jinyu Guo Hong Xu Zhijuan Liu Shuang-Quan Zang Henan Key Laboratory of Crystalline Molecular Functional Materials Henan International Joint Laboratory of Tumor Theranostical Cluster MaterialsGreen Catalysis Centerand College of ChemistryZhengzhouUniversityZhengzhou 450001China School of Materials Science and Energy Engineering Foshan UniversityFoshan 528000China

Co_(3)O_(4) has been widely explored in electrocatalytic 5-hydroxymethyl-furfural(HMF) oxidation. However,the poor intrinsic ability has seriously limited its electrochemical ability. Heteroatom-doping is an efficient method to enhance the electrocatalytic ability of catalyst by regulating electronic structure. Herein,we have modulated the electronic structure of Co_(3)O_(4) by high valance Mo^(6+)-doping. With the introduction of Mo^(6+), the content of Co^(2+) was increased and metal-oxygen bond was strength. Electrochemical results suggested that the electrocatalytic ability of Co_(3)O_(4) towards HMF oxidation has been dramatically improved and reaction kinetics has been fasten. Theoretical calculations demonstrated that the surrounding cobalt sites after Mo^(6+)-doping with assembled electron has a strong adsorption ability towards HMF molecule leading to more favourable oxidation of HMF. Post characterizations demonstrated pristine Co_(3)O_(4) structure was kept after electrolysis cycles and CoOOH active species were formed. This work provides a valuable reference for developing efficient heteroatom-doped electrocatalysts for HMF oxidation.

关键词： Spinel Co_(3)O_(4) High-valance Mo^(6+)-doping Electronic structure adsorption ability 5-Hydroxymethyl-furfural oxidation

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Titanate Nanorods Modified with Nanocrystalline ZnS Particles and Their Photocatalytic Activity on Pollutant Removal

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Journal of Materials Science & Technology 2016年第11期32卷 1122-1128页

作者： G.Naudin T.Entradas B.Barrocas O.C.Monteiro Faculte de Chimie Universite Pierre et Marie Curie (UPMC) Batiment F 3e etage 4 placeJussieu 75005 Paris France Centro de Quimica e Bioquimica Faculdade de Ciencias Universidade de Lisboa 1749-016 Lisboa Portugal

Aiming to produce materials with enhanced photocatalytic properties, the synthesis of new crystalline nanocomposites by combining titanate nanorods（TNR） with ZnS nanocrystallites is described in this work.The TNR modification was accomplished by an in situ nucleation and growth process of ZnS nanoparticles.Zinc diethyldithiocarbamate was used as the metal chalcogenide precursor. The prepared materials were structural, morphological and optical characterized by X-ray diffraction, transmission electron microscopy and high resolution transmission electron microscopy, energy dispersive spectroscopy and powder diffuse reflectance spectra. Crystalline Zn S nanoparticles were obtained as a homogeneous and continuous layer, covering completely the TNR surface. The application of these new nanocomposite materials on photocatalytic degradation of pollutants was investigated. First, the evaluation of hydroxyl radical formation, using the terephthalic acid as probe, was studied. Afterwards, the adsorption and photodegradation of safranine-T, used here as a model pollutant molecule, was investigated. The obtained data indicate that the prepared nanocomposites have potential to be used as photocatalysts for organic pollutant removal.The best removal results（97% removal） were obtained using the 0.01 Zn S/HTNR sample as catalyst（0.2 g/L; 10 ppm safranin-T solution） with a combination of a low dye adsorption（20%） and a high dye photocatalytic degradation（77%）.

关键词： Nanocomposite materials Surface modification Photocatalysis adsorption ability Optical properties

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Unexpected adsorption Capacity of Ca-deficient Hydroxyapatite in Oil/water System

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Chinese Journal of Chemistry 2011年第3期29卷 595-598页

作者： Le, Yingyi Yin, Anyuan Dai, Weilin Fan, Kangnian Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Fudan University Shanghai 200433 China

Herein, for the first time, we report the unexpected and interesting adsorption capacity of hydroxyapatites to a variety of organics in the presence of water, whose sorption amount could be up to 6 g·g^-1.

关键词： hydroxyapatites adsorption ability oil/water colloids

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