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Synthesis of hierarchical porous carbon with high surface area by chemical activation of(NH_(4))_(2)C_(2)O_(4) modified hydrochar for chlorobenzene adsorption

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Journal of Environmental Sciences 2023年第4期126卷 123-137页

作者： Jie Wen Zewei Liu hongxia xi Bichun Huang School of Environment and Energy South China University of TechnologyGuangzhou Higher Education Mega CentreGuangzhou 510006China School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou 510640China The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters Ministry of EducationSouth China University of TechnologyGuangzhou Higher Education Mega CentreGuangzhou 510006China

In this work,hydrothermal technique combined with KOH activation were employed to develop a series of porous carbons (NPCK-x) using tobacco stem as a low-cost carbon source and (NH_(4))_(2)C_(2)O_(4)as a novel nitrogen-doping *** properties of NPCK-x were characterized by Brunauer-Emmett-Teller,field emission scanning electron microscopy,X-ray diffraction,Raman microscope,elemental analysis,and X-ray photoelectron *** showed that the NPCK-x samples possessed large surface areas (maximum:2875 m^(2)/g),hierarchical porous structures,and high degree of disorder.N-containing functional groups decomposed during activation process,which could be the dominant reason for appearance of abundant mesopores and well-developed pore *** chlorobenzene adsorption experiments demonstrated that carbon materials with(NH_(4))_(2)C_(2)O_(4)modification exhibited higher adsorption capacity (maximum:1053 mg/g) than those without modification (maximum:723 mg/g).The reusability studies of chlorobenzene indicated that the desorption efficiency of (NH_(4))_(2)C_(2)O_(4)modified porous carbon reached90.40%after thermal desorption at 100℃ under *** model fitting results exhibited that the existence of mesopores accelerated the diffusion rate of chlorobenzene in porous ***,Grand Canonical Monte Carlo simulation was conducted to verify that micropores with pore sizes of 1.2–2 nm of the optimized porous carbon were the best adsorption sites for chlorobenzene and mesopores with pore sizes of 2–5 nm were also highly active sites for chlorobenzene adsorption.

关键词： Tobacco stem Hierarchical porous carbon N-containing groups Dynamic adsorption Chlorobenzene

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Recent advancements in metal-organic frameworks for green applications

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Green Energy & Environment 2021年第1期6卷 33-49页

作者： Chongxiong Duan Yi Yu Jing xiao Yuanyuan Li Pengfei Yang Fei Hu hongxia xi School of Materials Science and Hydrogen Engineering Foshan UniversityFoshan528231China School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou510640China School of Chemistry and Chemical Engineering University of South Chin1Hunan421001China

A series of environmental and energy issues,such as global warming,water pollution,acid rain,and energy shortage,have to be settled ***-organic frameworks(MOFs)are compounds consisting of metal ions or clusters coordinated to organic ligands,which show great promise for alleviating or mitigating these challenges owing to their outstanding physical and chemical *** this review,we summarize the recent advances of MOFs in the fields of green applications,including carbon capture,harmful gas removal,sewage treatment,and green energy *** addition,the challenges and prospects of the large-scale commercialized use of MOFs in handling environmental issues are also discussed.

关键词： Metal-organic frameworks Environmental and energy issues Industrial production Green applications

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Water-based synthesis of nanoscale hierarchical metal-organic frameworks:Boosting adsorption and catalytic performance

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Nano Materials Science 2023年第4期5卷 361-368页

作者： Yi Yu Zewei Liu xiaofei Chen Shujun Liu Chongxiong Duan hongxia xi School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou510640PR China School of Materials Science and Hydrogen Engineering Foshan UniversityFoshan528231PR China Guangdong Provincial Key Laboratory of Atmospheric Environment and Pollution Control South China University of TechnologyGuangzhou Higher Education Mega CentreGuangzhou510006PR China

The combination of nano sizes,large pore sizes and green synthesis is recognized as one of the most crucial and challenging problems in constructing metal-organic frameworks(MOFs).Herein,a water-based strategy is proposed for the synthesis of nanoscale hierarchical MOFs(NH-MOFs)with high crystallinity and excellent *** approach allows the morphology and porosity of MOFs to be fine tuned,thereby enabling the nanoscale crystal generation and a well-defined hierarchical *** aqueous solution facilitates rapid nucleation kinetics,and the introduced modulator acts as a deprotonation agent to accelerate the deprotonation of the organic ligand as well as a structure-directing agent(SDA)to guide the formation of hierarchical *** assynthesized NH-MOFs(NH-ZIF-67)were assessed as efficient adsorbents and heterogeneous catalysts to facilitate the diffusion of guest molecules,outperforming the parent *** study focuses on understanding the NH-MOF growth rules,which could allow tailor-designing NH-MOFs for various functions.

关键词： Nanoscale hierarchical metal-organic framework Water-based synthesis Volatile organic compounds Olefins oxidation

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Effect of textural property of coconut shell-based activated carbon on desorption activation energy of benzothiophene

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Frontiers of Chemical Science and Engineering 2008年第3期2卷 269-275页

作者： Moxin YU Zhong LI hongxia xi Qibin xiA Shuwen WANG College of Chemical and Energy Engineering South China University of TechnologyThe Key Laboratory of Enhanced Heat Transfer and Energy ConversationMinistry of EducationGuangzhou 510640China

In this work,the effect of the textural property of activated carbons on desorption activation energy and adsorption capacity for benzothiophene(BT)was *** surface areas and the textural parameters of three kinds of the activated carbons,namely SY-6,SY-13 and SY-19,were measured with an ASAP 2010 *** desorption activation energies of BT on the activated carbons were determined by temperature-programmed desorption(TPD).Static adsorption experiments were carried out to determine the isotherms of BT on the activated *** influence of the textural property of the activated carbons on desorption activation energy and the adsorption capacity for BT was *** showed that the BET surface areas of the activated carbons,SY-6,SY-13 and SY-19 were 1106,1070 and 689 m2·g^(-1),respectively,and their average pore diameters were 1.96,2.58 and 2.16 nm,*** TPD results indicated that the desorption activation energy of BT on the activated carbons,SY-6,SY-19 and SY-13 were 58.84,53.02 and 42.57 KJ/mol,*** isotherms showed that the amount of BT adsorbed on the activated carbons followed the order of SY-6>SY-19>*** smaller the average pore diameter of the activated carbon,the stronger its adsorption for BT and the higher the activation energy required for BT desorption on its *** Freundlich adsorption isotherm model can be properly used to formulate the adsorption behavior of BT on the activated carbons.

关键词： activated carbon benzothiophene desorption activation energy average pore diameter adsorption equilibrium

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A NEW MODIFIED LINEAR DRIVING FORCE(MLDF)MODEL

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Chinese Journal of Reactive Polymers 1999年第1期8卷 53-60页

作者： xiELiansong LIZhong xi hongxia Research Institute of Chemical Engineering South China University of Technology Guangzhou 510640P.R.CHINA

Linear driving force (LDF) model is widely used in a diffusion process. However thismodel has inherent weakness. When the dimensionless time is less than 0.1, its relativeerror is up to 95%. In this paper a new concentration profile is proposed, and then a newmodified LDF model (MLDF) is deduced. Compared with the exact solution ofintraparticle diffusion equation, the transient volume-average amount adsorbedcalculated from the MLDF is more accurate than that calculaled from the LDF modeL .Ifone takes ±10% relative error for the limit of validity of approximation, the new model isvalid when the dimensionless time is just larger than 0. 0002, while the LDF model is notvalid until the dimension time is large than 0.05. The new model is superior to the LDFmodel. The new concentration profiles corresponding to the MLDF model are much closeto the exact concentration profiles within a particle than the parabolic propescorresponding to the LDF model.

关键词： Adsorption Diffusion Linear driving force (LDF). Concentration profile

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Highly selective separation of propylene/propane mixture on cost-effectively four-carbon linkers based metal-organic frameworks

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Chinese Journal of Chemical Engineering 2022年第11期51卷 126-134页

作者： Daofei Lv Junhao Xu Pingjun Zhou Shi Tu Feng Xu Jian Yan hongxia xi Zewei Liu Wenbing Yuan Qiang Fu xin Chen Qibin xia School of Environmental and Chemical Engineering Foshan UniversityFoshan 528000China School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou 510641China Sichuan Jinyuansheng New Energy Technology Co. LtdMeishan 620010China

The separation of propylene and propane is an important but challenging process,primarily achieved through energy-intensive distillation technology in the petrochemical ***,we reported two natural C4linkers based metal–organic frameworks(MIP-202 and MIP-203)for C_(3)H_(6)/C_(3)H_(8)*** isotherms and selectivity calculations were performed to study the adsorption performance for C_(3)H_(6)/C_(3)H_(8)*** show that C_(3)H_(6)/C_(3)H_(8)uptake ratios(298 K,100 kPa)for MIP-202 and MIP-203 are 2.34 and 7.4,respectively.C_(3)H_(6)/C_(3)H_(8)uptake ratio(303 K,100 k Pa)for MIP-203 is up *** mechanism for enhanced separation performance of C_(3)H_(6)/C_(3)H_(8)on MIP-203 at higher temperature(303 K)was revealed by the in situ PXRD *** adsorption selectivities of C_(3)H_(6)/C_(3)H_(8)on MIP-202 and MIP-203(298 K,100 k Pa)are 8.8 and 551.4,*** mechanism for the preferential adsorption of C_(3)H_(6)over C_(3)H_(8)in MIP-202 and MIP-203 was revealed by the Monte Carlo *** cost of organic ligands for MIP-202 and MIP-203 was lower than that of organic ligands for those top-performance *** work sets a new benchmark for C_(3)H_(6)sorbents with high adsorption selectivities.

关键词： Propylene Propane Separation Gas Adsorption Metal-organic frameworks

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Defect-induced synthesis of nanoscale hierarchically porous metal-organic frameworks with tunable porosity for enhanced volatile organic compound adsorption

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Nano Materials Science 2024年第4期6卷 467-474页

作者： Kuan Liang Weibiao Guo Linmei Li Huidong Cai Haiqi Zhang Jingjing Li Feng Xu Jian Yan Daofei Lv hongxia xi Chongxiong Duan Guangdong Provincial Key Laboratory of Intelligent Food Manufacturing Foshan UniversityFoshan528231China School of Materials Science and Hydrogen Engineering Foshan UniversityFoshan528231China School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou510640China School of Environmental and Chemical Engineering Foshan UniversityFoshan528231China

Nanoscale hierarchically porous metal-organic frameworks(NH-MOFs)synergistically combine the advantages of nanoscale MOFs and hierarchically porous MOFs,resulting in remarkable characteristics such as increased specific surface area,greater porosity,and enhanced exposure of active ***,nanoscale hierarchically porous UIO-66(UIO-66_X)was synthesized using a defect-induced strategy that employed ethylene diamine tetraacetic acid(EDTA)as a *** introduced EDTA occupies the coordination sites of organic ligands,promoting the formation and growth of UIO-66 crystal nuclei and inducing defects during *** as-synthesized UIO-66_X crystals exhibit a uniform distribution with an average size of approximately 100 *** addition,the total pore volume attains a remarkable value of 0.95 cm^(3)g^(-1),with mesopores constituting 36.8% of the ***,the porosities of UIO-66_X can be easily tuned by controlling the molar ratio of EDTA/Zr^(4+).In addition,the as-synthesized UIO-66_X exhibits excellent adsorption capacities for n-hexane(344 mg g^(-1))and pxylene(218 mg g^(-1)),which are 44.5% and 27.5% higher than those of conventional UIO-66,***,the adsorption behavior of n-hexane and p-xylene molecules in UIO-66_X was investigated using density functional theory simulations.

关键词： Nanoscale hierarchically porous MOFs Tunable porosities Enhanced VOC adsorption

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Recent advances in the synthesis of nanoscale hierarchically porous metal–organic frameworks

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Nano Materials Science 2022年第4期4卷 351-365页

作者： Chongxiong Duan Kuan Liang Zena Zhang Jingjing Li Ting Chen Daofei Lv Libo Li Le Kang Kai Wang Han Hu hongxia xi School of Materials Science and Hydrogen Engineering Foshan UniversityFoshan528231China School of Chemistry and Chemical Engineering South China University of TechnologyGuangzhou510640China State Key Laboratory of Heavy Oil Processing College of Chemical EngineeringInstitute of New EnergyChina University of Petroleum(East China)Qingdao266580China School of Materials Science and Engineering Xi'an University of Science and TechnologyXi'an710054China School of Electrical Engineering Qingdao UniversityQingdao266061China

Nanoscale hierarchically porous metal–organic frameworks(NHP-MOFs)have received unprecedented attention in many fields owing to their integration of the strengths of nanoscale size(<1μm)and hierarchical porous structure(micro-,meso-and/or macro-pores)of *** review focuses on recent advances in the main synthetic strategies for NHP-MOFs based on different metal ions(e.g.,Cu,Fe,Co,Zn,Al,Zr,and Cr),including the template method,composite technology,post-synthetic modification,in situ growth and the grind *** addition,the mechanisms of synthesis,regulation techniques and the advantages and disadvantages of various methods are ***,the challenges and prospects of the commercialisation of promising NHP-MOFs are also *** purpose of this review is to provide a road map for future design and development of NHP-MOFs for practical application.

关键词： Metal–organic frameworks Nanoscale Hierarchically porous structure Synthesis strategies

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PREPARATION OF CUOγ-Al_2O_3 CATALYSTS FOR CATALYTIC COMBUSTION VOCS VIA PLASMA

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Chinese Journal of Reactive Polymers 2005年第1期14卷 14-21页

作者： GUO Jianguang LI Zhong xi hongxia xiA Qibin Research Institute of Chemical Engineering South China University of Technology Guangzhou 510640 China

CuOγ-Al2O3 catalysts were prepared by plasma treatment and conventional impregnation methods. The catalytic combustion of two kinds of volatile organic compounds (VOCs), toluene and benzene, were carried out over these CuOγ-Al2O3 catalysts. The surface properties of these catalysts were characterized by X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). The experimental results showed that in catalytic combustion the activity of the CuOγ-Al2O3 catalyst prepared via plasma was much higher than that of the CuOγ-Al2O3 catalyst prepared by conventional impregnation method. XRD results showed that an enhanced dispersion had been achieved with the plasma treatment. SEM results indicated that the size became much smaller and the surface became more uniform with the plasma treatment.

关键词： Plasma Catalyst Catalytic combustion Volatile organic compounds.

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SYNTHESIS AND CHARACTERIZATION OF NOVEL SOL-GEL DOPED ORGANIC/INORGANIC HYBRID NONLINEAR OPTICAL MATERIALS

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Chinese Journal of Reactive Polymers 2003年第1期12卷 1-9页

作者： xi hongxia LIU Guanxin WANG Huan LI Zhong College of Chemical Engineering South China University of Technology Guangzhou 510640 China

hydroxy-4-nitro azobenzene (NHA) and 4-amino-4-nitro azobenzene (DO3) were prepared respectively from p-nitrophenylamine as a precursor compound. Two kinds of doped organic/inorganic hybrid nonlinear optical (NLO) materials containing NHA and DO3 were synthesized by Sol-Gel process. The preparation and properties of two NLO materials were studied and characterized by FTIR, 1H-NMR, UV-VIS, SEM, DSC and SHG measurements. The results show that the maximum doping amounts of NHA and DO3 in two doped hybrid NLO materials are 7.2(wt)% and 11.3(wt)% respectively, and the corresponding second-order NLO coefficients (d33 values) are 2.91×10 8esu and 6.14×10 8esu. Two doped NLO materials have relatively good RT stability, after 90 days at RT the d33 values can maintain about 85% of their initial values, but after 10h at 100℃ can only maintain about 50% of their initial values. In this report, the reasons for high-temperature instability of doped materials were discussed, and the possible improvements were also suggested.

关键词： Sol-Gel technology Doping Organic/inorganic hybrid nonlinear optical materials Second-order NLO coefficients

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