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Adsorption Kinetics of 2,2′,4,4′-Tetrabromodiphenyl Ether(BDE-47) on Maize Straw-Derived Biochars

Pedosphere 2019年第6期29卷 721-729页

作者： LIU Guangxia SONG Yang SHENG Hongjie YE Mao Robert DSTEDTFELD BIAN Yongrong GU Chenggang JIANG Xin WANG Fang Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil ScienceChinese Academy of SciencesNanjing 210008(China University of Chinese Academy of Sciences Beijing 100049(China Department of Civil and Environmental Engineering Michigan State UniversityLansing MI48824(USA

The chars in the natural environment can affect the migration of polybrominated diphenyl ethers(PBDEs). However, there is insufficient research relating to the adsorption behavior and mechanisms of PBDEs on biochars. This study examined the adsorption kinetics of 2,2′,4,4′-tetrabromodiphenyl ether(BDE-47) on maize straw-derived biochars(MSBCs) pyrolyzed at four different temperatures via batch experiments. The biochar samples were characterized using Fourier transform infrared(FTIR) spectroscopy,Raman spectra, and elemental analysis. A two-compartment first-order model and pseudo-second-order model exhibited a better fit compared to a pseudo-first-order model in describing the BDE-47 adsorption on biochars, which was dominated by a slow adsorption compartment and chemisorption. The MSBC pyrolyzed at 600 °C had the highest BDE-47 adsorption capacity owing to its relatively large specific surface area and relatively high aromaticity compared with the other three MSBCs pyrolyzed at 300, 400, and 500 ℃.However, there was no significant difference in adsorption capacity among the other three biochars. The organic functional groups coupled with the graphene structures of biochars and the hydrophobic effect of the functional groups promoted the adsorption of BDE-47. pore diffusion was not the sole rate-limiting step;film diffusion was also involved in the adsorption process of BDE-47 on biochars. The overall results demonstrate the transport and potential treatment of PBDEs using biochars.

关键词： Adsorption capacity Film diffusion Graphene structure Organic functional group Organic pollutant Polybrominated diphenyl ethers pore diffusion Pyrolysis temperature

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Preparation and performance evaluation of resin-derived carbon spheres for desulfurization of fuels

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Science China Chemistry 2013年第3期56卷 393-398页

作者： LAN Pei ZHANG ShuJuan PAN BingCai LV Lu ZHANG WeiMing State Key Laboratory of Pollution Control and Resource Reuse School of the Environment Nanjing University

A polystyrene-based ion-exchange resin was employed as the precursor for preparation of resin-derived carbon spheres(RCSs) through KOH activation with various impregnation *** structure,yield and hardness,surface functional groups of the samples and their adsorption performance towards dibenzothiophene(DBT) were *** RCSs with large surface areas(up to 2696m2/g) and total pore volumes(up to 1.46 cm3/g) exhibited larger adsorption capacities than a commercial activated carbon,***-Dubinin-Mane(PDM) model was applied to fit the adsorption data,which proved that micropore filling was involved during the adsorption ***,a good linear relationship was observed between the extra-micropore volume and adsorption ***-particle diffusion(IPD) model was used to describe the kinetic data of DBT onto the *** adsorption processes were divided into three stages according to the different diffusion *** selective adsorption towards DBT in the presence of competing compounds was also investigated and the high selectivity of the RSCs towards DBT may be attributed to the large quantity of acidic oxygen-containing groups.

关键词： KOH activation carbon spheres dibenzothiophene adsorption isotherm pore diffusion

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