微波辅助细菌纤维素酯的制备及对Pb(II)的高效去除
微波辅助细菌纤维素酯的制备及对Pb(II)的高效去除
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DOI：
10.3866/pku.whxb201512294
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发表时间：
2016-03
影响因子：
10.9
通讯作者：
王吟;孙凤玲;张晓东;陶红;杨一琼
中科院分区：
文献类型：
--
作者：
王吟;孙凤玲;张晓东;陶红;杨一琼
Two modified bacterial celluloses, xanthate-modified bacterial cellulose (XMBC) and sulfate-modified bacterial cellulose (SMBC), were prepared from bacterial cellulose (BC) esterified with xanthate and sulfate, respectively, using microwave irradiation. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy-energy-dispersive spectroscopy (SEM-EDS), Fourier transform infrared (FT-IR) spectroscopy, and Brunauer-Emmett-Teller (BET) surface analysis. Batch experiments were carried out to determine the ability of XMBC and SMBC to remove Pb(II) from solution. The effects of pH, contact time, temperature, initial adsorption concentration, and ionic strength on Pb(II) removal were investigated along with regeneration performance. Both the specific surface area and total pore volume of the modified biosorbents were higher than those of unmodified bacterial cellulose. The adsorption of Pb(II) decreased with increasing temperature and ionic strength, and the optimal pH was 5.0. The introduction of thiol groups on bacterial cellulose increased its adsorption capacity for Pb(II); the modified biosorbents exhibited adsorption capacities of 144.93 mg∙g-1 for XMBC and 126.58 mg∙g-1 for SMBC. The adsorption rate closely followed a pseudo-second order model and the adsorption isotherm data were consistent with the Langmuir model. The adsorption of Pb(II) was 753 Acta Phys. -Chim. Sin. 2016 Vol.32
