Preparation of activated carbon from a renewable bio-plant of Euphorbia rigida by H2SO4 activation and its adsorption behavior in aqueous solutions
Preparation of activated carbon from a renewable bio-plant of Euphorbia rigida by H2SO4 activation and its adsorption behavior in aqueous solutions
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DOI：
10.1016/j.apsusc.2006.10.053
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发表时间：
2007-03-30
影响因子：
6.7
通讯作者：
Gercel, H. Ferdi
中科院分区：
文献类型：
--
作者：
Gercel, Ozgul;Ozcan, Adnan;Gercel, H. Ferdi
研究了在不同接触时间、pH值和温度下，从硬大戟中获得的活性炭对碱性纺织品染料亚甲基蓝的去除效果。用H2SO 4对植物材料进行化学改性。化学改性的活性炭的表面积为741.2 m（2）g（-1）。采用FTIR光谱技术对植物炭和活性炭进行了表面表征。吸附过程在60 min内达到平衡，吸附等温线符合Langmuir平衡等温方程，40 ℃时活性炭的吸附容量为114.45 mg g（-1）。亚甲基蓝的吸附动力学服从准二级动力学模型，并遵循颗粒内扩散模型长达60 min。计算的热力学参数，如Δ G度，Δ H度和Δ S度估计吸附的性质。计算出该体系的活化能为55.51kJ mol（-1）。根据这些结果，制备的活性炭可以作为一种低成本的吸附剂，用于去除纺织废水中的纺织染料工艺与商业活性炭相比。(c)2006 Elsevier B. V.保留所有权利。
The use of activated carbon obtained from Euphorbia rigida for the removal of a basic textile dye, which is methylene blue, from aqueous solutions at various contact times, pHs and temperatures was investigated. The plant material was chemically modified with H2SO4. The surface area of chemically modified activated carbon was 741.2 m(2) g(-1). The surface characterization of both plant-and activated carbon was undertaken using FTIR spectroscopic technique. The adsorption process attains equilibrium within 60 min. The experimental data indicated that the adsorption isotherms are well described by the Langmuir equilibrium isotherm equation and the calculated adsorption capacity of activated carbon was 114.45 mg g(-1) at 40 degrees C. The adsorption kinetics of methylene blue obeys the pseudo- second-order kinetic model and also followed by the intraparticle diffusion model up to 60 min. The thermodynamic parameters such as Delta G degrees, Delta H degrees and Delta S degrees were calculated to estimate the nature of adsorption. The activation energy of the system was calculated as 55.5 1 kJ mol(-1). According to these results, prepared activated carbon could be used as a low-cost adsorbent to compare with the commercial activated carbon for the removal textile dyes from textile wastewater processes. (c) 2006 Elsevier B.V. All rights reserved.