Adsorption of phenol from aqueous solutions using activated carbons prepared from Tectona grandis sawdust by ZnCl2 activation
Adsorption of phenol from aqueous solutions using activated carbons prepared from Tectona grandis sawdust by ZnCl2 activation
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DOI：
10.1016/j.cej.2005.09.016
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发表时间：
2005-12-15
影响因子：
15.1
通讯作者：
Biswas, MN
中科院分区：
文献类型：
--
作者：
Mohanty, K;Das, D;Biswas, MN
由柚木锯末（一种木材工业废料）制备的活性炭已被检验用于去除水溶液中的苯酚。在四种不同的活化气氛下通过氯化锌活化制备活性炭，以形成具有发达孔隙率的碳。以不同的化学比例（活化剂/前体）进行实验。炭化温度和时间是重要的变量，对炭的孔结构有显着影响。通过 SEM 分析对开发的活性炭进行了表征。孔体积和表面积通过Hg孔隙率测定法和BET表面积分析来估计。碳的表面积和微孔体积分别约为 585 m(2)/g 和 0.442 cm(3)/g。开发的活性炭显示出从水溶液中吸附苯酚的强大能力。动力学数据符合Lagergren、准二级和颗粒内扩散模型，并严格遵循准二级化学吸附模型。 Freundlich 和 Langmuir 等温线模型拟合良好。溶液的pH值显着影响吸附过程。 pH 3.5 时苯酚的最大吸收量为 2.82 mg/g。 (c) 2005 Elsevier B.V. 保留所有权利。
Activated carbons prepared from Tectona grandis sawdust, a timber industry waste, have been examined for the removal of phenol from aqueous solutions. The activated carbon was prepared by zinc chloride activation under four different activation atmospheres, to develop carbons with well-developed porosity. Experiments were carried out at different chemical ratios (activating agent/precursor). Effects of carbonization temperature and time are the important variables, which had significant effect on the pore structure of carbon. Developed activated carbon was characterized by SEM analysis. Pore volume and surface area were estimated by Hg porosimetry and BET surface area analyses. The carbons showed surface area and micropore volumes of around 585 m(2)/g and 0.442 cm(3)/g, respectively. The activated carbon developed showed substantial capability to adsorb phenol from aqueous solutions. The kinetic data were fitted to the models of Lagergren, pseudo-second-order and intraparticle diffusion, and followed closely the pseudo-second-order chemisorption model. The Freundlich and Langmuir isotherm models were well fitted. The solution pH markedly affected the sorption process. The maximum uptake of phenol was found to be 2.82 mg/g at pH 3.5. (c) 2005 Elsevier B.V. All rights reserved.