Removal of Cr (VI) from aqueous solution by Eichhornia crassipes root biomass-derived activated carbon
Removal of Cr (VI) from aqueous solution by Eichhornia crassipes root biomass-derived activated carbon
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DOI：
10.1016/j.cej.2012.01.025
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发表时间：
2012-03-15
影响因子：
15.1
通讯作者：
Mandal, Sandip
中科院分区：
文献类型：
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作者：
Giri, Anil Kumar;Patel, Rajkishore;Mandal, Sandip
研究了凤眼莲根部生物量制备的活性碳对水溶液中六价铬的去除作用。采用扫描电子显微镜、红外光谱和X射线衍射仪对活性碳进行了制备和表征。吸附与吸附剂用量、溶液的pH值、接触时间有关。并对温度进行了研究，以达到最佳工艺条件。在pH值为4.5、接触时间为30min、生物质投加量为7g/L、温度为25+/-2℃的最佳条件下，活性炭的最大去除能力为36.34 mg/g，根据D-R模型计算出的平均吸附能E反映了吸附的化学吸附性质。拟二级方程描述了铬(VI)的吸附动力学(R-2>；0.99)。热力学参数表明，吸附过程是吸热的，自发的，在本质上是可行的。还进行了柱研究，以了解突破点，初始浓度为10 mg/L。突破时的出水量为100床体积，柱容量为0.8 mg/g。(C)2012 Elsevier B.V.保留所有权利。
In this work, the removal of Cr (VI) from aqueous solutions by activated carbon prepared from the Eichhornia crassipes root biomass has been studied. Activated carbon is prepared and characterized, using SEM-EDX, FTIR and XRD. Dependence of adsorption on adsorbent dose, pH of the solution, contact time. and temperature had been studied to achieve the optimum condition. The maximum removal capacity of activated carbon was found to be 36.34 mg/g, at optimum conditions of pH 4.5, contact time of 30 min, biomass dosage of 7 g/L, and temperature of 25 +/- 2 degrees C. The mean sorption energy (E) is calculated from D-R model which indicate the chemisorptions nature of adsorption. The pseudo-second-order equation described the kinetics of Cr (VI) adsorption (R-2 > 0.99). Thermodynamic parameters reveal that the adsorption process is endothermic, spontaneous, and feasible in nature. Column studies are also performed to know the breakthrough point with an initial concentration of 10 mg/L. The effluent volume at breakthrough is found to be 100 bed volumes, and the column capacity is found to be 0.8 mg/g. (c) 2012 Elsevier B.V. All rights reserved.