Singh Ravi Kant, Kumar Shashi, Kumar Surendra, Kumar Arinjay
Chemical Engineering Department, Indian Institute of Technology Roorkee, Roorkee 247 667, Uttarakhand, India.
J Hazard Mater. 2008 Jul 15;155(3):523-35. doi: 10.1016/j.jhazmat.2007.11.117. Epub 2007 Dec 5.
The activated carbon was prepared from carbonaceous agriculture waste Parthenium hysterophorous by chemical activation using concentrated H2SO4 at 130+/-5 degrees C. The prepared activated carbon was characterized and was found as an effective adsorbent material. In order to test the efficacy of parthenium based activated carbon (PAC), batch experiments were performed to carryout the adsorption studies on PAC for the removal of highly toxic pollutant p-cresol from aqueous solution. The p-cresol adsorption studies were also carried out on commercial grade activated carbon (AC) to facilitate comparison between the adsorption capabilities of PAC and AC. For PAC and AC, the predictive capabilities of two types of kinetic models and six types of adsorption equilibrium isotherm models were examined. The effect of pH of solution, adsorbent dose and initial p-cresol concentration on adsorption behaviour was investigated, as well. The adsorption on PAC and on AC was found to follow pseudo-first order kinetics with rate constant 0.0016 min(-1) and 0.0050 min(-1), respectively. The highest adsorptive capacity of PAC and AC for p-cresol solution was attained at pH 6.0. Further, as an adsorbent PAC was found to be as good as AC for removal of p-cresol upto a concentration of 500 mg/l in aqueous solution. Freundlich, Redlich-Peterson, and Fritz-Schlunder models were found to be appropriate isotherm models for PAC while Toth, Radke-Prausnitz and Fritz-Schlunder were suitable models for AC to remove p-cresol from aqueous solution.
以碳质农业废弃物银胶菊为原料，在130±5℃下用浓硫酸进行化学活化制备活性炭。对制备的活性炭进行了表征，发现其为一种有效的吸附材料。为了测试基于银胶菊的活性炭（PAC）的功效，进行了批次实验，以研究PAC对水溶液中剧毒污染物对甲酚的吸附情况。还对商业级活性炭（AC）进行了对甲酚吸附研究，以便比较PAC和AC的吸附能力。对于PAC和AC，研究了两种动力学模型和六种吸附平衡等温线模型的预测能力。同时考察了溶液pH值、吸附剂剂量和初始对甲酚浓度对吸附行为的影响。发现PAC和AC上的吸附均符合准一级动力学，速率常数分别为0.0016 min⁻¹和0.0050 min⁻¹。PAC和AC对甲酚溶液的最高吸附容量在pH 6.0时达到。此外，作为吸附剂，发现PAC在去除水溶液中浓度高达500 mg/l的对甲酚方面与AC一样好。发现Freundlich、Redlich-Peterson和Fritz-Schlunder模型是适用于PAC的等温线模型，而Toth、Radke-Prausnitz和Fritz-Schlunder是适用于AC从水溶液中去除对甲酚的模型。
