Yakout Sobhy M
Biochemistry Department, College of Science, King Saud University, P.O. Box, 2455, Riyadh, 11451 Kingdom of Saudi Arabia ; Hot Laboratories Centre, Atomic Energy Authority, Cairo, 13759 Egypt.
Chem Cent J. 2014 Sep 3;8(1):52. doi: 10.1186/s13065-014-0052-5. eCollection 2014.
Benzene is one of the most hazardous organic pollutants in groundwater. The removal of benzene from water is very important from a health point of view and for environmental protection. In this study, benzene adsorption kinetics was investigated using phosphoric acid activated carbon, prepared from rice husk.
An initial rapid uptake of benzene was observed and became almost constant after 40 minutes of contact. Kinetic data was analyzed using pseudo first order, pseudo second order, and Elovich equations. Kinetic data was well fitted to pseudo-second order models (R(2) = 0.98), indicating chemisorption. Results from intraparticle diffusion and Boyed models indicate that particle diffusion is the most probable operating mechanism and does not control the kinetics of benzene sorption. A comparative study on the benzene adsorption revealed that the rice husk carbon (RHC) had better benzene adsorption capacity (365 mg/g) as compared to other adsorbents.
In conclusion, we have demonstrated that rice husk carbons are efficient benzene adsorbents and that they possess a good potential for benzene removal in wastewater treatment. Graphical AbstractPhosphoric acid activated carbon from rice husk and benzene adsorption mechanism.
苯是地下水中危害最大的有机污染物之一。从健康角度和环境保护来看，从水中去除苯非常重要。在本研究中，使用由稻壳制备的磷酸活性炭研究了苯的吸附动力学。
观察到苯最初快速吸附，接触40分钟后几乎达到恒定。使用伪一级、伪二级和埃洛维奇方程对动力学数据进行了分析。动力学数据很好地拟合了伪二级模型（R(2) = 0.98），表明为化学吸附。颗粒内扩散和博伊德模型的结果表明，颗粒扩散是最可能的运行机制，且不控制苯吸附的动力学。对苯吸附的比较研究表明，与其他吸附剂相比，稻壳炭（RHC）具有更好的苯吸附容量（365 mg/g）。
总之，我们已经证明稻壳炭是高效的苯吸附剂，并且在废水处理中具有良好的去除苯的潜力。图形摘要稻壳磷酸活性炭与苯吸附机制。
