Academic Center for Education, Culture and Research (ACECR), Environmental Research Institute, Siadati Street, Mellat Aveniue, P. O. Box 3114-41635, Rasht, Iran.
Faculty of Chemistry, University of Guilan, Namjoo Street, P.O. Box 1914, Rasht, Iran.
Environ Sci Pollut Res Int. 2019 Jul;26(20):20344-20351. doi: 10.1007/s11356-019-05396-4. Epub 2019 May 16.
In the present study, NHCl-modified activated carbon was synthesized from rice husk and used as an adsorbent for removal of hinosan from underground waters. The effect of some effective parameters on the adsorption of hinosan on the rice husk NHCl-modified activated carbon (RHNAC) like pH, adsorbent dose, contact time, and temperature was evaluated in batch mode and the optimum conditions were determined. Kinetic of adsorption was studied by Langmuir and Freundlich's models. The equilibrium data were well fitted to the Langmuir isotherm model, and the maximum adsorption capacity of hinosan on RHNAC based on the Langmuir isotherm model was 81.366 mg g. The experimental adsorption data had the best fitness with the pseudo-second-order kinetic model. The applicability of the prepared adsorbent (RHNAC) was compared with other activated carbons (ZnCl-modified activated carbon was prepared from rice husk and industrial activated carbon). The obtained results which were calculated from the selected adsorbents showed more desirability for RHNAC as an adsorbent. So, RHNAC could be introduced as an effective and cost-effective adsorbent for removal of hinosan from underground waters. Graphical abstract.
在本研究中，从稻壳中合成了氯化铵改性活性炭，并将其用作吸附剂，用于去除地下水中的比诺沙星。采用批量模式评价了一些有效参数（如 pH 值、吸附剂用量、接触时间和温度）对稻壳氯化铵改性活性炭（RHNAC）吸附比诺沙星的影响，并确定了最佳条件。通过 Langmuir 和 Freundlich 模型研究了吸附动力学。吸附平衡数据很好地符合 Langmuir 等温线模型，根据 Langmuir 等温线模型，RHNAC 对比诺沙星的最大吸附容量为 81.366mg/g。实验吸附数据与拟二级动力学模型拟合度最好。将制备的吸附剂（RHNAC）与其他活性炭（ZnCl 改性活性炭由稻壳和工业活性炭制备）进行了比较。从所选吸附剂计算出的结果表明，RHNAC 作为吸附剂更具吸引力。因此，RHNAC 可作为一种有效且经济有效的吸附剂，用于去除地下水中的比诺沙星。
