Nguyen Lan Huong, Vu Thi Mai, Le Thi Trinh, Trinh Van Tuyen, Tran Thi Pha, Van Huu Tap
a Faculty of Biotechnology and Environmental Engineering , Ho Chi Minh City University of Food Industry (HUFI) , Ho Chi Minh City , Viet Nam.
b Hanoi University of Natural Resources and Environment , Ha Noi , Viet Nam.
Environ Technol. 2019 Feb;40(6):683-692. doi: 10.1080/09593330.2017.1404134. Epub 2017 Nov 21.
This study investigated the potential of removing ammonium ([Formula: see text]) from aqueous solutions using corncob based on modified biochar (MBCC) in the fixed-bed column. Corncob biochar was soaked in a mixture of HNO 6.0 M and NaOH 0.3 M to prepare active binding sites for ammonium removal. The effect of initial ammonium concentrations (10-40 mg/L), flow rates (1-9 mL/min) and MBCC fixed-bed heights (8-24 cm) on the breakthrough characteristics of the adsorption system were studied. The results showed that the highest adsorption capacity of fix-bed column, the breakthrough time and value of C/C were 12.83 mg/g, 480 min and 0.862 ± 0.025 at 10 mg/L of initial ammonium concentration, 8 cm of MBCC fixed-bed height and 3 mL/min of flow rate, respectively. The breakthrough curve model in this study also indicated that all Yoon-Nelson, Thomas and Adam-Bohart models well fit with the experimental data with a high R. The results also proved that MBCC can be used as a potential adsorbent for eliminating [Formula: see text] in the fixed-bed column. The saturated MBCC was also regenerated and reused consecutively for four cycles. The usage of mixture of NaOH and NaCl in recovering MBCC was better than NaCl only.
本研究考察了基于改性生物炭的玉米芯（MBCC）在固定床柱中从水溶液中去除铵（[化学式：见原文]）的潜力。将玉米芯生物炭浸泡在6.0 M的HNO₃和0.3 M的NaOH混合溶液中，以制备用于去除铵的活性结合位点。研究了初始铵浓度（10 - 40 mg/L）、流速（1 - 9 mL/min）和MBCC固定床高度（8 - 24 cm）对吸附系统穿透特性的影响。结果表明，在初始铵浓度为10 mg/L、MBCC固定床高度为8 cm、流速为3 mL/min时，固定床柱的最高吸附容量、穿透时间和C/C值分别为12.83 mg/g、480 min和0.862 ± 0.025。本研究中的穿透曲线模型还表明，所有的Yoon - Nelson、Thomas和Adam - Bohart模型都能很好地拟合实验数据，相关系数R较高。结果还证明，MBCC可作为固定床柱中去除[化学式：见原文]的潜在吸附剂。饱和的MBCC也进行了再生，并连续重复使用了四个循环。使用NaOH和NaCl的混合物回收MBCC比仅使用NaCl效果更好。
