Liu Xiao, Wan Yibei, Liu Penglei, Fu Yanzhen, Zou Weihua
School of Chemical Engineering and Energy, Zhengzhou University, 100# of Kexue Road, Zhengzhou 450001, China.
Water Sci Technol. 2018 Jun;77(9-10):2517-2527. doi: 10.2166/wst.2018.212.
The most ideal conditions for preparing activated carbon from grapefruit peel (GPAC) were studied using NHHPO as a chemical activating agent and the obtained material was characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and Brunauer-Emmett-Teller (BET) analysis. The adsorption capacity of the resulting material has been checked using three phenolic compounds (pyrocatechol (CA), 4-chlorophenol (4-CP) and 2,4-dichlorophenol (2,4-DCP)). The adsorption characteristics of phenolic compounds from aqueous solution by GPAC have been investigated as a function of contact time, pH, initial concentration and temperature. The equilibrium experimental data fitted well with Freundlich and Koble-Corrigan isotherms. The adsorption of the three phenolic compounds on GPAC fitted well with pseudo-second-order kinetic model. Different thermodynamic parameters were also evaluated and it was found that the adsorption was spontaneous, feasible and endothermic in nature. Adsorbents were regenerated by 0.1 mol/L NaOH and GPAC could be reused in phenolic compounds removal.
以NHHPO为化学活化剂，研究了制备柚子皮活性炭（GPAC）的最理想条件，并通过扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）和布鲁诺尔-埃米特-泰勒（BET）分析对所得材料进行了表征。使用三种酚类化合物（邻苯二酚（CA）、4-氯苯酚（4-CP）和2,4-二氯苯酚（2,4-DCP））检测了所得材料的吸附容量。研究了GPAC对水溶液中酚类化合物的吸附特性与接触时间、pH值、初始浓度和温度的关系。平衡实验数据与Freundlich和Koble-Corrigan等温线拟合良好。三种酚类化合物在GPAC上的吸附与准二级动力学模型拟合良好。还评估了不同的热力学参数，发现吸附是自发的、可行的且本质上是吸热的。用0.1 mol/L NaOH对吸附剂进行再生，GPAC可重复用于去除酚类化合物。
