Gopal K, Mohd N I, Raoov M, Suah F B M, Yahaya N, Zain N N M
Integrative Medicine Cluster, Advanced Medical and Dental Institute, Universiti Sains Malaysia 13200 Kepala Batas Penang Malaysia
Department of Chemistry, Faculty of Science, Universiti Malaya Kuala Lumpur 50603 Malaysia.
RSC Adv. 2019 Nov 13;9(63):36915-36930. doi: 10.1039/c9ra07151b. eCollection 2019 Nov 11.
In this study, activated carbon (AC) coated with a green silicone surfactant (SS) was further incorporated with magnetite particles (FeO) a co-precipitation method to enhance the separation of the newly designed magnetic AC-SS (FeO@AC-SS) in a magnetic field. The properties of this magnetic adsorbent were characterized Fourier transform-infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), X-ray diffraction (XRD), and transmission electron microscopy (TEM). The adsorption characteristics of the FeO@AC-SS adsorbent were examined using 2,4-nitrophenol and 2,4-dichlorophenol as adsorbates. Experiments were performed to investigate the adsorption kinetics, isotherms, thermodynamics as well as the effects of adsorption dosage and solution pH on the removal of both analytes. The kinetic data were well-fitted by the pseudo-second order model and the Freundlich model best described the adsorption isotherm for both analytes. The maximum adsorption capabilities for 2,4-dinitrophenol and 2,4-dichlorophenol reached 43 and 98 mg g, respectively. The analysis was further validated using real industrial effluent, and a removal efficiency of 62.2-98.1% and relative standard deviation value less than 7.2% were attained for both analytes. Thus, the multifunctional adsorbent has potential to function as an adsorbent for the fast, convenient, economical and highly efficient removal of pollutants from wastewater, which is significant for the purification of natural water and industrial effluent.
在本研究中，通过共沉淀法将涂覆有绿色有机硅表面活性剂（SS）的活性炭（AC）与磁铁矿颗粒（FeO）进一步结合，以增强新设计的磁性AC-SS（FeO@AC-SS）在磁场中的分离效果。采用傅里叶变换红外光谱（FT-IR）、热重分析（TGA）、X射线衍射（XRD）和透射电子显微镜（TEM）对该磁性吸附剂的性能进行了表征。以2,4-硝基苯酚和2,4-二氯苯酚作为吸附质，考察了FeO@AC-SS吸附剂的吸附特性。进行实验以研究吸附动力学、等温线、热力学以及吸附剂量和溶液pH对两种分析物去除率的影响。动力学数据与伪二级模型拟合良好，Freundlich模型最能描述两种分析物的吸附等温线。2,4-二硝基苯酚和2,4-二氯苯酚的最大吸附容量分别达到43和98 mg/g。使用实际工业废水进一步验证了该分析方法，两种分析物的去除效率达到62.2-98.1%，相对标准偏差值小于7.2%。因此，这种多功能吸附剂有潜力作为一种吸附剂用于快速、方便、经济且高效地去除废水中的污染物，这对于天然水和工业废水的净化具有重要意义。
