School of Light Industry, Beijing Technology and Business University, No. 11 Fucheng Road, Haidian District, Beijing 100048, China.
Molecules. 2023 Feb 21;28(5):2021. doi: 10.3390/molecules28052021.
The discharge of industrial phenol pollutants causes great harm to the natural environment and human health. In this study, phenol removal from water was studied via the adsorption of Na-montmorillonite (Na-Mt) modified by a series of Gemini quaternary ammonium surfactants with different counterions [(CHCONH(CH)N (CH)(CH) N(CH) (CH)NHCOCH·2Y, Y = CHCO, CHCOO and Br, 12-2-12·2Y]. The results of the phenol adsorption indicated that MMt-12-2-12·2Br, MMt-12-2-12·2CHCO and MMt-12-2-12·2CHCOO reached the optimum adsorption capacity, which was 115.110 mg/g, 100.834 mg/g and 99.985 mg/g, respectively, under the conditions of the saturated intercalation concentration at 2.0 times that of the cation exchange capacity (CEC) of the original Na-Mt, 0.04 g of adsorbent and a pH = 10. The adsorption kinetics of all adsorption processes were in good agreement with the pseudo-second-order kinetics model, and the adsorption isotherm was better modeled by Freundlich isotherm. Thermodynamic parameters revealed that the adsorption of phenol was a physical, spontaneous and exothermic process. The results also showed that the counterions of the surfactant had a certain influence on the adsorption performance of MMt for phenol, especially the rigid structure, hydrophobicity, and hydration of the counterions.
工业含酚污染物的排放对自然环境和人体健康造成了极大的危害。本研究采用一系列不同反离子的Gemini 季铵盐表面活性剂[(CHCONH(CH)N(CH)(CH)N(CH) (CH)NHCOCH·2Y，Y = CHCO，CHCOO 和 Br，12-2-12·2Y]对钠基蒙脱石(Na-Mt)进行改性，并研究了其对水中苯酚的吸附去除性能。苯酚吸附结果表明，在饱和插层浓度为原始 Na-Mt 的阳离子交换容量(CEC)的 2 倍、吸附剂用量为 0.04 g、pH=10 的条件下，MMt-12-2-12·2Br、MMt-12-2-12·2CHCO 和 MMt-12-2-12·2CHCOO 的吸附量达到最大，分别为 115.110、100.834 和 99.985 mg/g。所有吸附过程的吸附动力学均符合准二级动力学模型，吸附等温线更符合 Freundlich 等温线模型。热力学参数表明，苯酚的吸附是一个物理、自发和放热的过程。研究结果还表明，表面活性剂的反离子对 MMt 吸附苯酚的性能有一定影响，特别是反离子的刚性结构、疏水性和水化作用。
