Qu Jia, Chang Liangliang, Liu Mingbao, Cao Baoyue, Li Meilan, Yang Qiang, Gong Wei
Shaanxi Key Laboratory of Comprehensive Utilization of Tailings Resources, Shaanxi Engineering Research Center for Mineral Resources Clean & Efficient Conversion and New Materials, Shangluo University, Shangluo 726000, China.
Polymers (Basel). 2022 Oct 6;14(19):4187. doi: 10.3390/polym14194187.
Beneficiation wastewater contains various types of pollutants, such as heavy metal ions and organic pollutants. In this work, a silica-based amphiphilic block copolymer, SiO-g-PBMA-b-PDMAEMA, was obtained by surface-initiated atom transfer radical polymerization (SI-ATRP) for Cu(II) and sodium oleate adsorption in beneficiation wastewater, using butyl methacrylate (BMA) as a hydrophobic monomer and 2-(dimethylamino)ethylmethacrylate (DMAEMA) as a hydrophilic monomer. FTIR, TGA, NMR, GPC, XRD, N adsorption-desorption isotherms and TEM were used to characterize the structure and morphology of the hybrid adsorbent. The introduction of PBMA greatly increased the adsorption of sodium oleate on SiO-g-PBMA-b-PDMAEMA. Adsorption kinetics showed that the adsorption of Cu(II) or sodium oleate on SiO-g-PBMA-b-PDMAEMA fitted the pseudo-second-order model well. Adsorption isotherms of Cu(II) on SiO-g-PBMA-b-PDMAEMA were better described by the Langmuir adsorption isotherm model, and sodium oleate on SiO-g-PBMA-b-PDMAEMA was better described by the Freundlich adsorption isotherm model. The maximum adsorption capacity of Cu(II) and sodium oleate calculated from Langmuir adsorption isotherm equation reached 448.43 mg·g and 129.03 mg·g, respectively. Chelation and complexation were considered as the main driving forces of Cu(II) adsorption, and the van der Waals force as well as weak hydrogen bonds were considered the main driving forces of sodium oleate adsorption. The adsorbent was recyclable and showed excellent multicomponent adsorption for Cu(II) and sodium oleate in the mixed solution. SiO-g-PBMA-b-PDMAEMA represents a satisfying adsorption material for the removal of heavy metal ions and organic pollutants in beneficiation wastewater.
选矿废水含有各种类型的污染物，如重金属离子和有机污染物。在本研究中，通过表面引发原子转移自由基聚合（SI-ATRP）制备了一种基于二氧化硅的两亲性嵌段共聚物SiO-g-PBMA-b-PDMAEMA，用于吸附选矿废水中的Cu(II)和油酸钠，其中甲基丙烯酸丁酯（BMA）为疏水单体，甲基丙烯酸2-(二甲氨基)乙酯（DMAEMA）为亲水单体。采用傅里叶变换红外光谱（FTIR）、热重分析（TGA）、核磁共振（NMR）、凝胶渗透色谱（GPC）、X射线衍射（XRD）、N2吸附-脱附等温线和透射电子显微镜（TEM）对杂化吸附剂的结构和形貌进行了表征。PBMA的引入大大提高了SiO-g-PBMA-b-PDMAEMA对油酸钠的吸附量。吸附动力学表明，Cu(II)或油酸钠在SiO-g-PBMA-b-PDMAEMA上的吸附很好地符合准二级模型。SiO-g-PBMA-b-PDMAEMA对Cu(II)的吸附等温线用Langmuir吸附等温线模型描述较好，对油酸钠的吸附等温线用Freundlich吸附等温线模型描述较好。根据Langmuir吸附等温线方程计算得到的Cu(II)和油酸钠的最大吸附量分别达到448.43 mg·g和129.03 mg·g。螯合和络合被认为是Cu(II)吸附的主要驱动力，范德华力以及弱氢键被认为是油酸钠吸附的主要驱动力。该吸附剂可循环使用，对混合溶液中的Cu(II)和油酸钠表现出优异的多组分吸附性能。SiO-g-PBMA-b-PDMAEMA是一种用于去除选矿废水中重金属离子和有机污染物的理想吸附材料。
