Liu Xiong, Xu Longqi, Liu Yaqing, Zhou Wenqi
School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan 411201, Hunan, People's Republic of China.
Hunan Provincial Key Laboratory of Controllable Preparation and Functional Application of Fine Polymers, Xiangtan 411201, People's Republic of China.
R Soc Open Sci. 2018 Aug 15;5(8):171667. doi: 10.1098/rsos.171667. eCollection 2018 Aug.
Types of resins anchored on citric acid were synthesized and identified. The citric acid-modified resins PS-CA, PS-O-CA and PS-N-CA were synthesized by anchoring citric acid on PS-Cl, PS-OH and PS-NH, respectively. The PS-CA, PS-O-CA and PS-N-CA were used to adsorb Fe, Al, Cu, Pb, Cd and Hg. The influences of pH, adsorption time and metal ion concentration on the adsorption capacities of the resins were investigated. After optimization, PS-CA was a good adsorbent to Fe, Cu, Pb and Cd with values of 143.9 mg g, 77.4 mg g, 18.9 mg g and 119.9 mg g, respectively. PS-N-CA was a good adsorbent to Al and Hg with values of 176.6 mg g and 114.9 mg g, respectively. The adsorption kinetics and adsorption isotherm experiments indicated that the pseudo-first-order rate equation was more appropriate for characterizing the kinetic data and the Langmuir model was more suitable for fitting the equilibrium data. The reusability of the citric acid-modified resins was also evaluated and these resins exhibited considerable reusability.
合成并鉴定了以柠檬酸为锚定基团的树脂类型。柠檬酸改性树脂PS-CA、PS-O-CA和PS-N-CA分别通过将柠檬酸锚定在PS-Cl、PS-OH和PS-NH上合成。PS-CA、PS-O-CA和PS-N-CA用于吸附铁、铝、铜、铅、镉和汞。研究了pH值、吸附时间和金属离子浓度对树脂吸附容量的影响。经过优化，PS-CA对铁、铜、铅和镉是一种良好的吸附剂，吸附量分别为143.9 mg/g、77.4 mg/g、18.9 mg/g和119.9 mg/g。PS-N-CA对铝和汞是一种良好的吸附剂，吸附量分别为176.6 mg/g和114.9 mg/g。吸附动力学和吸附等温线实验表明，准一级速率方程更适合表征动力学数据，Langmuir模型更适合拟合平衡数据。还评估了柠檬酸改性树脂的可重复使用性，这些树脂表现出相当好的可重复使用性。
