Research and Technology Center of Membrane Processes, Faculty of Chemical Engineering, Iran University of Science and Technology (IUST), Narmak, Tehran, Iran.
Research and Technology Center of Membrane Processes, Faculty of Chemical Engineering, Iran University of Science and Technology (IUST), Narmak, Tehran, Iran.
J Environ Manage. 2018 May 1;213:288-296. doi: 10.1016/j.jenvman.2018.02.071.
Cationic dyes mixture pertraction experiments of Rhodamine B (RhB) and Methylene Blue (MB) using a flat sheet supported liquid membrane (SLM) were performed. Mono-(2-etylhexyl) ester of phosphoric acid (M2EHPA) and bis-(2-etylhexyl) ester of phosphoric acid (D2EHPA) mixture was used as carrier and Sesame oil to dilute the carrier due to its very high viscosity. Acetic acid (AA) was also used as stripper phase. Influences of hydrophobic and hydrophilic nanoparticles were loaded in a carrier at different loadings (from 0 to 6 mg mL) on dyes pertraction at constant operating conditions were investigated. It was found that hydrophilic nanoparticles, including ZnO and TiO decrease dyes pertraction, while hydrophobic nanoparticles, including ZIF-8 and FeO favorably increase this parameter. ZIF-8 was found as the most effective nanoparticles on increasing dyes pertraction and the optimum loading was 2 mg mL. Also, the important process parameters that influence on the dyes mixture pertraction efficiency such as feed concentration, carrier concentration, feed pH and strip concentration were studied. In order to investigate the effects of operating parameters, all experiments were performed at a constant 2 mg mL ZIF-8 loading. Optimum pertraction efficiency of RhB and MB were 90.6 and 79.4%, respectively. They were obtained after 10 h pertraction at optimum experimental conditions with feed concentration of 100 mg L, carrier concentration of 35% (vol), strip concentration of 0.5 mol L, and feed pH of 6. Effect of time on pertraction efficiencies at the optimum conditions were also studied.
采用平板支撑液膜（SLM）对罗丹明 B（RhB）和亚甲蓝（MB）的阳离子染料混合物进行了萃取实验。由于其非常高的粘度，使用磷酸单-（2-乙基己基）酯（M2EHPA）和磷酸双-（2-乙基己基）酯（D2EHPA）混合物作为载体，并用芝麻油稀释载体。乙酸（AA）也被用作反萃相。在恒定操作条件下，研究了不同负载量（0 至 6mg/mL）的亲水性和疏水性纳米粒子负载在载体中对染料萃取的影响。结果表明，包括 ZnO 和 TiO 在内的亲水性纳米粒子会降低染料的萃取率，而包括 ZIF-8 和 FeO 在内的疏水性纳米粒子则有利于提高这一参数。ZIF-8 被发现是提高染料萃取率最有效的纳米粒子，最佳负载量为 2mg/mL。此外，还研究了影响染料混合物萃取效率的重要过程参数，如进料浓度、载体浓度、进料 pH 值和反萃浓度。为了研究操作参数的影响，所有实验均在固定的 2mg/mL ZIF-8 负载下进行。RhB 和 MB 的最佳萃取效率分别为 90.6%和 79.4%。在最佳实验条件下，进料浓度为 100mg/L、载体浓度为 35%（体积）、反萃浓度为 0.5mol/L、进料 pH 值为 6 时，经过 10h 萃取后即可获得。还研究了最佳条件下萃取效率随时间的变化。
