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Ion-imprinted antifouling nanocomposite membrane for separation of lithium ion
Dongshu Sun,Tianyu Zhou,Yang Lu,Yongsheng Yan,Chunbo Liu,Guangbo Che 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.9
Membrane fouling is a primary challenge restricting the practical application of membrane separation technology. Inspired by the idea that improving hydrophilicity would lead to antifouling performance of membrane material. In this work, ion-imprinted antifouling nanocomposite membrane (LiI-NcMs) blended with GO and TiO2 nanomaterialwas fabricated for selective separation of lithium ion. As a result, markedly improved hydrophilicity was achievedon LiI-NcMs (55.1o for contact angle). LiI-NcMs also showed good selective adsorption capacity in the mixed solutionof Mg2+ and Li+. Moreover, LiI-NcMs exhibited superior stability; after 20 adsorption/desorption cycles a maximumadsorption capacity of 88.1% can be maintained. This work demonstrates a new and facile approach to prepare novelmembrane separation material for a particular substance for efficient selective separation in industrial applications.
Yao Lu,Dongshu Sun,Yang Lu,Yongsheng Yan,Bo Hu 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.4
A surface hydrophilic and antifouling imprinted composite membrane based on zwitterion and dopamine for selective adsorption Li+ from compound has great potential. We investigated the selective adsorption amount for lithium from high Mg2+ and low Li+; the resulting displayed both excellent adsorption amount of Li+ and high selective adsorption efficiency of the fabricated membranes from the compound. Relatively lower contact angle of 50.7o and higher membrane flux value of 11.78mL cm2 min1 were obtained, which indicated the imprinted composite membrane possessed high hydrophilicity. In the BSA protein adsorption experiments, the anti-pollution performance of the imprinted composite membrane was greatly improved. Moreover, the results on perm-selectivity and regeneration ability are 8.94 and 91.4%. Overall results suggest that zwitterion and dopamine can be considered effective for increasing the hydrophilicity and anti-pollution capacity. Moreover, the imprinted composite membranes could be used for selective adsorption of Li+ effectively.
Yanhua Cui,Minjia Meng,Dongshu Sun,Yan Liu,Jianming Pan,Xiaohui Dai,Yongsheng Yan 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.3
We developed a simple phase inversion technique to prepare molecularly imprinted membrane (MIM) at room temperature for membrane selective adsorption and separation of methyl p-hydroxybenzoate (M4HB). The prepared SMIP-MIM was characterized by SEM, FT-IR, TGA. Compared with non-imprinted membrane (NIM1-5) adsorbent, SMIP-MIM1-5 adsorbent with high specific surface area and showed higher binding capacity, faster kinetic and better selectively adsorption capacity for M4HB. The maximum isotherm adsorption capacity for M4HB of SMIPMIM4 was 3.519mg·g−1, and the experimental data was well fitted to the slips model by multiple analysis. The maximum kinetic adsorption capacity and equilibrium adsorption time for SMIP-MIM4 were 1.335mg·g−1 and 160 min, respectively. The mechanism for dynamic adsorption of M4HB onto SMIP-MIM4 was found to follow pseudo-firstorder model and pseudo-second-order model. Additionally, the permeability separation factor of SMIP-MIM4 for M4HB compared to a structural analogues methyl 2-hydroxybenzoate (M2HB) could reach 2.847. The adsorption capacity of SMIP-MIM4 for M4HB and M2HB was 0.549mg·cm−2 and 1.563mg·cm−2, respectively. The adsorption behavior of M4HB through SMIP-MIM4 followed the retarded permeation mechanism.
Dongdong Wang,Yang Lu,Zhuo Sun,Wei Liang,Dongshu Sun,Changli Qi,ChengZhuo Sheng,Xiaopeng Yu 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.2
An aqueous two-phase system (ATPS) containing an ionic liquid (1-(2-methoxyethyl)-3-methylimidazolium bromide) and three organic salts (K3C6H5O7, (NH4)3C6H5O7, and K2C4H4O6) at different temperatures was designed. Binodal data were correlated using two empirical equations, and tie-line data were fit with the utilization of Bancroft and Othmer-Tobias equations. In the systems investigated, three conclusions were drawn from the study of the phase-forming ability of salt through effective excluded volume, Gibbs free energy of ions, and the phase diagram. First, if the same cations of salt were present, the ability of salt to form phases increased with increasing valence of the anion. Second, the larger the effective excluded volume, the stronger the aforementioned ability of salt in forming phases. Third, salt had more ability to form phases if cations (or anions) contained in the salt possessed higher negative Gibbs free energy when the cation (anion) of the salt was the same. The effect of temperature on ATPSs was also investigated. It was found that it was easier to form ATPSs at lower temperature, and the tie-line slope showed growing absolute values as the temperature was decreased.