Article
Biochemistry & Molecular Biology
Yasuhisa Hasegawa, Chie Abe, Mayumi Natsui, Ayumi Ikeda
Summary: In this study, a polycrystalline CHA-type zeolite layer with Si/Al = 18 was successfully formed on a porous alpha-Al2O3 tube, and the gas permeation properties were determined for various gases at different temperatures. The membrane exhibited selective permeation behavior based on molecular size, with high selectivities observed for N-2/SF6 and CO2/CH4. However, the CO2/N-2 selectivity was relatively low. These results suggest that the high-silica CHA-type zeolite membrane has potential for separating CO2 from CH4 through molecular sieving.
Article
Chemistry, Multidisciplinary
Guang Xiong, Feifei Meng, Jiaxu Liu, Liping Liu, Leping Zhao
Summary: Innovative hydrothermal method was successfully applied for synthesizing hierarchical ZSM-5/beta composite zeolites, which exhibited superior characteristics and catalytic performance. The pore structure and acid sites of the composite can be adjusted by changing the mass ratio, providing new possibilities for the cracking reaction.
Article
Engineering, Chemical
Hua Liu, Xuechao Gao, Shengxian Wang, Zhou Hong, Xuerui Wang, Xuehong Gu
Summary: High-silica CHA (SSZ-13) zeolite membranes show great potential for CO2 separation, but practical application is limited by high investment costs. In this study, SSZ-13 zeolite membranes were successfully synthesized on hollow fibers with different pore sizes, achieving good CO2/CH4 selectivity and CO2 permeance on membranes with 150 nm pores. Evaluation of gas permeation found that small molecules mainly pass through zeolitic pores, while larger molecules are more sensitive to non-zeolitic pores.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Engineering, Environmental
Tao Zhou, Mengyang Shi, Lingjie Chen, Chao Gong, Ping Zhang, Jixian Xie, Xuerui Wang, Xuehong Gu
Summary: In this study, all-silica STT zeolite membranes were prepared for capturing hydrogen from coke oven gas as a clean energy resource. The membranes exhibited high selectivity and stability, presenting a new possibility for hydrogen separation.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Chemical
Catia Algieri, Enrico Drioli
Summary: Membrane-based technology is attracting attention due to its low energy consumption, mild operating conditions, and high efficiency. Polymeric membranes are widely used for their low cost and reproducible preparation, but face issues like fouling and trade-off between permeability and selectivity. Inorganic membranes like zeolite membranes, with their hydrophilic nature, high stability, permeability, and selectivity, offer solutions to these problems. Their molecular-level pore size and adsorption property make them suitable for a variety of separation processes, although challenges like reproducibility, defects, and high manufacturing costs still hinder their industrial-scale application.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Chemical
Chunyan Chen, Qian Liu, Wanxin Chen, Fangzhou Li, Guoqing Xiao, Chunlin Chen, Ruili Li, Jian Zhou
Summary: In this study, a polyvinylidene fluoride composite membrane based on 13-cyclodextrin and zeolitic imidazole skeleton-8 nanoparticles was prepared and used for the removal of Pb2+ and Cu2+ from wastewater. The composite membrane showed excellent adsorption capacity, demonstrating its tremendous potential for industrial applications.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Engineering, Chemical
Petr Stanovsky, Monika Benkocka, Zdenka Kolska, Miroslav Simcik, Petr Slepicka, Vaclav Svorcik, Karel Friess, Marek C. Ruzicka, Pavel Izak
Summary: Membrane separations for biogas upgrading can be improved by activation and grafting methods, with UV activation leading to significantly increased gas permeability. RO membranes grafted with cysteamine after UV activation showed a 100% increase in permeability, outperforming TFC RO membranes activated by diode discharge plasma.
JOURNAL OF MEMBRANE SCIENCE
(2022)
Article
Engineering, Chemical
Peng Du, Jieyu Song, Xuerui Wang, Yuting Zhang, Jixian Xie, Gang Liu, Yongli Liu, Zhenwei Wang, Zhou Hong, Xuehong Gu
Summary: Efficient hydrogen separation is crucial from the cracked tail gas of ethylene plant. DD3R zeolite membranes were developed for this purpose, showing high selectivity and stability under harsh conditions. The efficient scale-up synthesis method led to the production of high-quality membranes suitable for industrial applications.
JOURNAL OF MEMBRANE SCIENCE
(2021)
Article
Polymer Science
Mallikarjunagouda Patil, Shridhar N. Mathad, Arun Y. Patil, Muhammad Nadeem Arshad, Hajar Saeed Alorfi, Madhu Puttegowda, Abdullah M. Asiri, Anish Khan, Naved Azum
Summary: This study presents the synthesis of modified PVA-g-St-g-PMA copolymers and the fabrication of PVA-g-AC composite membranes using microwave irradiation technique and potassium persulfate initiator. The modified composite membranes showed excellent permeability and selectivity, as well as the advantages of easy handling and reusability.
Article
Engineering, Chemical
Fatemeh Hamidavi, Ali Kargari, Ali Eliassi
Summary: The study found that with a low percentage of nanosilica, permeability increased and selectivity decreased. As the nanosilica loading increased, silica particles dispersed more uniformly in the polymer matrix, forming membranes without any defects.
SEPARATION AND PURIFICATION TECHNOLOGY
(2021)
Article
Chemistry, Applied
Yeon Jung Oh, Su Kyung Kang, Ah Hyun Lee, Sanha Park, Sejin Kim, Jungkyu Choi, Pyung Soo Lee
Summary: MFI membranes were synthesized using composite seeds consisting of zeolite nanocrystals and amorphous silica nanoparticles. The addition of silica nanoparticles to the seed layer effectively reduced non-zeolite defects in the MFI membranes. The zeolite membrane prepared from a seed layer with 75% zeolite and 25% silica particles exhibited the highest N2/SF6 gas selectivity and N2 gas permeance.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Qiu-Ping He, Yun Zou, Peng-Fei Wang, Xiao-ming Dou
Summary: Silicalite-1 zeolitic membranes were successfully fabricated on alpha-Al2O3 support using templated and template-free methods for vapor permeation separation of DCB isomers. The template-free zeolitic membrane showed higher p-DCB selectivity due to fewer inter-crystalline gaps, achieving selectivity values of up to 165 and 113 for p-/m-DCB and p-/o-DCB binary systems, respectively.
Article
Engineering, Environmental
Zhonghao Peng, Ze Liu, Yu Gao, Jiayu Liu, Dongmin Wang, Hongying Liu, Yanbo Zhang, Li Li
Summary: This paper investigates the effects of various factors on the synthesis of DDR zeolite using silica fume as raw material, and determines the optimum synthesis condition, which reduces the cost of synthesis and achieves the utilization of waste materials.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Environmental
Lian Liu, Xingfa Deng, Yan He, Xue-min Cui
Summary: In recent years, the rapid development of zeolite membrane in water treatment technology has been hindered by the complex traditional preparation process. In this study, a metakaolin/slag composite NaA zeolite membrane was prepared using a low-temperature water bath method, and it showed excellent acid resistance and high removal efficiency for Ca2+ in hard water. The composite zeolite membrane had enhanced mechanical strength and crystallinity, and maintained its removal abilities even after regeneration cycles, suggesting its potential for industrial production.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2023)
Article
Engineering, Chemical
Gang Li, Shuanshi Fan, Zijian Zhang, Yanhong Wang, Xuemei Lang, Jing Li
Summary: SAPO-34 zeolite membranes were activated by UV radiation at low temperatures, reducing grain boundary defects. The successful detemplation of SAPO-34 zeolite powders using UV radiation was confirmed by FTIR spectroscopy, TGA, and nitrogen adsorption-desorption. The quality of UV-detemplated SAPO-34 membranes was influenced by the irradiance. Under optimal conditions, the membranes exhibited moderate H-2 permeance and high H-2/CO2 permselectivity.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
