scholarly journals Making of Nanopore NaA Zeolite Membranes for Saline Wastewater Treatment

2017 ◽  
Vol 16 (2) ◽  
pp. 59
Author(s):  
Mansoor Kazemimoghadam
Keyword(s):  
Xrd Analysis ◽  
Zeolite Membrane ◽  
Saline Wastewater ◽  
Operation Condition ◽  
Zeolite Membranes ◽  
Naa Zeolite ◽  
Zeolite Naa ◽  
Temperature Rate ◽  
And Performance ◽  
Membrane Structure And Performance

Zeolite membranes have been studied extensively for more than fifteen years, mainly focusing on gas separation and liquid pervaporation processes. Recently, molecular dynamic simulation has shown that zeolite membranes are theoretically suitable for ion removal from aqueous solutions. This work proposes to use zeolite membranes for desalination of saline recycled wastewater for the possibility of avoiding the costly treatment needed for saline wastewater by Conventional approaches. NaA zeolite membrane indicates that it may be possible to simultaneously separate ions and dissolved organic compounds from water by pervaporation (PV) processes. NaA zeolite membranes composed of a continuous intergrowth of NaA zeolite crystals have been prepared hydro thermally on the surface of porous tubular supports. In this research, synthesis of zeolite NaA membrane was investigated. SEM and XRD analysis have been used to confirm zeolite NaA membrane formation. Membrane performance has been evaluated using an experimental pervaporation setup. Effects of operation condition (temperature, rate and pressure) on the membrane structure and performance have been investigated for NaA zeolite membranes grown onto seeded mullite supports.

Microwave-Assisted Synthesis and Permeation Performance of NaA Zeolite Membrane by Secondary Growth Method

2014 ◽  
Vol 1053 ◽  
pp. 389-393
Author(s):  
Zhi Lin Cheng ◽  
Ying Ying Liu
Keyword(s):  
Gas Permeability ◽  
Knudsen Diffusion ◽  
Secondary Growth ◽  
Zeolite Membrane ◽  
Microwave Assisted Synthesis ◽  
Vapor Phase Transport ◽  
Zeolite Membranes ◽  
Synthesis Time ◽  
Naa Zeolite ◽  
Naa Zeolite Membrane

The highly intergrown NaA zeolite membranes on seeded α-Al2O3substrate were synthesized by microwave heating method. The preparation of seeds with the size of ca.120nm employed the vapor phase transport method (VPT). The XRD patterns indicated that the pure NaA zeolite membranes formed on the seeded α-Al2O3substrate for varied synthesis times. However, the peak intensity of NaA zeolite membrane with synthesis time of 50min obviously decreased, suggesting that the NaA membrane could take place the dissolution at that time. The SEM images indicated that the NaA zeolite membranes with synthesis time of 15-30min had a good integrity and consisted of highly intergrown zeolite crystals, but the NaA membrane with synthesis time of 50min appeared some large defects, further verifying the result of XRD pattern. The gas permeability showed that the maximum of H2/N2and H2/C3H8permselectivities attained 4.23 and 8.24, respectively, higher than those of the corresponding Knudsen diffusion. These results suggested that the diffusion of gases, at least in part, are affected by the pore size of zeolite and the function of molecular sieving can be embodied on the synthesized membrane.

scholarly journals Synthesis and Performance of Deca- Dodecasil 3 Rhombohedral (DDR)-Type Zeolite Membrane In CO2 Separation– A Review

2015 ◽  
Vol 14 (2) ◽  
pp. 48 ◽  
Author(s):  
Muhammad Mubashir ◽  
Yeong Yin Fong ◽  
Lau Kok Keong ◽  
Mohd. Azmi Bin Sharrif
Keyword(s):  
Secondary Growth ◽  
High Energy ◽  
Zeolite Membrane ◽  
Co2 Separation ◽  
Inorganic Membranes ◽  
Zeolite Membranes ◽  
Type Zeolite ◽  
And Performance ◽  
Cryogenic Distillation ◽  
Growth Methods

CO2 capture technologies including absorption, adsorption, and cryogenic distillation are reported. Conventional technologies for CO2 separation from natural gas have several disadvantages including high cost, high maintenance, occupy more space and consume high energy. Thus, membrane technology is introduced to separate CO2 due to their several advantages over conventional separation techniques. Inorganic membranes exhibit high thermal stability, chemical stability, permeability and selectivity for CO2 and CH4 separation as compared to other type of membranes. Zeolite membranes are potential for CO2 separation due to their characteristics such as, well define the pore structure and molecular sieving property. Among the zeolite membranes, DDR membranes exhibit highest selectivity for CO2 and CH4 separation. DDR membranes are synthesized by conventional hydrothermal and secondary growth methods. These methods required very long synthesis duration (25 days) due to extremely low nucleation and crystal growth rate of DDR zeolite. In this review, synthesis and performance of DDR membrane in CO2 separation from CH4 reported by various researchers are discussed. Challenges and upcoming guidelines related to the synthesis DDR membrane and performance of DDR membrane also included.

Microwave-Assisted Secondary Synthesis of NaA Zeolite Membranes Grown on ZrO2 Substrate

2013 ◽  
Vol 477-478 ◽  
pp. 1481-1484
Author(s):  
Zhi Lin Cheng ◽  
Xi Xi Qin
Keyword(s):  
Gas Permeability ◽  
Knudsen Diffusion ◽  
Transformation Method ◽  
Zeolite Membrane ◽  
Sem Images ◽  
Zeolite Membranes ◽  
Xrd Pattern ◽  
Naa Zeolite ◽  
Xrd Patterns ◽  
Naa Zeolite Membrane

The highly intergrown NaA zeolite membranes on seeded ZrO2substrate were synthesized by microwave heating method. The preparation of seeds with the size of ca.60nm employed the vapor phase transformation method (VPT). The XRD patterns indicated that the pure NaA zeolite membranes formed on the seeded ZrO2substrate for varied synthesis times. However, the peak intensity of NaA zeolite membrane after 50min obviously decreased, suggesting that the NaA membrane could take place the dissolution at that time. The SEM images indicated that the NaA zeolite membranes for 15-30min had a good integrity and consisted of highly intergrown zeolite crystals, but the NaA membrane after 50min appeared some large defects, further verifying the result of XRD pattern. The gas permeability showed that the H2/N2and H2/C3H8permselectivities on zeolite membrane attained 4.01 and 8.13, respectively, higher than those of the corresponding Knudsen diffusion. These results suggested that the diffusion of gases, at least in part, are affected by the pore size of zeolite and the function of molecular sieving can be embodied on the synthesized membrane.

Synthesis of NaA zeolite membrane by maintaining pressure difference between the two sides of the support

CrystEngComm ◽  
2018 ◽  
Vol 20 (44) ◽  
pp. 7195-7205 ◽  
Author(s):  
Xue-Ling Wei ◽  
Huan Liu ◽  
Yao-Yi Xu ◽  
Ya-Li Sun ◽  
Zi-Sheng Chao
Keyword(s):  
Active Ingredient ◽  
Pressure Difference ◽  
Zeolite Membrane ◽  
Zeolite Membranes ◽  
Naa Zeolite ◽  
Two Sides ◽  
Naa Zeolite Membrane

Pressure difference assists more Si/Al active ingredient migration to the surface of the support and thus facilitates the formation of uniform and dense zeolite membranes.

Structure, stability and permeation properties of NaA zeolite membranes for H2O/H2 and CH3OH/H2 separations

2018 ◽  
Vol 38 (1) ◽  
pp. 211-219 ◽  
Author(s):  
Sang Moon Lee ◽  
Nong Xu ◽  
John R. Grace ◽  
Anwu Li ◽  
C. Jim Lim ◽  
...  
Keyword(s):  
Structure Stability ◽  
Zeolite Membranes ◽  
Naa Zeolite ◽  
Permeation Properties

scholarly journals Preparation and Characterization of NaA Zeolite Membranes and its Application for Removal of Heavy Metals

2013 ◽  
Vol 2 (3) ◽  
pp. 484-492 ◽  
Author(s):  
Najib Tijani ◽  
Hammou Ahlafi ◽  
Monique Smaihi ◽  
Abdeslam El Mansouri
Keyword(s):  
Heavy Metals ◽  
Zeolite Membranes ◽  
Naa Zeolite ◽  
Removal Of Heavy Metals
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