A Dy6-cluster-based fcu-MOF with efficient separation of C2H2/C2H4 and selective adsorption of benzene

2021 ◽  
Author(s):  
Yong-Zhi Li ◽  
Hai-Hua Wang ◽  
Gang-Ding Wang ◽  
Lei Hou ◽  
Yao-Yu Wang ◽  
...  
Keyword(s):  
Selective Adsorption ◽  
Separation Performance ◽  
Efficient Separation ◽  
Hexanuclear Clusters ◽  
Benzene Toluene

A stable Dy-MOF was constructed based on hexanuclear clusters, and contains F-decorated pores and reveals separation performance for C2H2/CH4, C2H4/CH4 and C2H2/C2H4 and selective adsorption of benzene/cyclohexane and benzene/toluene.

scholarly journals Optimization of Mordenite Membranes Using Sucrose Precursor for Pervaporation of Water-Ethanol Mixtures

Membranes ◽  
2021 ◽  
Vol 11 (3) ◽  
pp. 160
Author(s):  
Abdulaziz A. Alomair ◽  
Yousef Alqaheem
Keyword(s):  
Pyrolysis Temperature ◽  
Operating Temperature ◽  
Selective Adsorption ◽  
Sucrose Concentration ◽  
Low Cost ◽  
Water Flux ◽  
Separation Performance ◽  
Carbon Membranes ◽  
Adsorption Of Water ◽  
High Separation

Post-treated mordenite membranes were prepared using sucrose (C12H22O11) as a carbon precursor to block any pinholes and defects in the zeolite layer. The pervaporation (PV) process was used to separate ethanol from the water. The effects of the sucrose concentration and the pyrolysis temperature (650–850 °C) were investigated, and the resulting high separation performance compared to those post/pre-treated membranes was reported in the literature. In this study, mordenite carbon membranes yielded a water/ethanol separation factor of 990.37 at a water flux of 9.10 g/m2h. The influence of the operating temperature on the performance of the membrane also was considered. It was concluded that the selective adsorption of water through zeolite pores was achieved. The entire preparation procedure was achieved using a rapid, low-cost preparation process.

Selective adsorption of benzene, toluene, and m-xylene on sulfonated carbons

Fuel ◽  
2020 ◽  
Vol 280 ◽  
pp. 118667
Author(s):  
Prabhu Azhagapillai ◽  
Vinu Vijayanathan Pillai ◽  
Ahmed Al Shoaibi ◽  
Srinivasakannan Chandrasekar
Keyword(s):  
Selective Adsorption ◽  
Benzene Toluene

Adsorption Selectivity of Fatty Acid Collector by Synthetic Magnetite

2014 ◽  
Vol 552 ◽  
pp. 263-268
Author(s):  
Han Quan Zhang ◽  
Feng Ling Wang
Keyword(s):  
Fatty Acid ◽  
Sodium Oleate ◽  
Selective Adsorption ◽  
Indirect Measurement ◽  
Adsorption Rate ◽  
Separation Performance ◽  
Mineral Surface ◽  
Adsorption Selectivity ◽  
Synthetic Magnetite ◽  
Concentrate Grade

Selective adsorption of collectors on mineral surface can directly impact the flotation separation performance. Mineral flotation tests indicated that reverse flotation of synthetic magnetite can only bring a 2 to 4 percent increase in the concentrate grade, tailings grade remains high. The amounts of commonly used fatty acid collector, such as sodium oleate, adsorbed onto mineral surface are measured with indirect measurement to investigate adsorption selectivity of fatty acid collectors by synthetic magnetite. Results showed a higher selectivity in collector adsorption for natural magnetite, with 38.25% difference in the average adsorption rate of sodium oleate between the valuable minerals and gangue, but a less selective adsorption of fatty acid collector onto artificial magnetite, with only 1% difference in the average adsorption rate between its valuable and gangue.

Zr-MOFs-incorporated thin film nanocomposite Pebax 1657 membranes dip-coated on polymethylpentyne layer for efficient separation of CO2/CH4

2018 ◽  
Vol 6 (26) ◽  
pp. 12380-12392 ◽  
Author(s):  
Mohammad Mozafari ◽  
Reza Abedini ◽  
Ahmad Rahimpour
Keyword(s):  
Thin Film ◽  
Mixed Matrix Membranes ◽  
Separation Performance ◽  
Mixed Matrix ◽  
Efficient Separation ◽  
Separation Of Co2 ◽  
Thin Film Nanocomposite ◽  
Matrix Membranes

Using thin film nanocomposite (TFN) membranes is an effective method to obtain high CO2/CH4 separation performance as compared to traditional mixed matrix membranes (MMMs).

scholarly journals Poly (Vinyl Alcohol) Composite Membrane with Polyamidoamine Dendrimers for Efficient Separation of CO2/H2 and CO2/N2

2021 ◽  
Author(s):  
yaxin zhao ◽  
Huafeng Tian ◽  
yuge ouyang ◽  
Aimin Xiang ◽  
Xiaogang Luo ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Gas Separation ◽  
Composite Membrane ◽  
High Selectivity ◽  
Gas Adsorption ◽  
Separation Efficiency ◽  
Separation Process ◽  
Poly Vinyl Alcohol ◽  
Separation Performance ◽  
Efficient Separation

Abstract Although polyvinyl alcohol (PVA) membranes are commonly used for CO2 separation, there is still large development space in mechanical properties and high selectivity of the gas separation process. In this study, the gas separation performance and mechanical properties of the (PVA/Cu2+) substrate membranes were improved by introducing polyamidoamine (PAMAM). PAMAM had an important effect on the gas adsorption and separation performance of the membrane. In addition, the gas adsorption and separation properties of the PVA/Cu2+/PAMAM membrane (PPCm) were analyzed and studied when the inlet gas pressure and the species of mixed gases were variable. The results showed that the crystallinity and mechanical properties of the membrane with the PAMAM had been significantly improved. Young’s modulus of PPCm with 30% PAMAM was 132% higher than that of the PVA/Cu2+ composite membrane without PAMAM. In addition, efficient separation efficiency and high selectivity of the gas separation process were observed. The separation factors of the PPCm for CO2/H2 and CO2/N2 were about three times higher than that of the PVA/Cu2+ substrate membranes. These results suggested that the introduction of PAMAM was promising for CO2 separation and permeation.

scholarly journals Performance of Ultrafiltration–Ozone Combined System for Produced Water Treatment

2019 ◽  
Author(s):  
Nita Aryanti ◽  
Tutuk Djoko Kusworo ◽  
Wiharyanto Oktiawan ◽  
Dyah Hesti Wardhani
Keyword(s):  
Oil Content ◽  
Produced Water ◽  
Post Treatment ◽  
Separation Performance ◽  
Significant Finding ◽  
Oil And Grease ◽  
Combined System ◽  
Flux Profile ◽  
Benzene Toluene ◽  
Pre Treatment

Oil exploration waste, also called produced water, contains hazardous pollutants, such as benzene; benzene, toluene, and xylene (BTX); naphthalene, phenanthrene, and dibenzothiophene (NDP); polyaromatic hydrocarbons (PAHs); and phenol. Produced water is characterized by high chemical oxygen demand (COD) and oil content, which exceed the standard limits of regulation. In this study, the combination of ultrafiltration (UF) and ozone pre-treatment and post-treatment were applied for treatment of produced water to minimize its environmental impact. Produced water and membrane were characterized, and their ultrafiltration performance for removal of oil content, benzene, toluene, xylene, and COD. Two commercial Polyethersulfone membranes, with molecular-weight cut-off values of 10 and 20 kDa, were used. The membrane flux profile illustrated that ozone pre-treatment had higher normalized flux than UF only. Separation performance was evaluated based on flux profile and removal of COD, oil and grease content, toluene, and xylene. Significant finding was found where the combination of UF with ozone pre-treatment and post-treatment could significantly eliminate COD, oil content, toluene, and xylene. The rejection of these components was found higher than conventional process, which was in the range of 80 % to 99 %. In addition, almost oil and grease can be removed by using this combined system. Permeate quality of this system confirmed the acceptable level as water discharge.

scholarly journals High-Efficiency Separation of Mg2+/Sr2+ through a NF Membrane under Electric Field

Membranes ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 57
Author(s):  
Huan Liu ◽  
Quan Li ◽  
Benqiao He ◽  
Zhengguang Sun ◽  
Feng Yan ◽  
...  
Keyword(s):  
Electric Field ◽  
High Efficiency ◽  
Chemical Properties ◽  
Dynamics Simulation ◽  
Separation Performance ◽  
Efficient Separation ◽  
High Efficient ◽  
Current Densities ◽  
First Time ◽  
And Chemical Properties

The efficient separation of Sr2+/Mg2+ through nanofiltration (NF) technology is a great challenge because Sr2+ and Mg2+ ions are congeners with the same valence and chemical properties. In this work, an NF membrane under an electric field (EF) was successfully employed to separate Mg2+ and Sr2+ ions for the first time. The effects of current densities, Mg2+/Sr2+ mass ratios, pH of the feed, and coexisting cations on separation performance were investigated. Dehydration of Sr2+ or Mg2+ ions under EF was proved by molecular dynamics simulation. The results showed that a high-efficient separation of Mg2+/Sr2+ was achieved: Mg2+ removal of above 99% and increase in Sr2+ permeation with increasing EF. A separation factor reached 928 under optimal conditions, far higher than that without EF. The efficient separation of Mg2+/Sr2+ ions was mainly due to rejection of most Mg2+ ions by NF membrane and in situ precipitation of partly permeated Mg2+ ions by OH− generated on the cathode under EF. Meanwhile, preferential dehydration of Sr2+ ions under EF due to lower hydration energy of Sr2+ compared with Mg2+ resulted in an increase of permeation of Sr2+ ions. This work provided a new idea for separation of congener ions with similar valence and chemical properties.

scholarly journals Gram-Scale Synthesis of an Ultrastable Microporous Metal-Organic Framework for Efficient Adsorptive Separation of C2H2/CO2 and C2H2/CH4

Molecules ◽  
2021 ◽  
Vol 26 (17) ◽  
pp. 5121
Author(s):  
Nuo Xu ◽  
Yunjia Jiang ◽  
Wanqi Sun ◽  
Jiahao Li ◽  
Lingyao Wang ◽  
...  
Keyword(s):  
Large Scale ◽  
Metal Organic Framework ◽  
Separation Performance ◽  
Solution Theory ◽  
Ambient Conditions ◽  
Efficient Separation ◽  
Pyridinedicarboxylic Acid ◽  
Metal Organic ◽  
Breakthrough Experiments ◽  
Organic Framework

A highly water and thermally stable metal-organic framework (MOF) Zn2(Pydc)(Ata)2 (1, H2Pydc = 3,5-pyridinedicarboxylic acid; HAta = 3-amino-1,2,4-triazole) was synthesized on a large scale using inexpensive commercially available ligands for efficient separation of C2H2 from CH4 and CO2. Compound 1 could take up 47.2 mL/g of C2H2 under ambient conditions but only 33.0 mL/g of CO2 and 19.1 mL/g of CH4. The calculated ideal absorbed solution theory (IAST) selectivities for equimolar C2H2/CO2 and C2H2/CH4 were 5.1 and 21.5, respectively, comparable to those many popular MOFs. The Qst values for C2H2, CO2, and CH4 at a near-zero loading in 1 were 43.1, 32.1, and 22.5 kJ mol−1, respectively. The practical separation performance for C2H2/CO2 mixtures was further confirmed by column breakthrough experiments.

Field-enhanced selectivity in nanoconfined ionic transport

Nanoscale ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 6512-6521 ◽  
Author(s):  
Ke Zhou ◽  
Zhiping Xu
Keyword(s):  
Electric Field ◽  
External Electric Field ◽  
Fluid Transport ◽  
Ionic Transport ◽  
Separation Performance ◽  
Efficient Separation ◽  
Highly Efficient ◽  
Enhanced Selectivity

Fluid transport confined in nanochannels shows highly efficient separation performance with the help of an external electric field.

Efficient separation of propylene and propane on SAPO-17 molecular sieve

2021 ◽  
pp. 1-6
Author(s):  
Yansi Tong ◽  
Jiacheng Xing ◽  
Caiyi Lou ◽  
Danhua Yuan ◽  
Wei Huang ◽  
...  
Keyword(s):  
Molecular Sieve ◽  
Room Temperature ◽  
Membered Ring ◽  
Dynamic Adsorption ◽  
Separation Performance ◽  
Good Separation ◽  
Efficient Separation ◽  
Strong Adsorption ◽  
Application Potential ◽  
Breakthrough Experiments

In this study, the separation performance of propylene and propane on SAPO-17 molecular sieve was investigated by static and dynamic adsorption. The adsorbent possessed good regeneration behavior because the strong adsorption of propylene at room temperature was eliminated by ion exchange treatment. Dynamic adsorption experiments revealed that the kinetic separation selectivity of propylene and propane was as high as 1980, which could be attributed to the energy barrier difference when diffusing through the eight-membered ring of SAPO-17 molecular sieve. The breakthrough experiments verified the good separation performance of the SAPO-17 adsorbent, which suggests that it has considerable application potential in propylene/propane separation.

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