scholarly journals MoS2-Cysteine Nanofiltration Membrane for Lead Removal

2021 ◽  
Vol 5 (3) ◽  
pp. 41
Author(s):  
Jaewon Jang ◽  
Sangsoo Chee ◽  
Yesol Kang ◽  
Suhun Kim
Keyword(s):  
Isopropyl Alcohol ◽  
Mixed Solvent ◽  
Physical Stability ◽  
High Water ◽  
Lead Removal ◽  
Sonic Energy ◽  
Dimensional Shape ◽  
Mos2 Nanosheet ◽  
Bulk Mos2 ◽  
Water Permeance

To overcome the limitations of polymers, such as the trade-off relationship between water permeance and solute rejection, as well as the difficulty of functionalization, research on nanomaterials is being actively conducted. One of the representative nanomaterials is graphene, which has a two-dimensional shape and chemical tunability. Graphene is usually used in the form of graphene oxide in the water treatment field because it has advantages such as high water permeance and functionality on its surface. However, there is a problem in that it lacks physical stability under water-contacted conditions due to the high hydrophilicity. To overcome this problem, MoS2, which has a similar shape to graphene and hydrophobicity, can be a new option. In this study, bulk MoS2 was dispersed in a mixed solvent of acetone/isopropyl alcohol, and MoS2 nanosheet was obtained by applying sonic energy to exfoliate. In addition, Cysteine was functionalized in MoS2 with a mild reaction. When the nanofiltration (NF) performance of the membrane was compared under various conditions, the composite membrane incorporated by Cysteine 10 wt % (vs. MoS2) showed the best NF performances.

scholarly journals Effect of MgCI2 and CaCI2 on the Bubble Point of Mixed- Solvents (Toluene-Isopropyl Alcohol-H20 System)

2006 ◽  
Vol 6 (2) ◽  
pp. 98
Author(s):  
Nathaniel P. Dugos ◽  
Noel P. Cabigon ◽  
Yolanda P. Brondial
Keyword(s):  
Boiling Point ◽  
Isopropyl Alcohol ◽  
Mixed Solvent ◽  
Mixed Solvents ◽  
Earth Metal ◽  
Solvent System ◽  
Mixed Solvent System ◽  
Boiling Points ◽  
Cost Of Energy ◽  
The Difference

This study investigated the effect of CaCl2 and MgCI2,both alkaline earth metal salts on the boiling points of a mixed-solvent system composed of toluene, isopropyl alcohol and water. The effect of the concentration of the salt on the boiling point of this ternary system was also examined. Results showed that mixed- solvents added with CaCl2 boil at higher temperatures than those with MgCl2even though the latter salt is higher in molal concentration. This proves that MgCI2, which has a smaller ionic radius than CaCl2 is more effective in reducing the molecular affinity to polar and associating solvents (water and isopropyl alcohol) than to the non-polar solvent (toluene). The mixed- solvent system added with MgCl2 registered higher boiling point deviation than those with CaCI2, though both showed positive deviations. Based on the results, either of the two salts can be an effective mass separating agent. However it is shown that MgCl2is better than CaCl2 because the solutions with MgCI2 generally exhibited lower boiling points. Though the difference in temperature deviations of the two salts is statistically not significant, a difference in temperature of one degree is economically significant considering the cost of energy.

Post-synthesis of a covalent organic framework nanofiltration membrane for highly efficient water treatment

2019 ◽  
Vol 7 (42) ◽  
pp. 24205-24210 ◽  
Author(s):  
Chuanyao Liu ◽  
Yunzhe Jiang ◽  
Anjaiah Nalaparaju ◽  
Jianwen Jiang ◽  
Aisheng Huang
Keyword(s):  
Water Treatment ◽  
High Water ◽  
Size Exclusion ◽  
Nanofiltration Membrane ◽  
Covalent Organic Framework ◽  
Highly Efficient ◽  
Post Synthesis ◽  
Post Modification ◽  
Water Permeance ◽  
Organic Framework

A novel covalent organic framework (COF) IISERP-COOH-COF1 membrane with both high water permeance and high ions rejection was developed for desalination through post-modification, which shows superior ions rejection based on size exclusion.

Highly H2O permeable ionic liquid encapsulated metal–organic framework membranes for energy-efficient air-dehumidification

2020 ◽  
Vol 8 (44) ◽  
pp. 23645-23653
Author(s):  
Sunghwan Park ◽  
Hae-Kwon Jeong
Keyword(s):  
Ionic Liquid ◽  
Energy Efficient ◽  
Metal Organic Framework ◽  
High Water ◽  
Improved Stability ◽  
Metal Organic ◽  
Water Permeance ◽  
Organic Framework

An encapsulated IL/MOF membrane shows much improved stability and unprecedentedly high water permeance for air dehumidification.

Electrospray interfacial polymerization for a loose NF membrane: Super-selective dye separation in saline dye wastewater treatment

2021 ◽  
Author(s):  
Yesol Kang ◽  
Jaewon Jang ◽  
Yunho Lee ◽  
In S. Kim
Keyword(s):  
Wastewater Treatment ◽  
Graphene Oxide ◽  
Interfacial Polymerization ◽  
High Water ◽  
Nanofiltration Membrane ◽  
Dye Wastewater ◽  
Sulfonated Graphene ◽  
Water Permeance

A sulfonated graphene oxide (SGO) composite loose nanofiltration membrane (LNM) with high water permeance was fabricated by electrospray interfacial polymerization (EIP) method to treat saline dye wastewater. SGO incorporated EIP...

Efficient exfoliation of bulk MoS2 to nanosheets by mixed-solvent refluxing method

2016 ◽  
Vol 41 (25) ◽  
pp. 10737-10743 ◽  
Author(s):  
Lai-Chun Wang ◽  
Shao-Kui Bao ◽  
Jinming Luo ◽  
Yue-Hua Wang ◽  
Yu-Chun Nie ◽  
...  
Keyword(s):  
Mixed Solvent ◽  
Bulk Mos2

scholarly journals Advantages, limitations, and future suggestions in studying graphene-based desalination membranes

RSC Advances ◽  
2021 ◽  
Vol 11 (14) ◽  
pp. 7981-8002
Author(s):  
Stefania Castelletto ◽  
Alberto Boretti
Keyword(s):  
Water Permeability ◽  
High Selectivity ◽  
Carbon Materials ◽  
Physical Stability ◽  
High Water ◽  
High Salt ◽  
High Chemical ◽  
Salt Rejection ◽  
Monovalent Ions

The potential advantages of novel 2D carbon materials are high water permeability, high selectivity capable of rejecting monovalent ions, with high salt rejection, reduced fouling, and high chemical and physical stability.

TEM study of order, structure and defects of β and martensite in Cu-Al-Mn shape memory alloys

1990 ◽  
Vol 48 (4) ◽  
pp. 188-189
Author(s):  
J.M. Guilemany ◽  
F. Peregrin
Keyword(s):  
Shape Memory ◽  
Orthophosphoric Acid ◽  
Isopropyl Alcohol ◽  
Metastable Phase ◽  
Characteristic Temperature ◽  
Ethanol Solution ◽  
Order Structure ◽  
Thin Foils ◽  
Polycrystalline Alloys ◽  
Diamond Saw

The shape memory effect (SME) shown by Cu-Al-Mn alloys stems from the thermoelastic martensitic transformation occuring between a β (L2,) metastable phase and a martensitic phase. The TEM study of both phases in single and polycrystalline Cu-Al-Mn alloys give us greater knowledge of the structure, order and defects.The alloys were obtained by vacuum melting of Cu, Al and Mn and single crystals were obtained from polycrystalline alloys using a modified Bridgman method. Four different alloys were used with (e/a) ranging from 1.41 to 1.46 . Two different heat treatments were used and the alloys also underwent thermal cycling throughout their characteristic temperature range -Ms, Mf, As, Af-. The specimens were cut using a low speed diamond saw and discs were mechanically thinned to 100 μm and then ion milled to perforation at 4 kV. Some thin foils were also prepared by twin-jet electropolishing, using a (1:10:50:50) urea: isopropyl alcohol: orthophosphoric acid: ethanol solution at 20°C. The foils were examinated on a TEM operated at 200 kV.

The ultrastructure of the abdominal musculature of an orchestid amphipod

1990 ◽  
Vol 48 (3) ◽  
pp. 464-465
Author(s):  
Martin A. Levin ◽  
Lisa L. Cale ◽  
Valerie Lynch-Holm
Keyword(s):  
Intertidal Zone ◽  
High Water ◽  
Abdominal Muscles ◽  
Abdominal Musculature ◽  
Dorsal Muscle ◽  
High Water Mark ◽  
Thoracic Legs ◽  
Orchestia Cavimana

Orchestia is a genus of amphipod in the crustacean class Malacostraca. The order Amphipoda contains over 6000 species commonly called side swimmers, scuds and beach fleas(1). Most are marine bottom-dwellers utilizing their thoracic legs and posterior abdominal uropods for walking, crawling and swimming. However, some, like those in the genera Orchestia and Hyale are semiterrestrial. These amphipods, commonly referred to as “beach fleas,' “beach hoppers” or “sand fleas” can hop vigorously for great distances (up to 50 times their length) by extending their abdomens and telsons against the sand(2).In our study, the ultrastructure of the dorsal muscle cord of Orchestia grillus was examined. Vogel(3) described the abdominal muscles of Orchestia cavimana as consisting of two groups of muscles: a strong, complex, dorsal muscle cord used mainly for hopping and a group of weaker, ventral, longitudinal and oblique muscles.The specimens were collected in clumps of decaying seaweed and other detritus from the intertidal zone near the high water mark at Avery Point Beach, Connecticut.

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