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Application of nano-porous molybdenum disulfide controlled by mechanical strain to sea water desalination

A technology of molybdenum disulfide and mechanical strain, which is applied in seawater treatment, general water supply saving, osmosis/dialysis water/sewage treatment, etc. It can solve the problems that have not been reported in the application, and achieve the expansion of application scale, reduction of economic burden and production cost Reduced effect

Active Publication Date: 2015-09-23
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, so far, there has been no report on the application of molybdenum disulfide 2D nanomaterials for molecular level filtration

Method used

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  • Application of nano-porous molybdenum disulfide controlled by mechanical strain to sea water desalination
  • Application of nano-porous molybdenum disulfide controlled by mechanical strain to sea water desalination
  • Application of nano-porous molybdenum disulfide controlled by mechanical strain to sea water desalination

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Example 1: Molecular dynamics simulation experiment of seawater desalination process.

[0026] In this example, the molecular dynamics simulation experiment is used to evaluate the performance of the nanoporous molybdenum disulfide filter membrane in the seawater desalination process under different strain conditions. The specific process is as follows:

[0027] learn from J. Am. Chem. Soc ., 2008 , 130, p16448 and Nano Lett ., 2012 , 12, the graphene molecular sieve research method recorded in p3602, using Comput. Mater. Sci ., 2010 , 48, the molybdenum disulfide crystal structure model reported in p101 was constructed by computer modeling such as figure 2 The length, width and height of the water tank shown correspond to the z-axis, x-axis and y-axis in the three-dimensional Cartesian coordinate system, respectively. The tank is divided into two areas by a nanoporous molybdenum disulfide filter membrane, one side is simulated seawater containing sodium chlor...

Embodiment 2

[0029] Example 2: Experiment on the quantitative relationship between filter membrane strain and water channel.

[0030] In order to quantitatively compare the effects of filter membrane strain on water channels, this example calculates the water flux projected on the cross-section of the molybdenum disulfide filter membrane at the strain levels of 9% (a) and 12% (b). The result is as Figure 4 shown.

[0031] Depend on Figure 4 It can be seen that under the 9% strain condition, three flow channels for conducting water (this region is marked as "A" in (a)) appear near the midpoint of the edges used to define the nanopore triangle. When the strain is increased to 12%, three additional flow channels (marked as “B” in (b)) appear at the corners of the nanopore triangle. It appears that the tension-based control of the MoS2 filter membrane itself can be simply attributed to the structural changes in the nanopores under tension-strain conditions: stretching enlarges the nanopor...

Embodiment 3

[0032] Example 3: Quantification of Molybdenum Disulfide Filtration Membrane Selectivity—Research on the density distribution of water and inorganic salt ions on both sides of the nanopore.

[0033] In this example, a simulated water tank without a piston is used, and the same concentration of brine is set on both sides of the filter membrane. We hope to induce the solvent and ion structure near the nanopore by studying the "open" and "closed" states of the molybdenum disulfide filter membrane The process of changing to examine the selectivity of the molybdenum disulfide filter membrane, the results are as follows Figure 5 shown.

[0034] Depend on Figure 5 It can be seen that when the filter membrane is subjected to 9% and 12% strain levels, the density distribution curve of water shows two peaks near the molybdenum disulfide filter membrane (located at |Z|=0.43 and 0.73nm respectively), representing The first and second solvation interfaces of the molybdenum disulfide ba...

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Abstract

The invention discloses an application of nano-porous molybdenum disulfide controlled by mechanical strain to sea water desalination. Specifically, a molybdenum disulfide nanometer material with a sandwich-like structure and nano-pores serves as a study object, external pull is exerted on the molybdenum disulfide nanometer material to enable the material to generate the mechanical strain and enable the nano-porous structure to achieve controllable open and close states, and then the material can play a role in molecular level filtering operation like sea water desalination. Compared with a traditional reverse osmosis membrane and a graphene filtering membrane, a nano-porous molybdenum disulfide filtering membrane is controlled by the mechanical strain, and the filtering effect is more excellent; the production cost and the energy consumption in the implementation process are remarkably reduced, and the effects of energy conservation, emission reduction and environmental protection are achieved; in addition, the requirement of the method for equipment is low, and the method is beneficial for enlarging the application scale and has remarkable industrial applicability.

Description

technical field [0001] The invention belongs to the technical field of molecular filtration, and relates to a new application of nanoporous molybdenum disulfide controlled by mechanical strain, in particular to its application in seawater desalination. Background technique [0002] With population growth, rapid urbanization, and global climate change, global freshwater resources are facing serious challenges, and it is imperative to find effective solutions. As we all know, seawater desalination technology can play a role in relieving the pressure on fresh water supply. For nearly half a century, the widely known desalination method is reverse osmosis (Reverse Osmosis, RO) (see Sidney, L.; Srinivasa, S., In Saline Water Conversion-II - AMERICAN CHEMICAL SOCIETY , 1963, 38, p117), but this method consumes too much energy, resulting in high cost of desalination water. [0003] In recent years, with the advancement of nanotechnology, new methods for designing membranes bas...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44C02F103/08
CPCY02A20/131
Inventor 李伟峰周如鸿
Owner SUZHOU UNIV
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