Thermal response polyion liquid hydrogel for brine desalination

Abstract

The invention discloses a thermal response polyion liquid hydrogel for brine desalination, an ionic liquid monomer for synthesizing the hydrogel is composed of cations with carbon-carbon double bonds and halogen anions, and the ionic liquid monomer is subjected to free radical polymerization crosslinking under the action of an initiator and a crosslinking agent to form the polyion liquid hydrogel. A hydrogel synthetic monomer is the thermal response ionic liquid, each unit in a hydrogel macromolecular structure contains halogen anions, the halogen anions in saline water are blocked from entering the hydrogel, and the halogen anions of the hydrogel cannot be extruded out along with water under the electrostatic action of a positively charged gel skeleton, so that the thermal response ionic liquid is formed. The desalting effect of the hydrogel is improved; the ionic hydrogel has thermal responsiveness, the response temperature can be adjusted from 20 DEG C to 70 DEG C, the hydrogel expands in low-temperature saline water, the expanded hydrogel can shrink at high temperature, desalted water is squeezed out in a liquid form, and saline water desalination is achieved only through narrow temperature change.

Description

technical field [0001] The invention relates to the technical field of salt water desalination, in particular to a heat-responsive polyionic liquid hydrogel for salt water desalination. Background technique [0002] According to a report released by the World Water Resources Institute, more than 1 billion people in the world currently live in water-scarce areas, and by 2025, 3.5 billion people will face water shortages. my country's coastal and inland areas are short of water resources. With the development of the national economy and society, the demand for fresh water resources is becoming increasingly urgent. As a water resource increment technology, brine desalination is an important choice to solve the problem of water shortage in water-scarce areas, and related technologies can be extended to seawater desalination, brackish water development, protection and utilization, sewage resource utilization, industrial water recycling and other fields , help the construction of...

AI Technical Summary

Problems solved by technology

This kind of hydrogel can only achieve 35-60% salt removal rate in light brine, and unfortunately, because ordinary ionic hydrogels are not thermally responsive, it is impossible to adjust the temperature to convert partially desalinated water from the hydrogel Squeeze out of the gel, water can only be squeezed out of the hydrogel by extreme pressure

The combination of thermoresponsiveness and salt removal can be achieved by copolymerizing non-ionic thermoresponsive polymers and polyelectrolytes, but the presence of polyelectrolytes affects the response temperature and sensitivity of thermoresponsive polymers, resulting in insignificant volume shrinkage at high temperatures ; At the same time, because the non-ionic thermoresponsive polymer reduces the concentration of ions in the hydrogel, resulting in a decrease in the desalination effect

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