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CDI module for removing fluoride ions in aqueous solution, and application thereof

A technology of aqueous solution and fluoride ion, applied in water pollutants, separation methods, water/sewage treatment, etc., can solve problems that have not been reported or rarely reported, and achieve improved conductivity, increased surface area, and good long-term stability Effect

Pending Publication Date: 2019-11-05
DONGGUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current research mainly focuses on the development of binary hydrotalcites, while the research on ternary doped hydrotalcite materials is rarely reported; in addition, the application in capacitive deionization and defluorination technology has not been reported.

Method used

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  • CDI module for removing fluoride ions in aqueous solution, and application thereof
  • CDI module for removing fluoride ions in aqueous solution, and application thereof
  • CDI module for removing fluoride ions in aqueous solution, and application thereof

Examples

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Embodiment 1

[0037] The mass is Ni(NO 3 ) 2 ·6H 2 Graphene oxide with 7.2% O mass was uniformly dispersed in 250mL distilled water, ultrasonically treated for 40min, and 0.005M Ni(NO 3 ) 2 ·6H 2 O, 0.005M Co(NO 3 ) 2 ·6H 2 O, 0.005MAl(NO 3 ) 3 9H 2 O, then add 0.005M urea. Then, the mixed solution was continuously magnetically stirred at 100° C. for 48 h and then transferred to a round-bottomed flask, and then the mixture was filtered and washed three times with distilled water and ethanol. The precipitate was then dried overnight at 80 °C to obtain NiCoAl-LDH / rGO powder. On this basis, the NiCoAl-LDH / rGO composite was heated at 2 °C min under an argon atmosphere. -1 The heating rate, 500 ℃ calcined for 4h, to get NiCoAl-LMO / rGO nano-hybrid (obtained products such as figure 1 shown), under the same conditions without adding graphene oxide, pure NiCoAl LMO was prepared.

[0038] The CDI electrode module uses activated carbon treated with nitric acid (marked as H-AC) as the cat...

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Abstract

The invention relates to a CDI module for removing fluoride ions in an aqueous solution, and an application thereof, and relates to the technical field of capacitive deionization. The CDI module for removing fluoride ions in the aqueous solution comprises two electrodes, wherein one of the two electrodes is a NiCoAl-LMO / rGO composite material electrode, and the NiCoAl-LMO / rGO composite material electrode is prepared by the following steps: uniformly dispersing graphene oxide in distilled water, adding a Ni, Co and Al metal salt solution, adding urea, performing mixing to uniformity in order toobtain a solid product, and calcining the solid product to obtain the NiCoAl-LMO / rGO composite material. The NiCoAl-LMO / rGO composite material formed by the addition of cobalt atoms provides many mesopores for the adsorption of fluorine. In addition, the introduction of graphene improves the conductivity of NiCoAl-LMO / rGO.

Description

technical field [0001] The invention relates to a CDI module for removing fluorine ions in aqueous solution and its application, and relates to the technical field of capacitive deionization. Background technique [0002] Due to population growth and environmental pollution, two-thirds of the planet's population is facing a serious shortage of clean water. Natural fluoride in drinking water or fluoride-containing wastewater can enter the human body through the gastrointestinal tract. Excess fluoride ions in drinking water can lead to permanent bone and joint deformation, as well as fluoridated teeth. Therefore, the effective removal of fluoride in wastewater has become an increasingly important topic. At present, there are various technologies for removing fluoride from wastewater, such as adsorption method, precipitation method, membrane method, ion exchange method, capacitive deionization technology, etc. Among these methods, capacitive deionization technology (CDI, Cap...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/469C02F101/14
CPCC02F1/4691C02F2101/14
Inventor 王刚李长平吕斯濠
Owner DONGGUAN UNIV OF TECH