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A palladium-based nanowire and its preparation and application of reducing nitrate and nitrite in water

A technology of nitrite and nanowires, which is applied in the direction of reduced water/sewage treatment, water pollutants, chemical instruments and methods, etc., can solve the problems of low nitrate removal rate and poor catalytic effect, and achieve the improvement of hydrogen production performance, Excellent catalytic performance and good dispersibility

Inactive Publication Date: 2019-05-31
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to solve the technical problems of poor catalytic effect and low nitrate removal rate of existing catalysts for removing nitrate in water, and provides a palladium-based nanowire and its preparation and application for reducing nitrate and nitrite in water

Method used

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  • A palladium-based nanowire and its preparation and application of reducing nitrate and nitrite in water
  • A palladium-based nanowire and its preparation and application of reducing nitrate and nitrite in water
  • A palladium-based nanowire and its preparation and application of reducing nitrate and nitrite in water

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specific Embodiment approach 1

[0019] Embodiment 1: The palladium-based nanowires in this embodiment are nanowires with silver as the core and AgPd as the shell, and the diameter of the nanowires is 4-6 nanometers; the surface of the nanowires is modified with polyvinylpyrrolidine imine.

[0020] The palladium-based nanowires of this embodiment can completely decompose formic acid and reduce nitrate or / and nitrite at room temperature, have good dispersibility in water, and can be used repeatedly.

specific Embodiment approach 2

[0021] Embodiment 2: The method for preparing the palladium-based nanowire described in Embodiment 1 is carried out in the following steps:

[0022] 1. Add polyvinylpyrrolidone and 1,3-butanediol into a two-necked flask, wherein the ratio of the amount of polyvinylpyrrolidone to the volume of 1,3-butanediol is 1 mmol: (8-9) mL, One port of the two-necked flask is connected to the reflux tube. Under the condition of magnetic stirring, the two-necked flask is heated to 170-175°C and kept under reflux for 10-15 minutes; The other end is an open setting;

[0023] 2. Add concentrated ammonia water to the two-necked flask in step 1, wherein the molar ratio of ammonia water to polyvinylpyrrolidone is 1: (1-1.5), and use glass stoppers to plug the openings and reflux in the two-necked flasks that are not connected to the reflux tube. At the other end of the tube, reflux for 2-3 hours under the condition of magnetic stirring and temperature of 170-175°C, then remove the glass stopper ...

specific Embodiment approach 3

[0025] Specific embodiment three: the difference between this embodiment and specific embodiment two is: Na in step three 2 The molar ratio of S to silver nitrate is 1: (150-200); the others are the same as the second embodiment.

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Abstract

A palladium-based nanowire and its application in preparing and reducing nitrate and nitrite in water, which relates to a catalyst for reducing nitrate in water and its preparation method and application. The invention is to solve the technical problems of poor catalytic effect and low nitrate removal rate of existing catalysts for removing nitrate radicals from water. The palladium-based nanowire of the present invention is a nanowire with silver as the core and AgPd as the shell. The surface of the nanowire is modified with polyvinylpyrrolidineimine. Preparation method: 1. Reflux treatment of polyvinylpyrrolidone and 1,3-butanediol; 2. Add concentrated ammonia water for reflux treatment; 3. Add Na in sequence 2 S, silver nitrate and silver palladium precursor aqueous solution are refluxed and washed to obtain palladium-based nanowires. It can use catalytic hydrogen production from formic acid as a hydrogen source to reduce nitrate and / or nitrite in water as a catalyst.

Description

technical field [0001] The invention relates to a catalyst for reducing nitrate in water body, its preparation method and application. Background technique [0002] Nitrate pollution has become a serious environmental problem. Nitrate from industrial wastewater, agricultural fertilizers and acid rain is the most stable nitrogen oxide family, and the existing nitrate reduction technology has been unable to meet human requirements for the removal of nitrate from polluted water. According to research reports, groundwater in many agricultural countries contains high concentrations of nitrates, and this trend is likely to continue to spread. Excessive nitrates will cause eutrophication in water bodies, and if they are absorbed by the human body, they will suffer from blue baby syndrome and digestive tract. Cancer, etc., the sounding of this alarm bell has encouraged scientific researchers to urgently need to develop a class of nitric acid and removal technology. [0003] Existi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/50B01J31/28C02F1/70C02F101/16
CPCC02F1/70B01J23/50B01J31/28C02F2101/166C02F2101/163B01J35/396B01J35/393B01J35/23
Inventor 于永生刘虎杨微微
Owner HARBIN INST OF TECH