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A method for efficient removal of nitrate in groundwater by fe‑graphene particles

A graphene and nitrate technology, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of complete removal of nitrate ions, high technical requirements, and high cost of physical methods , to achieve the effect of high-efficiency electrolytic reduction to remove nitrate, simple production process and convenient operation

Active Publication Date: 2017-05-17
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the physical method is expensive, does not remove nitrate ions fundamentally and is prone to secondary pollution
The biological denitrification method can completely remove nitrate at the same time, and the cost is low, but it requires high technical conditions and the treatment cycle is long

Method used

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  • A method for efficient removal of nitrate in groundwater by fe‑graphene particles
  • A method for efficient removal of nitrate in groundwater by fe‑graphene particles
  • A method for efficient removal of nitrate in groundwater by fe‑graphene particles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Such as figure 1 Shown is a graph of Fe-graphene particles, and the reactor is a beaker.

[0040] In the experiment, artificially synthesized nitrate polluted water (NO 3 - -N, 50mg / L) 500mL into a beaker, add reducing agent, during the production process of Fe-graphene particles used in the experiment, soaking time in graphene oxide solution is 30 minutes: ①The reducing agent used is iron powder , then the concentration of nitrate nitrogen drops from 50.0mg / L to 47.5mg / L after 48 hours of reaction; 50.0mg / L is reduced to 45.0mg / L, and the removal rate is 96% higher than that of using iron powder as a reducing agent. The results are as follows figure 2 shown.

Embodiment 2

[0042] The beaker used in the experiment and the method of using Fe-graphene particles to remove nitrate are as in Example 1. The difference is that during the production of Fe-graphene particles used in the experiment, the immersion time in the graphene oxide solution is 10 minutes: ① used If the reducing agent is iron powder, the concentration of nitrate nitrogen will drop from 50.0mg / L to 47.5mg / L after 48 hours of reaction; Afterwards, the concentration of nitrate nitrogen dropped from 50.0mg / L to 42.0mg / L, and the removal rate increased by 220% compared with using iron powder as the reducing agent, which greatly improved the removal efficiency of nitrate. The results are as follows image 3 shown.

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Abstract

The invention provides a method for efficiently removing nitrate in underground water by Fe-graphene particles. The method comprises the following steps: adding flake graphite powder into a beaker; adding NaNO3, H2SO4, KMnO4, deionized water and H2O2 at 60 DEG C into the beaker in order; after a low temperature phase, a middle temperature phase and a high temperature phase, carrying out a centrifugation and a freeze drying to obtain graphene oxide powder; preparing a graphene oxide solution, and adding sodium dodecyl benzene sulfonate into the solution; immersing pretreated iron powder into the solution, pour the liquid on a piece of filter paper after immersion to obtain the finished product Fe-graphene particles; water polluted by nitrate is fetched, and the Fe-graphene particle is used as a reducing agent for removing nitrate by reduction reaction; the nitrate accepts electrons and is reduced to nitrogen, nitrite or ammonia, and the purpose for removing nitrate is realized; according to the method, the graphene oxide is used for assisting production of Fe-graphene particles, nitrate in the beaker can be effectively removed, and other auxiliary processing apparatuses are not needed.

Description

technical field [0001] The invention belongs to the technical field of nitrate treatment in water, and in particular relates to a method for efficiently removing nitrate in groundwater by Fe-graphene particles. Background technique [0002] Water is an essential and important substance for human beings to survive, and most of the water on the earth belongs to glaciers or is distributed in places that are difficult to use. Groundwater is the most important water body among the few water resources that humans can use. In my country, groundwater accounts for one-third of the country's total water resources. With the development of society and the enrichment of human life, the exploitation of groundwater is gradually increasing. More than half of the country's regions use groundwater as the main source of water supply, especially northern region. In recent years, the pollution of groundwater has been increasing. In 2011, 55% of the monitoring points in the country had poor or ex...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/467C02F1/58
Inventor 刘翔马雪姣刘芳陈国丽李淼
Owner TSINGHUA UNIV