A zeolite-loaded nano-iron material for removing heavy metals in water and its preparation method

Abstract

The invention relates to a zeolite-loaded nano-iron material and a preparation method thereof. It is composed of zeolite and nano-iron loaded on the pores and surfaces of zeolite particles. The average particle size of the zeolite is 80-100 mesh, and the loading amount of nano-iron is 1 wt%. ~1.3wt%, the particle size is 50~200nm. It is made by soaking and rinsing zeolite particles with HCl solution, 3 Shake the reaction in the solution until the zeolite is saturated to adsorb Fe 3+ , rinsed with deionized water and then added NaBH 4 The solution shakes and reacts, removes the supernatant, freezes and dries to obtain the finished product. The zeolite-loaded nano-iron prepared by the present invention has strong adsorption capacity and reduction ability for pollutants. Tests have shown that the zeolite-loaded nano-iron material of the present invention can realize various heavy metal ions such as Pb in water bodies. 2+ 、Cd 2+ and Cr 6+ The removal rate can reach more than 99%. It has the advantages of high removal rate and fast reaction rate. The preparation process is simple and controllable, and the cost is low. It provides a better technical approach for solving heavy metal pollution in water.

Description

technical field [0001] The invention relates to a composite material for removing heavy metal pollutants in water bodies, in particular to a composite material capable of removing heavy metal ions such as Pb in water bodies 2+ 、Cd 2+ and Cr 6+ The zeolite-loaded nano-iron material and its preparation method, the material can be used as osmosis reaction grid filler, belonging to the field of environmental engineering and environmental materials. Background technique [0002] Heavy metal pollution refers to environmental pollution caused by heavy metals and their compounds. Heavy metals are difficult to degrade in the environment, can accumulate in animals and plants, and gradually enrich through the food chain, and finally enter the human body to cause harm. It is one of the most harmful pollutants to humans. one. In recent years, with the rapid development of my country's industrial and agricultural production, heavy metal pollution has occurred frequently and often in my...

AI Technical Summary

Problems solved by technology

However, due to the following two important factors, the application of this technology is seriously restricted: (1) Iron powder, especially nano-iron, is easily affected by the magnetic force between particles, and will gradually agglomerate and agglomerate during the reaction process, affecting its reactivity

(2) The mineral precipitation (iron oxide and iron hydroxide precipitation) produced during the reaction will also cover the reaction site and reduce the permeability of the medium, resulting in a decrease in the removal efficiency of pollutants

However, most of the loading materials used in current research are clay minerals or activated carbon. Clay minerals often have insufficient macropores and are easy to absorb water and swell in water, resulting in poor permeability and difficult to be used as a PRB reaction medium.

Activated carbon is expensive and often unaffordable economically

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