Nanometer-ZnO-loaded expanded vermiculite adsorbing material and preparation method thereof

Abstract

The invention discloses a nanometer-ZnO-loaded expanded vermiculite adsorbing material and a preparation method thereof. The preparation method of the nanometer-ZnO-loaded expanded vermiculite adsorbing material comprises the following steps: adding expanded vermiculite into zinc acetate dihydrate mixed solution, and evenly stirring to obtain zinc acetate mixed solution; then, dropwise adding oxalic acid ethyl alcohol solution into the zinc acetate dihydrate mixed solution, and regulating the pH (Potential Of Hydrogen) value of the zinc acetate dihydrate mixed solution to 6-10; then, stirring the obtained mixture in a constant-temperature water bath kettle at the temperature of 60-90DEG C to react for 0.5-4h, and then filtering to obtain gel; after the gel is roasted for 1.5-3h at the temperature of 450-600DEG C, cooling to the room temperature to obtain the nanometer-ZnO-loaded expanded vermiculite adsorbing material. The obtained nanometer-ZnO-loaded expanded vermiculite adsorbing material can simultaneously adsorb and process heavy metal ions, such as lead, mercury, cadmium, nickel ins and the like in a water body and kill pathogenic bacteria, such as colibacillus in the water body, the adsorption rate of the obtained nanometer-ZnO-loaded expanded vermiculite adsorbing material is 90-99%, the effective killing rate of the obtained nanometer-ZnO-loaded expanded vermiculite adsorbing material on bacteria is above 95%, and the adsorbing material has good and stable thermostability and is safe and nontoxic for a human body.

Description

technical field [0001] The invention relates to the field of heavy metal ion adsorption, in particular to an expanded vermiculite adsorption material loaded with nanometer ZnO and a preparation method thereof. Background technique [0002] The reserves of fresh water resources on the earth are limited, and the fresh water for human consumption only accounts for 0.26% of the total global water, and most of them are ground water. According to estimates from the Institute of Water Education of the United Nations Educational, Scientific and Cultural Organization (UNESCO), the number of people in the world lacking water may reach 3 billion in 2050. China is one of the countries in the world where per capita water resources are extremely scarce. [0003] However, with the discharge of the "three wastes" of heavy metal mining, smelting, and processing industries and the use of sewage irrigation, pesticides, herbicides, and chemical fertilizers, heavy metals such as lead, mercury, ...

AI Technical Summary

Problems solved by technology

However, if the single vermiculite is used as an adsorbent, its adsorption capacity is average. To obtain a better adsorption capacity, the consumption of vermiculite is relatively large, which does not conform to the rational utilization of resources and the economical use agreement.

[0010] Most of the existing antibacterial materials are organic substances, which have disadvantages such as poor heat resistance, easy volatilization, easy decomposition to produce harmful substances, and poor safety.

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