Selenium and zinc doped silicon dioxide composite sol as well as preparation method and application thereof

Abstract

The invention discloses a preparation method of a selenium and zinc doped silicon dioxide composite sol. Different advantages of silicon, selenium and zinc are integrated effectively by doping selenium and zinc in the silicon dioxide composite sol, meanwhile, the addition of the zinc element provides nutrients for a crop, and the photosynthesis, respiration, nitrogen metabolism, hormone synthesisand growth of the crop are guaranteed. The invention further discloses the selenium and zinc doped silicon dioxide composite sol, and an effect of the selenium and zinc doped silicon dioxide compositesol in reducing the content of heavy metals in the crop is better than that of a soil application fertilizer, the absorption of the heavy metals such as cadmium, arsenic and lead in the crop is effectively blocked, the absorption and the enrichment of the heavy metals such as cadmium, arsenic and lead in the crop are greatly reduced, the transfer of the heavy metals such as cadmium and the like to an edible part of the crop is inhibited, and the harm to human bodies is reduced. In addition, a product of the selenium and zinc doped silicon dioxide composite sol can be applied to the productionof selenium and zinc-rich high-quality high-grade rice, the resistance of the rice to the heavy metals is improved by increasing the nutrients of the rice, the absorption and the accumulation of theheavy metals in the rice are reduced, and the selenium enrichment level of the rice is improved.

Description

technical field [0001] The invention belongs to the field of environmental protection, and relates to a selenium-zinc-doped silica composite sol and a preparation method and application thereof. Background technique [0002] my country's Soil Pollution Survey Bulletin shows that the overall national soil environment is not optimistic at present. The soil pollution in some areas is relatively serious. The quality of cultivated land soil environment is worrying. Risk of heavy metal pollution of agricultural products. The total soil pollution rate in the country is 16.1%, among which, the rate of cadmium inorganic pollutants exceeds the standard rate reaches 7.0%. The main element exceeding the standard in agricultural products is heavy metal cadmium, and among all food crops, the rate of cadmium exceeding the standard in rice is the highest. However, as a crop that is easy to absorb and accumulate cadmium, rice is also the largest food crop in my country, and more than 60% of ...

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Problems solved by technology

At the same time, applying silicon fertilizer to the soil can inhibit the absorption of heavy metal cadmium by rice and transport it to the shoot; however, due to the poor solubility of silicon fertilizer, it is easy to be adsorbed and fixed by soil colloids, and the direct application of silicon fertilizer is often inefficient, and the leaf surface Fertilization has the characteristics of high utilization efficiency and fast absorption. The effect of spraying silica sol on reducing the cadmium content of rice is better than soil application of silicon fertilizer. Spraying silica sol on rice leaves can improve the resistance of rice to heavy metals and inhibit cadmium. , arsenic and other heavy metals transported to the grain

[0005] In addition, research on rice also shows that spraying selenium fertilizer on rice can not only resist disease, drought, cold, defrost, and pesticide damage, but also inhibit rice from absorbing heavy metals and reduce the risk of heavy metal poisoning such as cadmium, chromium, and lead. effect, and the ability of plant stems, leaves and roots to absorb heavy metals decreased with the increase of selenium application

[0006] At present, although silica sol, silicon fertilizer, and silicon-selenium sol have been used to reduce the absorption of heavy metals cadmium, arsenic, and lead by crops, the effect of most products is not obvious, the action time is not long, the efficiency is not high, and the effect is single. It cannot effectively block the absorption of cadmium, arsenic, and lead in heavy metals by crops at the same time, and it does not provide much help for plant growth

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