A kind of preparation method of mercapto modified sepiolite heavy metal adsorbent

Abstract

The invention discloses a method for preparing a thio-modified sepiolite heavy metal absorbent, which prepares thio-modified sepiolite adopting a gel process, stirring nature clay sepiolite serving as a substrate at a high speed to form gel, and adding mercaptopropyl silane, and comprises the following steps: 1) dispersing natural clay sepiolite in deionized water to form suspension of sepiolite;2) stirring the suspension of sepiolite in a dispersing machine at a high speed to obtain sepiolite gel; 3) adding mercaptopropyl trimethoxysilane under a high-speed stirring condition, and continuing high-speed stirring to form gel system of thio-modified sepiolite; 4) keeping the gel system at a constant temperature of 80 DEG C for 24 hours; and 5) taking the gel out of the gel system, drying at 65 DEG C, and grinding to obtaining the thio-modified sepiolite. The thio-modified sepiolite prepared by the method has high absorbability, high absorption speed, no secondary pollution, and wide application range; and the preparation method is simple, low in cost and suitable for large-scale promotion and use.

Description

technical field [0001] The invention relates to a preparation technology of a heavy metal adsorbent, in particular to a preparation method of a mercapto-modified sepiolite heavy metal adsorbent. Background technique [0002] Heavy metals generally exist in nature in natural concentrations. With the development of industrial and agricultural production, a large amount of heavy metals are discharged into the environment. According to incomplete statistics, the current global average annual emission of mercury is about 15,000 tons, copper is about 3.4 million tons, lead is about 5 million tons, manganese is about 15 million tons, and nickel is about 1 million tons. on the background value. After entering the environment, heavy metals cannot be biodegraded, but often participate in the food chain cycle, and eventually accumulate in the organism, destroying the normal physiological and metabolic activities of the organism, and endangering human health. The commonly used treatme...

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Problems solved by technology

my country is one of the few countries in the world that is rich in sepiolite. It is widely distributed in Hunan, Jiangxi, and Hebei, but its development and utilization are very backward. At present, the raw materials are still mainly exported.