Modified activated carbon for reducing bioavailability of tetrabromobisphenol A in contaminated soil

Abstract

The invention relates to modified activated carbon for reducing bioavailability of tetrabromobisphenol A in contaminated soil. A preparation method of the modified activated carbon comprises the following steps: breaking the collected corn stalk into flakes with the length less than 1cm, putting into a drying oven and drying for 12 hours at the temperature of 105 DEG C, then putting into a mufflefurnace and burning for 24 hours at the temperature of 400 DEG C under oxygen-free conditions, blowing nitrogen into the furnace, taking out burning residues after cooling, and sufficiently grinding;and carrying out reaction on the obtained biomass charcoal and 6M HCl for 24 hours at the temperature of 50 DEG C, wherein the massic volume ratio of the biomass charcoal and 6M HCl is 1:4, standing,then centrifuging, and then removing supernatant; and washing residual biomass charcoal by utilizing 2M HCl, removing supernatant, adding mixed liquid of 6M HCl and 22M HF in a massic volume ratio of1:2 and decomposing residual organic matters in the biomass charcoal, washing by utilizing deionized water, carrying out centrifugal solid-liquid separation, and then sequentially carrying out freezedrying and sealed preservation on the modified biomass charcoal for later use. The modified biomass charcoal material provided by the invention can be applied to polluted farmland.

Description

technical field [0001] The invention relates to a modified activated carbon for reducing the bioavailability of tetrabromobisphenol A in polluted soil, and belongs to the technical field of biochar materials. Background technique [0002] As a typical anionic organic pollutant, Tetra-bromobisphenol A (Tetra-bromobisphenol A) is the most widely used brominated flame retardant in the world, accounting for about 60% of the total brominated flame retardant market, the global The total annual production of tetrabromobisphenol A within the scope is 119,700 tons, and the annual output in China reaches 18,000 tons. So far, there are no relevant regulations on the production and use of tetrabromobisphenol A, and its production will increase year by year worldwide, especially with the banning of some polybrominated diphenyl ether flame retardants, which will lead to the use of tetrabromobisphenol A The amount increased. Due to the large-scale production and use of tetrabromobispheno...

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Problems solved by technology

[0004] At present, the methods for remediating organic contaminated soil mainly include incineration, pyrolysis, advanced oxidation, leaching, microbial degradation, and phytoremediation. Due to the high energy consumption and cost of incineration and pyrolysis, advanced oxidation is easy to damage the ecological function structure of soil. It is easy to cause secondary pollution, the generated wastewater still needs to be treated separately, and the microorganism and phytoremediation cycle is long. There is an urgent need for a mild, effective and green repair method or repair material to remove tetrabromobisphenol A and other organic compounds. Contaminate substances or reduce their bioavailability

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