Biochar-based composite material as well as preparation method and application thereof

Abstract

The invention provides a biochar-based composite material as well as a preparation method and application thereof. The material comprises a potassium-containing biochar substrate and zero-valent manganese loaded on the potassium-containing biochar substrate. The biochar-based composite material disclosed by the embodiment of the invention is wide in raw material source and low in cost. A large amount of waste biomass is generated every year in the agricultural field, such as peel, vegetable residues and tree branches and leaves; watermelon peel, banana peel, cauliflower pedicels and the like in the huge-amount waste are high in potassium content, and can be used as preparation raw materials of the biochar-based composite material, so that resource utilization of solid waste is achieved.

Description

technical field [0001] The invention belongs to the technical field of thallium-containing wastewater treatment, and in particular relates to a biochar-based composite material and its preparation method and application. Background technique [0002] Thallium (Tl) is located in the third main group (IIIA) of the periodic table, and its atomic weight and atomic number are 204.38 and 81, respectively. Tl in nature mainly exists in two oxidation states, Tl(I) and Tl(III). The dual geochemical properties of lithophilic and sulfophilic properties of Tl(I) make it widely distributed in metal sulfide minerals. [0003] The abundance of thallium in the earth's crust is 0.75 mg / kg, but in the secondary environment, thallium is easy to migrate, and thallium-containing ores or minerals can release a large amount of thallium to the environment under secondary oxidation and activate migration. Thallium is a highly toxic heavy metal element. Its toxicity is greater than typical heavy me...

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Problems solved by technology

CN104445732A discloses a process for neutralizing and coagulating heavy metal wastewater containing thallium to remove thallium. The process is carried out in two stages. In the first stage, heavy metal wastewater containing thallium is adjusted to alkalinity by acid and alkali, and high-efficiency coagulants, sulfides, flocculation agent, and then carry out solid-liquid separation through the inclined plate settling tank, the secondary treatment adds sulfide, diatomaceous earth, flocculant to the supernatant purified water after the primary treatment, and separates the solid and liquid through the inclined plate settling tank, the present invention Although the process scheme is effective, it needs to use a large amount of flocculant, diatomaceous earth and other agents, resulting in a large amount of residue and complicated operation

CN205442886U discloses a thallium removal technology device based on ferrate oxidation precipitation. The device is equipped with a stirring mixing device and a mixing agent adding device, which can effectively ensure the sufficient mixing reaction of ferrate and thallium wastewater inside the mixing agent adding device. The removal efficiency of thallium is guaranteed to reach more than 95%, but it is only suitable for the removal of low-concentration thallium in natural water bodies

CN109437386A discloses a method for removing metal thallium in waste water. This method has good effect on certain waste water, but it is not suitable for waste water with low pH<2 to remove thallium

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