Preparation method of halloysite-biochar composite material

Abstract

The invention provides a preparation method of a halloysite-biochar composite material, which comprises the following steps: (1) performing pyrolysis treatment on coconut shells at 500-700 DEG C, and grinding the material to obtain coconut shell biochar; (2) mixing the coconut shell biochar and halloysite powder according to a mass ratio of 1:(0.8-1), adding water, reacting for 1.5-2 hours under the condition of violent magnetic stirring at 1600-1800 rpm, performing ultrasonic dispersion, and performing heating reaction at the pressure of 30-50 Mpa and the temperature of 120-150 DEG C to obtain a halloysite-biochar mixture; and (3) centrifuging the mixture at 6000-8000 rpm for 8-10 min, drying the mixture at 100-110 DEG C overnight, and sieving the mixture to obtain the halloysite-halloysite composite material. The preparation method is simple in process, low in cost, pollution-free and easy for large-scale popularization; the obtained charcoal-halloysite composite material has relatively strong adsorption performance and mechanical performance.

Description

technical field [0001] The invention relates to the technical field of environmental protection engineering, in particular to a preparation method of halloysite-bio-char composite material. Background technique [0002] Biochar, also known as biochar (biochar), is a solid material prepared by high-temperature pyrolysis and carbonization of biomass raw materials under oxygen-limited (anoxic or anaerobic) conditions. It can be used as High-quality energy and soil improver can also be used as reducing agent, fertilizer slow-release carrier or carbon dioxide sequestration agent, etc. It is often used in water purification, heavy metal adsorption, soil improvement and other fields, and has broad application prospects. [0003] However, in the existing process of preparing coconut shell biochar with coconut shell as raw material, it needs a long activation time, and the specific surface area and pore volume of biochar are low, and when biochar is combined with other materials, suc...

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Problems solved by technology

[0003] However, in the existing process of preparing coconut shell biochar from coconut shell, it needs a long activation time, and the specific surface area and pore volume of biochar However, when biochar is combined with other materials, such as halloysite, it often requires long-term high-temperature composite modification and ball milling mechanical treatment, or requires the use of more additives to assist modification, but While improving the specific surface area and pore volume of the modified composite material to achieve better adsorption capacity, it is difficult to effectively maintain the natural nano-tubular structure characteristics of halloysite, which easily leads to the difficulty of modifying the biochar composite material. To achieve stable mechanical strength, high cost, high pollution, low efficiency, and difficult to achieve large-scale application. Therefore, finding a high-efficiency and low-cost preparation method of biochar composite materials can fully improve the adsorption of biochar composite materials. performance, and can effectively enhance the mechanical strength of biochar composite materials, and then realize the wider application of biochar-halloysite composite materials

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