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Preparation method of halloysite-biochar composite material

A composite material and biochar technology, applied in chemical instruments and methods, water pollutants, other chemical processes, etc., can solve the problems of mechanical strength, difficult large-scale application, and long activation time of modified composite materials, and achieve The effect of promoting wide application, strong adsorption performance, and simple process

Active Publication Date: 2021-06-04
HAIKOU EXPERIMENTAL STATION CHINESE ACAD OF TROPICAL AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Preparation method of halloysite-biochar composite material
  • Preparation method of halloysite-biochar composite material
  • Preparation method of halloysite-biochar composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Preparation of halloysite-biochar composite material comprises the following steps:

[0023] (1) Coconut shells were pyrolyzed at 500°C for 50 minutes under nitrogen protection, and then ground through an 80-mesh sieve to obtain coconut shell biochar;

[0024] (2) Mix the pyrolyzed coconut shell biochar and halloysite powder according to the mass ratio of 1:0.8, and add water according to the ratio of solid to liquid at 1:10g / ml, and then vigorously After magnetic stirring for 1.5 hours, ultrasonic dispersion at 25kHz at 80°C for 3 minutes, then place the mixture at 30Mpa and heat at 120°C for 20 minutes to obtain the halloysite-biochar mixture;

[0025] (3) The halloysite-biochar mixture was centrifuged at 6000rpm for 8min, the supernatant was discarded, and dried at 100°C for 10h, and passed through an 80-mesh sieve to obtain a halloysite-halloysite composite material.

Embodiment 2

[0027] Preparation of halloysite-biochar composite material comprises the following steps:

[0028] (1) Coconut shells were pyrolyzed at 600°C for 55 minutes under nitrogen protection, and then ground through a 100-mesh sieve to obtain coconut shell biochar;

[0029] (2) Take the halloysite that is crushed through a 60-mesh sieve, and calcined at 850°C for 30 minutes to obtain calcined halloysite powder; and perform ultrasonic pre-dispersion under the conditions of ultrasonic power of 850W and ultrasonic frequency of 55kHz;

[0030] (3) Mix pyrolyzed coconut shell biochar and calcined halloysite powder according to the mass ratio of 1:0.9, and add water according to the material-to-liquid ratio of 1:20g / ml, and start at 55°C at 1800rpm After vigorous magnetic stirring for 2 hours, ultrasonic dispersion at 35kHz at 90°C for 5 minutes, then place the mixture at 50Mpa and heat at 150°C for 30 minutes to obtain a halloysite-biochar mixture;

[0031] (4) The halloysite-biochar mix...

Embodiment 3

[0033] Preparation of halloysite-biochar composite material comprises the following steps:

[0034] (1) Coconut shells were pyrolyzed at 700°C for 60 minutes under nitrogen protection, and then ground through a 100-mesh sieve to obtain coconut shell biochar;

[0035] (2) Take the halloysite that is crushed through an 80-mesh sieve, and calcined at 900°C for 35 minutes to obtain calcined halloysite powder; and perform ultrasonic pre-dispersion under the conditions of ultrasonic power of 900W and ultrasonic frequency of 65kHz;

[0036] (3) Mix pyrolyzed coconut shell biochar and calcined halloysite powder according to the mass ratio of 1:1, and add water according to the material-to-liquid ratio of 1:15g / ml. After vigorous magnetic stirring for 2 hours, ultrasonic dispersion at 35kHz and 90°C for 5 minutes, then place the mixture at 40Mpa and heat at 150°C for 30 minutes to obtain a halloysite-biochar mixture;

[0037] (4) The halloysite-biochar mixture was centrifuged at 7000r...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F101/20C02F101/30
CPCB01J20/12B01J20/10B01J20/20C02F1/288C02F2101/20C02F2101/30
Inventor 盛占武校导艾斌凌郑晓燕郑丽丽杨旸钟爽
Owner HAIKOU EXPERIMENTAL STATION CHINESE ACAD OF TROPICAL AGRI SCI
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