Fe/titanium-based biomass carbon composite material as well as preparation method and application thereof
A technology of biomass charcoal and composite materials, applied in chemical instruments and methods, other chemical processes, water/sewage treatment, etc., can solve problems such as weak adsorption capacity of anions, and achieve the advantages of large-scale production, simple process and few steps. Effect
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[0026] The preparation method of the iron / titanium-based biochar composite material of the present invention comprises the following steps: (a) removing the water from the crop straws and then calcining them under airtight conditions at 250-500°C for 0.5-5 hours to obtain biochars; ( b) Take the biochar and add it to the first ferric chloride solution with a concentration of 2~5g / 100ml, soak it for 15~50 hours, then filter it with suction, wash the filter cake until the filtrate is clear, and then heat it at 80~150℃ drying the filter cake; (c) mixing the dried filter cake with titanium dioxide powder with a particle size of less than 15 nanometers, then adding it to a sodium alginate solution with a concentration of 2-5g / 100ml, and stirring for 20-60 minutes to obtain Biomass charcoal / sodium alginate mixed solution; (d) adding the biochar / sodium alginate mixed solution into the second ferric chloride solution with a concentration of 2-5g / 100ml for solidification, followed by dr...
Embodiment 1
[0029] The present embodiment provides a kind of iron / titanium-based biochar composite material, and its preparation method comprises the following steps:
[0030] (a) Calcining air-dried rice straw for 1 hour at 300°C under airtight conditions to obtain biochar;
[0031] (b) Ball mill the prepared biochar and screen it with a 60-mesh sieve. Weigh 25g of the sieved biochar and add it to 100ml of the first ferric chloride solution with a concentration of 2g / 100ml. Stir Evenly, and let it stand for soaking for 24 hours; filter the soaked biochar to remove water, and wash the filter cake repeatedly until the outflowing filtrate is clear, then dry it at 100°C;
[0032](c) All the dried filter cakes are first crushed and screened with a 60-mesh sieve, and then mixed with 2g of titanium dioxide powder (anatase) with an average particle size of about 10 nanometers, which is conducive to the separation of the filter cake and nano-titanium dioxide Mix thoroughly; then add 100ml of sod...
experiment example 1
[0034] Experimental Example 1: Take 0.5 g of the prepared iron / titanium-based biochar composite material and add correspondingly arsenic solutions with a pH of 3 to 11 (50 ml, arsenic concentration of 1 mg / L, As(Ⅴ) and As(Ⅲ) respectively In the test), shake at a constant temperature of 25°C for 4 hours, and the shaking frequency is 180 r / min. After the shaking is over, the filtrate is filtered and the concentration of remaining arsenic is measured with a dual-channel atomic fluorescence spectrophotometer (AFS). The results are as follows: figure 1 shown.
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