Modified vermiculite adsorbent as well as preparation method and application method thereof
An adsorbent and vermiculite technology, applied in chemical instruments and methods, adsorption water/sewage treatment, other chemical processes, etc., can solve the problem of low organic matter removal rate, reduce secondary pollution, save water resources, facilitate The effect of mass production
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[0025] The invention provides a kind of preparation method of modified vermiculite adsorbent, comprises the following steps:
[0026] 1) Dip the vermiculite particles in a chemical coagulant to obtain modified vermiculite;
[0027] 2) Roasting the modified vermiculite to obtain a modified vermiculite adsorbent.
[0028] The particle diameter of the vermiculite particles described in step 1) of the present invention is preferably 80-120 mesh, more preferably 90-110 mesh, more preferably 100 mesh; The stone is preferably natural vermiculite, which has high mechanical strength and porosity, and the specific gravity of the vermiculite used is preferably 2.4-2.7g / cm 3 , more preferably 2.45-2.65g / cm 3 , more preferably 2.5 to 2.6 g / cm 3 , The pH value is preferably 7-8, more preferably 7.5; the hardness is preferably 1.0-1.8, more preferably 1.2-1.6, and more preferably 1.4-1.5.
[0029] The chemical coagulant in step 1) of the present invention preferably comprises ferric sulf...
Embodiment 1
[0041] Natural vermiculite (specific gravity is 2.5g / cm 3 , with a hardness of 1.5) crushed and sieved to obtain vermiculite particles with a mesh size of 100 mesh. The vermiculite particles were immersed in ferric sulfate solution with a concentration of 0.25g / L for 24h, and the mass ratio of ferric sulfate solution and vermiculite particles was 1:4. The vermiculite particles are separated from the ferric sulfate solution into solid and liquid through a vacuum filtration device, and then the vermiculite particles are dried. The dried vermiculite particles were placed in a muffle furnace, heated up to 200°C at a rate of 15°C / min, roasted at a constant temperature of 200°C for 1 hour, taken out, and cooled to room temperature to obtain a modified vermiculite adsorbent.
[0042] The specific surface area of the modified vermiculite adsorbent of embodiment 1 is 1.68m 2 g -1 .
Embodiment 2
[0044] Natural vermiculite (specific gravity is 2.55g / cm 3 , with a hardness of 1.4) crushed and sieved to obtain vermiculite particles with a mesh number of 100. The vermiculite particles were immersed in the aluminum sulfate solution with a concentration of 0.25g / L for 24h, and the mass ratio of the aluminum sulfate solution to the vermiculite particles was 1:4. The vermiculite particles are separated from the aluminum sulfate solution into solid and liquid through a vacuum filtration device, and then the vermiculite particles are dried. The dried vermiculite particles were placed in a muffle furnace, heated up to 200°C at a rate of 15°C / min, roasted at a constant temperature of 200°C for 1 hour, taken out, and cooled to room temperature to obtain a modified vermiculite adsorbent.
[0045] The specific surface area of the modified vermiculite adsorbent of embodiment 2 is 1.71m 2 g-1 .
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