Multi-layer structure defluoridation agent, preparation method and applications thereof
A technology of multi-layer structure and fluorine removal agent, which is applied in chemical instruments and methods, water/sludge/sewage treatment, metallurgical wastewater treatment, etc., can solve the problem of effluent not meeting the requirements of fluoride ion discharge, the decrease of adsorption capacity of adsorbent, High requirements for equipment and equipment, to achieve good fluoride removal effect, simple separation, and low equipment requirements
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Embodiment 1
[0042] Preparation of fluorine-removing materials at different heating temperatures
[0043] 1. Preparation of fluoride removal materials
[0044] In the first step, add 5.0 g of nano-CaCO to the round bottom flask 3 , 0.2g polyethylene glycol and 0.2g surfactant sodium dodecyl sulfonate, then measure 100ml of water and add it to a round bottom flask, stir and disperse fully for 30min, then add the monomer DMAEA dissolved in the initiator, wherein the initiator It is dimethyl azobisisobutyrate, the dosage is 0.7g, and the dosage of monomer is 2ml, continue to stir and disperse;
[0045] In the second step, after stirring for 30 minutes, the temperature was raised to 50°C, and 5.0 g of vinyl monomer acrylamide was added to the reaction vessel, and the temperature control reaction was continued for 30 minutes;
[0046]In the third step, the temperature is raised to 50°C, 55°C, 60°C, 65°C, 70°C, 75°C, and the ethylenic monomer styrene dissolved with the initiator is added. The ...
Embodiment 2
[0054] 1. Preparation of fluoride removal materials
[0055] In the first step, add 5.0 g of nano-CaCO to the round bottom flask 3 1. Add calcium phosphate 0.1g, 0.2g, 0.3g, 0.4g, 0.5g, 0.6g and 0.2g of surfactant sodium dodecylsulfonate respectively, then measure 100ml of solvent water into the round bottom flask, stir and disperse for 30min Finally, add the monomer DMAEA that dissolves initiator, initiator is dimethyl azobisisobutyrate, consumption 0.7g, monomer DMAEA consumption 2.0ml, continue to stir and disperse;
[0056] In the second step, after stirring for 30 minutes, the temperature was raised to 50°C, and 5.0 g of ethylenic monomer acrylamide was added to the reaction vessel, and the temperature control reaction was continued for 30 minutes;
[0057] In the third step, raise the temperature to 70°C, add the ethylenic monomer styrene dissolved with the initiator, the initiator is dimethyl azobisisobutyrate, the dosage is 0.7g, the dosage of styrene is 7ml, and then...
Embodiment 3
[0064] Preparation of fluorine-removing materials with different monomer DMAEA dosages
[0065] 1. Preparation of fluoride removal materials
[0066] In the first step, add 5.0 g of nano-CaCO to the round bottom flask 3 , 0.2g polyethylene glycol and 0.2g surfactant sodium dodecyl sulfonate, then measure 100ml of solvent water and add it to a round bottom flask, fully stir and disperse for 30min, then add monomer DMAEA 0ml dissolved in initiator, 1ml, 2ml, 3ml, 4ml, 5ml, 6ml, the initiator is dimethyl azobisisobutyrate, the dosage is 0.7g, continue to stir and disperse;
[0067] In the second step, after stirring for 30 minutes, the temperature was raised to 50° C., and 5.0 g of vinyl monomer acrylamide was added into the reaction vessel. Continue temperature control reaction for 30min;
[0068] In the third step, raise the temperature to 70°C, add the ethylenic monomer styrene dissolved with the initiator, the initiator is dimethyl azobisisobutyrate, the dosage is 0.7g, th...
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