Light-control type-ionic imprinting adsorbent, preparation method and regeneration method
An ion imprinting and adsorbent technology, applied in the fields of light-controlled-ion imprinting adsorbent and preparation and regeneration, can solve problems such as increasing application cost, and achieve the effects of improving adsorption efficiency, protecting the environment and saving costs
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[0032] In this application, a method for preparing carbon nitride is preferred. After mixing melamine and silica, calcining at 550±10°C, and then immersing in ammonium bifluoride solution. Further preferably, the melamine and SiO 2 According to the mass ratio 1:1. More preferably, the heating rate of calcination is 10°C / min. The calcination time is 3h. The immersion time in ammonium bifluoride solution is 1 to 3 days. More preferably, after soaking, it is filtered, washed with water to neutrality, and then dried.
[0033] Another embodiment of the present application provides a light-controlled ion imprinting adsorbent prepared by the above preparation method.
[0034] The third embodiment of the present application provides a method for extracting lithium by using the light control type-ion imprinting adsorbent, which uses visible light to irradiate an aqueous solution containing the light control type-ion imprinting adsorbent and lithium ions.
[0035] The fourth embodiment of ...
Example Embodiment
[0037] Example 1
[0038] Preparation of carbon nitride
[0039] Combine melamine and nano-SiO 2 Mix evenly according to the mass ratio of 1:1, put it into the quartz boat, and place it in the tube furnace. In the air, the temperature rises to 550°C at a heating rate of 10°C / min, keeps it for 3h, and cools naturally. The solid obtained is taken out, soaked in ammonium bifluoride solution for 1-3 days, filtered, washed with water to neutrality, and dried to obtain carbon nitride. The prepared carbon nitride is a mesoporous material with a specific surface area of 80~300m 2 / g, the pore size is 10-45nm.
[0040] Preparation of light-controlled-ion imprinted polymer
[0041] Add 0.3g of dibenzo14 crown 4, 0.286g of 2,5-dicarboxy-4-hydroxyazobenzene and 0.069g of lithium nitrate to 60mL of a mixed solution of methanol and dimethylsulfoxide (methanol and dimethylsulfoxide) The specific volume ratio of sulfone is 4:1) dissolved in it, and then placed for 12 hours to obtain a raw materi...
Example Embodiment
[0048] Example 2
[0049] This example is the same as Example 1, except that spiropyran is used instead of 2,5-dicarboxy-4-hydroxyazobenzene.
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