Preparation of methylglucamine-functionalized rGO/MWCNTs-OH composite aerogels and its adsorption of boron
Aerogels have promising applications in the field of adsorption.In this study,methylglucamine-functionalized reduced graphene oxide/hydroxylated carbon nanotube aerogels were prepared by hydrothermal synthesis and freeze-drying method for boron removal from salt lake brines.The adsorption behavior of the adsorbent on boron in aqueous solution was investigated,and the adsorption process was in accordance with the pseudo-second-order kinetic model and Freundlich isothermal adsorption model.The maximum adsorption amount was 33.64mg/g when the initial boron concentration was 1000mg/L,pH was 10,the adsorption time was 9h and the temperature was 298K.The response surface method could predict the experimental results and optimize the reaction conditions,and the boron adsorption amount was 32.91mg/g under the optimal conditions.The adsorption mechanism analysis showed that the adsorption process mainly consisted of the complexation of the—OH functional group on the adsorbent with B.The adsorbent still had a high adsorption capacity for B after three adsorption-desorption experiments.The adsorbent had good resistance to coexisting salt interference and good adsorption performance in real brine with an adsorption capacity of 23.87mg/g.This aerogel was potentially valuable for boron extraction from salt lake brines and wastewater.
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