首页|Synthesis of reusable NH2-MIL-125(Ti)@polymer monolith as efficient adsorbents for dyes wastewater remediation
Synthesis of reusable NH2-MIL-125(Ti)@polymer monolith as efficient adsorbents for dyes wastewater remediation
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NH2-MIL-125(Ti)is a Ti-MOFs(MOFs:metal-organic frameworks)with high adsorption properties and is therefore widely used for wastewater purification.However,the powdered MOF material suffers from the dis-advantages of being difficult to separate and being potentially wasted due to easy agglomeration,which limits its application in practical applications.Here,a mesoporous Ti-MOF/polymer(PEG,PVA,and PAM)monolithic material was prepared by freeze casting in liquid nitrogen(-196 ℃)as an adsorbent for wastewater remediation.The composites could be easily picked up with tweezers and used for recovery tests.Characterization results such as XRD,BET,FT-IR,and SEM proved the successful synthesis of Ti-MOF/polymer.Adsorption tests using 100 mg/L methylene blue(MB)simulated wastewater showed that the Ti-MOF/PEG monolithic material had the best adsorption capacity.The order of adsorption was Ti-MOF@PEG10(747.4 mg/g)＞Ti-MOF@PVA10(687.4 mg/g)＞Ti-MOF@PAM10(633.7 mg/g)＞NH2-MIL-125(Ti)(571.4 mg/g).The effects of polymer dosage,different pollutants(methylene blue,methyl orange,indigo,actual textile wastewater),pH,anions,and cations on the adsorption effect of Ti-MOF/polymer were also investigated.It was demonstrated that all the above pollutants were well adsorbed by this Ti-MOF/polymer in the pH range 3-9.The adsorption isotherms and kinetic data are fully consistent with the Langmuir and pseudo-secondary models.This suggests that the adsorption between the pollutant and the adsorbent is a chemical interaction.Thermodynamic studies indicate that the adsorption process is exothermic and spontaneous.This work provides the potential methods to fabricate Ti-MOF/polymer monolith to avoid the pollution from powdery adsorbents that could be practical applications.
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