Ability and mechanism of modified graphene oxide membrane for treatment of printing and dyeing wastewater
Thiourea(TU)modified graphene oxide(GO)nanosheets(named as TU-GO)were prepared under the conditions of m(TU)∶m(GO)=1∶2,reaction temperature 80℃,and reaction time 60 min,and then deposited on polyether sulfone(PES)micropore membrane to obtain TU modified GO membrane(named as TU-GOM).When the loading capacity of TU-GOM on PES was 238.73 mg/m2,the retention rates of Methyl Orange(MO),Rhodamine B(RhB)and methylene blue(MB)were 94.01%,87.07%and 99.67%,respectively.Modified graphene oxide membrane(DES-GOM)was synthesized using TU and choline chloride(ChCl)as a deep eutectic solvent(DES)to further optimize the rejection rate of RhB.Under the optimum conditions of m(TU)∶m(ChCl)=1∶2,modification temperature of 90℃and modification time of 1 h,the retention rates of the prepared DES-GOM for MO and MB were 93.95%and 99.24%,respectively,while that for RhB was increased to 99.16%.The samples were characterized by SEM,EDS,FTIR,XRD and Raman spectroscopy,followed by analysis on the reduction mechanism and stability enhancement mechanism of TU crosslinking GO process.
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