Dye Adsorption Study of Zif-67 Mesoporous Composite with Strong Hydrophobic Effect in Low-Temperature Aqueous Environment
In recent years, the discharge or leakage of dyes has caused severe pollution of water area. Adsorption, for its effectiveness and feasibility, is a good choice to solve this problem. However, the adsorption of dyes in low-temperature aqueous environment has been little studied. In this study, a novel mesoporous adsorption composite namely G-SMS/ZIF-67(C) was synthesized by coating the ZIF-67 doped with graphene oxide (GO) on the surface of spherical mesoporous silica (SMS) and finally modified by high-temperature calcination (C). Compared with activated carbon (AC), the synthesized adsorption composite exhibited a good adsorption capacity of methyl orange (MO) in low-temperature aqueous environment. The adsorption process was consistent with the pseudo-first-order kinetics and Freundlich model. It revealed that the formed mesoporous structure and hydrophobic interactions of the G-SMS/ZIF-67(C) after calcination effectively improved the adsorption performance, with the average adsorption rate and maximal adsorption capacity of G-SMS/ZIF-67(C) 1.8 and 2.91 times higher than that of the ones without calcination , respectively. Moreover, the maximal adsorption capacity of the G-SMS/ZIF-67(C) composite was positively correlated with the temperature. The thermodynamics and mechanism of the adsorption process have been investigated and rationalized
Year of publication: |
[2022]
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Authors: | Zhao, Yiwei ; Ju, Chenggong ; Sun, Hongmei ; Wang, Wei ; Peng, Xiao ; Wu, Yan |
Publisher: |
[S.l.] : SSRN |
Saved in:
freely available
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