期刊
CHEMICAL ENGINEERING JOURNAL
卷 442, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.136276
关键词
Zr-MOFs; Seignette salt; Hierarchical pores; Pb(II) adsorption; DFT calculation
资金
- National Natural Science Foundation of China [51878023]
- Beijing Natural Science Foundation [8202016]
- Great Wall Scholars Training Program Project of Beijing Municipality Universities [CITTCD20180323]
- Beijing Talent Project [2020A27]
- Science and Technology General Project of Beijing Municipal Education Commission [KM202110016010]
- Fundamental Research Funds for Beijing University of Civil Engineering and Architecture [X20147/X20141/X20135/X20146]
A green and facile approach was proposed to modulate NH2-UiO-66 using seignette salt, resulting in the formation of SS-NH2-UiO-66 with hierarchical pores and abundant vacancies. The enhanced sorption performance for lead (Pb(II)) was attributed to the defect sites, which was confirmed by XAS and XPS analysis. DFT calculations revealed that the hierarchical pores and vacancies facilitated the mobility of Pb(II) towards the adsorption active sites.
Within this work, a green and facile approach was proposed to modulate NH2-UiO-66 for purpose of obtaining SS-NH2-UiO-66-X ( X implied the dosage of used SS) using seignette salt (SS). The generation of abundant vacancies with the formation of hierarchical pores boosted their sorption performance for lead (Pb(II)), which strengthened the mass transfer of Pb(II) in SS-NH2-UiO-66-X interior. Particularly, the optimal SS-NH2-UiO-66-5 exhibited good adsorption capacity toward Pb(II) (186.14 mg g-1) and fast diffusion rate (32.1 mg g(-1).min(0.5)) at 25 ?degrees C and initial pH = 5.46, which were about 34.2 and 66.9 times higher than those of the pristine NH2-UiO-66, respectively. SS-NH2-UiO-66-5 could selectively capture the Pb(II) from simulated wastewater containing different co-existing ions. The mechanism was proposed that the defect sites played a significant role in boosting the Pb(II) capture performance, which was further affirmed by X-ray absorption spectroscopy (XAS) and X-ray photoelectron spectra (XPS). The density functional theory calculations (DFT calculations) illustrated that the hierarchical pores and rich vacancies enhanced the Pb(II) mobility toward the adsorption active sites and reduced the adsorption energy between SS-NH2-UiO-66-X and Pb(II). This defect engineering approach could be introduced to modulate other Zr-MOFs like MOF-801, UiO-66 and MOF-808, which presented a general strategy to fabricate defective Zr-MOFs for the boosted adsorption performance toward pollutants removal from wastewater.
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