Utilization of annealed aluminum hydroxide waste with incorporated fluoride for adsorptive removal of heavy metals

Liu, Ruiping; Ju, Jiawei; He, Ziliang; Hu, Chengzhi; Liu, Huijuan; Qu, Jiuhui

doi:10.1016/j.colsurfa.2016.05.052

“…Since the development of industrialization, heavy‐metal ions have increasingly been released into the environment, and heavy‐metal pollution has attracted much more attention over the last half century because of the toxicity, persistence, and nonbiodegradability of these metals, particularly when they exceed permissible limits . Cadmium, lead, and copper, whose toxicities and limit values are shown in Table , were chosen as models in this study because of their solubility over a wide range of pH values and their presence in much industrial wastewater …”

Section: Introductionmentioning

confidence: 99%

Facile preparation of a silica‐sphere–poly(catechol hexamethylenediamine) composite for the competitive removal of cadmium(II), lead(II), and copper(II) ions

Wei

¹

,

Dong

²

,

Liu

³

et al. 2017

J of Applied Polymer Sci

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A silica‐sphere–poly(catechol hexamethylenediamine) (PCHA–SiO2) composite was prepared via the one‐step facile polymerization of catechol and hexamethylenediamine; this method uses a silica sphere as a hard template. The chemical structures and morphologies of this composite were characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, and transmission electron microscopy. The adsorption experiments indicated that the PCHA–SiO2 composite served as a very attractive adsorbent for Pb(II)‐, Cu(II)‐, and Cd(II)‐ion removal at lower concentrations and had very good selective adsorption abilities for Pb(II) and Cu(II) ions in a solution contaminated with these three ions at higher concentrations. These interesting results may have been due to the reversible H+ adsorption–desorption properties of the characteristic phenol amine structure of the PCHA–SiO2 composite. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45839.

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Highly Efficient Decomposition of Perfluorocarbons for over 1000 Hours via Active Site Regeneration

Zhang,

Luo,

Chen

et al. 2023

Angewandte Chemie

0

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Tetrafluoromethane (CF4), the simplest perfluorocarbon (PFC), has the potential to exacerbate global warming. Catalytic hydrolysis is a viable method to degrade CF4, but fluorine poisoning severely restricts both the catalytic performance and catalyst lifetime. In this study, Ga is introduced to effectively assists the defluorination of poisoned Al active sites, leading to highly efficient CF4 decomposition at 600°C with a catalytic lifetime exceeding 1,000 hours. 27Al and 71Ga magic‐angle spinning nuclear magnetic resonance spectroscopy (MAS NMR) showed that the introduced Ga exists as tetracoordinated Ga sites (GaIV), which readily dissociate water to form Ga–OH. In‐situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and density function theory (DFT) calculations confirmed that Ga–OH assists the defluorination of poisoned Al active sites via a dehydration‐like process. As a result, the Ga/Al2O3 catalyst achieved 100% CF4 decomposition keeping an ultra‐long catalytic lifetime and outperforming reported results. This work proposes a new approach for efficient and long‐term CF4 decomposition by promoting the regeneration of active sites.

show abstract

Highly Efficient Decomposition of Perfluorocarbons for over 1000 Hours via Active Site Regeneration

Zhang,

Luo,

Chen

et al. 2023

View full text Add to dashboard Cite

Tetrafluoromethane (CF4), the simplest perfluorocarbon (PFC), has the potential to exacerbate global warming. Catalytic hydrolysis is a viable method to degrade CF4, but fluorine poisoning severely restricts both the catalytic performance and catalyst lifetime. In this study, Ga is introduced to effectively assists the defluorination of poisoned Al active sites, leading to highly efficient CF4 decomposition at 600°C with a catalytic lifetime exceeding 1,000 hours. 27Al and 71Ga magic‐angle spinning nuclear magnetic resonance spectroscopy (MAS NMR) showed that the introduced Ga exists as tetracoordinated Ga sites (GaIV), which readily dissociate water to form Ga–OH. In‐situ diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS) and density function theory (DFT) calculations confirmed that Ga–OH assists the defluorination of poisoned Al active sites via a dehydration‐like process. As a result, the Ga/Al2O3 catalyst achieved 100% CF4 decomposition keeping an ultra‐long catalytic lifetime and outperforming reported results. This work proposes a new approach for efficient and long‐term CF4 decomposition by promoting the regeneration of active sites.

show abstract

Utilization of annealed aluminum hydroxide waste with incorporated fluoride for adsorptive removal of heavy metals

Cited by 6 publications

References 29 publications

Facile preparation of a silica‐sphere–poly(catechol hexamethylenediamine) composite for the competitive removal of cadmium(II), lead(II), and copper(II) ions

Facile preparation of a silica‐sphere–poly(catechol hexamethylenediamine) composite for the competitive removal of cadmium(II), lead(II), and copper(II) ions

Highly Efficient Decomposition of Perfluorocarbons for over 1000 Hours via Active Site Regeneration

Highly Efficient Decomposition of Perfluorocarbons for over 1000 Hours via Active Site Regeneration

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