Chemically functionalized silica gel with alkynyl terminated monolayers as an efficient new material for removal of mercury ions from water

Choi, Jae Min; Jeong, Dae‐Yong; Cho, Eunae; Jun, Bong‐Hyun; Park, Sung Yong; Yu, Jae‐Hyuk; Tahir, Muhammad Nazir; Jung, Seunho

doi:10.1016/j.jiec.2016.01.020

Cited by 31 publications

(8 citation statements)

References 35 publications

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“…Compared to other methods applied for the uptake of mercury ions such as chemical precipitation [ 11 ], electrolysis [ 12 ], ion-exchange [ 13 ] etc. up to now, the adsorption method is the most popular treatment for the removal of Hg(II) ions because of significant merits such as high efficiency, simplicity and economy [ 14 – 16 ].…”

Section: Introductionmentioning

confidence: 99%

Preparation of chitosan/MCM-41-PAA nanocomposites and the adsorption behaviour of Hg(II) ions

Fu¹,

Ying²,

Hu³

2018

R. Soc. open sci.

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A novel functional hybrid mesoporous composite material (CMP) based on chitosan and MCM-41-PAA was reported and its application as an excellent adsorbent for Hg(II) ions was also investigated. Innovatively, MCM-41-PAA was prepared by using diatomite and polyacrylic acid (PAA) with integrated polymer–silica hybrid frameworks, and then CMP was fabricated by introducing MCM-41-PAA to chitosan using glutaraldehyde as a cross-linking agent. The structure and morphology of CMP were characterized by X-ray diffraction, Fourier transform infrared spectra, thermogravimetric analysis, scanning electron microscopy and Brunauer–Emmett–Teller measurements. The results showed that the CMP possessed multifunctional groups such as –OH, –COOH and –NH2 with large specific surface area. Adsorption behaviour of Hg(II) ions onto CMP was fitted better by the pseudo-second-order kinetic model and the Langmuir model when the initial Hg(II) concentration, pH, adsorption temperature and time were 200 mg l−1, 4, 298 K and 120 min, respectively, as the optimum conditions. The corresponding maximum adsorption capacity could reach 164 mg g−1. According to the thermodynamic parameters determined such as free energy, enthalpy and entropy, the adsorption process of Hg(II) ions was spontaneous endothermic adsorption.

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Section: Introductionmentioning

confidence: 99%

Preparation of chitosan/MCM-41-PAA nanocomposites and the adsorption behaviour of Hg(II) ions

Fu¹,

Ying²,

Hu³

2018

R. Soc. open sci.

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“…However, chemical precipitation inevitably produces a large amount of fine precipitation and suspended solids, which seriously affect the sedimentation and filtration efficiency [84,87]. And the adsorbents currently used in adsorption technology, such as activated carbon [70,88], silica gel [89][90], membranes [91][92][93], etc., have high production costs and poor adsorption performance, which greatly limits the adsorption effect and industrial applications.…”

Section: Removal Of Phosphate and Starch In Wastewatermentioning

confidence: 99%

Magnetic Separation of Impurities from Hydrometallurgy Solutions and Waste Water Using Magnetic Iron Ore Seeding

Han¹,

Sun²,

Sun³

et al. 2021

Iron Ores

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The removal of iron ion from leaching solution is critical for the recovery of value metals, with the method of choice commonly being crystallization (precipitation). This paper summarized the new improvements in iron removal by precipitation methods in recent years and proposed a novel process, magnetic seeding and separation. The new process can promote iron precipitate aggregation and growth on the surface of the magnetic iron ore seeds. A core-shell structure was formed of iron precipitate and magnetic iron ore seeds, which can be magnetized and coalesced in magnetic field, accelerating the solid-liquid separation. The efficient magnetic flocculation and separation offset the poor settleability and filterability of the residues, contributing to the development of the hydrometallurgy process. Moreover, magnetic seeding and separation was also used for the removal of organic and inorganic contaminants from wastewater, significantly improving the purification efficiency. Therefore, iron ore not only played an important role in mining and steel manufacture, but also can be used to solve some problems in crossing fields.

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“…During the last few years, grafting chelation groups into the silica gel surface had been a major way to develop effective adsorbents based on silica gel. Ligand groups containing nitrogen, oxygen, and sulfur atoms have been employed to improve affinities for Hg(II) ions [20,21,22,23]. In particular, polyamine has been widely used as ligands due to its properties of high density of nitrogen as binding sites for Hg(II) [16].…”

Section: Introductionmentioning

confidence: 99%

Facile Fabrication of 3D Graphene–Silica Hydrogel Composite for Enhanced Removal of Mercury Ions

et al. 2019

Nanomaterials

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Adsorption is a highly promising and widely used approach to remove Hg(II) ions from contaminated water. The key to this technology is exploring the effective adsorbent. The three-dimensional (3D) graphene as reduced graphene oxide hydrogel (rGH)-encapsulated silica gel (SG-PEI/rGH) was prepared by a moderate chemical reduction strategy using ascorbic acid. This composite structure was characterized by FTIR, XRD, and SEM analysis and used as adsorbents for Hg(II) ions. Its adsorption capacity toward Hg(II) ions was 266 mg/g and increased about 32% compared with the silica gel because of reduced graphene oxide hydrogel (rGH). Mechanism study showed that the high adsorption ability was due to the formation of an N–Hg complex with multi-amino groups on the surface of polyethyleneimine-modified silica gel (SG-PEI) and the rapid diffusion of adsorbed ions attributed to the rGH network structure. This composite SG-PEI/rGH would be a promising material for the removal of Hg(II) ions.

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Chemically functionalized silica gel with alkynyl terminated monolayers as an efficient new material for removal of mercury ions from water

Cited by 31 publications

References 35 publications

Preparation of chitosan/MCM-41-PAA nanocomposites and the adsorption behaviour of Hg(II) ions

Preparation of chitosan/MCM-41-PAA nanocomposites and the adsorption behaviour of Hg(II) ions

Magnetic Separation of Impurities from Hydrometallurgy Solutions and Waste Water Using Magnetic Iron Ore Seeding

Facile Fabrication of 3D Graphene–Silica Hydrogel Composite for Enhanced Removal of Mercury Ions

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