A review of geopolymer and its adsorption capacity with molecular insights: A promising adsorbent of heavy metal ions

Liang, Kaikang; Wang, Xing Quan; Chow, Cheuk Lun; Lau, Denvid

doi:10.1016/j.jenvman.2022.116066

Cited by 31 publications

(6 citation statements)

References 142 publications

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“…This affects subsequent comparisons, as each type of alkali-activated material requires a different SiO 2 /Me 2 O (Me = Na or K) molar ratio at synthesis, which indicates the amount of alkali in the material. While the molar ratio for AA/AZF with SiO 2 /Me 2 O = 7.5 for geopolymers, this ratio is typically in the range of 3 to 5, i.e., the geopolymer material contains more alkalis that can be released and promotes the precipitation of heavy metals [25].…”

Section: Laboratory Adsorption Experiments-continuous Flowmentioning

confidence: 99%

Adsorption of Heavy Metals on Alkali-Activated Zeolite Foams

Svobodová,

Tišler,

Peroutková

et al. 2024

Materials

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Elevated concentrations of heavy metals in natural waters can cause significant ecological problems. It is therefore essential to ensure their removal from any water discharged into the environment immediately, especially in case of an accident, where there is a risk of releasing large quantities or high concentrations. The aim of this paper is to test a newly developed adsorbent for the removal of heavy metals from aqueous solutions—in particular, it is very fast adsorption, and thus efficiency, during clean-ups. The alkali-activated foamed zeolite adsorbent was laboratory-prepared and -tested in both batch and flow-through arrangements on single and multi-component solutions and compared with natural zeolite. The experimental setup for batch adsorption consisted of a set of samples and solutions containing iron, cobalt, manganese, zinc and nickel. The samples were put on a horizontal shaker with a 500 mg adsorbent loading in a 50 mL solution. The column adsorption experimental setup consisted of a glass column with an inside diameter of 15 mm and a bed length of 165 mm. A measured amount of each adsorbent was added to the column to achieve a filter fixed-bed height of 160 mm. The high efficiency of the tested adsorbent on various heavy metals was confirmed. The adsorbent has a high potential for use in decontamination processes, water protection and landscape revitalization. Due to its rapid precipitation and subsequent fixation of metal cations in the form of insoluble oxide or hydroxide, it can be used as an emergency adsorbent, the great advantage of which is its low production cost and natural origin.

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Section: Laboratory Adsorption Experiments-continuous Flowmentioning

confidence: 99%

Adsorption of Heavy Metals on Alkali-Activated Zeolite Foams

Svobodová,

Tišler,

Peroutková

et al. 2024

Materials

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“…Furthermore, during the geopolymerization process, the mechanisms such as dissolution, gelation, and condensation reactions occur simultaneously to produce geopolymer materials [81,82]. First of all, the aluminosilicate parent mineral is broken down through alkaline digestion and hydrolysis processes and the formation of aluminate and silicate monomers is aided by the dissolution [83] as expressed in Fig. 2.…”

Section: Geopolymermentioning

confidence: 99%

Diverse material based geopolymer towards heavy metals removal: a review

Arokiasamy

Abdullah

Rahim

et al. 2023

Journal of Materials Research and Technology

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“…Geopolymer is an inorganic polymer material obtained from the alkali activation of aluminosilicate sources, 12 and as a novel class of adsorbents, it has been extensively employed for the remediation of water contaminated with hazardous pollutants. 13 Geopolymers possess a three-dimensional network with an amorphous structure, formed through the polymerization of aluminum oxide and silicon oxide tetrahedra, which have abundant stomates.…”

Section: Introductionmentioning

confidence: 99%

Preparation of a Porous Geopolymer (SPG) to be Used as an Adsorbent for Cu²⁺ Removal

Sang,

Zhao,

et al. 2024

Langmuir

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A porous geopolymer was synthesized using steel slag (accounting for 71.6 wt %) with the aim of effectively removing Cu 2+ ions. The chemical composition and microstructure of this material were investigated using X-ray diffraction spectroscopy, Fourier transform infrared spectroscopy, scanning electron microscope analysis, and BET method. The effects of H 2 O 2 doping, H 2 O doping, and the curing temperature on the properties of this porous geopolymer were systematically investigated. Subsequently, the adsorption behavior of the porous geopolymer toward Cu 2+ was explored through static adsorption experiments. The findings reveal that there are a higher specific surface area and pore capacity for the porous geopolymer compared to the original steel slag, with a total porosity of 90.3%, compressive strength of 0.29 MPa, and volume water absorption rate of 69.4%. The adsorption capacity of this material toward Cu 2+ is found to be 36.8 mg•g −1 , which is slightly superior to that of commercial spherical 4A molecular sieves. The adsorption process follows the quasi-first-order kinetic model, while the isothermal adsorption conforms to the Freundlich model.

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A review of geopolymer and its adsorption capacity with molecular insights: A promising adsorbent of heavy metal ions

Cited by 31 publications

References 142 publications

Adsorption of Heavy Metals on Alkali-Activated Zeolite Foams

Adsorption of Heavy Metals on Alkali-Activated Zeolite Foams

Diverse material based geopolymer towards heavy metals removal: a review

Preparation of a Porous Geopolymer (SPG) to be Used as an Adsorbent for Cu²⁺ Removal

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A review of geopolymer and its adsorption capacity with molecular insights: A promising adsorbent of heavy metal ions

Cited by 31 publications

References 142 publications

Adsorption of Heavy Metals on Alkali-Activated Zeolite Foams

Adsorption of Heavy Metals on Alkali-Activated Zeolite Foams

Diverse material based geopolymer towards heavy metals removal: a review

Preparation of a Porous Geopolymer (SPG) to be Used as an Adsorbent for Cu2+ Removal

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Preparation of a Porous Geopolymer (SPG) to be Used as an Adsorbent for Cu²⁺ Removal