Preparation of alkali-activated fly ash-based geopolymer and their application in the adsorption of copper (II) and zinc (II) ions

Darmayanti, Lita; Notodarmojo, Suprihanto; Damanhuri, Enri; Kadja, Grandprix T.M.; Mukti, Rino R.

doi:10.1051/matecconf/201927606012

Cited by 11 publications

(5 citation statements)

References 41 publications

(44 reference statements)

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“…Another characteristic band for leca and FA samples ( Figure S5 ) appeared at 572 cm –1 and a shoulder peak at 730 cm –1 that could correspond to Fe–O and Al–OH groups. 30 − 32 The latter disappeared after silica shell coverage and instead a new band appeared for all three samples at 960 cm –1 that corresponded to Si–OH vibrations. 33 …”

Section: Resultsmentioning

confidence: 92%

“…All three samples had characteristic peaks of SiO 2 around 460, 800, and 1085 cm –1 , corresponding to δ(Si–O–Si), υ(Si–O–Si), and υ as (Si–O–Si) vibrations , (Figure a, Figure S5). Another characteristic band for leca and FA samples (Figure S5) appeared at 572 cm –1 and a shoulder peak at 730 cm –1 that could correspond to Fe–O and Al–OH groups. − The latter disappeared after silica shell coverage and instead a new band appeared for all three samples at 960 cm –1 that corresponded to Si–OH vibrations …”

Section: Resultsmentioning

confidence: 97%

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Natural Silicates Encapsulated Enzymes as Green Biocatalysts for Degradation of Pharmaceuticals

Vardanyan,

Agback,

Golovko

et al. 2024

ACS EST Water

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Biocatalytic degradation with the use of enzymes has gained great attention in the past few years due to its advantages of high efficiency and environmental friendliness. Novel, cost-effective, and green nanoadsorbents were produced in this study, using natural silicates as an enzyme host matrix for core−shell immobilization technique. With the natural silicate as a core and silica layer as a shell, it was possible to encapsulate two different enzymes: horseradish peroxidase (HRP) and laccase, for removal and degradation of three pharmaceuticals: diclofenac (DFC), carbamazepine (CBZ), and paracetamol (PC). The biocatalysts demonstrated high oxidation rates for the selected pollutants. In particular HRP immobilized fly ash and perlite degraded DFC and PC completely during 3 days of interaction and also showed high degradation rates for CBZ. Immobilized laccase was successful in PC degradation, where up to 70−80% degradation of the compounds with aromatic rings was reported by NMR measurements for a high drug concentration of 10 μg/mL. The immobilization method played a significant role in this process by providing stability and protection for the enzymes over 3 weeks. Furthermore, the enzymes acted differently in the three chosen supports due to their complex chemical composition, which could have an effect on the overall enzyme activity.

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Section: Resultsmentioning

confidence: 92%

Section: Resultsmentioning

confidence: 97%

Natural Silicates Encapsulated Enzymes as Green Biocatalysts for Degradation of Pharmaceuticals

Vardanyan,

Agback,

Golovko

et al. 2024

ACS EST Water

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“…The stretching and deformation vibrations of the OH group are responsible for the large peak at 3306 cm −1 in the unsintered membrane. [ 32 ]…”

Section: Resultsmentioning

confidence: 99%

Porous cenosphere ceramic microfiltration membrane: Preparation, characterization, permeability evaluation, and cost estimation

Pradhan,

Rathod,

Rai

et al. 2023

Can J Chem Eng

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Ceramic membranes are now receiving greater attention and are regarded as the best alternative option for reducing energy use. There are currently a number of limitations on the use of ceramic membranes, including high raw material costs and high sintering temperatures during synthesis. Cost‐effective raw materials were employed in the synthesis of ceramic membranes to get around these restrictions. Utilizing a straightforward pressing technique, circular disc‐type membranes were prepared. To assess the membrane properties, the impact of sintering temperatures between 700 and 900°C was examined. By varying the sintering temperature, the average membrane pore diameter was observed. The membrane, which was sintered at 800°C, had pores that were on average 110 nm in size. Furthermore, the porosity of these synthesized membranes ranged from 22% to 35% with an average pore diameter of 74–121 nm. These manufactured membranes showed very good chemical stability when both acidic and basic solutions were used. Various characterization methods, including thermogravimetric analysis (TGA), x‐ray diffraction analysis (XRD), and scanning electron microscopy (SEM), were used. Thermo‐gravimetric investigation revealed that the synthesized cenosphere membrane required a minimum sintering temperature of about 700°C. The flux measured with deionized water and the applied transmembrane pressure showed an upward trend. The impact of sintering temperature on permeate flux was investigated. The results showed that as the sintering temperature increased from 700°C to 900°C, the flux reduced. It was determined that the synthesized membrane cost ₹1618.80/m2.

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“…Therefore, the reaction mechanisms of geopolymer-based S/S of Zn can be summarized as physical encapsulation and electrostatic adsorption [ 99 ]. On the other hand, compared to the solidification of Zn using geopolymer, there are more reports about the adsorption of Zn 2+ using geopolymer-based adsorbents, such as natural volcanic tuff-based geopolymers [ 100 ], metakaolin-based geopolymers [ 101 ], fly-ash-based geopolymers [ 102 ], hollow gangue microsphere/geopolymer composite [ 93 ], clay-fly-ash-based geopolymer [ 103 ], etc. As a whole, Zn and its compounds possess the properties of amphoteric metal, and the specific associations of Zn in geopolymers should be further explored.…”

Section: Geopolymer-based S/s Processmentioning

confidence: 99%

Application of Geopolymer in Stabilization/Solidification of Hazardous Pollutants: A Review

et al. 2022

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Geopolymers, as a kind of inorganic polymer, possess excellent properties and have been broadly studied for the stabilization/solidification (S/S) of hazardous pollutants. Even though many reviews about geopolymers have been published, the summary of geopolymer-based S/S for various contaminants has not been well conducted. Therefore, the S/S of hazardous pollutants using geopolymers are comprehensively summarized in this review. Geopolymer-based S/S of typical cations, including Pb, Zn, Cd, Cs, Cu, Sr, Ni, etc., were involved and elucidated. The S/S mechanisms for cationic heavy metals were concluded, mainly including physical encapsulation, sorption, precipitation, and bonding with a silicate structure. In addition, compared to cationic ions, geopolymers have a poor immobilization ability on anions due to the repulsive effect between them, presenting a high leaching percentage. However, some anions, such as Se or As oxyanions, have been proved to exist in geopolymers through electrostatic interaction, which provides a direction to enhance the geopolymer-based S/S for anions. Besides, few reports about geopolymer-based S/S of organic pollutants have been published. Furthermore, the adsorbents of geopolymer-based composites designed and studied for the removal of hazardous pollutants from aqueous conditions are also briefly discussed. On the whole, this review will offer insights into geopolymer-based S/S technology. Furthermore, the challenges to geopolymer-based S/S technology outlined in this work are expected to be of direct relevance to the focus of future research.

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Preparation of alkali-activated fly ash-based geopolymer and their application in the adsorption of copper (II) and zinc (II) ions

Cited by 11 publications

References 41 publications

Natural Silicates Encapsulated Enzymes as Green Biocatalysts for Degradation of Pharmaceuticals

Natural Silicates Encapsulated Enzymes as Green Biocatalysts for Degradation of Pharmaceuticals

Porous cenosphere ceramic microfiltration membrane: Preparation, characterization, permeability evaluation, and cost estimation

Application of Geopolymer in Stabilization/Solidification of Hazardous Pollutants: A Review

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