Geopolymer/Zeolite composite materials with adsorptive and photocatalytic properties for dye removal

Pimraksa, Kedsarin; Setthaya, Naruemon; Thala, Maneerat; Chindaprasirt, Prinya; Murayama, Mitsuhiro

doi:10.1371/journal.pone.0241603

Cited by 33 publications

(10 citation statements)

References 44 publications

(43 reference statements)

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“…9 Therefore, to make it viable, use of low-cost adsorbents has been prospected for wastewater remediation. 10 Various mineral systems like zeolites, 11 kaolinite, 12 illite-kaolinite, 13 fly ash, 14 halloysite, 15 sepiolite, 16,17 montmorillonite, 18 and clinoptilolite 19 have been used for dye adsorption. The favorable dye adsorption using these minerals is due to their attributes like high surface area and molecular sieve structure.…”

Section: Introductionmentioning

confidence: 99%

“…20 The mechanism of dye uptake by these aluminosilicate minerals mainly comprises of cation exchange and surface adsorption. 11 However, in their raw or natural form these minerals are not considered suitable for the adsorption of dyes because of their low efficiencies and often used in activated form or as composites. One of the major aluminosilicate requiring environmental management is fly ash.…”

Section: Introductionmentioning

confidence: 99%

“…The favorable dye adsorption using these minerals is due to their attributes like high surface area and molecular sieve structure 20 . The mechanism of dye uptake by these aluminosilicate minerals mainly comprises of cation exchange and surface adsorption 11 . However, in their raw or natural form these minerals are not considered suitable for the adsorption of dyes because of their low efficiencies and often used in activated form or as composites.…”

Section: Introductionmentioning

confidence: 99%

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Effect of temperature and fly ash content on the catalytically pyrolyzed rice straw biochar–fly ash composites for methylene blue adsorption

Bhardwaj

Nag

Hussain

et al. 2022

Asia-Pacific J Chem Eng

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Rice straw and fly ash are the wastes produced in abundance which need immediate attention for their management. In the present study, the in situ pyrolysis of rice straw in presence of fly ash was carried out and the resultant composites were studied for adsorption of methylene blue (MB). Slow pyrolysis of rice straw in presence of fly ash is evaluated using thermogravimetric analysis (TGA) and Coats-Redfern equation for pseudo-first-order reaction kinetics, respectively. The activation energy (E a ) for the pyrolysis of rice straw was 41.75 kJ/mol which was lowered to 37.39 kJ/mol in presence of fly ash. Biochar fly ash composites BFA4 1-3 , BFA5 1-3 , and BFA6 1-3 were prepared at three 400 C, 500 C, and 600 C pyrolysis temperature, respectively, the subscript indicating three different ratios of rice straw and fly ash (1:3, 1:1, and 3:1 w/w ratio). The composites BF4-6 1-3 were neutral to alkaline in pH, due to the presence of basic oxide and carbonates minerals. BFA4-6 1-3 was studied for batch adsorption of MB and optimized for pH, dose, and initial concentration of adsorbate. The maximum MB adsorption capacity of 25.91 mg/g was reported for the composite BFA4 1 . MB adsorption efficiency (q e ) followed the trend BFA4 1-3 > BFA5 1-3 > BFA6 1-3 , which indicates a strong influence of biochar surface functional groups on dye adsorption, as reiterated by the multiple linear regression (MLR) analysis. Stripping of MB was achieved using methanol as a stripping agent for MB-adsorbed BFA4-6 1-3 with desorption efficiency of 7% to 11% in the first cycle and 23% to 100% in the second cycle.Thus, the biochar fly ash composite with optimum ion exchangeable functional organic moieties would be suitable for dye remediation and waste generated in the process could find application in soil amelioration. K E Y W O R D S adsorption-desorption, composite biochar, dye, thermogravimetric analysis Akanksha Bhardwaj and Shilpa Nag have equal contributions to the paper.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of temperature and fly ash content on the catalytically pyrolyzed rice straw biochar–fly ash composites for methylene blue adsorption

Bhardwaj

Nag

Hussain

et al. 2022

Asia-Pacific J Chem Eng

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“…Many studies have reported the ability of geopolymers to entrap solid [ 8 , 60 ] and liquid [ 61 ] wastes inside their 3D structures, proposing new eco-friendly solutions and giving an added value to the wastes without their disposal in the environment. Some authors have focused their research on the entrapment of hazardous macromolecules and organic dyes [ 62 , 63 ]. Following this trend, in our previous study, the feasibility to synthesize metakaolin-based geopolymers cured at 25 and 40 °C in the presence of pH indicators (phenolphtalein, cresol red, methyl orange, and bromothymol blue) [ 22 ] was demonstrated.…”

Section: Discussionmentioning

confidence: 99%

Entrapment of Acridine Orange in Metakaolin-Based Geopolymer: A Feasibility Study

et al. 2023

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Few studies have explored the immobilization of organic macromolecules within the geopolymer matrix, and some have found their chemical instability in the highly alkaline geopolymerization media. The present work reports on the feasibility of encapsulating the potentially toxic acridine orange (AO) dye in a metakaolin based geopolymer while maintaining its structural integrity. The proper structural, chemical, and mechanical stabilities of the final products were ascertained using Fourier-transform infrared (FT-IR) spectroscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric (TGA/DTG), and mechanical analyses, whereas the dye integrity and its stability inside the geopolymer were investigated by the UV-Vis analysis. In addition, the antimicrobial activity was investigated. The FT-IR and XRD analyses confirmed the geopolymerization occurrence, whereas the TGA/DTG and mechanical (compressive and flexural) strength revealed that the addition of 0.31% (AO mg/ sodium silicate L) of AO to the fresh paste did not affect the thermal stability and the mechanical properties (above 6 MPa in flexural strength and above 20 MPa for compressive strength) of the hardened product. UV-Vis spectroscopy revealed that the dye did not undergo chemical degradation nor was it released from the geopolymer matrix. The results reported herein provide a useful approach for the safe removal of toxic macromolecules by means of encapsulation within the geopolymer matrix.

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“…Therefore, there are few studies about the S/S of organic pollutants in geopolymers now. Only several reports were published on the preparation of geopolymer-based photocatalysts, including graphene/fly-ash-based geopolymers [ 190 ], TiO 2 -doped zeolite/geopolymers [ 191 ], Cu (I) oxide, and titanium dioxide/geopolymers [ 192 ], for the degradation of organic pollutants or the adsorbents/membrane, including magnetic geopolymers [ 193 ], defective analcime/geopolymer membranes [ 194 ], geopolymer/alginate [ 195 ], for the removal of organic pollutants from the aqueous conditions.…”

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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Geopolymer/Zeolite composite materials with adsorptive and photocatalytic properties for dye removal

Cited by 33 publications

References 44 publications

Effect of temperature and fly ash content on the catalytically pyrolyzed rice straw biochar–fly ash composites for methylene blue adsorption

Effect of temperature and fly ash content on the catalytically pyrolyzed rice straw biochar–fly ash composites for methylene blue adsorption

Entrapment of Acridine Orange in Metakaolin-Based Geopolymer: A Feasibility Study

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

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