Development of novel geopolymeric foam composites coated with polylactic acid to remove heavy metals from contaminated water

Ramos, Flávio James Humberto Tommasini Vieira; Marques, Maria de Fátima Vieira; Rodrigues, João Gabriel Passos; Aguiar, Vinícius de Oliveira; Luz, Fernanda Santos da; Azevedo, Afonso Rangel Garcez de; Monteiro, Sérgio Neves

doi:10.1016/j.cscm.2021.e00795

Cited by 12 publications

(3 citation statements)

References 45 publications

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“…Depending on their composition and preparation method, AAMs can exhibit low environmental footprint, cation exchange capacity, high water permeability, and mesoporous structure. − Highly porous alkali-activated foams (AAFs) can be fabricated using the direct foaming method, where a blowing agent (such as H 2 O 2 ) and a surfactant are added to fresh-state paste, resulting in pore structure formation. Although the application of AAFs to wastewater treatment as adsorbents has been widely studied, − their application to water disinfection has received less attention. Antimicrobial properties can be introduced to AAMs, for example, by the ion exchange of charge-balancing cations (e.g., Na + ) with Ag + .…”

Section: Introductionmentioning

confidence: 99%

Alkali-Activated Foams Coated with Colloidal Ag for Point-of-Use Water Disinfection

Bhuyan,

Karkman,

Prokkola

et al. 2024

ACS EST Water

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Alkali-activated foams are ceramic-like materials prepared at near-ambient temperature. This study investigates them for point-of-use water disinfection, thus providing an alternative to ceramic filters fired at a high temperature. Alkali-activated foams with different compositions were characterized for the porosity, mechanical strength, shrinkage, and microstructure. The optimized foam, employing metakaolin as the raw material, was coated with a colloidal Ag solution. The disinfection performance and leaching behavior of the foams was followed in a continuous 10 week experiment, where clean water with a weekly pulse of contaminated water was distributed through the foam. The average inactivation of Escherichia coli with the Ag-coated foam was 2.84 log10, which was 1.27 units higher compared to foam without Ag. A quantitative polymerase chain reaction analysis and metagenomic sequencing verified that foams with and without Ag were both capable of reducing the microbial load. Furthermore, the changes induced by the foam with Ag on the microbial community composition, antibiotic resistome, and metal and biocide resistomes were significant. The leached concentrations of Ag, Na, Si, and Al were in accordance with the drinking water guidelines. Finally, a life cycle assessment indicated the possibility of reducing the global warming potential and the total embodied energy in comparison with a conventional ceramic filter.

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Section: Introductionmentioning

confidence: 99%

Alkali-Activated Foams Coated with Colloidal Ag for Point-of-Use Water Disinfection

Bhuyan,

Karkman,

Prokkola

et al. 2024

ACS EST Water

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“…The alkali activation process is considered one of the main anticipated techniques and has a high value in the sustainable consumption of solid wastes. In recent years, foamed materials have gained increased attention in water remediation due to their high thermal stability and porous structure [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 ]. Numerous studied focused on utilizing alkali-activated foamed materials for the removal of contaminants from water [ 23 , 24 , 25 ].…”

Section: Introductionmentioning

confidence: 99%

Utilization of Foamed Glass as an Effective Adsorbent for Methylene Blue: Insights into Physicochemical Properties and Theoretical Treatment

et al. 2023

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This study reports a potential approach for the valorization of glass waste (GW) that is mainly composed of amorphous silica to prepare lightweight foamed glass (FG). The preparation of FG was achieved by mixing sodium hydroxide with GW powder followed by sintering at a temperature of 800 °C. As-synthesized FG was characterized and applied as an effective adsorbent for the removal of hazardous organic water contaminants, in particular, methylene blue (MB) dye. FG exhibited porosity of 91%, bulk density of 0.65 g/cm3, compressive strength of 4 MPa, and thermal conductivity of 0.27 W/m·K. Theoretical treatment indicated that a monolayer model with one energy site was the best in fitting the removal of MB molecules. The number of MB molecules per active site (n) ranged from 2.20 to 1.70, suggesting vertical orientation and a multi-molecular adsorption mechanism. The density of FG receptor sites (DM) increased with the temperature, and this parameter played a vital role in the adsorption process. The adsorption capacity (Qsat) increased from 255.11 to 305.58 mg/g, which signifies endothermic interactions. MB adsorption on FG was controlled by physical forces such as electrostatic interactions (i.e., the adsorption energies were <20 kJ/mol). The results of this study prove the feasibility of glass waste as an effective and low-cost adsorbent for water remediation.

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“…There are many studies using adsorbent materials to treat different types of waste, such as heavy metals [ 32 , 33 ], antibiotics [ 34 ], inorganic, and organic compounds [ 35 ], in which the use of various types of adsorbents, such as agricultural wastes [ 36 , 37 ], industrial waste [ 38 , 39 ], environmental pollutants, such as fly ash [ 40 , 41 ], peat [ 42 , 43 ], blast furnace slag [ 44 , 45 ], and graphite materials [ 46 ], has been considered. However, in recent years, the use of adsorbent materials from the sea has been focused on due to treatment efficiency as well as solving environmental problems [ 47 ].…”

Section: Introductionmentioning

confidence: 99%

A Critical Review of Snail Shell Material Modification for Applications in Wastewater Treatment

2023

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Sea material is becoming increasingly popular and widely used as an adsorbent in wastewater treatment. Snail shell, a low-cost and natural animal waste material, has been shown to have a high calcium content (>99%) and a large potential surface area for the development of sustainable adsorbents. This paper presents a novel synthesis of methods for using snail shell absorbent materials in the treatment of wastewater containing heavy metals, textile dyes, and other organic substances. Modified biochar made from snail shells has gained popularity in recent years due to its numerous benefits. This paper discusses and analyzes modification methods, including impregnating with supplements, combining other adsorbents, synthesis of hydroxyapatite, co-precipitation, and the sol–gel method. The analysis of factors influencing adsorption efficiency revealed that pH, contact time, temperature, initial concentration, and adsorbent dose all have a significant impact on the adsorption process. Future research directions are also discussed in this paper as a result of presenting challenges for current snail adsorbents.

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Development of novel geopolymeric foam composites coated with polylactic acid to remove heavy metals from contaminated water

Cited by 12 publications

References 45 publications

Alkali-Activated Foams Coated with Colloidal Ag for Point-of-Use Water Disinfection

Alkali-Activated Foams Coated with Colloidal Ag for Point-of-Use Water Disinfection

Utilization of Foamed Glass as an Effective Adsorbent for Methylene Blue: Insights into Physicochemical Properties and Theoretical Treatment

A Critical Review of Snail Shell Material Modification for Applications in Wastewater Treatment

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