Identification of natural wastes for application in water treatment

Ouafi, Redouane; Raïs, Z.; Taleb, M.

doi:10.5004/dwt.2020.25084

Cited by 3 publications

(8 citation statements)

References 35 publications

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“…e infrared spectra of raw SSP (Figure 2 e double peak at 699.60 cm −1 and 712.33 cm −1 and the peak at 1082.62 cm −1 are characteristic of the aragonite structure. A FTIR spectral detailed analysis of raw SSP was carried out in our previous study [23]. ose results are consistent with previous research [43,44].…”

Section: Ftir Analysissupporting

confidence: 87%

“…According to the results of our previous works, the pHpzc of SSP was found to be 7.97 [23]. erefore, at solution pH lower than 7.97, the surface of SSP is predominated by positive charges and could interact with negative species, while at pH higher than 7.97, the surface of the SSP is predominated by negative charges and could interact with positive metal species.…”

Section: Effect Of Ph Of the Solutionmentioning

confidence: 82%

“…Approximately 44.5% of SSP particles presented size of 300 µm, which represents the largest proportion of the sample (89 g). e particle size distribution curve obtained through the sieve analysis is available in our previous studies [23].…”

Section: Effect Of Particle Sizementioning

confidence: 99%

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Snail Shells Adsorbent for Copper Removal from Aqueous Solutions and the Production of Valuable Compounds

Ouafi

Asri

Omor

et al. 2021

Journal of Chemistry

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This research explored the efficiency of snail shells powder (SSP) for Cu(II) removal from aqueous solutions and the production of valuable compounds from the residual product. To confirm its chemical and mineral components, the material was characterized by different instrumental techniques. The effects of experimental parameters such as the pH of the solution, the effect of SSP dose, particle size, and initial concentration of Cu(II) on the removal process were studied. The removal of Cu(II) was reasonably fast to be completed within a time frame of 90 min. The kinetics following the pseudo-second-order model (R2 = 0.979) were better compared to the pseudo-first-order model (R2 = 0.896). The increase in pH values leads to an increase in the amount of Cu(II) adsorbed. Afterward, the adsorption capacity reaches stability at pH near 7. The maximum Cu(II) removal occurred with a mass of 8 g·L−1 and a particle size of 300 μm. This particle size presents approximately 44.5% of SSP particles, which is the largest proportion of the sample as shown by particle size analysis. The adsorption isotherm was well described by Langmuir and Freundlich equations. The thermodynamic parameters values showed that the Cu(II) adsorption was a spontaneous and exothermic process. Furthermore, with the presence of CaCO3, the precipitation of Cu(II) in the form of posnjakite occurred with a high Cu(II) removal rate close to 99%. The residual SSP was used for the production of valuable compounds through the thermal decomposition process at various temperatures.

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Section: Ftir Analysissupporting

confidence: 87%

Section: Effect Of Ph Of the Solutionmentioning

confidence: 82%

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Snail Shells Adsorbent for Copper Removal from Aqueous Solutions and the Production of Valuable Compounds

Ouafi

Asri

Omor

et al. 2021

Journal of Chemistry

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“…Another study on the combination of snail shell and chestnut using a simple combination method and different ratios of snail shell and chestnut resulted in methylene blue treatment efficiency of up to 92% [ 106 ]. A combination of snail shell and pine cone powder also demonstrated high potential for heavy-metal treatment in wastewater due to the combination of cellulose in an amorphous crystalline phase and calcium carbonate compound [ 115 ].…”

Section: Popular Biochar-modification Methodologies For Snail Shell M...mentioning

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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“…[63][64][65] At pH values below 8.4, the MSW surface is thus largely occupied by positive species such as Ca +2 , CaOH + , and CaHCO 3 + that interact more effectively with anionic while at pH higher than 8.4 negative species such as HCO 3 − and CO 3 −2 dominate the MSW surface enabling effective interaction with cationic dyes. 63,66,67 3.4 Adsorption analysis to 120 min. The removal percentages for both MB and CR were relatively constant past 120 min contact time, suggesting equilibrium being reached.…”

Section: Bet Adsorption Analysis and Pzc Of The Mswmentioning

confidence: 99%

Upcycling of sugar refining mud solid waste as a novel adsorbent for removing methylene blue and Congo red from wastewater

Reda Aly,

El-Demerdash,

Sadik

et al. 2024

RSC Adv.

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Identification of natural wastes for application in water treatment

Cited by 3 publications

References 35 publications

Snail Shells Adsorbent for Copper Removal from Aqueous Solutions and the Production of Valuable Compounds

Snail Shells Adsorbent for Copper Removal from Aqueous Solutions and the Production of Valuable Compounds

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

Upcycling of sugar refining mud solid waste as a novel adsorbent for removing methylene blue and Congo red from wastewater

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