Characterization, adsorption, and electrokinetic properties of modified sepiolite

Beyli, Pınar Turan; Doğan, Mehmet; Alkan, Mahir; Türkyilmaz, Aydın; Turhan, Yasemin; Demirbaş, Özkan; Namlı, Hilmi

doi:10.1080/19443994.2015.1102773

Cited by 9 publications

(1 citation statement)

References 34 publications

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“…Thus, many studies have been conducted to develop low‐cost adsorbents from cheap and readily available materials. Natural clay minerals, such as zeolites [20], kaolinite [21], montmorillonite [22, 23], bentonites [24] and sepiolite [25, 26] etc. have a complex porous structure with high specific surface area, which allow strong physical and chemical interactions with heavy metal ions.…”

Section: Introductionmentioning

confidence: 99%

Removal of heavy metal ions by porous sepiolite‐based membrane

Zhou

Fan

Tian

et al. 2020

Micro & Nano Letters

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Section: Introductionmentioning

confidence: 99%

Removal of heavy metal ions by porous sepiolite‐based membrane

Zhou

Fan

Tian

et al. 2020

Micro & Nano Letters

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Treatment of environmental contamination using sepiolite: current approaches and future potential

Song

Hursthouse

McLellan

et al. 2020

Environ Geochem Health

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To evaluate the potential of sepiolite-based materials to resolve environmental pollution problems, a study is needed which looks at the whole life cycle of material application, including the residual value of material classified as waste from the exploitation of sepiolite deposits in the region or from its processing and purification. This would also maximize value from the exploitation process and provide new potential for local waste management. We review the geographical distribution of sepiolite, its application in the treatment of potentially toxic elements in soil and across the wider landscape, an assessment of modification and compositional variation of sepiolite-based applications within site remediation and wastewater treatment. The potential of sepiolite-based technologies is widespread and a number of processes utilize sepiolite-derived materials. Along with its intrinsic characteristics, both the long-term durability and the cost-effectiveness of the application need to be considered, making it possible to design ready-to-use products with good market acceptance. From a critical analysis of the literature, the most frequently associated terms associated with sepiolite powder are the use of lime and bentonite, while fly ash ranked in the top ten of the most frequently used material with sepiolite. These add improved performance for the inclusion as a soil or wastewater treatment options, alone or applied in combination with other treatment methods. This approach needs an integrated assessment to establish economic viability and environmental performance. Applications are not commonly evaluated from a cost–benefit perspective, in particular in relation to case studies within geographical regions hosting primary sepiolite deposits and wastes that have the potential for beneficial reuse.

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Modelling and Optimization of Sepiolite Activation with Citric Acid Using Factorial Experimental Design and Response Surface Methodology

Yonar

Ugwu

Sabah

2020

Silicon

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In this study, the effects of several parameters such as the acid concentration, mixing time, temperature, solid rate, and mixing rate on the specific surface area (BET) and cation exchange capacity (CEC) of sepiolite activated by citric acid were investigated using factorial experimental design and response surface methodology. While the specific surface area and cation exchange capacity of nitric acid activated sepiolite were chosen as the responses, the acid concentration, time, temperature, solid rate, and mixing rate were the process parameters. The relationship between the process parameters and the responses was obtained and used in the determination of the optimal conditions. The result showed that the specific surface area and cation exchange capacity of the acid-activated sepiolite were strongly affected by the process parameters. The optimal conditions for achieving the maximum specific surface area and minimum cation exchange capacity were 95.73°C, 8.64%, 4.99 N, 1 h, and 450 rpm for temperature, solid rate, acid concentration, activation time, and the mixing rate, respectively. The experimental and predicted values for the S BET and the CEC were obtained as 450.97 m 2 /g and 449.97 m 2 /g, and 6.79 meq/100 g and 6.86 meq/100 g, respectively. The results obtained from this study clearly indicated that the actual values were in good conformity with the predicted values as evidenced by small errors of 1.00% and 0.07% for the S BET and CEC, respectively. As a result, the S BET and CEC of the Sep activated by citric acid were strongly affected by the process parameters, especially the solid rate for the S BET and the temperature for CEC. It was found that citric-acid activated Sep had a S BET approximately 2.5 times higher than that of the untreated Sep while the CEC of Sep may be strongly eliminated by citric acid treatment. Thus, the mineral structure was progressively transformed into amorphous silica coming from the tetrahedral sheet of the generated fibrous silicates, whose S BET was larger than that of the raw Sep.

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Characterization, adsorption, and electrokinetic properties of modified sepiolite

Cited by 9 publications

References 34 publications

Removal of heavy metal ions by porous sepiolite‐based membrane

Removal of heavy metal ions by porous sepiolite‐based membrane

Treatment of environmental contamination using sepiolite: current approaches and future potential

Modelling and Optimization of Sepiolite Activation with Citric Acid Using Factorial Experimental Design and Response Surface Methodology

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