A Review of the Role of Natural Clay Minerals as Effective Adsorbents and an Alternative Source of Minerals

Alshameri, Aref; Xing-hu, Wei; Wang, Hailong; Fuguo, Yang; Chen, Xin; He, Hongping; Yan, Chunjie; Xu, Feng

doi:10.5772/intechopen.87260

Cited by 15 publications

(11 citation statements)

References 75 publications

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“…Among most promising practical methods to achieve this, adsorption has received a great attention due to its simplicity and applicability (Piaskowski et al, 2018;Rafatullah et al, 2010). To date a wide range of materials, such as activated carbons (Alwi et al, 2020;Srivatsav et al, 2020), natural clays (Alshameri et al, 2019), zeolite-based composites (Zamri et al, 2021), and agricultural wastes (Zaidi et al, 2019) have been utilized as adsorbents. In particular, agricultural wastes have several obvious advantages, including their availability in large quantity at low cost, and because their surfaces contain a variety of functional groups (De Gisi et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Acid Blue 25 on Agricultural Wastes: Efficiency, Kinetics, Mechanism, and Regeneration

Samat

Shahri

Abdullah

et al. 2021

Air, Soil and Water Research

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In this study, Acid Blue 25 (AB25), which is a negatively charged synthetic dye was removed from an aqueous solution by adsorption onto agricultural wastes, including banana (BP) and durian (DP) peels. The adsorption performances of AB25 were related to surface characteristics of the agricultural wastes, including their chemical functional groups, net surface charge, surface morphology, surface area, and pore volume. Parameters affecting the adsorption, including contact times, initial concentration, pH, and temperature were investigated. The results revealed that the adsorption of AB25 followed pseudo-second order kinetics, and that the adsorption process was controlled by a combination of intraparticle and film diffusion with a two-step mechanism. The equilibrium data could be simulated by the Langmuir isotherm model, suggesting that AB25 molecules are adsorbed on active sites with a uniform binding energy as a monolayer on the adsorbent surface. The adsorption process was spontaneous and exothermic, and the adsorption capacity decreased with the pH of the medium. The spent adsorbents were best regenerated by acid treatment (pH 2), and could be recycled for several adsorption-desorption processes. Under ambient conditions, the maximum adsorption capacities of AB25 on BP and DP were 70.0 and 89.7 mg g−1, respectively, which is much higher than on a large variety of reported adsorbents derived from other agricultural wastes.

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Section: Introductionmentioning

confidence: 99%

Adsorption of Acid Blue 25 on Agricultural Wastes: Efficiency, Kinetics, Mechanism, and Regeneration

Samat

Shahri

Abdullah

et al. 2021

Air, Soil and Water Research

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“…Clay minerals are an outstanding adsorbent of cationic pollutants and have significant potential as an alternative source of REM. 21 However, further development of clay mineral applications still needs to be studied for achieving the best adsorption and the best extraction of the loaded REM (desorption). 22 Operational parameters such as the masstransfer mechanism and desorption, from the perspective of safety and sustainability, have been neglected in studies that applied clay minerals to adsorb Nd.…”

Section: Introductionmentioning

confidence: 99%

“…Clay minerals are an outstanding adsorbent of cationic pollutants and have significant potential as an alternative source of REM . However, further development of clay mineral applications still needs to be studied for achieving the best adsorption and the best extraction of the loaded REM (desorption) .…”

Section: Introductionmentioning

confidence: 99%

Efficient and Selective Adsorption of Neodymium on Expanded Vermiculite

Brião

Silva

Vieira

2021

Ind. Eng. Chem. Res.

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In this study, expanded vermiculite (EV) was applied to the adsorption of neodymium (Nd) from an aqueous solution with focus on the description of the kinetics and the mechanism of adsorption, determination of the best eluent, and selectivity. The EV was characterized before and after the adsorption process by the morphology, composition, textural properties (specific surface area, density, and porosity), and functional groups. The adsorption experiments showed that under optimal conditions, using 0.7 g of adsorbent and at pH 3.3, the efficiency achieved an enhanced adsorption percentage of 98.7%, which represents an adsorption capacity of 0.205 mmol/g. The external mass and diffusional resistance controlled the mass transfer, and ion exchange occurred mainly with magnesium cations. The proposed mechanism of adsorption was cation exchange in the interlayer region of the vermiculite and the formation of outer-sphere complexes. Calcium chloride was the most suitable eluent, regarding efficiency and low toxicity. The adsorbent preferably adsorbed Nd from a multimetal solution, achieving enhanced values of selectivity. Regarding characterization, the EV presented a well-organized structure, a lamellar morphology, and typical functional groups such as Al–O and Si–O. Thus, the EV adsorbed Nd quickly and efficiently, and the ion-exchange mechanism of adsorption allows the selective adsorption of Nd and safe desorption by the exchange with Ca2+.

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“…The phase composition, structure with large specific surface areas of the fine-sized clays results in distinct properties, which makes them effective properties to remove hazardous metals from the contaminated environments. Nowadays, natural clay minerals act as cost-effective natural scavengers for environmental pollutant remedies [16][17][18][19][20]. Moreover, the naturally deposited inorganic clays and clay minerals are practiced to use for the treatment of bacterial diseases from the earliest recorded history to recent years [21,22].…”

Section: Introductionmentioning

confidence: 99%

Genesis Exploration of White Clays Deposited in Thimi Area of Kathmandu Valley

Dhakal¹,

Duwal²,

Adhikari³

et al. 2021

J. Nepal Chem. Soc.

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The geological genesis of the Thimi-Sanothimi white clay deposits of Kathmandu Valley was explored employing mineralogical and chemical analyses in this research. For the study, two sample specimens of the clay having two types of particle size, i.e., about < 63 µm (bulk) and < 2 µm (fine), were separated with the help of standard sieve mesh which further modified using high-temperature heat, and 1 M HCl and 1 M KCl solution treatments. For the most part, both the clay fractions constituted of 2:1 type of vermiculite and mica (mainly of K-mica type) clay minerals with different feldspars and quartz phases as clay admixtures from the results of the mineralogical phase analysis. The chemical constituents of the clay particles with < 63 µm, < 2 µm, and the HCl-treated sample specimens confirmed the existence of a high quantity of SiO2 with comparatively low Al2O3 which indicates the presence of fewer amounts of the vermiculite and mica minerals comparatively with feldspars and quart admixtures in the analyzed white clay samples. Moreover, the clay sample contained a considerable quantity of Fe2O3 and MgO chemicals which are not favorable raw material constituents for good quality porcelains and white-wares products without refining and chemical-modifications. The present work could be the first step to explore its potentiality in various industrial sectors like table-ware, sanitary-ware, brick and tile ceramics, paper and pulp, petrochemical, pharmaceutical including environmental pollution controlling agents in Nepal.

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A Review of the Role of Natural Clay Minerals as Effective Adsorbents and an Alternative Source of Minerals

Cited by 15 publications

References 75 publications

Adsorption of Acid Blue 25 on Agricultural Wastes: Efficiency, Kinetics, Mechanism, and Regeneration

Adsorption of Acid Blue 25 on Agricultural Wastes: Efficiency, Kinetics, Mechanism, and Regeneration

Efficient and Selective Adsorption of Neodymium on Expanded Vermiculite

Genesis Exploration of White Clays Deposited in Thimi Area of Kathmandu Valley

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