Synthesis and physicochemical characterization of MnO2 coated Na-bentonite for groundwater defluoridation: Adsorption modelling and mechanistic aspect.

Mudzielwana, Rabelani; Gitari, Wilson M.; Akinyemi, Segun A.; Msagati, Titus A.M.

doi:10.1016/j.apsusc.2017.05.194

Cited by 29 publications

(13 citation statements)

References 20 publications

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“…Kadeche et al 62 reported that the Na-bentonite had a sharp-edged lamellar structure. Some studies revealed that the bentonite was granular with an irregular structure, 63 which was consistent with the as-prepared Na-bentonite, as shown in Fig. 3a .…”

Section: Resultssupporting

confidence: 79%

Hydrocracking of crude palm oil to a biofuel using zirconium nitride and zirconium phosphide-modified bentonite

et al. 2022

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Section: Resultssupporting

confidence: 79%

Hydrocracking of crude palm oil to a biofuel using zirconium nitride and zirconium phosphide-modified bentonite

et al. 2022

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“…Adsorption-based techniques are often preferred since they use easily sourced materials, such as clay soils [ 7 ], agricultural wastes [ 8 ], diatomaceous earth [ 9 ], red mud [ 10 ], activated carbon [ 11 ] and fly ash [ 12 ]. Agricultural wastes, such as macadamia nut shells (MNS), consist mainly of cross-linked polymeric chains, such as lignin, cellulose and hemicellulose, with chemically active functional groups that enables them to adsorb various pollutants from water via ion exchange and surface complexation mechanisms [ 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Fluoride Bio-Sorption Efficiency and Antimicrobial Potency of Macadamia Nut Shells

et al. 2022

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This paper presents the potential application of macadamia nut shells (MNS) in the bio-sorption of fluoride and its antimicrobial potency against common pathogens encountered in surface water resources. The efficiency of MNS in the sorption of fluoride was determined using batch mode experiments, while the antimicrobial potency was investigated using the well disc diffusion assay method. The maximum fluoride sorption capacity of 1.26 mg/g was recorded at an initial fluoride concentration of 5 mg/L, adsorbent dosage of 0.5 g/100 mL, contact time of 120 min and initial pH of 6. The adsorption kinetics data were better described with a pseudo second order model, indicating the dominance of the chemisorption mechanisms. The Langmuir adsorption isotherm model described the isotherm data suggesting a monolayered adsorption. The thermodynamic parameters, ∆Gº and ∆Hº, confirmed that F− sorption by MNS is a spontaneous and endothermic process. The bio-sorbent was regenerated for seven continuous cycles when HCl was used as regenerating solution. The antimicrobial studies revealed that MNS has minimal activity towards Escherichia coli, Staphylococcus aureus and Klebsiella pneumoniae. The MNS showed potentials for application in bio-sorption of fluoride. However, the doping of MNS with metal ions is recommended to enhance its anti-microbial potency.

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“…General mechanism involved for arsenic and fluoride removal using clay mineral can be summarized by the following three main steps: (i) Mass transfer of ions to the external of the adsorbent, (ii) adsorption of ions on the external particle surface and (iii) Intra-particle diffusion of ions from the exterior surface and the exterior surface and possible exchange with elements on the pore surface inside particles [30,43]. These major three steps were observed during the adsorption of fluoride onto MnO 2 coated bentonite by Mudzielwana et al, [44]. Besides these NB: (−) = not reported.…”

Section: Mechanisms For Arsenic and Fluoride Removal Using Clay Soilsmentioning

confidence: 98%

Mineralogical and Chemical Characteristics of Raw and Modified Clays and Their Application in Arsenic and Fluoride Removal: Review

Gitari¹,

Mudzielwana²

2018

Current Topics in the Utilization of Clay in Industrial and Medical Applications

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Clay and clay minerals have always been used since the ancient times for making ceramic materials and also as a building material. Over the past decades, there has been a growing trend in their applicability in different areas such as industries, environmental remediation and water treatment sectors. The growing trend is mainly associated with the fact that they are chemically and mechanically stable, have higher specific surface area and cation exchange capacity. Furthermore, clays can be modified to improve their functionalities in different sectors. In this chapter, we present a review of the structural, mineralogical and chemical properties of clay and the effect of surface modification in their structures. We further looked at their applicability in arsenic and fluoride removal in their raw and also in their modified form. Although the literature showed that modified clay minerals yields higher adsorption capacity as compared to raw clays little nothing has been reported yet in relation to the cost of modifying clays with chemical species. As such new studies should also elaborate on the cost effectiveness of modifying clay minerals with chemical species.

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Synthesis and physicochemical characterization of MnO2 coated Na-bentonite for groundwater defluoridation: Adsorption modelling and mechanistic aspect.

Cited by 29 publications

References 20 publications

Hydrocracking of crude palm oil to a biofuel using zirconium nitride and zirconium phosphide-modified bentonite

Hydrocracking of crude palm oil to a biofuel using zirconium nitride and zirconium phosphide-modified bentonite

Fluoride Bio-Sorption Efficiency and Antimicrobial Potency of Macadamia Nut Shells

Mineralogical and Chemical Characteristics of Raw and Modified Clays and Their Application in Arsenic and Fluoride Removal: Review

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