Batch defluoridation appraisal of aluminium oxide infused diatomaceous earth

Oladoja, N.A.; Helmreich, Brigitte

doi:10.1016/j.cej.2014.07.070

Cited by 29 publications

(11 citation statements)

References 42 publications

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“…The reduction in the defluoridation efficiency of the thermally treated laterite samples was ascribed to the transformation of the metal constituents of the laterite sample into more crystalline phase and loss of surface hydroxyl groups which is not favorable for fluoride adsorption . Similar observation was reported when the role of heat treatment on the defluoridation efficiency of aluminum oxide infused diatomaceous earth was investigated.…”

Section: Resultssupporting

confidence: 72%

“…Chemically, quartz is made up of SiO 2 , which is the same chemical species that is found in diatomaceous earth. In our previous study, diatomaceous earth, the chemical analogue of quartz showed very poor affinity for aqua F − species .…”

Section: Resultsmentioning

confidence: 83%

“…The only difference observed was the enhanced transmittance values of the peaks observed in the FLT 0 relative to the virgin LT 0 . The absence of diagnostic peak on F − laden adsorbent has been reported in the batch defluoridation appraisal of aluminum oxide infused diatomaceous earth [26]. This observation was attributed to the fact that fluoride is a light atom and has little vibration information or adsorption response, thereby creating difficulty in the use of FTIR spectroscopy to provide detailed chemical information of adsorbed F − on adsorbents [57,58].…”

Section: Characterization Of the Fluoride Laden Ltmentioning

confidence: 99%

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Insight into the defluoridation efficiency of lateritic soil

Oladoja

Bello

Obisesan

et al. 2018

Env Prog and Sustain Energy

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The need to explicate the mechanisms that underlies the defluoridation of potable water using lateritic soil necessitated this study. Raw laterite sample was thermally treated at varying temperatures that ranged between 100 °C and 1000 °C to determine the effects of thermal treatment on the surficial features and the defluoridation efficiency. The influence of hydrochemistry (i.e., pH, ionic strength, and anionic interference) on the defluoridation efficiency of the lateritic soil was studied. The determination of the effects of thermal treatment on the performance efficiency of the laterites sample showed that the presence of surface hydroxyl group enhanced the defluoridation efficiency. The kinetic analysis of the process showed that the pseudo‐second‐order kinetic equation gave the best description of the process. The evaluation of the influence of ionic strength on the defluoridation efficiency showed that the interaction between the LT0 and the aqua phase F− occurred via inner sphere complex formation. The assessment of the impact of the initial F− solution pH value on the process showed that the possible mode of interaction between the LT0 and the aqua phase F− include electrostatic attraction, ligand exchange, and H‐ bonding. The evaluation of anionic (NO3−, Cl− PO43−, CO32−, and SO42−) interference on the process showed that the mode of interaction between the LT0 and the F− occurred via specific adsorption. Laterite can be effectively used in aqua defluoridation, except where the presence of specific interfering ionic species are abundant. © 2018 American Institute of Chemical Engineers Environ Prog, 38:e13107, 2019

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Section: Resultssupporting

confidence: 72%

Section: Resultsmentioning

confidence: 83%

Section: Characterization Of the Fluoride Laden Ltmentioning

confidence: 99%

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Insight into the defluoridation efficiency of lateritic soil

Oladoja

Bello

Obisesan

et al. 2018

Env Prog and Sustain Energy

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“…The model is widely used to describe liquid-solid phase adsorption systems, and it is the earliest known kinetic model describing the adsorption rate based on the adsorption capacity. 24 log(q e -q t )=log(q e )-k ad t…”

Section: Adsorption Kineticsmentioning

confidence: 99%

Characterisation of smectite-rich clay soil: Implication for groundwater defluoridation

Mudzielwana¹,

Gitari²,

Msagati³

2016

S. Afr. J. Sci.

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Groundwater is a widely used and affordable source of drinking water in most of the rural areas of South Africa. Several studies have indicated that groundwater in some boreholes in South Africa has a fluoride concentration above the level recommended by the World Health Organization (1.5 mg/L). Fluoride concentrations above the permissible limit (>1.5 mg/L) lead to dental fluorosis, with even higher concentrations leading to skeletal fluorosis. In the present work, we evaluate the application of smectite-rich clay soil from Mukondeni (Limpopo Province, South Africa) in defluoridation of groundwater. The clay soil was characterised by mineralogy using X-ray diffraction, by elemental composition using X-ray fluorescence and by morphology using scanning electron microscopy. Surface area and pore volume was determined by the Brunauer–Emmett–Teller surface analysis method. Cation exchange capacity and pHpzc of the soil were also evaluated using standard laboratory methods. Batch experiments were conducted to evaluate and optimise various operational parameters such as contact time, adsorbent dose, pH and initial adsorbate concentration. It was observed that 0.8 g/100 mL of smectite-rich clay soil removed up to 92% of fluoride from the initial concentration of 3 mg/L at a pH of 2 with a contact time of 30 min. The experimental data fitted well to a Langmuir adsorption isotherm and followed pseudo second order reaction kinetics. Smectite-rich clay soil showed 52% fluoride removal from field groundwater with an initial fluoride concentration of 5.4 mg/L at an initial pH of 2 and 44% removal at a natural pH of 7.8. Therefore smectite-rich clay soil from Mukondeni has potential for application in defluoridation of groundwater. Chemical modification is recommended to improve the defluoridation capacity.

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“…simplicity and low cost), a number of promising adsorbents (e.g. calcium chloride modified zeolite [1], Fe(III) modified natural stilbite zeolite [2], chitosan based microporous alumina [3] and magnesia-loaded fly ash cenospheres [4] aluminum infused diatomaceous earth [5]) have been previously investigated for defluoridation of contaminated water. Among the list of sorbents studied, metal (oxides and hydroxides) rich materials have exhibited high potential in defluoridation.…”

Section: Introductionmentioning

confidence: 99%