Journal ArticleDOI
Studies on defluoridation of water by coal-based sorbents
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TLDR
In this article, the effect of pH on fluoride removal and the mechanism has also been discussed, as well as the effects of the pH on the removal rate of fluoride from water.Abstract:
Drinking water containing fluoride above a level of 1 mg/dm 3 is considered to be unsafe for human consumption. Higher intake of fluoride can cause potential health hazards. The conventional processes of fluoride removal from water are ion exchange, reverse osmosis and electro-dialysis. However, the utility of these processes has been limited due to their expensive operation and subsequent disposal problem of the waste brine generated. Defluoridation of water samples by coal-based sorbents was studied at different adsorbent dosages. First-order adsorption rate constants using the Lagergren equation, the Freundlich adsorption isotherm, the Langmuir adsorption isotherm, film diffusion and pore diffusion coefficients have been evaluated for each system. The effect of pH on fluoride removal and the mechanism has also been discussed.read more
Citations
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Single- and multi-component adsorption of cadmium and zinc using activated carbon derived from bagasse--an agricultural waste.
Dinesh Mohan,Kunwar P. Singh +1 more
TL;DR: Activated carbon derived from bagasse, an agricultural waste material, has been investigated as a replacement for the current expensive methods of removing heavy metals from wastewater and it was concluded that the adsorption occurs through a film diffusion mechanism at low as well as at higher concentrations.
Journal ArticleDOI
Fluoride removal from water by adsorption—A review
TL;DR: Fluoride contamination in drinking water due to natural and anthropogenic activities has been recognized as one of the major problems worldwide imposing a serious threat to human health as mentioned in this paper, and it has been identified as a major problem worldwide.
Journal ArticleDOI
Adsorption of fluoride from aqueous solution by acid treated spent bleaching earth
TL;DR: In this paper, the effect of the adsorbent concentration on the adsorption was studied and the dependence of the adaption of fluoride on the pH of the solution has been studied to achieve the optimum pH-value.
Journal ArticleDOI
Adsorption of fluoride in aqueous solutions using KMnO4-modified activated carbon derived from steam pyrolysis of rice straw.
TL;DR: Fluoride in drinking water above permissible levels is responsible for human and skeletal fluorosis and activated carbons prepared by one-step steam pyrolysis of rice straw were modified by liquid-phase oxidation using HNO3, H2O2 and KMnO4.
Journal ArticleDOI
Removal of Hexavalent Chromium from Aqueous Solution Using Low-Cost Activated Carbons Derived from Agricultural Waste Materials and Activated Carbon Fabric Cloth
TL;DR: In this paper, a variety of low-cost activated carbons were developed from agricultural waste materials, characterized, and utilized for the removal of hexavalent chromium from wastewater.
References
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Journal ArticleDOI
Removal of Cadmium (II) by Low Cost Adsorbents
TL;DR: In this article, Giridih coal and crushed coconut shell were investigated in batch experiments after eliminating other sorbents in the initial screening tests, and they were found to adsorb cadmium from solution.
Journal ArticleDOI
Kinetics of mercury adsorption from wastewater using activated carbon derived from fertilizer waste
TL;DR: In this article, the effect of pH, temperature, initial absorbate concentration, particle size of the adsorbent and solid to liquid ratio on the kinetics of adsorption was delineated.
Journal ArticleDOI
Natural zeolite utilisation in pollution control: A review of applications to metals' effluents
TL;DR: In this paper, the potential of natural zeolite utilization as a low-cost ion exchange and sorbent material in pollution control and recovery of metals is assessed and the extent of application is unlikely to be related solely to their low cost, but also to improved properties and performance characteristics.
Journal ArticleDOI
A study on removal of fluorides from drinking water by adsorption onto low-cost materials.
TL;DR: Present study has indicated that materials like nirmali seeds and lignite are not effective (removal 6 to 8%); whereas removal by kaolinite clay was slightly higher (18.2%) than that of charfines and bentonite at optimum system conditions.
Journal ArticleDOI
Defluoridation of water by adsorption on fly ash
TL;DR: In this article, the ability of fly ash to remove fluoride from water and wastewaters has been studied at different concentrations, times, temperatures and pH of the solution, and the rate constants of adsorption, intraparticle transport, mass transfer coefficients and thermodynamic parameters have been calculated at 30, 40, and 50 °C.
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