Studies on Defluoridation of Water by Tea Ash:An Unconventional Biosorbent

Abstract

Abstract:Residual part of tea as a household waste was effectively used for removal of fluoride from aqueous medium. The variable operating parameters such as pH, initial fluoride concentration, sorbent particle size, agitation time and temperature. The defluoridation capacity increases with increasing adsorbent dose and contact time but decrease with initial concentration of fluoride solution. Moreover, acidic pH (6) showed the highest removal of fluoride. Further defluoridation follows second order kinetics and Langmuir and Freundlich adsorption isotherm. The surface and sorption characteristics were analyzed using FTIR and SEM techniques. For domestic and industrial applications, defluoridation with 100% achievement and subsequent regeneration of adsorbent was performed with a household water filter and fixed bed column respectively.

The Influence of Stereochemistry of the Active Compounds on Fluoride Adsorption Efficiency of the Plant Biomass

“…Similar trends were observed by Yadav et al [12] and Mondal et al [28]. This is attributable to the increased concentration gradient between the liquid and the solid phases which increasingly exceeds the mass transfer resistance between the solution and the biomass [12].…”

Optimizing adsorption of fluoride from water by modified banana peel dust using response surface modelling approach

“…solution (extracted from eggshell). The pH effect on fluoride removal is similar to what is observed for fluoride adsorption onto various adsorbents such as laterite (Gomoro et al 2012), rice husk (Mondal et al 2012b) and tea residue ash (Mondal et al 2012a). Bearing in mind, that for The latter mechanism could also explain the fluoride adsorption capacity in a neutral medium (Eq.…”

“…Many natural adsorbent materials were tried in the past to find out efficient and economically viable defluoridating agents such as activated alumina (Ghorai and Pant 2005), alumina-gibbsite (Mariappan et al 2003), activated carbon (Karthikeyan and Ilango 2007), calcite (Turner et al 2010), clay (Coetzee et al 2003), zeolite (Díaz-Nava et al 2007), activated charcoal (Daifullah et al 2007), bleaching earth (Mahramanlioglu et al 2002), red mud (Tor et al 2009), brick powder (Yadav et al 2006), sugarcane charcoal , waste tea ash (Mondal et al 2012a) and rice husk ash (Mondal et al 2012b).…”

Removal of fluoride by aluminum impregnated coconut fiber from synthetic fluoride solution and natural water

“…Literature has reported various adsorbents for defluoridation such as egg cell dust, sugarcane rice husk ash, tea ash, leaf biomass, algal biomass, sugarcane baggies charcoal, bio-char, etc [18][19][20]16,21,22].…”