Studies on defluoridation of water by Tamarind seed, an unconventional biosorbent

Abstract

Tamarind seed, a household waste from the kitchen is used for the sorptive removal of fluoride from synthetic aqueous solution as well as from field water samples. Batch sorptive defluoridation was conducted under variable experimental conditions such as pH, agitation time, initial fluoride concentration, particle size and sorbent dose. Maximum defluoridation was achieved at pH 7.0. Defluoridation capacity decreases with increase in temperature and particle size. Further, defluoridation follows first order kinetics and Langmuir adsorption isotherm. Desorption was carried out with 0.1 N HCl and is 90 per cent. The surface and sorption characteristics were analysed using FTIR and SEM techniques. All these results indicate the involvement of energetic forces such as coulombic interaction in sorption. 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.

Defluoridation of water by activated carbon prepared from banana (Musa paradisiaca) peel and coffee (Coffea arabica) husk

“…In the literature, defluoridation was studied using different biosorbents such as Cynodon dactylon-based activated carbon (Alagumuthu et al 2011), thermally activated carbon prepared from neem (Azadirachta indica) and kikar (Acacia arabica) leaves (Kumar et al 2008), carbonaceous adsorbents such as wood charcoal or bone charcoal, coconut coir or animal bones (Sivasamy et al 2001), metal ions impregnated activated charcoal (Janardhana et al 2006), activated charcoal prepared from wheat husk-and alum-treated fly ash (Singh et al 2000), bone charcoal, peels of Citrus documana, Citrus medica, and Citrus aurantifolia fruits-based activated carbon (Chakrapani et al 2010), Moringa indica bark, chitin/cellulose composite (Jayapriya et al 2011), chitosan-coated silica (Vijaya andKrishnaiah 2009), corn cobs (Hemant et al 2006), rice husk (Waheed et al 2009), tamarind seed and Moringa indica-based activated carbon (Murugan and Subramanian 2006;Karthikeyan and Ilango 2007), and bone meal (Gao et al 2009). So far, no report was found in the literature regarding utilization of banana peel and coffee husk for defluoridation.…”

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

“…Fluoride is one of the most potent groundwater pollutant 1 . Excess intake (>1.5 mgL -1 ) may cause fluorosis (dental, skeletal and non-skeletal) along with various neurological complication.…”

Eco-friendly treatment of textile dye from aqueous solution using encapsulated biosorbent matrix beads: kinetics and breakthrough analysis

“…The values of K Fr and n can be determined by plotting ln q e versus ln C e resulting in a straight line with a slope of n and an intercept of ln K Fr . A higher value of K Fr estimates provide higher affinity toward the ions and the value of 1/n lies between 0.1 \ 1/n \ 1 representing favorable biosorption [20]. The detailed parameters of Langmuir and Freundlich isotherm equations are listed in Table 3.…”