Tamarind (Tamarindus indica) fruit shell carbon: A calcium-rich promising adsorbent for fluoride removal from groundwater

Fluoride recovery using porous calcium silicate hydrates via spontaneous Ca2+ and OH− release

“…Due to the similar charge and ionic radius of fluoride and hydroxyl ions, the decrease of fluoride recovery in alkaline conditions can is attributed to the competition of hydroxyl ions with fluoride for adsorption sites. In addition, solubility of calcium fluoride increased significantly when pH is higher than 9.0 [20]. The effect of the initial fluoride concentration on the fluoride recovery capacity by P-CSH and C-CSH was studied by keeping all other parameters constant (CSH dosage 6 g/L, contact time 30 min).…”

Biosorption of fluoride on Neem (Azadirachta indica) leaf powder

“…37 Clean and dust free leaves were first sun dried for 3-4 days and then 38 allowed to dry in an air oven at 60-70 C for a long time. The dry 39 leaves was then crushed into fine powder, Neem leaf powder (NLP) 40 using a mechanical grinder. The powder was then sieved and 41 fractionated using a series of sieves and the 74-105 micron fractions 42 were selected.…”

Breakthrough adsorption studies of mixed gases on mango (Mangifera indicaL.) seed shell derived activated carbon extrudes

“…CH 4 and CO 2 are major greenhouse gases 25 contributing to global warming. Though there are many reasons for 26 the cause of global warming, attention was monopolized on 27 greenhouse gases in the recent years due to rise of CO 2 28 (401.53 parts per million in March 2015) concentration in 29 atmosphere at an alarming rate. Q3 30 The control of CO 2 emissions and capture is much attracted in 31 the recent years and efforts have been made for the development 32 of new technology and adsorbent materials.…”

“…61 Though several adsorbents have been developed and studied on 62 bench scale, for onsite application many technological and 63 engineering aspects need to be addressed. 64 The feasibility of bio-carbon as adsorbent in water streams [28] 65 are well studied for the removal of colour [29,30] and hazardous 66 metal [31][32][33]. Adsorption of various gases and volatiles on 67 biomass derived activated carbon was reported [34][35][36][37][38][39][40][41], still many 68 of the biomass derived activated carbon need to be evaluated as 69 potential adsorbent in gas phase.…”