title: Physicochemical characterization and adsorption behavior of Ca/Al chloride hydrotalcite-like compound towards removal of nitrate.
abstract: The objective of the present research was to synthesize, characterize and to investigate adsorption of nitrate from synthetic nitrate solution by Ca-Al-Cl HTlc. In the present study Ca-Al-Cl HTlc was synthesized by co-precipitation method and was characterized using SEM, XRD, FTIR and TGA-DSC. To assess the practical usefulness, a detailed removal study of nitrate was carried out. The removal of nitrate was 84.6% under neutral condition using 0.35 g of adsorbent in 100mL of nitrate solution having initial concentration of 10mg/L. Adsorption kinetic study revealed that the adsorption process followed first order kinetics. Adsorption data were fitted to linearly transformed Langmuir adsorption isotherm with R(2) (correlation coefficient)>0.99. Thermodynamic parameters were also calculated to study the effect of temperature on the removal process. In order to understand the adsorption type, equilibrium data were tested with Dubinin-Radushkevich isotherm.
authors.affiliation: Department of Chemistry, Purushottam Institute of Engineering & Technology, Purushottam Vihar, 10th km, Highway - 10, Mandiakudar, Kansbahal, Rourkela 770034, Orissa, India. mahamudur.islam@gmail.com
authors.forename: Mahamudur
authors.initials: M
authors.lastname: Islam
authors.forename: Rajkishore
authors.initials: R
authors.lastname: Patel
mesh_terms: D000327:Adsorption; D000077410:Aluminum Chloride; D017607:Aluminum Compounds / Q000737:chemistry; D000536:Aluminum Hydroxide / Q000737:chemistry*; D002122:Calcium Chloride / Q000737:chemistry; D011232:Chemical Precipitation; D002712:Chlorides / Q000737:chemistry; D008276:Magnesium Hydroxide / Q000737:chemistry*; D009566:Nitrates / Q000302:isolation & purification*; D013816:Thermodynamics; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
chemical_list: D017607:Aluminum Compounds; D002712:Chlorides; D009566:Nitrates; D014874:Water Pollutants, Chemical; C010467:hydrotalcite; D000077410:Aluminum Chloride; D000536:Aluminum Hydroxide; D002122:Calcium Chloride; D008276:Magnesium Hydroxide