TY - JOUR ID - 88260 TI - Removal of Calcium (Ca2+) Ion from Aqueous Solution by Chemically Activated Thuja Occidentalis Leaves Carbon (CATLC)-Application for Softening the Groundwater Samples JO - Physical Chemistry Research JA - PCR LA - en SN - 2322-5521 AU - Vaddi, Dhilleswararao AU - Subbarao, Mushini Venkata AU - Muralikrishna, M.P.S AD - Department of Chemistry, G M R Institute of Technology, Rajam, Affiliated to JNTUK-Kakinada, 532127, A.P, India AD - Department of Chemistry, Andhra Polytechnic, Kakinada 533003, A.P, India Y1 - 2019 PY - 2019 VL - 7 IS - 3 SP - 449 EP - 466 KW - Ca2+ removal KW - Thuja Occidentalis leaves KW - CATLC KW - FTIR KW - SEM DO - 10.22036/pcr.2019.170974.1590 N2 - In this research paper, chemically activated Thuja Occidentalis leaves carbon (CATLC) is used as an adsorbent for the removal of calcium (Ca2+) ion from aqueous solution. CATLC is prepared and characterized by FTIR, SEM and EDX. The impact of pH, adsorbent dosage, contact period and initial concentration of Ca2+ on the adsorption performance of CATLC for Ca2+ removal are examined by batch studies. The results disclose that CATLC has a high potential to adsorb Ca2+ (91% removal) at pH 7.00. To know the equilibrium behaviour of Ca2+ adsorption, Freundlich and Langmuir models are investigated, and the data discloses that Langmuir model (maximum adsorption capacity ‘Qm’ obtained is of 51.28mg/g and R2= 0.9953) fits better than Freundlich model(R2 =0.8723). The Kinetic studies indicate that pseudo-second-order(R2= 0.9909) is the best fit rather than pseudo-first order, intra particle and Elovich models and chemisorptions are the rate-limiting steps for the Ca2+ adsorption using CATLC adsorbent. Regeneration studies showed that CATLC can be regenerated easily and reused for several adsorption cycles, with sodium chloride solution as a regenerating agent. The application of CATLC adsorbent is useful to reduce the hardness concentration in groundwater samples to meet the allowable limit according to WHO-2011 standards. UR - https://www.physchemres.org/article_88260.html L1 - https://www.physchemres.org/article_88260_3ede06505d2b86e1d04dc8e0c1ee487a.pdf ER -