Synthesis, characterization and phosphate adsorption studies of nano mesoporous lanthanum oxide

• Main Authors: Moothedan, Marymol, Sherly, K. B.
• Format: Conference Proceeding
• Language: English
• Subjects: Adsorbents; Adsorption; Chitosan; Eutrophication; Fourier transforms; Infrared analysis; Infrared spectroscopy; Isotherms; Lanthanum oxides; Quality standards; Reaction time; Surface water; Synthesis; Thermogravimetric analysis; Water management; Water quality
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/5.0217866

The surface water management system is in a search of high efficient nano phosphate adsorbents to prevent eutrophication and to maintain good water quality standards. The chitosan template method was used to synthesize mesoporous lanthanum oxide (La2O3) nanoparticles. The formation, crystalline character, stability, particle size, morphology, and porosity of La2O3 were explored from X-ray diffraction (XRD), Fourier transforms infrared spectroscopy (FT-IR), and Thermogravimetric analysis (TG/DTG), Transmission electron microscopy (TEM) and Braunauer-Emmet-Teller (BET) analysis. The phosphate adsorption capacity of synthesized La2O3 was 266.7 mgg−1. The adsorption of phosphate was found to increase with phosphate concentration and reaction time till equilibrium was attained. The maximum adsorption capacity was obtained for 480 ppm initial phosphate solution with 1 h reaction time. The adsorption isotherm data correlated well with the Redlich-Peterson isotherm model and kinetic data with the Pseudo second-order kinetic model. Nano mesoporous La2O3 after phosphate adsorption was characterized and probable mechanisms for the phosphate adsorption were also proposed. This study demonstrates the potential of nano mesoporous La2O3 as an effective adsorbent for removing phosphate from contaminated water.