Open AccessRemoval of Some Heavy Metals [Pb(II), Cd(II), Zn(II)] in Polluted Waters using Acid- Functionalized MCM-41 Mesoporous Materials: Adsorption Isotherm and Kinetic Studies
Author(s) -
Jayarangarao Prathipati,
Paul Douglas Sanasi
Publication year - 2021
Publication title -
asian journal of chemistry/asian journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.145
H-Index - 34
eISSN - 0975-427X
pISSN - 0970-7077
DOI - 10.14233/ajchem.2021.23397
Subject(s) - chemistry , adsorption , freundlich equation , mesoporous material , atomic absorption spectroscopy , nuclear chemistry , tungsten , surface modification , inorganic chemistry , bet theory , mesoporous silica , precipitation , catalysis , organic chemistry , physics , quantum mechanics , meteorology
Acid functionalized mesoporous silica materials like sulphonic acid (SO3HMCM-41) andphosphotungstic acid (PWMCM-41) were synthesized by a simple co-precipitation method. Thesematerials were characterized using XRD, SEM-EDS, FT-IR, BET surface area techniques. Themesoporosity was retained even after acid functionalization into MCM-41. There was a significantfall in the surface area (SBET, m2 g-1), on incorporation of sulphonic acid (-SO3H) and phosphorous,tungsten atoms into the MCM-41 material. SO3HMCM-41 was found to be more acidic than PWMCM-41and MCM-41. Their performance was evaluated by conducting experiments on the removal of heavymetals like Pb(II), Cd(II), Zn(II) present in industrial wastewaters, with atomic absorptionspectrophotometer (AAS). The required experimental factors were analyzed and it was observed thatthe removal of metals was more efficient with the acid-functionalized materials than with MCM-41.Freundlich adsorption isotherm and pseudo-first order kinetics have confirmed the validity of theresults.