A Natural Montmorillonite-Based Magsorbent as an Effective Scavenger for Cadmium Contamination

Akar S., Sayın F., Ozdemir I., Tunc D.

WATER AIR AND SOIL POLLUTION, vol.231, 2020 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 231
  • Publication Date: 2020
  • Doi Number: 10.1007/s11270-020-04743-3
  • Journal Name: WATER AIR AND SOIL POLLUTION
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, ABI/INFORM, Agricultural & Environmental Science Database, Aqualine, Aquatic Science & Fisheries Abstracts (ASFA), Artic & Antarctic Regions, BIOSIS, Biotechnology Research Abstracts, CAB Abstracts, Chimica, Compendex, EMBASE, Environment Index, Geobase, Greenfile, Pollution Abstracts, Veterinary Science Database, Civil Engineering Abstracts
  • Keywords: Montmorillonite, Magnetic sorbent, Adsorption, Cadmium, Isotherm, Kinetics, AQUEOUS-SOLUTION, IRON-OXIDE, ADSORPTION CAPACITY, METHYLENE-BLUE, REMOVAL, IONS, CLAY, ADSORBENT, BIOMASS, COPPER
  • Eskisehir Osmangazi University Affiliated: Yes

Abstract

In this study, a magnetic montmorillonite composite (MMC) was prepared by a coprecipitation method, evaluated as sorbent for Cd(II) ions and characterized by IR spectroscopy, SEM, EDX, VSM, and zeta potential measurement. The adsorption potential of MMC was tested in both batch and continuous modes at different initial pH levels, sorbent dosages, contact times, ionic strengths, flow rates, and bed depths. The adsorption performance of MMC was found maximum at an original solution pH of 5.9 with 0.18 g sorbent for Cd(II). Fast adsorption equilibrium was established within 10 min. Kinetic and isotherm studies showed that the adsorption data followed the pseudo-second-order kinetic model and Langmuir isotherm. The maximum monolayer adsorption capacity of MMC was 0.325 mmol g(-1). Cd(II) adsorption was mainly controlled by ion exchange, electrostatic interaction, and surface complexation mechanisms. Desorption and reusability studies revealed that MMC can be a promising alternative for the effective adsorption of Cd(II) in aqueous solutions of environmental remediation.