화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.20, No.4, 2119-2129, July, 2014
DOI10.1016/j.jiec.2013.09.041  Export Citation
Removal of Congo red from aqueous solution by two variants of calcium and iron based mixed oxide nano-particle agglomerates
Sushanta Debnath†, Jacob Kitinya, and Maurice Stephen Onyango†
  • Department of Chemical, Metallurgical and Material Engineering, Tshwane University of Technology, Private Bag X680, Pretoria, South Africa
E-mail:,
Congo red was removed from aqueous solution using nano-crystalline agglomerates of calcium-iron mixed oxide (CaIMO) and iron-calcium mixed oxide (ICaMO) (CaIMO: 30-25 nm; ICaMO: 22-19 nm). The optimum pH was 8.0 (±0.1). Kinetically, pore diffusion with pseudo-second order equation governs the overall adsorption process. Langmuir and Redlich.Peterson isotherms describe the experimental data. Negative △Go (-20.78 to -15.25 kJ mol-1) and negative △Ho (-26.21 and -105.59 kJ mol-1) indicated spontaneous and exothermic reaction. Adsorbents are 4th cycle regenerated using 0.05 M NaOH. Both CaIMO and ICaMO are competitive materials for CR removal from aqueous solution.
Keywords:Congo red;Adsorption;Calcium iron mixed oxide;Iron calcium mixed oxide;Regeneration
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