Removal of cadmium from aqueous solutions using red mud granulated with cement

Shao Hua Ju, Shuai Dan Lu, Jin Hui Peng, Li Bo Zhang, C. Srinivasakannan, Sheng Hui Guo, Wei Li

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

A novel adsorbent was prepared from granular red mud mixed with cement and its potential to be a suitable adsorbent for the removal of cadmium ions from aqueous solutions was evaluated. The wet red mud was directly mixed up with cement at different mass fractions of 2%-8% and their properties were investigated. Based on the textural characteristics and strength, the granular red mud with 2% addition of cement maintaining for 6 d is identified to have better properties. The batch adsorption experiments for adsorption of Cd 2+ ions from solution were performed at 30, 40 and 50°C at different initial concentrations under the condition of constant pH of 6.5. The equilibrium adsorption was found to increase with the increase of temperature during the adsorption process. Langmuir adsorption isotherm model was found to match the experimental adsorption isotherm better. The kinetics of adsorption was modeled using a pseudo second order kinetic model and the model parameters were estimated.

Original languageBritish English
Pages (from-to)3140-3146
Number of pages7
JournalTransactions of Nonferrous Metals Society of China (English Edition)
Volume22
Issue number12
DOIs
StatePublished - Dec 2012

Keywords

  • adsorption
  • aqueous solutions
  • cadmium
  • cement
  • granular red mud
  • waste water processing

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