Research Article Open Access

Basic and Reactive Dyes Sorption Enhancement of Rice Hull through Chemical Modification

Siew-Teng Ong, Pei-Sin Keng and Chnoong-Kheng Lee


Problem statement: Many studies have been conducted on the removal of either anionic or cationic dyes. However, as a mixture of dyes does commonly exist together in wastewater, therefore it is of great interest to have a material that can remove both types of dyes. Approach: To prepare an inexpensive and efficient sorbent by chemically modifying rice hull for the removal of both basic and reactive dyes. Different chemical modifications were performed on rice hull and a comparison study on the uptake of dyes was carried out. Optimization study was carried out on most promising modified rice hull. Surface morphology of modified rice hull was examined and the functional groups present were determined using FTIR. Results: From the results, it appeared that by using EDA modified rice hull, an appreciable amount of both dyes could be sorbed. Varying the EDA/NRH ratios and heating temperatures affected the uptake of BB3 and RO16. The investigated sorbents were non-porous materials, due to the absence of pores and cavities. Sorption-desorption study showed that a complete recovery of BB3 can be obtained using high concentrations of H2SO4 and HCl but the desorption experiments of RO16 using NH3 and NaOH were not successful. Conclusion: The modification of rice hull with EDA under the optimum conditions (in a ratio of 1.00 g of NRH to 0.02 mole of EDA in a well stirred water bath at 80°C for 2 h) resulted in the formation of a sorbent (MRH) that could be used successfully to remove Both Basic (BB3) and Reactive dyes (RO16).

American Journal of Applied Sciences
Volume 7 No. 4, 2010, 447-452


Submitted On: 12 March 2010 Published On: 30 April 2010

How to Cite: Ong, S., Keng, P. & Lee, C. (2010). Basic and Reactive Dyes Sorption Enhancement of Rice Hull through Chemical Modification. American Journal of Applied Sciences, 7(4), 447-452.

  • 14 Citations



  • Adsorption
  • dyes
  • batch study
  • column study
  • surface morphology
  • wastewater