Adsorption of neutral red (NR) on the raw peanut shell (PS) and NaOH-modified peanut shell (NaOH-PS) was examined and its5 effects of pH was investigated. The removal ratios of NR on PS and NaOH-PS after 2 h were 95.0 and 98.1, respectively. The removal ratio of NR is increased by increasing the pH value. Equilibrium data fitted very well in a Langmuir isotherm equation, the adsorption capacity of NR onto PS and NaOH-PS were 126.58 mg/g and 192.31 mg/g, respectively. The adsorption mechanisms can be contributed by hydrophobicity interaction at the interface occurs between NR and PS and NaOH-PS. The present study shows that the NaOH-modified peanut shell can be used as an inexpensive, effective and easily used adsorbent for the removal of neutral red from its aqueous solutions.
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