The potential of the Senegal date palm (Phoenix reclinata) seed bio-char to remove chromium (VI) ions from aqueous solutions by
adsorption was investigated. Adsorption experiments were performed on the
tannery effluent and standard aqueous solutions of chromium (VI) for varying
adsorbent doses, contact times, pH, temperatures, and interfering anionic ions
by batch mode. Phoenix reclinata seeds (PRS) bio-char was used in the investigation and the residual
chromium (VI) was determined using the atomic absorption spectrophotometer
(AAS). Results showed that the bio-char removed up to 86% of chromium (VI) ions
in the effluent at pH 2. The highest percentage adsorption registered was 97%
in an aqueous solution of chromium (VI) at pH 1 and this dropped to less than
10% at pH greater than 2. A general increase in adsorption with theincrease in temperature was
observed but reduced when the temperature was raised beyond 60°
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