| Abstract |
| This study investigated the Cr6+ and As3+ sorption performance of Hizikia fusiformis (HF) marine brown seaweed biomass. Heavy metal sorption was highly pH dependent with maximum Cr6+ and As3+ sorption occurring at pH 2.0 and pH 8.0, respectively. Kinetic data showed that sorption occurred rapidly during the first 120min, with most metal ions being bound to HF biomass within 360 min. A higher correlation coefficient (r2 > 0.945) indicated that adsorption data are best fitted to both the Freundlich and Langmuir isotherm models. The Cr6+ (As3+) of the Freundlich constants, KF and 1/n, were 4.900 L/g (0.834 L/g) and 0.385 L/g (0.598 L/g), respectively, for HF biomass. The Cr6+ (As3+) of the Langmuir constants, Qm and b, were 10.295 mg/g (43.565 mg/g) and 27.767 L/mg (17.425 L/mg), respectively, for HF biomass. Fourier transform infrared analysis (FTIR) revealed interactions among amino, carboxyl, sulfonate, and hydroxyl groups during Cr6+ and As3+ binding to HF biomass. This study shows that HF biomass has potential application as a sorbent for the removal of anion heavy metals from residual waters. |
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| Key Words |
| Sorption, Heavy matters, Isotherm model, seaweed |
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