3.2. Effect of pH
Bamboo charcoal can generate a good amount of negative (more
precisely, negative-charged) ions. The presence of a large quantity of
surface negative charge and a high charge density is also reported by
Liang et al. [39].
The pH of the solution is one of the most important factors in the
study of the adsorption of metal ions on solids. The state of metal ions in
solution strongly depends on the pH. The acidity and basicity of the
various solutions can influence the composition and the properties of
the adsorbent surface. Therefore, in order to determine the optimumpH
for metal adsorption, the adsorption was studied at various pH.
Adsorption pH had a range from2 to 7. At lowpH values, the adsorption
of heavy metals is zero. As the pH increases, the adsorption of heavy
metals also increased and maximum adsorption for Ni(II) occurred at
5.0 pH both with MBRC and MBAC. Whereas, maximum adsorption of
Zn(II) took place at 6.0 pH for MBRC and MBAC (Fig. 4).
This adsorption behavior of Ni(II) and Zn(II) ions can be explained
thus — at very low pH, higher concentration of H+ ions compete with
metals ions for the adsorption sites of charcoal, resulting in decreased
adsorption of Ni(II) and Zn(II) ions. The increase in the adsorption of
Ni(II) and Zn(II) ions at the pH range from 2 to 5 and 2 to 6,
3.2. Effect of pH
Bamboo charcoal can generate a good amount of negative (more
precisely, negative-charged) ions. The presence of a large quantity of
surface negative charge and a high charge density is also reported by
Liang et al. [39].
The pH of the solution is one of the most important factors in the
study of the adsorption of metal ions on solids. The state of metal ions in
solution strongly depends on the pH. The acidity and basicity of the
various solutions can influence the composition and the properties of
the adsorbent surface. Therefore, in order to determine the optimumpH
for metal adsorption, the adsorption was studied at various pH.
Adsorption pH had a range from2 to 7. At lowpH values, the adsorption
of heavy metals is zero. As the pH increases, the adsorption of heavy
metals also increased and maximum adsorption for Ni(II) occurred at
5.0 pH both with MBRC and MBAC. Whereas, maximum adsorption of
Zn(II) took place at 6.0 pH for MBRC and MBAC (Fig. 4).
This adsorption behavior of Ni(II) and Zn(II) ions can be explained
thus — at very low pH, higher concentration of H+ ions compete with
metals ions for the adsorption sites of charcoal, resulting in decreased
adsorption of Ni(II) and Zn(II) ions. The increase in the adsorption of
Ni(II) and Zn(II) ions at the pH range from 2 to 5 and 2 to 6,
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