Removal of Zn (II) and Cu (II) Ions from Industrial Wastewaters Using Magnetic Biochar Derived from Water Hyacinth

<table class="fixed-width table-group" id="tab5"><tr><td><table class="table"><colgroup><col style="width:11.57em"/><col style="width:3.25em"/><col style="width:3.23em"/><col style="width:3.25em"/><col style="width:4.33em"/></colgroup><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr class="thead"><td class="align_left" rowspan="3">NaOH concentration (M)</td><td class="align_center" colspan="4">Adsorption efficiency (%)</td></tr><tr class="thead"><td class="align_center" colspan="2">EC</td><td class="align_center" colspan="2">Fe<sub>2</sub>O<sub>3</sub>-EC</td></tr><tr class="thead"><td class="align_center">Cu<sup>+2</sup></td><td class="align_center">Zn<sup>+2</sup></td><td class="align_center">Cu<sup>+2</sup></td><td class="align_center">Zn<sup>+2</sup></td></tr><tr><td class="thead-hr" colspan="5"><hr/></td></tr><tr><td class="align_left">0.10</td><td class="align_center">73</td><td class="align_center">75</td><td class="align_center">87</td><td class="align_center">88</td></tr><tr><td class="align_left" colspan="5"><hr/></td></tr><tr><td class="align_left">0.25</td><td class="align_center">75</td><td class="align_center">78</td><td class="align_center">92</td><td class="align_center">93</td></tr><tr><td class="align_left" colspan="5"><hr/></td></tr><tr><td class="align_left">0.50</td><td class="align_center">69</td><td class="align_center">70</td><td class="align_center">81</td><td class="align_center">82</td></tr><tr class="table-tr"><td colspan="5"><hr class="tbody-hr"/></td></tr></table></td></tr></table>

<div>Adsorption efficiency of adsorbents after five desorption cycles.</div>

Journal of Engineering

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Table 5

Table 5: Removal of Zn (II) and Cu (II) Ions from Industrial Wastewaters Using Magnetic Biochar Derived from Water Hyacinth 