3.7.3. Influence of GT-cl-poly(DMA) Hydrogel and GT-cl-poly(DMA)/RGO Hydrogel Composite Dose for Removal of Hg2<sup>+</sup> and Cr6<sup>+</sup>

The effect of adsorbents dosages (0.015 – 0.065 g) on the removal of metal ions are represented in Figure 6e,f. The adsorption percentage was increased by increasing the adsorbent dosage. This was due to the existence of more adsorption sites with enhanced dose of adsorbent. The removal efficiencies of Hg2<sup>+</sup> were found to be 86.4% and 98.4% by GT-cl-poly(DMA) hydrogel and GT-cl-poly(DMA)/RGO hydrogel composite correspondingly at dose of 0.035 g. The reported Cr6<sup>+</sup> ion removal percentages were 77.2% and 82.3% by using GT-cl-poly(DMA) hydrogel and GT-cl-poly(DMA)/RGO hydrogel composite respectively at optimized dose of 0.045 g. Thus, 0.035 g (for Hg2<sup>+</sup>) and 0.045 g (for Cr6<sup>+</sup>) were the ideal doses used for experiments.
