Modification of theseaweed with EDA reduced the DOC content by half (50%) and also removed the green colouration.Kinetic studies showed that the adsorbent was able to take up to 95% of the metals (in synthetic standardsolutions) in less than 10 min. The adsorbed metals were then stripped using a solution of 0.5 M HNO3indicating that the adsorbent can be regenerated. In addition, the study revealed that modificationimproved the thermal stability of the adsorbent such that even when the temperature was raised to1000 C, more than 80% (compared to <50% for unmodified weed) of the modified adsorbent was notdegraded, indicating that modification had a significant influence on the thermal stability of seaweed.The modified seaweed has been shown to have great potential for the removal of metals and DOC in pollutedwater. The modified adsorbent can therefore be applied for the removal of metals in polluted watershence suitable for treatment of water for domestic consumption at a point of use.
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