Patent ID: 6989102

Claim:
A method of treating water for removal of heavy metals, which comprises contacting heavy metal contaminated water with an activated carbon/alginate gel adsorbent prepared by a process comprising adding dropwisely a mixed solution of 0.1-10 wt % alginate and 0.1-10 wt % activated carbon powder to a polyvalent cationic solution to form an activated carbon/alginate gel adsorbent, thereby cross-linking alginic acid with polyvalent cations, drying the activated carbon/alginate gel adsorbent, and applying a coating to the activated carbon/alginate gel adsorbent to prevent the effluence of activated carbon dust and increase adsorption capability of heavy metal ions, said coating application comprising immersing the dried activated carbon/alginate gel adsorbent in an alginate solution of 0.05-5 wt % alginate, and immersing the activated carbon/alginate gel adsorbent in a polyvalent cationic solution.