| 摘要 |
<p>A method is provided herein for removing heavy metals and negatively-charged materials from water. The method includes contacting the water with an adsorbent cloth or fabric at least part of which is cellulosic, which has been pretreated with an alkali, which was then preferably heated mildly until it was dry, followed by washing, upon which high molecular weight polyethyleneimine has been adsorbed and fixed thereon with a cross-linking agent. Examples of suitable such cross-linking agents include bifunctional or multifunctional epoxy cross-linking agents, e.g., glutaraidehyde, epichlorohydrin, 1,4butandioldiglycidyl ether, 1,2-ethanedioldiglycidyl ether, 1,3-diglycidylglycerol, triglycidylglycerol, pentaerythritol, tetraglycidyl ether, etc.</p> |
