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Surface modification of montmorillonite by means of Mg~(2+) insertion reaction has been studied and a positively charged montmorillonite has been prepared. The effects of preparation temperature and Mg~(2+) concentration on the positive charge property of the clay and on the clay coagulating Heterosigma akashiwo have been studied. The results showed that the modified clay enhanced the coagulation and the used amount decreased to 1/5—1/10 of the original. The removal rates of Heterosigma akashiwo were correlated positively with positive charge on the clay in accordance with theoretical model.
Surface modification of montmorillonite by means of Mg ~ (2+) insertion reaction has been studied and positively charged montmorillonite has been prepared. The effects of preparation temperature and Mg ~ (2+) concentration on the positive charge property of the clay and on the clay surface of the clay coagulating Heterosigma akashiwo have been studied. The results showed that the modified clay enhanced the coagulation and the used amount decreased to 1 / 5-1 / 10 of the original. The removal rates of Heterosigma akashiwo were correlated positively with positive charge on the clay in accordance with theoretical model.