Preparation method and application of lanthanum-iron-loaded chitosan microsphere adsorbent for removing heavy metal cadmium and phosphate in water
The invention discloses a preparation method and application of a lanthanum-iron loaded chitosan microsphere adsorbent for removing heavy metal cadmium and phosphate in water. Comprising the following steps: (1) weighing ferric chloride, completely dissolving ferric chloride in pure water, dissolvin...
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Format: | Patent |
Sprache: | chi ; eng |
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Zusammenfassung: | The invention discloses a preparation method and application of a lanthanum-iron loaded chitosan microsphere adsorbent for removing heavy metal cadmium and phosphate in water. Comprising the following steps: (1) weighing ferric chloride, completely dissolving ferric chloride in pure water, dissolving chitosan in an acid solution under stirring, and continuously stirring for 1-6 hours to obtain a Fe/chitosan mixed solution; (2) dissolving lanthanum salt into the Fe/chitosan mixed solution obtained in the step (1), and stirring for 1-6 hours to obtain a La-Fe/chitosan mixed solution; and (3) dropwise adding the La-Fe/chitosan mixed solution obtained in the step (2) into a 0.5-4M NaOH solution through an injection pump, standing for 8-12 hours, filtering, washing to be neutral, and freeze-drying for 4-12 hours to obtain the lanthanum-iron loaded chitosan microspheres. The millimeter-sized microspheres prepared by the method have different metal active sites, can efficiently and independently adsorb heavy metal c |
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