Abstract
The thiourea (T) -formaldehyde (F) resins with different lamellar crystal structures were synthesized by varying the relative T/F molar ratio in acidic aqueous solution at 55°C. By maintaining the amount of formaldehyde more than that of thiourea, the polymerization reaction allows one to transform the lamellar crystal fragments into cross-linked microspheres, TF resin that has a somewhat high absorption capability to Cr3+.
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