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100 ml of 0.16 mol l−1sodium thio-sulfate (Na2S2O3, Aldrich) aqueous solution was mixed with100 ml of 0.4 mol l−1PVP (molecular weight of ¡«40,000, Aldrich).Then, 3.2 ml of concentrated hydrochloric acid was added to theNa2S2O3/PVP solution under magnetic stirring at room tempera-ture. After reacted for 6 h, yellowish white precipitate was collectedand washed three times with water¡£ Õâ¶ÎÎÄÏ×ÖпÉÒԺϳÉ400-600ÄÉÃ×µÄÁò¡£µ«ÊÇÎÄÏ×ÖеÄPvP¸Ð¾õºÃ¶à£¬²»ÖªµÀ¶Ô²»¶Ô£¿²»ÊÇ˵·´Ó¦Ê±¼äÔ½³¤ÁòÄÉÃ×Á£¾¶Ô½´óÂð£¿ÎªÊ²Ã´ÎÄÏ×ÖÐÈÔÈ»»á·´Ó¦6Сʱ£¿ |
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