EFFECTS OF INORGANIC AND ORGANIC ADDITIVES ON THE ADSORPTION OF NONIONIC POLYACRYLAMIDE ON HEMATITE

被引:17
作者
LEE, LT [1 ]
SOMASUNDARAN, P [1 ]
机构
[1] COLUMBIA UNIV,NEW YORK,NY 10027
基金
美国国家科学基金会;
关键词
D O I
10.1016/0021-9797(91)90076-K
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The effects of inorganic anions such as chloride, sulfate, and phosphate on the adsorption of nonionic polyacrylamide on hematite are studied. Adsorption of the polymer is reduced in all cases, with complete depression by phosphate. The relative effectiveness of these anions in reducing polymer adsorption increases in the order chloride < sulfate < phosphate, a trend which corresponds to the relative stabilities of the anion-Fe3+ complex formation. The effectiveness of sulfate and phosphate in competing with the polymer for surface sites is explained in terms of the strong interaction of these anions with FeOH2+ and FeOH by ligand exchange, replacing the surface hydroxyl groups. Since at lower pH there is higher interaction of these anions with the surface, the effect of pH on polymer adsorption is reversed. Urea is also found to decrease polymer adsorption. In this case, the phenomenon is due to H-bonding of the urea with the surface hydroxyls, depleting adsorption sites for the polymer. © 1991.
引用
收藏
页码:470 / 479
页数:10
相关论文
共 21 条
[1]  
[Anonymous], 1964, SPECIAL PUBLICATION
[2]  
[Anonymous], 1960, HYDROGEN BOND
[3]  
[Anonymous], 1979, CHEM SILICA
[4]   STUDIES ON EXTRACTION AND ON AVAILABILITY TO PLANTS OF ADSORBED PLUS SOLUBLE SULFATE [J].
BARROW, NJ .
SOIL SCIENCE, 1967, 104 (04) :242-+
[5]   PHYSICAL AND CHEMICAL ADSORPTION OF IONS IN ELECTRICAL DOUBLE-LAYER ON HEMATITE (ALPHA-FE2O3) [J].
BREEUWSMA, A ;
LYKLEMA, J .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1973, 43 (02) :437-448
[6]  
BREEUWSMA A, 1973, THESIS AGR U WAGENIN
[7]   DESORPTION OF POLYACRYLAMIDE AND HYDROLYZED POLYACRYLAMIDE FROM KAOLINITE SURFACE [J].
DODSON, PJ ;
SOMASUNDARAN, P .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1984, 97 (02) :481-487
[8]  
EMERSON W. W., 1964, AUSTRALIAN J SOIL RES, V2, P46, DOI 10.1071/SR9640046
[9]  
GERBHARDT JE, 1982, INTERFACIAL PHENOMEN, P175
[10]   ROLE OF SURFACE SILANOL GROUPS IN FLOCCULATION OF SILICA SUSPENSIONS BY POLYACRYLAMIDE .1. CHEMISTRY OF ADSORPTION PROCESS [J].
GRIOT, O ;
KITCHENER, JA .
TRANSACTIONS OF THE FARADAY SOCIETY, 1965, 61 (509P) :1026-+