Adsorption parameters of Cd(II), Pb(II), and Hg(II) on zirconium(IV) phosphate chemically grafted onto silica gel surface

被引:42
作者
Nagata, N [1 ]
Kubota, LT [1 ]
Bueno, MIMS [1 ]
Peralta-Zamora, PG [1 ]
机构
[1] Univ Estadual Campinas, Inst Quim, BR-13083970 Campinas, SP, Brazil
基金
巴西圣保罗研究基金会;
关键词
adsorption; cadmium; lead; mercury; zirconium-phosphate-modified silica;
D O I
10.1006/jcis.1997.5344
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
Adsorption properties of metallic ions not essential for human metabolism, such as cadmium, lead, and mercury, on silica chemically modified with zirconium(IV) phosphate, SiZrP, were investigated using batch systems. The immobilization procedure was efficient and the functionalization degree was 2.82% for zirconium (0.31 mol g(-1)) and 2.54% for PO43-(0.27 mol g(-1)). These results indicate that phosphate reacted with zirconium in a 1:1 ratio. The equilibrium is reached very quickly( 15 min), indicating that the adsortion sites are well exposed, The best adsorption parameters were evaluated using 50 mL of aqueous phase at pH 4.5, an adsorption time of 15 min, and 0.2000 g of adsorbent. From adsorption isotherms obtained for the metals ions and distribution coefficients the affinity of SiZrP for the metal ions studied increases in the order Cd(II) < Pb(II) < Hg(II). Twice as much lead was adsorbed by the SiZrP surface (Nf = 10.0 mu mol g(-1))as cadmium (Nf = 5.0 mu mol g(-1)). For mercury, the capacity was greater; nevertheless an adsorption plateau was not observed. (C) 1998 Academic Press.
引用
收藏
页码:121 / 125
页数:5
相关论文
共 30 条
  • [1] BASSET J, 1981, VOGELS ANALISE INORG
  • [2] BOICHINOVA ES, 1982, J APPL CHEM-USSR+, V55, P46
  • [3] BORTUN AI, 1994, UKR CHIM ZH, V60, P551
  • [4] STABILITY AND SURFACE-ACIDITY OF NIOBIUM(V) OXIDE GRAFTED ON A SILICA-GEL SURFACE
    DENOFRE, S
    GUSHIKEM, Y
    DECASTRO, SC
    KAWANO, Y
    [J]. JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS, 1993, 89 (07): : 1057 - 1061
  • [5] DENOFRE S, 1991, THESIS U ESTADUAL CA
  • [6] Sorption and preconcentration of metal ions in ethanol solution with a silica gel surface chemically modified with benzimidazole
    Dias, NL
    Gushikem, Y
    Polito, WL
    Moreira, JC
    Ehirim, EO
    [J]. TALANTA, 1995, 42 (11) : 1625 - 1630
  • [7] Use of chemically modified silica with beta-diketoamine groups for separation of alpha-lactoalbumin from bovine milk whey by affinity chromatography
    Gambero, A
    Kubota, LT
    Gushikem, Y
    Airoldi, C
    Granjeiro, JM
    Taga, EM
    Alcantara, EFC
    [J]. JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1997, 185 (02) : 313 - 316
  • [8] ADSORPTION OF MX2 (M = MN, NI, CU, ZN, AND CD - X = CL, BR, AND I) AND FECL3 BY MODIFIED SILICA SURFACE WITH IMIDAZOLYLPROPYL GROUP
    GUSHIKEM, Y
    MOREIRA, JC
    [J]. JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1985, 107 (01) : 70 - 74
  • [9] GUSHIKEM Y, 1991, P INT C ION EXCH TOK, P607
  • [10] Gushikem Y., 1990, J BRAZIL CHEM SOC, V1, P84