Removal of Se(IV) and Se(VI) from water by aluminum-oxide-coated sand

被引:150
作者
Kuan, WH [1 ]
Lo, SL
Wang, MK
Lin, CF
机构
[1] Natl Taiwan Univ, Grad Inst Environm Engn, Taipei 106, Taiwan
[2] Natl Taiwan Univ, Dept Agr Chem, Taipei 106, Taiwan
关键词
aluminum-oxide-coated sand; Se(IV); Se(VI); coating; adsorption;
D O I
10.1016/S0043-1354(97)00228-5
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Aluminum-oxide-coated sand (AOCS) was evaluated for the removal of selenite (Se(IV)) and selenate (Se(VI)) from water. Quartz sand was coated at 70 degrees C using 1 M AlCl3 solution aging for 2 d at various coating pH (pH((coating))). The characteristics of the AOCS surface were Ph-(coating)-dependent. The Al oxide coating was an X-ray noncrystalline, porous compound at low pH((coating)), while at high ph((coating)) the AOCS could better withstand acid/alkali and the coatings tended to form crystalline boehmite and bayerite. Adsorption of Se(IV) and Se(VI) was more effective using sand coated at low pH((coating)) than at high pH((coating)). AOCS produced at pH((coating)) 5.98 had optimum properties and was employed as the adsorbent for the present adsorption studies. Adsorption experiments of Se(IV) and Se(VI) by AOCS performed as a function of pH, initial concentration, reaction time, and competing ion concentrations were examined. Removal of Se(IV) and Se(IV) increased with decreasing pH but was obviously greater for Se(IV) than Se(VI). In Se(IV) and Se(VI) mixed systems, the adsorption of Se(IV) was evidently inhibited by Se(VI) only at system pH ranging from 3 to 8, and the degree of inhibition was similar at Se(VI) to Se(IV) molar ratios of 1 and 3. However, Se(VI) adsorption significantly decreased with increasing Se(IV) concentration at all system pH. The sequence of foreign anions competing with respect to Se(IV) and Se(VI) adsorption was in the order of SO42-> HCO3-. (C) 1998 Elsevier Science Ltd. All rights reserved.
引用
收藏
页码:915 / 923
页数:9
相关论文
共 31 条
[1]  
Alloway J., 1995, HEAVY METALS SOILS, V2nd
[2]  
[Anonymous], 1989, SELENIUM AGR ENV
[3]   SORPTION ONTO AND RECOVERY OF CR(VI) USING IRON-OXIDE-COATED SAND [J].
BAILEY, RP ;
BENNETT, T ;
BENJAMIN, MM .
WATER SCIENCE AND TECHNOLOGY, 1992, 26 (5-6) :1239-1244
[4]   SELENIUM ADSORPTION BY GOETHITE [J].
BALISTRIERI, LS ;
CHAO, TT .
SOIL SCIENCE SOCIETY OF AMERICA JOURNAL, 1987, 51 (05) :1145-1151
[5]   SELENITE AND SELENATE QUANTIFICATION BY HYDRIDE GENERATION ATOMIC-ABSORPTION SPECTROMETRY, ION CHROMATOGRAPHY, AND COLORIMETRY [J].
BLAYLOCK, MJ ;
JAMES, BR .
JOURNAL OF ENVIRONMENTAL QUALITY, 1993, 22 (04) :851-857
[6]   CLUSTER FORMATION VERSUS ISOLATED-SITE ADSORPTION - A STUDY OF MN(II) AND MG(II) ADSORPTION ON BOEHMITE AND GOETHITE [J].
BLEAM, WF ;
MCBRIDE, MB .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1985, 103 (01) :124-132
[7]   SURFACE-IONIZATION AND COMPLEXATION AT THE OXIDE-WATER INTERFACE .3. ADSORPTION OF ANIONS [J].
DAVIS, JA ;
LECKIE, JO .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 1980, 74 (01) :32-43
[8]   STUDY OF THE NATURE OF SURFACES WITH POLAR MOLECULES .2. THE ADSORPTION OF WATER ON ALUMINAS [J].
DEBOER, JH ;
FORTUIN, JMH ;
LIPPENS, BC ;
MEIJS, WH .
JOURNAL OF CATALYSIS, 1963, 2 (01) :1-7
[9]  
Dzombak D.A., 1990, SURFACE COMPLEXATION
[10]  
EDWARDS M, 1989, RES J WATER POLLUT C, V61, P1523