Solution Chemistry Effects on Orthophosphate Adsorption by Cationized Solid Wood Residues

K.G.Karthikeyan; Mandla A.Tshabalala; D.WangM.Kalbasi

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Solution Chemistry Effects on Orthophosphate Adsorption by Cationized Solid Wood Residues

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Adsorption of orthophosphate anions in aqueous solution by cationized milled solid wood residues was characterized as a function of sorbate-to-sorbent ratio (~0.001-2.58 mmol of Pig substrate),pH (3-9),ionic strength,/ (no / control;0.001 and 0.01 M NaCI),reaction time (4 min to 24 h),and in the presence of other competing anions (0.08-50 mM SO_4~(2-);0.08-250 mM NO_3-).Sorption isotherms revealed the presence of two kinds of adsorption sites corresponding to high and low binding affinities for orthophosphate anions.Consequently,a two-site Langmuir equation was needed to adequately describe the data over a range of solution conditions.In addition to higher sorption capacity,cationized bark possessed a higher binding energy for orthophosphate anions compared to cationized wood.The sorption capacity and binding energy for bark were 0.47 mmol of P g-l and 295.7 L mmol-1,respectively,and for wood,the corresponding values were 0.27 mmol g~(-1) and 61.4 L mmol-1.Both the sorption capacity and binding energy decreased with increasing /,due to competition from CI-ions for the available anion-exchange sites.The surface charge characteristics of cationized bark (pHzpc = 7.9)acted in concert with orthophosphate speciation to create a pH-dependent sorption behavior.Orthophosphate uptake was quite rapid and attained equilibrium levels after 3 h.Both SO_4~(2-)and NO_3-influenced percent removal but required high relative competing anion to H2PO4-molar ratios,i.e.,2.5-3 for SO_4~(2-)and 25 for SO_3~-to cause appreciable reduction.These results support our hypothesis that adsorption of orthophosphate anions on cationized bark involves ion exchange and other specific Lewis acid-base interactions.

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《Environmental Science & Technology: ES&T》 |2004年第3期|904-911|共8页
作者
K.G.Karthikeyan; Mandla A.Tshabalala; D.WangM.Kalbasi;
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作者单位

Biological Systems Engineering Department,460 Henry Mall,University of Wisconsin,Madison,Wisconsin 53706;

USDA Forest Service,Forest Products Laboratory,One Gifford Pinchot Drive,Madison,Wisconsin 53726-2398;

Biological Systems Engineering,Washington State University,Pullman,Washington 99164Biological Systems Engineering Department,University of Wisconsin,Madison,Wisconsin 53706;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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正文语种英语
中图分类环境化学;
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Solution Chemistry Effects on Orthophosphate Adsorption by Cationized Solid Wood Residues

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