An EXAFS study on the adsorption structure of phenyl-substituted organoarsenic compounds on ferrihydrite.
Journal of Colloid and Interface Science(2014)
摘要
Adsorption structures of mono- and diphenyl substituted organoarsenic compounds (PAA and DPAA, respectively) on ferrihydrite were analyzed by extended X-ray absorption fine structure (EXAFS), which suggested that PAA and DPAA form inner-sphere complexes with ferrihydrite regardless of their bulky functional groups. In addition, coexistence of two types of inner-sphere complex modes, i.e. bidentate-binuclear and monodentate surface complexes was suggested by EXAFS fitting with two type of the As-Fe shell.
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关键词
Organic arsenic,Phenylarsonic acid (PAA),Diphenylarsinic acid (DPAA),Adsorption structure,Ferrihydrite,Extended X-ray absorption fine structure (EXAFS),Quantum chemical calculation
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