Full-Text Search:
Home|Journal Papers|About CNKI|User Service|FAQ|Contact Us|中文
《ACTA PEDOLOGICA SINICA》 1997-04
Add to Favorite Get Latest Update

COORDINATION FORMS AND TRANSFORMATIONS OF PHOSPHATE ADSORBED BY GOETHITE SURFACE ON DIFFERENT pH

Liu Fan;Jie Xiaolei; He Jizheng; Zhou Daihua Xu Fenglin and Li Xueyuan(Huazhong Agricultural University , Wuhan 430070)  
X-ray photoelectron spectroscopy (XPS) tecnique was used to study the coordination forms and transformation characterishcs of P on goethite surfaces atdifferent pH. The results showed that the chemical forms of P on goethite surfaceschanged from the dondnance of monofadical ligands to that of biradical ones with increasing pH of the solutions. For a given P concentration, increasing the pH of suspension could cause a faster transformation of monoradical ligands of P to thebiradical ones on goethite surfaces, while lowering the pH the biradical ligands converted slowly to the monoradical ones. By influencing types of phosphate ions inthe solution, pH affected the coordination forms of P on goethite surfaces. Thedissociation and association of protons of the sorbed P caused by pH changes wereconsidered as a major reason leading to the transformation of the coordination forms of P on the surfaces. The stability of biradical ligands of P was greater than that of monoradical ones, and the possible reasons were disscussed in the paper.
【Fund】: 国家自然科学基金!49471044
【CateGory Index】: S153
Download(CAJ format) Download(PDF format)
CAJViewer7.0 supports all the CNKI file formats; AdobeReader only supports the PDF format.
©2006 Tsinghua Tongfang Knowledge Network Technology Co., Ltd.(Beijing)(TTKN) All rights reserved