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Effect of soil humic and fulvic acids, pH and ionic strength on Th(IV) sorption to TiO2 nanoparticles.
Appl Radiat Isot. 2007 Apr; 65(4):375-81.AR

Abstract

Thorium is considered as a chemical analog of other tetravalent actinides. Herein, the sorption of Th(IV) on TiO(2) in the presence or absence of soil fulvic acid (FA)/humic acid (HA) as a function of pH, ionic strength and FA/HA concentration has been studied by a batch method. The morphology was characterized by scanning electron microscopy (SEM). The results indicate that sorption of Th(IV) on TiO(2) increases from 0% to approximately 94% at pH 1 approximately 4, and then maintains level with increasing pH values. Both FA and HA have a positive effect on Th(IV) sorption at low pH values and the contribution of FA on Th(IV) sorption is rather higher than that of HA at pH<4. The sorption is weakly dependent on the concentration of KNO(3) in solution, but the cations K(+), Na(+) and Li(+) influence Th(IV) sorption more obviously. The batch results indicate that the inner sphere complex formation is formed at bare surfaces or FA/HA-bound TiO(2) particle surfaces. Results of SEM analysis show that the particle sizes of TiO(2), Th-TiO(2) and Th-HA-TiO(2) colloids are quite different. Surface complexation may be considered as the main sorption mechanism.

Authors+Show Affiliations

Institute of Plasma Physics, Chinese Academy of Sciences, P.O. Box 1126, 230031 Hefei, P.R. China.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

17157512

Citation

Tan, Xiaoli, et al. "Effect of Soil Humic and Fulvic Acids, pH and Ionic Strength On Th(IV) Sorption to TiO2 Nanoparticles." Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine, vol. 65, no. 4, 2007, pp. 375-81.
Tan X, Wang X, Chen C, et al. Effect of soil humic and fulvic acids, pH and ionic strength on Th(IV) sorption to TiO2 nanoparticles. Appl Radiat Isot. 2007;65(4):375-81.
Tan, X., Wang, X., Chen, C., & Sun, A. (2007). Effect of soil humic and fulvic acids, pH and ionic strength on Th(IV) sorption to TiO2 nanoparticles. Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine, 65(4), 375-81.
Tan X, et al. Effect of Soil Humic and Fulvic Acids, pH and Ionic Strength On Th(IV) Sorption to TiO2 Nanoparticles. Appl Radiat Isot. 2007;65(4):375-81. PubMed PMID: 17157512.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Effect of soil humic and fulvic acids, pH and ionic strength on Th(IV) sorption to TiO2 nanoparticles. AU - Tan,Xiaoli, AU - Wang,Xiangke, AU - Chen,Changlun, AU - Sun,Aihua, Y1 - 2006/12/08/ PY - 2006/07/31/received PY - 2006/09/20/revised PY - 2006/10/19/accepted PY - 2006/12/13/pubmed PY - 2007/6/1/medline PY - 2006/12/13/entrez SP - 375 EP - 81 JF - Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine JO - Appl Radiat Isot VL - 65 IS - 4 N2 - Thorium is considered as a chemical analog of other tetravalent actinides. Herein, the sorption of Th(IV) on TiO(2) in the presence or absence of soil fulvic acid (FA)/humic acid (HA) as a function of pH, ionic strength and FA/HA concentration has been studied by a batch method. The morphology was characterized by scanning electron microscopy (SEM). The results indicate that sorption of Th(IV) on TiO(2) increases from 0% to approximately 94% at pH 1 approximately 4, and then maintains level with increasing pH values. Both FA and HA have a positive effect on Th(IV) sorption at low pH values and the contribution of FA on Th(IV) sorption is rather higher than that of HA at pH<4. The sorption is weakly dependent on the concentration of KNO(3) in solution, but the cations K(+), Na(+) and Li(+) influence Th(IV) sorption more obviously. The batch results indicate that the inner sphere complex formation is formed at bare surfaces or FA/HA-bound TiO(2) particle surfaces. Results of SEM analysis show that the particle sizes of TiO(2), Th-TiO(2) and Th-HA-TiO(2) colloids are quite different. Surface complexation may be considered as the main sorption mechanism. SN - 0969-8043 UR - https://www.unboundmedicine.com/medline/citation/17157512/Effect_of_soil_humic_and_fulvic_acids_pH_and_ionic_strength_on_Th_IV__sorption_to_TiO2_nanoparticles_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0969-8043(06)00377-0 DB - PRIME DP - Unbound Medicine ER -