Adsorption of Pb(II) on palygorskite from aqueous solution: Effects of pH, ionic strength and temperature
Palygorskite was characterized by XRD, FTIR and acid–base titration. The fitting of surface charge density using FITEQL resulted in an excellent fitting of experimental data and following intrinsic equilibrium constants: log K XH = 2.08, log K AL–OH 2 + int = 5.46, and log K Al–O − int = − 8.58. The...
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| Veröffentlicht in: | Applied clay science 2009-07, Vol.45 (3), p.111-116 |
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| creator | Fan, Qiaohui Li, Zhan Zhao, Haogui Jia, Zehong Xu, Junzheng Wu, Wangsuo |
| description | Palygorskite was characterized by XRD, FTIR and acid–base titration. The fitting of surface charge density using FITEQL resulted in an excellent fitting of experimental data and following intrinsic equilibrium constants: log
K
XH
=
2.08, log
K
AL–OH
2
+
int
=
5.46, and log
K
Al–O
−
int
=
−
8.58. The total density of
Al–OH and
XNa were 9.76
×
10
−
5
mol/g and 1.36
×
10
−
4
mol/g, respectively. The adsorption of Pb(II) from aqueous solution on palygorskite was studied as a function of pH, ionic strength and temperature. Adsorption of Pb(II) on palygorskite was strongly dependent on pH, and weakly dependent on ionic strength. Two different adsorption mechanisms were proposed: (1) exchange reaction with little or no dependence on pH (i.e.,
X
2Pb
0
) at low pH; and (2) strong pH-dependent surface complexation reactions (
Al–OPb
+
) at neutral or alkaline conditions. The adsorption and desorption isotherms indicated that Pb(II) adsorption to palygorskite was reversible. The adsorption isotherms were simulated well by the Langmuir model. XPS analysis also indicated the adsorption species of Pb(II) to be
X
2Pb
0
at low pH and predominantly
Al–OPb
+
at higher pH. |
| doi_str_mv | 10.1016/j.clay.2009.04.009 |
| format | Article |
| fullrecord | <record><control><sourceid>proquest_cross</sourceid><recordid>TN_cdi_proquest_miscellaneous_34738794</recordid><sourceformat>XML</sourceformat><sourcesystem>PC</sourcesystem><els_id>S016913170900101X</els_id><sourcerecordid>34738794</sourcerecordid><originalsourceid>FETCH-LOGICAL-a450t-ba71c2eeb62ba0b30827598d855bfe1efe26914f4ecdb7103b07672d3516f3513</originalsourceid><addsrcrecordid>eNp9kEtLxDAUhYMoOI7-AVfZKAq2JukjrbgZxMeAoAtdhzS9GTN2mpqkwvx7U0ZcmkUOuXzn5t6D0CklKSW0vF6nqpPblBFSpyRPo-yhGa04S2pSZPtoFqE6oRnlh-jI-zUhlFVFPUNm0XrrhmBsj63Gr83FcnmJ42OQ3XZlnf80AbB2doPl1wh29Njbbpz4G3yvNajgJ-PwdIVjzSjsg4N-FT6w7FscYDOAk2F0cIwOtOw8nPzqHL0_3L_dPSXPL4_Lu8VzIvOChKSRnCoG0JSskaTJSMV4UVdtVRSNBgoaWFnTXOeg2oZTkjWEl5y1WUFLHa9sjs53fQdn48Q-iI3xCrpO9tP4Ist5VvE6jyDbgcpZ7x1oMTizkW4rKBFTqmItplTFlKoguYgSTWe_3aVXstNO9sr4PyejnJXxRO52x0Fc9duAE14Z6BW0xsXMRGvNf9_8ACjCjjQ</addsrcrecordid><sourcetype>Aggregation Database</sourcetype><iscdi>true</iscdi><recordtype>article</recordtype><pqid>34738794</pqid></control><display><type>article</type><title>Adsorption of Pb(II) on palygorskite from aqueous solution: Effects of pH, ionic strength and temperature</title><source>Elsevier ScienceDirect Journals Complete</source><creator>Fan, Qiaohui ; Li, Zhan ; Zhao, Haogui ; Jia, Zehong ; Xu, Junzheng ; Wu, Wangsuo</creator><creatorcontrib>Fan, Qiaohui ; Li, Zhan ; Zhao, Haogui ; Jia, Zehong ; Xu, Junzheng ; Wu, Wangsuo</creatorcontrib><description>Palygorskite was characterized by XRD, FTIR and acid–base titration. The fitting of surface charge density using FITEQL resulted in an excellent fitting of experimental data and following intrinsic equilibrium constants: log
K
XH
=
2.08, log
K
AL–OH
2
+
int
=
5.46, and log
K
Al–O
−
int
=
−
8.58. The total density of
Al–OH and
XNa were 9.76
×
10
−
5
mol/g and 1.36
×
10
−
4
mol/g, respectively. The adsorption of Pb(II) from aqueous solution on palygorskite was studied as a function of pH, ionic strength and temperature. Adsorption of Pb(II) on palygorskite was strongly dependent on pH, and weakly dependent on ionic strength. Two different adsorption mechanisms were proposed: (1) exchange reaction with little or no dependence on pH (i.e.,
X
2Pb
0
) at low pH; and (2) strong pH-dependent surface complexation reactions (
Al–OPb
+
) at neutral or alkaline conditions. The adsorption and desorption isotherms indicated that Pb(II) adsorption to palygorskite was reversible. The adsorption isotherms were simulated well by the Langmuir model. XPS analysis also indicated the adsorption species of Pb(II) to be
X
2Pb
0
at low pH and predominantly
Al–OPb
+
at higher pH.</description><identifier>ISSN: 0169-1317</identifier><identifier>EISSN: 1872-9053</identifier><identifier>DOI: 10.1016/j.clay.2009.04.009</identifier><identifier>CODEN: ACLSER</identifier><language>eng</language><publisher>Kidlington: Elsevier B.V</publisher><subject>Adsorption ; Earth sciences ; Earth, ocean, space ; Exact sciences and technology ; Lead ; Mineralogy ; Palygorskite ; Silicates ; Surface complexation ; XPS</subject><ispartof>Applied clay science, 2009-07, Vol.45 (3), p.111-116</ispartof><rights>2009 Elsevier B.V.</rights><rights>2009 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a450t-ba71c2eeb62ba0b30827598d855bfe1efe26914f4ecdb7103b07672d3516f3513</citedby><cites>FETCH-LOGICAL-a450t-ba71c2eeb62ba0b30827598d855bfe1efe26914f4ecdb7103b07672d3516f3513</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://www.sciencedirect.com/science/article/pii/S016913170900101X$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,776,780,3537,27901,27902,65306</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=21726666$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Fan, Qiaohui</creatorcontrib><creatorcontrib>Li, Zhan</creatorcontrib><creatorcontrib>Zhao, Haogui</creatorcontrib><creatorcontrib>Jia, Zehong</creatorcontrib><creatorcontrib>Xu, Junzheng</creatorcontrib><creatorcontrib>Wu, Wangsuo</creatorcontrib><title>Adsorption of Pb(II) on palygorskite from aqueous solution: Effects of pH, ionic strength and temperature</title><title>Applied clay science</title><description>Palygorskite was characterized by XRD, FTIR and acid–base titration. The fitting of surface charge density using FITEQL resulted in an excellent fitting of experimental data and following intrinsic equilibrium constants: log
K
XH
=
2.08, log
K
AL–OH
2
+
int
=
5.46, and log
K
Al–O
−
int
=
−
8.58. The total density of
Al–OH and
XNa were 9.76
×
10
−
5
mol/g and 1.36
×
10
−
4
mol/g, respectively. The adsorption of Pb(II) from aqueous solution on palygorskite was studied as a function of pH, ionic strength and temperature. Adsorption of Pb(II) on palygorskite was strongly dependent on pH, and weakly dependent on ionic strength. Two different adsorption mechanisms were proposed: (1) exchange reaction with little or no dependence on pH (i.e.,
X
2Pb
0
) at low pH; and (2) strong pH-dependent surface complexation reactions (
Al–OPb
+
) at neutral or alkaline conditions. The adsorption and desorption isotherms indicated that Pb(II) adsorption to palygorskite was reversible. The adsorption isotherms were simulated well by the Langmuir model. XPS analysis also indicated the adsorption species of Pb(II) to be
X
2Pb
0
at low pH and predominantly
Al–OPb
+
at higher pH.</description><subject>Adsorption</subject><subject>Earth sciences</subject><subject>Earth, ocean, space</subject><subject>Exact sciences and technology</subject><subject>Lead</subject><subject>Mineralogy</subject><subject>Palygorskite</subject><subject>Silicates</subject><subject>Surface complexation</subject><subject>XPS</subject><issn>0169-1317</issn><issn>1872-9053</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2009</creationdate><recordtype>article</recordtype><recordid>eNp9kEtLxDAUhYMoOI7-AVfZKAq2JukjrbgZxMeAoAtdhzS9GTN2mpqkwvx7U0ZcmkUOuXzn5t6D0CklKSW0vF6nqpPblBFSpyRPo-yhGa04S2pSZPtoFqE6oRnlh-jI-zUhlFVFPUNm0XrrhmBsj63Gr83FcnmJ42OQ3XZlnf80AbB2doPl1wh29Njbbpz4G3yvNajgJ-PwdIVjzSjsg4N-FT6w7FscYDOAk2F0cIwOtOw8nPzqHL0_3L_dPSXPL4_Lu8VzIvOChKSRnCoG0JSskaTJSMV4UVdtVRSNBgoaWFnTXOeg2oZTkjWEl5y1WUFLHa9sjs53fQdn48Q-iI3xCrpO9tP4Ist5VvE6jyDbgcpZ7x1oMTizkW4rKBFTqmItplTFlKoguYgSTWe_3aVXstNO9sr4PyejnJXxRO52x0Fc9duAE14Z6BW0xsXMRGvNf9_8ACjCjjQ</recordid><startdate>20090701</startdate><enddate>20090701</enddate><creator>Fan, Qiaohui</creator><creator>Li, Zhan</creator><creator>Zhao, Haogui</creator><creator>Jia, Zehong</creator><creator>Xu, Junzheng</creator><creator>Wu, Wangsuo</creator><general>Elsevier B.V</general><general>Elsevier</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7QQ</scope><scope>8FD</scope><scope>JG9</scope></search><sort><creationdate>20090701</creationdate><title>Adsorption of Pb(II) on palygorskite from aqueous solution: Effects of pH, ionic strength and temperature</title><author>Fan, Qiaohui ; Li, Zhan ; Zhao, Haogui ; Jia, Zehong ; Xu, Junzheng ; Wu, Wangsuo</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a450t-ba71c2eeb62ba0b30827598d855bfe1efe26914f4ecdb7103b07672d3516f3513</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2009</creationdate><topic>Adsorption</topic><topic>Earth sciences</topic><topic>Earth, ocean, space</topic><topic>Exact sciences and technology</topic><topic>Lead</topic><topic>Mineralogy</topic><topic>Palygorskite</topic><topic>Silicates</topic><topic>Surface complexation</topic><topic>XPS</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Fan, Qiaohui</creatorcontrib><creatorcontrib>Li, Zhan</creatorcontrib><creatorcontrib>Zhao, Haogui</creatorcontrib><creatorcontrib>Jia, Zehong</creatorcontrib><creatorcontrib>Xu, Junzheng</creatorcontrib><creatorcontrib>Wu, Wangsuo</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Ceramic Abstracts</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><jtitle>Applied clay science</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Fan, Qiaohui</au><au>Li, Zhan</au><au>Zhao, Haogui</au><au>Jia, Zehong</au><au>Xu, Junzheng</au><au>Wu, Wangsuo</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Adsorption of Pb(II) on palygorskite from aqueous solution: Effects of pH, ionic strength and temperature</atitle><jtitle>Applied clay science</jtitle><date>2009-07-01</date><risdate>2009</risdate><volume>45</volume><issue>3</issue><spage>111</spage><epage>116</epage><pages>111-116</pages><issn>0169-1317</issn><eissn>1872-9053</eissn><coden>ACLSER</coden><abstract>Palygorskite was characterized by XRD, FTIR and acid–base titration. The fitting of surface charge density using FITEQL resulted in an excellent fitting of experimental data and following intrinsic equilibrium constants: log
K
XH
=
2.08, log
K
AL–OH
2
+
int
=
5.46, and log
K
Al–O
−
int
=
−
8.58. The total density of
Al–OH and
XNa were 9.76
×
10
−
5
mol/g and 1.36
×
10
−
4
mol/g, respectively. The adsorption of Pb(II) from aqueous solution on palygorskite was studied as a function of pH, ionic strength and temperature. Adsorption of Pb(II) on palygorskite was strongly dependent on pH, and weakly dependent on ionic strength. Two different adsorption mechanisms were proposed: (1) exchange reaction with little or no dependence on pH (i.e.,
X
2Pb
0
) at low pH; and (2) strong pH-dependent surface complexation reactions (
Al–OPb
+
) at neutral or alkaline conditions. The adsorption and desorption isotherms indicated that Pb(II) adsorption to palygorskite was reversible. The adsorption isotherms were simulated well by the Langmuir model. XPS analysis also indicated the adsorption species of Pb(II) to be
X
2Pb
0
at low pH and predominantly
Al–OPb
+
at higher pH.</abstract><cop>Kidlington</cop><pub>Elsevier B.V</pub><doi>10.1016/j.clay.2009.04.009</doi><tpages>6</tpages></addata></record> |
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| source | Elsevier ScienceDirect Journals Complete |
| subjects | Adsorption Earth sciences Earth, ocean, space Exact sciences and technology Lead Mineralogy Palygorskite Silicates Surface complexation XPS |
| title | Adsorption of Pb(II) on palygorskite from aqueous solution: Effects of pH, ionic strength and temperature |
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