Synthesis, characterization and acid-base properties of kaolinite and metal (Fe, Mn, Co) doped kaolinite

Zhu, Bo-Li1; Qi, Chang-Lin1; Zhang, Yun-Hui1; Bisson, Teresa2; Xu, Zhenghe2,3; Fan, Ying-Ju1; Sun, Zhong-Xi1

2019-10

10.1016/j.clay.2019.105138

APPLIED CLAY SCIENCE   影响因子和分区

0169-1317

1872-9053

Pure kaolinite and metal ion doped kaolinite were synthesized successfully for the first time with different M/Al (M = Mn, Fe, Co) ratios (0, 0.042, 0.087, 0.19) at 220 degrees C by the hydrothermal method. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS) and BET techniques (N-2/BET) were used for sample characterization. XRD patterns of the products showed that kaolinite was the only crystalline phase synthesized and the lattice parameters varied systematically with metal content. The surface acid-base properties of the pure kaolinite and doped kaolinite were studied by potentiometric titration. Surface site concentration (Hs) and surface site density (Ds) increased as metal ion content in the metal doped kaolinite increased. The relevant acid-base equilibrium constants of synthesized products were calculated by applying the constant capacitance model using computer software WinSGW. The surface pKa values of synthetic kaolinite were calculated as: logKa(1) = 1.48; logKa(2) = -7.03. The results showed that a small number of metal ions significantly affect the surface acid-base properties of kaolinite, which may explain the origin of variability of the reported surface pKa values of kaolinite.

Kaolinite Metal ion doped kaolinite Acid-base properties Hydrothermal synthesis

SCI ; EI

英语

其他

National Basic Research Program of China[2011CB933700]

Chemistry ; Materials Science ; Mineralogy

Chemistry, Physical ; Materials Science, Multidisciplinary ; Mineralogy

WOS:000479025400006

ELSEVIER

20192307001512

Equilibrium constants ; Fourier transform infrared spectroscopy ; Hydrothermal synthesis ; Metal ions ; Metals ; Titration ; Voltammetry ; X ray diffraction ; X ray photoelectron spectroscopy

Minerals:482.2 ; Metallurgy:531.1 ; Chemistry:801 ; Electrochemistry:801.4.1 ; Chemical Reactions:802.2

GEOSCIENCES

Web of Science

1.Univ Jinan, Sch Chem & Chem Engn, Jinan 250022, Shandong, Peoples R China
2.Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 2G6, Canada
3.Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Guangdong, Peoples R China

Zhu, Bo-Li,Qi, Chang-Lin,Zhang, Yun-Hui,et al. Synthesis, characterization and acid-base properties of kaolinite and metal (Fe, Mn, Co) doped kaolinite[J]. APPLIED CLAY SCIENCE,2019,179.

Zhu, Bo-Li.,Qi, Chang-Lin.,Zhang, Yun-Hui.,Bisson, Teresa.,Xu, Zhenghe.,...&Sun, Zhong-Xi.(2019).Synthesis, characterization and acid-base properties of kaolinite and metal (Fe, Mn, Co) doped kaolinite.APPLIED CLAY SCIENCE,179.

Zhu, Bo-Li,et al."Synthesis, characterization and acid-base properties of kaolinite and metal (Fe, Mn, Co) doped kaolinite".APPLIED CLAY SCIENCE 179(2019).