Sedimentation field-flow fractionation for characterization of citric acid-modified Hβ zeolite particles: Effect of particle dispersion and carrier composition.
In this study, sedimentation field-flow fractionation (SdFFF) was, for the first time, applied for determination of size distribution of Hβ zeolite particles modified by citric acid (CA-Hβ). Effects of the particle dispersion and the carrier liquid composition (type of dispersing reagent (surfactant) and salt added in the carrier liquid, ionic strength, and pH) on SdFFF elution behavior of CA-Hβ zeolite particles were systematically investigated. Also the SdFFF separation efficiency of the particles was discussed in terms of the forces such as van der Waals, hydrophobic, and induced-dipole interactions. Results reveal that the type of salt and pH of the carrier liquid significantly affect the SdFFF separation efficiency of the zeolite particles. It was found that addition of a salt (NaN3) into the carrier liquid affects the characteristic of the SdFFF channel surface. It was found that the use of an acidic medium (pH 3.2) leads to a particle-channel interaction, while the use of a basic medium (pH 10.6) promotes an inter-particle hydrophobic interaction. Result from SdFFF was compared with those from scanning electron microscopy (SEM) and dynamic light scattering (DLS). It seems that, once the experimental conditions are optimized, SdFFF becomes a valuable tool for size characterization of the zeolite particles.
School of Medicine, Hebei University, Baoding 071002, China; Department of Chemistry, Hannam University, Daejeon 305811, Republic of Korea. Electronic address: douhaiyang-1984@163.com.
Haiyang
H
Dou
College of Chemistry and Environmental Science, Hebei University, Baoding 071002, China.
Guoyi
G
Bai
School of Medicine, Hebei University, Baoding 071002, China.
Liang
L
Ding
School of Medicine, Hebei University, Baoding 071002, China.
Yueqiu
Y
Li
Department of Chemistry, Hannam University, Daejeon 305811, Republic of Korea. Electronic address: slee@hnu.kr.
Seungho
S
Lee
D019343:Citric Acid / Q000737:chemistry*; D031521:Fractionation, Field Flow / Q000379:methods*; D006863:Hydrogen-Ion Concentration; D008855:Microscopy, Electron, Scanning; D009994:Osmolar Concentration; D010316:Particle Size; D017641:Zeolites / Q000737:chemistry*
D017641:Zeolites; D019343:Citric Acid
Carrier liquid composition; Hβ zeolite particle; Interaction; Sample dispersion; Sedimentation field-flow fractionation