Journal article
Coating of silica sand with aluminosilicate clay
Journal of colloid and interface science, Vol.294(1), pp.155-164
2006
Handle:
https://hdl.handle.net/2376/114618
PMID: 16085082
Abstract
The objective of this work was to coat aluminosilicate clays on an inert silica support, and to characterize the properties and stability of the clay–silica coating. Two polymers, polyacrylamide (PAM) and polyvinyl alcohol (PVA), were used to bind kaolinite, illite, and smectite onto silica grains. The clay–polymer composites were studied by X-ray diffraction, FTIR, and electrophoretic mobility. Clay coatings on silica grains were characterized by mass coverage, scanning electron microscopy, specific surface area, and pH stability. Silica sand was successfully coated with clays by using the two polymers, but with PVA, the clay coating had a greater mass coverage and was more stable against pH variations. Less polymer was needed for the clay coating using PVA as compared to using PAM. Clay–polymer complexes and pure clay minerals had similar cation exchange capacities and electrophoretic mobilities, indicating that overall surface charge of the clays was little affected by the polymers. Some decrease in hydrophilicity was observed for illite and smectite when clays where coated with the polymers. The methodology reported here allows the generation of a clay-based porous matrix, with hydraulic properties that can be varied by adjusting the grain size of the inert silica support.
Metrics
5 Record Views
Details
- Title
- Coating of silica sand with aluminosilicate clay
- Creators
- Jorge Jerez - Department of Biological Systems Engineering, Washington State University, Pullman, WA 99164, USAMarkus Flury - Department of Biological Systems Engineering, Washington State University, Pullman, WA 99164, USAJianying Shang - Department of Crop and Soil Sciences, Center for Multiphase Environmental Research, Washington State University, Pullman, WA 99164, USAYoujun Deng - Department of Crop and Soil Sciences, Center for Multiphase Environmental Research, Washington State University, Pullman, WA 99164, USA
- Publication Details
- Journal of colloid and interface science, Vol.294(1), pp.155-164
- Academic Unit
- Crop and Soil Sciences, Department of
- Publisher
- Elsevier Inc
- Identifiers
- 99900547439201842
- Language
- English
- Resource Type
- Journal article