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Surface mole-ratio method to distinguish surface precipitation and adsorption on solid-liquid interface
Jinshan Wei1, Xiaoguang Meng2, Yonghui Song3
1State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, China.
Journal of Hazardous Materials
|May 11, 2020
Summary
A new surface mole-ratio (SMR) method distinguishes lead (Pb) precipitation from adsorption on acrylic amine fiber. This method reveals Pb precipitates first, followed by adsorption, aiding heavy metal removal studies.
Area of Science:
- Environmental Science
- Materials Science
- Analytical Chemistry
Background:
- Phosphate enhances lead removal by adsorbents via co-adsorption, ternary complexes, or precipitation.
- Distinguishing adsorption from surface precipitation in multi-adsorbate systems is challenging.
Purpose of the Study:
- To establish and apply a novel surface mole-ratio (SMR) method for delineating lead-phosphate precipitation and lead adsorption on acrylic amine fiber (AAF).
Main Methods:
- Developed Pb removal experiments using AAF with varying Pb and phosphate concentrations.
- Applied the SMR method by plotting removed Pb/P ratio against equilibrium Pb concentration.
- Utilized FTIR, SEM-EDX, and XRD for further confirmation.
Main Results:
- The SMR diagram revealed a turning point at a Pb/P mole ratio of 5/3, characteristic of pyromorphite precipitate.
- Indicated that Pb precipitation occurs first, followed by Pb adsorption after all phosphate is consumed.
- Confirmed precipitation and adsorption mechanisms through complementary analyses.
Conclusions:
- The SMR method effectively differentiates Pb precipitation from adsorption on AAF.
- This method has broad applications for understanding multi-adsorbate removal and heavy metal stabilization.
- Future integration with in-situ techniques will enhance SMR method efficacy.
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