Heterocoagulated clay-derived adsorbents for phosphate decontamination from aqueous solution.
Fangqun Gan1, Yufeng Luo2, Xiaoshuai Hang3
1Department of City Science, The City Vocational College of Jiangsu (Jiangsu Open University), Nanjing, 210017, China.
Journal of Environmental Management
|October 16, 2015
Summary
New nanocomposite adsorbents made from montmorillonite (Mt) and layered double hydroxide (LDH) show great potential for removing phosphate (P) from water. These LDH-Mt materials effectively capture phosphate, offering a promising solution for water purification.
Area of Science:
- Materials Science
- Environmental Chemistry
- Nanotechnology
Background:
- Phosphate (P) pollution in aquatic environments is a significant environmental concern, leading to eutrophication.
- Effective removal of phosphate from wastewater is crucial for maintaining water quality and ecosystem health.
- Developing novel adsorbents with high capacity and stability is essential for efficient phosphate remediation.
Purpose of the Study:
- To synthesize and characterize novel nanocomposite adsorbents using montmorillonite (Mt) and layered double hydroxide (LDH) via heterocoagulation.
- To evaluate the adsorption performance of these nanocomposites for phosphate removal from aqueous solutions.
- To investigate the influence of LDH loading, contact time, and pH on phosphate adsorption efficiency.
Main Methods:
- Nanocomposite adsorbents were prepared through the heterocoagulation of negatively charged delaminated montmorillonite and positively charged synthetic layered double hydroxide colloids.
- The mineralogy and physicochemical properties of the synthesized nanocomposites were characterized.
- Batch adsorption experiments were conducted to assess phosphate removal under varying conditions (P concentration, contact time, pH).
Main Results:
- The adsorption of phosphate onto the LDH-Mt nanocomposites followed both Freundlich and Langmuir isotherm models.
- Maximum adsorption capacities increased with higher LDH loadings, reaching up to 23.3 mg/g.
- Approximately 90% of phosphate adsorption was achieved within 1 hour, and the process was well-described by the pseudo-second-order kinetic model.
Conclusions:
- Heterocoagulation of Mt and LDH effectively preserves the phosphate adsorption capacity of LDH while enhancing the stability of both materials.
- The synthesized LDH-Mt nanocomposites demonstrate significant potential as efficient filtration media for phosphate removal.
- These findings highlight a promising approach for developing advanced materials for water treatment and pollution control.
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