Synthesis of hydrotalcite-like compounds with drinking water treatment residuals for phosphorus recovery from wastewater
| Autor: | Zhijie Liang, Peijin Huang, Zhiwei Zhao, Fuyi Cui |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Langmuir
Ion exchange Hydrotalcite Renewable Energy Sustainability and the Environment 020209 energy Strategy and Management Phosphorus 05 social sciences Inorganic chemistry Langmuir adsorption model chemistry.chemical_element 02 engineering and technology Building and Construction Industrial and Manufacturing Engineering symbols.namesake Adsorption Wastewater chemistry 050501 criminology 0202 electrical engineering electronic engineering information engineering symbols Water treatment 0505 law General Environmental Science |
| Zdroj: | Journal of Cleaner Production. 301:126976 |
| ISSN: | 0959-6526 |
| Popis: | Drinking water treatment residuals are the resources containing a large amount of alum and iron. Most of drinking water treatment residuals are directly landfilled without treatment, but it is a promising way to reuse them in the adsorption of pollutants. The composition of drinking water treatment residuals is of Al and/or Fe, thus our hypothesis is whether it is possible to synthesize hydrotalcite-like compounds from drinking water treatment residuals for phosphorus recovery. In this work, Mg–Al–Fe hydrotalcite-like compounds were successfully synthesized from DWTRs with double-drop method. By analyzing the structure of the materials synthesized under different conditions and their adsorption performance, pH = 9, M3+ rate = 0.45, Al: Fe = 1:1 and T = 333 K were selected as the synthesis conditions of materials for subsequent phosphate adsorption. Pseudo second-order model described the kinetic results better, and both Langmuir and Freundlich model fitted well with the experimental isotherm. The maximum adsorption capacity of 51.1 mg/g according to Langmuir model was higher than other similar materials, indicating the Mg–Al–Fe hydrotalcite-like compounds effectively adsorbed the phosphate. Finally, combined with the results of X-ray diffraction, scanning electron microscopy, Fourier transform infra-red and X-ray photoelectron spectroscopy before and after adsorption, the phosphate adsorption mechanism included physical adsorption, surface complexation, ion exchange and surface chemical precipitation. It concluded that Mg–Al–Fe hydrotalcite-like compound fabrication is a potential way to simultaneously achieve the aim of drinking water treatment residuals utilization and phosphorus recovery. |
| Databáze: | OpenAIRE |
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