1. Preparation of Fe-filled MOF-Al-based hydrogel for efficient reclaim of phosphate from wastewater and reusing as a slow-release fertilizer
- Author
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Zhengxian Wang, Jiankang Lu, and Chengyi Wu
- Subjects
Thermogravimetric analysis ,Materials science ,Scanning electron microscope ,0208 environmental biotechnology ,02 engineering and technology ,010501 environmental sciences ,engineering.material ,Wastewater ,01 natural sciences ,Phosphates ,chemistry.chemical_compound ,Soil ,Biochar ,Environmental Chemistry ,Fertilizers ,Waste Management and Disposal ,0105 earth and related environmental sciences ,Water Science and Technology ,Phosphate adsorption ,Hydrogels ,General Medicine ,Hydrogen-Ion Concentration ,Phosphate ,020801 environmental engineering ,Kinetics ,chemistry ,Chemical engineering ,engineering ,Fertilizer ,Adsorption ,Water Pollutants, Chemical - Abstract
In this study, a novel Fe-filled MOF-Al-based hydrogel (SA@Fe@MOF-Al) was prepared and characterized by X-ray diffraction, scanning electron microscopy, thermogravimetric analysis. The SA@Fe@MOF-Al hydrogel bead was used as an adsorbent to adsorb H2PO4− from wastewater. The effects on adsorption were investigated, including pH and coexist ion. The adsorption reached equilibrium within 30 min. The maximum H2PO4− adsorption capacity of SA@Fe@MOF-Al was 103.09 mg g−1 at 298K with pH 7.0. Meanwhile, thermodynamic results confirmed that adsorption is exothermic and spontaneous. The adsorption kinetics displayed that SA@Fe@MOF-Al adsorption process was suitable to the pseudo-first-order and Langmuir model. Moreover, the feasibility of reusing the P-laden carrier material as a slow-release fertilizer was determined. The study results indicated that the product demonstrated excellent slow-release and water-retention properties. Thus, it has potential applications in improving soil moisture content and reducing soil moisture evaporation rate.
- Published
- 2021