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| Phosphate adsorption from solution by metal oxide nanoparticles and the potential on phosphate capture |
| LIANG Wen1, HE Wei1, LI Man-lin2, HUANG Hui1, Wang Jim J3, ZHANG Zeng-qiang1, LI Rong-hua1,4 |
1. College of Natural Resources and Environment, Northwest A & F University, Yangling 712100, China;
2. College of Science, Northwest A & F University, Yangling 712100, China;
3. School of Plant, Environmental and Soil Sciences, Louisiana State University Agricultural Center, Baton Rouge, LA 70803, USA;
4. Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, Yangling 712100, China |
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Abstract Effects of four different metal oxide nanoparticles (nMgO,nAl2O3,nTiO2 and nFe2O3) on phosphate adsorption were compared in the batch experiment.The influences of solution pH,contact time and coexist ions on phosphate adsorbed by nMgO were examined.Further,the phosphate adsorption mechanism onto nMgO was evaluated by XRD and XPS analysis.And the potential of recovered phosphate by nMgO from pig breeding wastewater on fertilzer was assessed by pot experiment.The results showed that nMgO had higher phosphate adsorption ability than nAl2O3,nTiO2 and nFe2O3.The phosphate amount reached 40、31.77、15.93 and 13.08mg/g in the range of pH 3.0 to 8.0 for nMgO,nAl2O3,nTiO2 and nFe2O3,respectively.The phosphate adsorption was a inreversible process.The phosphate sorption onto nMgO could reach equilibrium within 0.5h,the adsorption process fitted the pseudo-second order kinetic model.The equal content of coexisted F-,Cl-,NO3-,SO42-,Na+,K+ and NH4+ ions had no negative influence on phosphate adsorbed onto nMgO,while the existence of Mg2+ and Ca2+ ions could promote the phosphate adsorption.Langmuir model could be used to describe the adsorption isotherm,by which the maximum phosphate adsorption capacity was around 139.3mg/g.Based on the results of XRD and XPS analysis,it can be concluded that phosphate adsorption was dominated by chemical precipitation reaction combined with electrostatic attraction process.nMgO particles effectively recovered phosphate from piggery wastewater,in turn the phosphate loaded nMgO nanoparticle could be used as a potential substitute for phosphate-based fertilizer,which significantly improved the cabbage dry biomass from 0.31 to 0.96g/kg soil.
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Received: 21 November 2016
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