Enhanced Phosphate Removal from Water by Honeycomb-Like Microporous Lanthanum-Chitosan Magnetic Spheres
The removal of phosphate in water is crucial and effective for control of eutrophication, and adsorption is one of the most effective treatment processes. In this study, microporous lanthanum-chitosan magnetic spheres were successfully synthetized and used for the removal of phosphate in water. The...
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doaj-a297e98a991c4b3195e933ea33c241152020-11-24T22:52:09ZengMDPI AGWater2073-44412018-11-011011165910.3390/w10111659w10111659Enhanced Phosphate Removal from Water by Honeycomb-Like Microporous Lanthanum-Chitosan Magnetic SpheresRong Cheng0Liang-Jie Shen1Ying-Ying Zhang2Dan-Yang Dai3Xiang Zheng4Long-Wen Liao5Lei Wang6Lei Shi7School of Environment and Natural Resources, Renmin University of China, Beijing 100872, ChinaSchool of Environment and Natural Resources, Renmin University of China, Beijing 100872, ChinaSchool of Environment and Natural Resources, Renmin University of China, Beijing 100872, ChinaSchool of Environment and Natural Resources, Renmin University of China, Beijing 100872, ChinaSchool of Environment and Natural Resources, Renmin University of China, Beijing 100872, ChinaNorthwest Institute of Nuclear Technology, Xi’an 710024, ChinaResearch Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100872, ChinaSchool of Environment and Natural Resources, Renmin University of China, Beijing 100872, ChinaThe removal of phosphate in water is crucial and effective for control of eutrophication, and adsorption is one of the most effective treatment processes. In this study, microporous lanthanum-chitosan magnetic spheres were successfully synthetized and used for the removal of phosphate in water. The characterization results show that the dispersion of lanthanum oxide is improved because of the porous properties of the magnetic spheres. Moreover, the contact area and active sites between lanthanum oxide and phosphate were increased due to the presence of many honeycomb channels inside the magnetic spheres. In addition, the maximum adsorption capacity of the Langmuir model was 27.78 mg P·g<sup>−1</sup>; and the adsorption kinetics were in good agreement with the pseudo-second-order kinetic equation and intra-particle diffusion model. From the results of thermodynamic analysis, the phosphate adsorption process of lanthanum-chitosan magnetic spheres was spontaneous and exothermic in nature. In conditional tests, the optimal ratio of lanthanum/chitosan was 1.0 mmol/g. The adsorption capacity of as-prepared materials increased with the augmentation of the dosage of the adsorbent and the decline of pH value. The co-existing anions, Cl<sup>−</sup> and NO<sub>3</sub><sup>−</sup> had little effect on adsorption capacity to phosphate, while CO<sub>3</sub><sup>2−</sup> exhibited an obviously negative influence on the adsorption capacity of this adsorbent. In general, owing to their unique hierarchical porous structures, high-adsorption capacity and low cost, lanthanum-chitosan magnetic spheres are potentially applicable in eutrophic water treatment.https://www.mdpi.com/2073-4441/10/11/1659porous structurelanthanumLa-chitosan magnetic spheresadsorption capacityphosphateadsorption isotherm |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Rong Cheng Liang-Jie Shen Ying-Ying Zhang Dan-Yang Dai Xiang Zheng Long-Wen Liao Lei Wang Lei Shi |
spellingShingle |
Rong Cheng Liang-Jie Shen Ying-Ying Zhang Dan-Yang Dai Xiang Zheng Long-Wen Liao Lei Wang Lei Shi Enhanced Phosphate Removal from Water by Honeycomb-Like Microporous Lanthanum-Chitosan Magnetic Spheres Water porous structure lanthanum La-chitosan magnetic spheres adsorption capacity phosphate adsorption isotherm |
author_facet |
Rong Cheng Liang-Jie Shen Ying-Ying Zhang Dan-Yang Dai Xiang Zheng Long-Wen Liao Lei Wang Lei Shi |
author_sort |
Rong Cheng |
title |
Enhanced Phosphate Removal from Water by Honeycomb-Like Microporous Lanthanum-Chitosan Magnetic Spheres |
title_short |
Enhanced Phosphate Removal from Water by Honeycomb-Like Microporous Lanthanum-Chitosan Magnetic Spheres |
title_full |
Enhanced Phosphate Removal from Water by Honeycomb-Like Microporous Lanthanum-Chitosan Magnetic Spheres |
title_fullStr |
Enhanced Phosphate Removal from Water by Honeycomb-Like Microporous Lanthanum-Chitosan Magnetic Spheres |
title_full_unstemmed |
Enhanced Phosphate Removal from Water by Honeycomb-Like Microporous Lanthanum-Chitosan Magnetic Spheres |
title_sort |
enhanced phosphate removal from water by honeycomb-like microporous lanthanum-chitosan magnetic spheres |
publisher |
MDPI AG |
series |
Water |
issn |
2073-4441 |
publishDate |
2018-11-01 |
description |
The removal of phosphate in water is crucial and effective for control of eutrophication, and adsorption is one of the most effective treatment processes. In this study, microporous lanthanum-chitosan magnetic spheres were successfully synthetized and used for the removal of phosphate in water. The characterization results show that the dispersion of lanthanum oxide is improved because of the porous properties of the magnetic spheres. Moreover, the contact area and active sites between lanthanum oxide and phosphate were increased due to the presence of many honeycomb channels inside the magnetic spheres. In addition, the maximum adsorption capacity of the Langmuir model was 27.78 mg P·g<sup>−1</sup>; and the adsorption kinetics were in good agreement with the pseudo-second-order kinetic equation and intra-particle diffusion model. From the results of thermodynamic analysis, the phosphate adsorption process of lanthanum-chitosan magnetic spheres was spontaneous and exothermic in nature. In conditional tests, the optimal ratio of lanthanum/chitosan was 1.0 mmol/g. The adsorption capacity of as-prepared materials increased with the augmentation of the dosage of the adsorbent and the decline of pH value. The co-existing anions, Cl<sup>−</sup> and NO<sub>3</sub><sup>−</sup> had little effect on adsorption capacity to phosphate, while CO<sub>3</sub><sup>2−</sup> exhibited an obviously negative influence on the adsorption capacity of this adsorbent. In general, owing to their unique hierarchical porous structures, high-adsorption capacity and low cost, lanthanum-chitosan magnetic spheres are potentially applicable in eutrophic water treatment. |
topic |
porous structure lanthanum La-chitosan magnetic spheres adsorption capacity phosphate adsorption isotherm |
url |
https://www.mdpi.com/2073-4441/10/11/1659 |
work_keys_str_mv |
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