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Kuang X, Li J, Ouyang Z, Huang H, Chen J, Chen X, Li L. Ca-Mg modified attapulgite for phosphate removal and its potential as phosphate-based fertilizer. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 357:120727. [PMID: 38555844 DOI: 10.1016/j.jenvman.2024.120727] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Revised: 02/27/2024] [Accepted: 03/19/2024] [Indexed: 04/02/2024]
Abstract
The urgent concerns of controlling water body eutrophication and the alleviating phosphorus shortage have led to an urgent need for action. The removal of phosphate from polluted waters and its reuse are essential for the prevention of eutrophication and for the sustainable utilization of phosphate resources. In this study, modified attapulgite with different Ca:Mg molar ratios was synthesized to facilitate the recovery of phosphate, with subsequent use of soil fertilizer. Ca-Mg modified attapulgite with the optimal ratio (ACM-5:3) exhibited an exceptional adsorption quality, achieving a maximum adsorption capacity of 63.2 mg/g. The pseudo-second-order model and Langmuir model could well describe the adsorption kinetics and isotherms, respectively. The adsorption mechanism analyses suggested that the interaction between ACM-5:3 and phosphate depended mainly on ion exchange and electrostatic attraction. Moreover, phosphate-laden-ACM-5:3 demonstrated a significant potential as a phosphorus-releasing fertilizer. It could promote corn growth by ensuring a continuous supply of phosphorus and minimizing phosphorus runoff losses. The above results suggested that ACM-5:3 was a potential adsorbent for efficient phosphate removal and recovery.
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Affiliation(s)
- Xiaotong Kuang
- School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan, 523808, PR China
| | - Jing Li
- School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan, 523808, PR China; Department of Chemical & Materials Engineering, University of Auckland, 0926, New Zealand
| | - Zhu Ouyang
- School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan, 523808, PR China
| | - Haiming Huang
- School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan, 523808, PR China.
| | - Jingjing Chen
- School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan, 523808, PR China
| | - Xingtong Chen
- School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan, 523808, PR China
| | - Linlong Li
- School of Environment and Civil Engineering, Dongguan University of Technology, Dongguan, 523808, PR China
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Han M, Shen X, Shao H, Liu Y, Han Q, Zhai Y. Facile one-pot hydrothermal synthesis of reticulated porous tobermorite for fast phosphorus recovery. Colloids Surf A Physicochem Eng Asp 2023. [DOI: 10.1016/j.colsurfa.2023.131349] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
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Liang H, Wang W, Liu H, Deng X, Zhang D, Zou Y, Ruan X. Porous MgO-modified biochar adsorbents fabricated by the activation of Mg(NO 3) 2 for phosphate removal: Synergistic enhancement of porosity and active sites. CHEMOSPHERE 2023; 324:138320. [PMID: 36905997 DOI: 10.1016/j.chemosphere.2023.138320] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Revised: 02/24/2023] [Accepted: 03/03/2023] [Indexed: 06/18/2023]
Abstract
Engineering magnesium oxide (MgO)-modified biochar (MgO-biochar) with high porosity and active MgO load is a feasible pathway to enhance phosphate adsorption capacity. However, the blockage to pores caused by MgO particles is ubiquitous during the preparation, which seriously impaired the enhancement in adsorption performance. In this research, with the intent to enhance phosphate adsorption, an in-situ activation method based on Mg(NO3)2-activated pyrolysis technology was developed to fabricate MgO-biochar adsorbents with abundant fine pores and active sites simultaneously. The SEM image revealed that the tailor-made adsorbent has well-developed porous structure and abundant fluffy MgO active sites. Its maximum phosphate adsorption capacity was coming up to 1809 mg/g. The phosphate adsorption isotherms are in accordance well with the Langmuir model. The kinetic data, which agreed with the pseudo-second-order model, indicated that chemical interaction is existing between phosphate and MgO active sites. This work verified that the phosphate adsorption mechanism on MgO-biochar was composed of protonation, electrostatic attraction, monodentate complexation and bidentate complexation. In general, the facile in-situ activation method using Mg(NO3)2 pyrolysis illuminated biochar activation with fine pores and highly efficient adsorption sites for efficient wastewater treatment.
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Affiliation(s)
- Hai Liang
- Dalian University of Technology, College of Chemical Engineering, Dalian, 116024, China; Liaoning Key Laboratory of Chemical Additive Synthesis and Separation, Yingkou Institute of Technology, Yingkou, 115014, Liaoning Province, China
| | - Wanting Wang
- Liaoning Key Laboratory of Chemical Additive Synthesis and Separation, Yingkou Institute of Technology, Yingkou, 115014, Liaoning Province, China
| | - Haiyan Liu
- Liaoning Key Laboratory of Chemical Additive Synthesis and Separation, Yingkou Institute of Technology, Yingkou, 115014, Liaoning Province, China.
| | - Xinzhong Deng
- Liaoning Key Laboratory of Chemical Additive Synthesis and Separation, Yingkou Institute of Technology, Yingkou, 115014, Liaoning Province, China
| | - Dan Zhang
- Liaoning Key Laboratory of Chemical Additive Synthesis and Separation, Yingkou Institute of Technology, Yingkou, 115014, Liaoning Province, China
| | - Yuxuan Zou
- Liaoning Key Laboratory of Chemical Additive Synthesis and Separation, Yingkou Institute of Technology, Yingkou, 115014, Liaoning Province, China
| | - Xuehua Ruan
- Dalian University of Technology, College of Chemical Engineering, Dalian, 116024, China.
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