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Wang Z, Zhu G, Zhou Y, Wen Z, Wu D. Lanthanum-modified tobermorite synthesized from fly ash for efficient phosphate removal. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:29584-29594. [PMID: 38580876 DOI: 10.1007/s11356-024-33153-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/21/2023] [Accepted: 03/27/2024] [Indexed: 04/07/2024]
Abstract
Phosphate removal from water by lanthanum-modified tobermorite synthesized from fly ash (LTFA) with different lanthanum concentrations was studied. LTFA samples were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy, and Brunauer‒Emmett‒Teller specific surface area analysis. The results showed that the LTFA samples were mainly composed of mesoporous tobermorite-11 Å, and LTFA1 with a lanthanum concentration of 0.15 M had a high specific surface area (83.82 m2/g) and pore volume (0.6778 cm3/g). The phosphate adsorption capacities of LTFA samples were highest at pH 3 and gradually decreased with increasing pH. The phosphate adsorption kinetics data on LTFA samples were most accurately described by the Elovich model. The adsorption isotherms were in the strongest agreement with the Temkin model, and LTFA1 showed the highest phosphate adsorption capacity (282.51 mg P/g), which was higher than that of most other lanthanum-modified adsorbents. LTFA1 presented highly selective adsorption of phosphate with other coexisting ions (HCO3-, Cl-, SO42-, and NO3-). In addition, phosphate was adsorbed onto LTFA samples by forming inner-sphere phosphate complexes and amorphous lanthanum phosphate. This study provides technical support for development of efficient fly ash-based phosphate adsorbents.
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Affiliation(s)
- Zehua Wang
- School of Resources and Environment, Nanchang University, Nanchang, 330031, China.
| | - Guanyu Zhu
- School of Resources and Environment, Nanchang University, Nanchang, 330031, China
| | - Yongwei Zhou
- School of Resources and Environment, Nanchang University, Nanchang, 330031, China
| | - Zhencheng Wen
- School of Resources and Environment, Nanchang University, Nanchang, 330031, China
| | - Daishe Wu
- School of Materials and Chemical Engineering, Pingxiang University, Pingxiang, 337000, China
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2
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Cakmak EK, Hartl M, Kisser J, Cetecioglu Z. Phosphorus mining from eutrophic marine environment towards a blue economy: The role of bio-based applications. WATER RESEARCH 2022; 219:118505. [PMID: 35561625 DOI: 10.1016/j.watres.2022.118505] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2021] [Revised: 03/13/2022] [Accepted: 04/21/2022] [Indexed: 06/15/2023]
Abstract
Global phosphorus reserves are under pressure of depletion in the near future due to increased consumption of primary phosphorus reservoirs and improper management of phosphorus. At the same time, a considerable portion of global marine water bodies has been suffering from eutrophication due to excessive nutrient loading. The marine environment can be considered as a valuable phosphorus source due to nutrient rich eutrophic seawater and sediment which could potentially serve as phosphorus mines in the near future. Hence, sustainable phosphorus recovery strategies should be adapted for marine systems to provide phosphorus for the growing market demand and simultaneously control eutrophication. In this review, possible sustainable strategies for phosphorus removal and recovery from marine environments are discussed in detail. Bio-based strategies relying on natural phosphorus uptake/release metabolism of living organisms are suggested as promising options that can provide both phosphorus removal and recovery from marine waters for achieving a sustainable marine ecosystem. Among them, the utilization of microorganisms seems promising to develop novel strategies. However, the research gap for the technical applicability of these strategies is still considerably big. Therefore, future research should focus on the technical development of the strategies through laboratory and/or field studies. Coupling phosphorus mining with other valorisation pathways (i.e., metal recovery, energy production) is also suggested to improve overall sustainability and economic viability. Environmental, economic and societal challenges should altogether be well addressed prior to real scale applications.
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Affiliation(s)
- Ece Kendir Cakmak
- Department of Environmental Engineering, Hacettepe University, 06800 Ankara, Turkey; Department of Industrial Biotechnology, KTH Royal Institute of Technology, AlbaNova University Center, SE-11421 Stockholm, Sweden
| | - Marco Hartl
- alchemia-nova GmbH, Baumgartenstrasse 93, 1140 Vienna, Austria
| | - Johannes Kisser
- alchemia-nova GmbH, Baumgartenstrasse 93, 1140 Vienna, Austria
| | - Zeynep Cetecioglu
- Department of Industrial Biotechnology, KTH Royal Institute of Technology, AlbaNova University Center, SE-11421 Stockholm, Sweden.
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3
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Kang L, Mucci M, Lürling M. Influence of temperature and pH on phosphate removal efficiency of different sorbents used in lake restoration. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 812:151489. [PMID: 34742988 DOI: 10.1016/j.scitotenv.2021.151489] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 11/02/2021] [Accepted: 11/02/2021] [Indexed: 06/13/2023]
Abstract
Phosphorus sorbents (PS) are viewed as a powerful tool to manage eutrophication. Here, we tested three commercially available PS - lanthanum-modified bentonite (LMB), aluminium-modified zeolite (AMZ) and aluminium salts (Al) on their capacity to chemically inactivate soluble reactive phosphorus (SRP) at six different temperatures (5 to 35 °C) and five pH values (6 to 10). We also evaluated if the SRP bound at a neutral pH would be released if pH increases to pH 10. Results showed that temperature affected the SRP binding behavior differently for each PS. For instance, the highest SRP binding capacities of LMB, AMZ and Al were 14.0, 29.9 and 251.1 mg P g-1 at 30 °C, 35 °C and 30 °C, respectively; and the lowest was at 35 °C for LMB, 25 °C for AMZ and 20 °C for Al (6.3, 4.0 and 205.2 mg P g-1, respectively). The pH also affected the SRP binding differently. When pH increased from pH 6 to pH 10, LMB and Al decreased their binding capacity from 10.0 to 4.9 and from 571.7 mg P g-1 to 21.3 mg P g-1, respectively. The SRP adsorption capacity of AMZ was similar at pH 7 and 10 (6.3 and 6.2 mg P g-1). We observed that in high pH, LMB did not release the SRP precipitated. In contrast, AMZ and Al desorbed around 39%, and 71% of the SRP adsorbed when pH changed from 7 to 10. Abiotic factors such as pH should be considered when selecting the most promising material in lake restoration.
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Affiliation(s)
- Li Kang
- Aquatic Ecology & Water Quality Management Group, Department of Environmental Sciences, Wageningen University, P.O. Box 47, 6700 AA Wageningen, the Netherlands.
| | - Maíra Mucci
- Aquatic Ecology & Water Quality Management Group, Department of Environmental Sciences, Wageningen University, P.O. Box 47, 6700 AA Wageningen, the Netherlands
| | - Miquel Lürling
- Aquatic Ecology & Water Quality Management Group, Department of Environmental Sciences, Wageningen University, P.O. Box 47, 6700 AA Wageningen, the Netherlands
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Wu P, Wang N, Zhu L, Lu Y, Fan H, Lu Y. Spatial-temporal distribution of sediment phosphorus with sediment transport in the Three Gorges Reservoir. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 769:144986. [PMID: 33477048 DOI: 10.1016/j.scitotenv.2021.144986] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2020] [Revised: 12/13/2020] [Accepted: 01/02/2021] [Indexed: 06/12/2023]
Abstract
Suspended sediment is an important phosphorus (P) adsorption medium in river catchments. Early adsorption isotherm models often ignored sediment heterogeneity, resulting in incorrect sediment P estimates in field environments. In the Three Gorges Reservoir (TGR), China, P load assessment is essential to eutrophication risk management, but the sediment P evolution in the TGR is unclear. Herein, the P-adsorption capacity of suspended sediment was estimated with an improved Langmuir model via sediment parameter consideration, and the long-term distribution and variations in simulated sediment P with sediment transport were assessed from 2003- 2016. The results showed that the improved Langmuir model attained a good fit with experimental and field data. The sediment load entering the TGR significantly decreased, especially the median size (D50) fraction smaller than 0.008 mm, resulting in long-term discharged sediment load decline and annual mean D50 increase. Meanwhile, the annual sediment P load in the TGR decreased from 7.46- 22.38 kg/s in 2003 to 1.74- 4.73 kg/s in 2016. The increasing sediment particle size reduced the sediment P load and was sensitive to the low sediment P load in the regular impoundment stage (September 2008- 2016). The flood season (June-September) transported 69.2- 98.6% of the annual sediment P. Around 62.3% of total sediment P load was retained in the TGR from 2003- 2016. The results revealed that the retention role of the Three Gorges Dam (TGD) facilitated the long-term reduction in fine sediment and sediment P in the TGR downstream. This study highlights the importance of the particle size in P-adsorption capacity estimation with suspended sediment transport.
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Affiliation(s)
- Pan Wu
- State Key Laboratory of Hydrology, Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China
| | - Nairu Wang
- State Key Laboratory of Hydrology, Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China
| | - Lijun Zhu
- State Key Laboratory of Hydrology, Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China
| | - Yongjun Lu
- State Key Laboratory of Hydrology, Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China.
| | - Hongxia Fan
- State Key Laboratory of Hydrology, Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China
| | - Yan Lu
- State Key Laboratory of Hydrology, Water Resources and Hydraulic Engineering, Nanjing Hydraulic Research Institute, Nanjing 210029, China
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Adsorptive removal of phosphate by a Fe–Mn–La tri-metal composite sorbent: Adsorption capacity, influence factors, and mechanism. ADSORPT SCI TECHNOL 2020. [DOI: 10.1177/0263617420942709] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Reducing input of phosphorus is the key step for control of eutrophication and algal blooming in freshwater lakes. Adsorption technology is a cost-effective technology for phosphate removal in water for the purpose. Thus, in this study, a novel Fe–Mn–La tri-metal composite sorbent was developed, and then evaluated for phosphate removal. The results showed that the maximum adsorption capacity could be approached to 61.80 mg g−1 at 25°C under pH of 6.03. Adsorption of phosphate by Fe–Mn–La tri-metal composite adsorbent fitted better by pseudo-second-order kinetic equation and Langmuir model, which suggested that the adsorption process was surface chemical reactions and mainly in a monolayer coverage manner. The thermodynamic study indicated that the adsorption reaction was an endothermic process. The phosphate removal gradually decreased with the increasing of pH from 3.02 to 11.00. The sequence of coexisting anions competing with phosphates was that CO32− > Cl− > SO42− > NO3−. Dissolved organic matter, fulvic acid as a representative, would also decrease adsorption capacities of phosphate by Fe–Mn–La tri-metal composite adsorbents. Adsorption capacity would be decreased with increasing addition of adsorbents, while removal efficiency would be increased in this process. The Fe–Mn–La tri-metal composite adsorbent showed a good reusability when applied to removal of dissolved phosphate from aqueous solutions. The Fourier transform infrared spectrometer and X-ray photoelectron spectroscopy analyses indicated that some hydroxyl groups (–OH) on the surface of adsorbent were replaced by the adsorbed PO43−, HPO42−, or H2PO4−. Aggregative results showed that the novel Fe–Mn–La tri-mental composite sorbent is a very promising adsorbent for the removal of phosphate from aqueous solutions.
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Mucci M, Douglas G, Lürling M. Lanthanum modified bentonite behaviour and efficiency in adsorbing phosphate in saline waters. CHEMOSPHERE 2020; 249:126131. [PMID: 32058135 DOI: 10.1016/j.chemosphere.2020.126131] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/11/2019] [Revised: 02/03/2020] [Accepted: 02/04/2020] [Indexed: 06/10/2023]
Abstract
Lanthanum-modified bentonite (LMB, commercially called Phoslock®) has been widely applied in freshwater systems to manage eutrophication. Little is known, however, about its behaviour and efficiency in binding filterable reactive phosphorus (FRP) in saline environments. We assessed if LMB would adsorb phosphate over a range of salinities (0-32 ppth) comparing the behaviour in seawater salts and equivalent concentrations of NaCl. Lanthanum release from the bentonite matrix was measured and the La species prevailing in saline environments were evaluated through chemical equilibrium modelling. We demonstrated that LMB was able to adsorb FRP in all the salinities tested. Filterable lanthanum (FLa) concentrations were similarly low (<5 μgL-1) at all seawater salinities but considerably elevated, on occasion >2000 times greater in equivalent NaCl salinities. Mineralogical analysis indicates that La present in the clay interlayer was (partially) replaced by Na/Ca/Mg present in the seawater and a possible secondary P-reactive phase was formed, such as kozoite (LaCO3OH) or lanthanite (La2(CO3)3·8H2O) that may be physically dissociated from the LMB. Geochemical modelling also indicates that most FLa dissociated from LMB would be precipitated as a carbonate complex. In light of the identification of reactive intermediate phases, further studies including ecotoxicologial assays are required to assess any deleterious effects from the application of LMB to saline waters.
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Affiliation(s)
- Maíra Mucci
- Aquatic Ecology & Water Quality Management Group, Department of Environmental Sciences, Wageningen University and Research, P.O. Box 47, 6700, AA, Wageningen, the Netherlands.
| | - Grant Douglas
- CSIRO Land and Water, Centre for Environment and Life Sciences, Floreat, WA, Australia
| | - Miquel Lürling
- Aquatic Ecology & Water Quality Management Group, Department of Environmental Sciences, Wageningen University and Research, P.O. Box 47, 6700, AA, Wageningen, the Netherlands; Department of Aquatic Ecology, Netherlands Institute of Ecology (NIOO-KNAW), P.O. Box 50, 6700, AB, Wageningen, the Netherlands
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7
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Letshwenyo MW, Sima TV. Phosphorus removal from secondary wastewater effluent using copper smelter slag. Heliyon 2020; 6:e04134. [PMID: 32577557 PMCID: PMC7303565 DOI: 10.1016/j.heliyon.2020.e04134] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Revised: 05/16/2020] [Accepted: 06/01/2020] [Indexed: 11/29/2022] Open
Abstract
This study investigated the use of copper smelter slag for the removal of phosphorus from secondary wastewater effluent through batch tests. The media was physically and chemically characterized and showed presence of Fe2O3 (45.22%), SiO2 (14.98%), Al2O3 (3.21%), CaO (1.99%), SO3 (1.77%) and MgO (1.33%). Scanning electron microscopy monographs revealed smooth and flat surface and no heterogeneity on the surface of the slag with visible micro pores before the experiment and less visible after the experiment. The point of zero charge of the media was 5.0. Equilibrium was reached after 4 h at 29.5 ± 0.71% phosphorus removal efficiency and media dosage of 0.4/100 mL. The kinetic data was best described by Pseudo second order equation. More than one mechanisms were involved in the adsorption of phosphorus onto copper smelter slag as suggested by multi-linearity of intra particle diffusion model. Ninety seven percent (97.5 ± 0.0%) removal efficiency was achieved at an equilibrium dosage of 160 gL-1. The equilibrium isotherm was described better by Langmuir equation with observed maximum adsorption capacity of 0.16 mg P g-1 media and the experimental maximum adsorption capacity was 0.26 mg P g-1 media. Regeneration studies showed low performance with maximum efficiency of 11.7% revealed during the first regeneration trial therefore low practical benefits. Copper smelter slag is a poor adsorbent for phosphorus and further studies on the media should be conducted.
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Affiliation(s)
- Moatlhodi Wise Letshwenyo
- Botswana International University of Science and Technology, Faculty of Engineerimg and Technology, Department of Civil and Environmental Engineering, Private Bag 16, Palapye, Botswana
| | - Thandie Veronicah Sima
- Botswana International University of Science and Technology, Faculty of Engineerimg and Technology, Department of Civil and Environmental Engineering, Private Bag 16, Palapye, Botswana
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8
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Xu X, Wang B, Tang H, Jin Z, Mao Y, Huang T. Removal of phosphate from wastewater by modified bentonite entrapped in Ca-alginate beads. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2020; 260:110130. [PMID: 31941638 DOI: 10.1016/j.jenvman.2020.110130] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Revised: 11/15/2019] [Accepted: 01/11/2020] [Indexed: 05/28/2023]
Abstract
Methods of removing phosphate from wastewater with a low phosphate concentration are of great environmental significance. In this study, immobilized beads were prepared by entrapping modified bentonite powder in calcium-alginate (Al-NaBT-CA), and the potential of the beads for phosphate removal from wastewater was investigated. The effects of pH (1-10) and initial phosphate concentration (0.5-50 mg/L) were also examined in batch experiments with Al-NaBT-CA beads. The optimum pH value for phosphate removal by Al-NaBT-CA beads was pH 3. In addition, a high initial phosphate concentration promoted phosphate adsorption. Adsorption kinetics showed that the adsorption of phosphate using beads followed a pseudo-second-order kinetic model (R2 = 0.98-0.99). The adsorption isotherm data was well fitted by the Sips adsorption model. The maximum phosphate adsorption capacity of the Al-NaBT-CA beads was 15.77 mg/g, which was slightly less than that of the modified powder. The specific surface area of the Al-NaBT-CA beads was 17.01 m2/g, and their average pore size was 13.41 nm. Scanning electron microscopy suggested that the high inner porosity and rough outer surface of the beads facilitated phosphate transfer.
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Affiliation(s)
- Xiaoyi Xu
- School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou, 215009, China
| | - Bin Wang
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, China
| | - Hui Tang
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, China
| | - Zhaoxia Jin
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, China
| | - Yulan Mao
- Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing, 400045, China
| | - Tianyin Huang
- School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou, 215009, China
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Wang C, Liu Z, Zhang Y, Liu B, Zhou Q, Zeng L, He F, Wu Z. Synergistic removal effect of P in sediment of all fractions by combining the modified bentonite granules and submerged macrophyte. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 626:458-467. [PMID: 29358138 DOI: 10.1016/j.scitotenv.2018.01.093] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Revised: 01/10/2018] [Accepted: 01/10/2018] [Indexed: 06/07/2023]
Abstract
The removal efficiency of sediment phosphorus (P) with the in-situ synergistic effect of modified bentonite granules (MBG) and Vallisneria spiralis (V. spiralis) in West Lake, Hangzhou, China was investigated for the first time in the study. CMBG-Na10-450 (nitrification (10% Na2CO3)-calcination (450 °C) combined modification) was prepared and characterized, and the removal effects of sediment P of all fractions with CMBG-Na10-450 and V. spiralis in combination and separately were evaluated in batch experiments. Results showed that CMBG-Na10-450 could promote the growth of V. spiralis, and the residual P of the sediment not adsorbed on CMBG-Na10-450 was changed through root oxygenation and nutrition allocation, and then enhanced the extra P adsorption on CMBG-Na10-450. The combination of MBG and V. spiralis exhibited a synergistic removal effect higher than the summation of MBG and V. spiralis applied separately. The results of microcosm experiments showed that the combination of CMBG-Na10-450 and V. spiralis enhanced the function of P metabolism by increasing the special genus that belongs to the family Erysipelotrichaceae.
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Affiliation(s)
- Chuan Wang
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Zisen Liu
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yi Zhang
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China.
| | - Biyun Liu
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Qiaohong Zhou
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Lei Zeng
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Feng He
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Zhenbin Wu
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
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10
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Fang L, Liu R, Li J, Xu C, Huang LZ, Wang D. Magnetite/Lanthanum hydroxide for phosphate sequestration and recovery from lake and the attenuation effects of sediment particles. WATER RESEARCH 2018; 130:243-254. [PMID: 29232636 DOI: 10.1016/j.watres.2017.12.008] [Citation(s) in RCA: 95] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2017] [Revised: 12/04/2017] [Accepted: 12/05/2017] [Indexed: 05/12/2023]
Abstract
An effective approach for eutrophication control and phosphate recovery remains a longstanding challenge. Herein, we present a new technique for phosphate sequestration in lake and phosphate recovery using novel magnetically recoverable magnetite/lanthanum hydroxide [M-La(OH)3] hybrids that can be prepared using a simple one-pot synthesis method. Batch studies show that M-La(OH)3 exhibits a strong sorption towards phosphate with sorption capacities of up to 52.7 mg-P/g at pH 7.0 in water. A simple model indicates that the efficiency of M-La(OH)3 for phosphate sequestration in lake is significantly attenuated by 34-45% compared to that in water, due to interference from sediment particles. However, our results demonstrate that sediments suspensions mixed with a M-La(OH)3 content of 1-3% exhibit a capability of up to 1.2 mg-P/g for sequestering external phosphate compared with that of 0.2 mg-P/g for pristine sediment at pH 7.3. M-La(OH)3-mixed sediment suspensions appear to effectively sequester phosphate over an environmentally relevant pH range from 4 to 8.5. Phosphorus (P) fractionation experiments indicate that the enhanced phosphate sorption by M-La(OH)3-mixed sediment suspensions is mainly due to the increased fractions of NaOH-P and inorganic P. This work indicates that the M-La(OH)3 has the potential for phosphate sequestration and recovery from lake.
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Affiliation(s)
- Liping Fang
- Faculty of Material Science and Chemistry, China University of Geosciences, No. 388, Lumo Road, Wuhan, 430074, China.
| | - Ru Liu
- Faculty of Material Science and Chemistry, China University of Geosciences, No. 388, Lumo Road, Wuhan, 430074, China
| | - Ji Li
- Faculty of Material Science and Chemistry, China University of Geosciences, No. 388, Lumo Road, Wuhan, 430074, China
| | - Cuihong Xu
- Faculty of Material Science and Chemistry, China University of Geosciences, No. 388, Lumo Road, Wuhan, 430074, China
| | - Li-Zhi Huang
- School of Civil Engineering, Wuhan University, No. 8, East Lake South Road, Wuhan, China; Interdisciplinary Nanoscience Center (iNANO), Aarhus University, Gustav Wieds Vej 14, DK-8000, Aarhus C, Denmark.
| | - Dongsheng Wang
- State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
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11
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Fang L, Wu B, Chan JKM, Lo IMC. Lanthanum oxide nanorods for enhanced phosphate removal from sewage: A response surface methodology study. CHEMOSPHERE 2018; 192:209-216. [PMID: 29102865 DOI: 10.1016/j.chemosphere.2017.10.154] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Revised: 10/26/2017] [Accepted: 10/27/2017] [Indexed: 06/07/2023]
Abstract
Lanthanum-based adsorbents are ideal candidates for phosphate removal because of their excellent affinity to phosphate. However, their application in the removal of trace-levels of phosphate from sewage is still unsatisfactory due to the limited adsorption capacity and inadequate optimization of the operational parameters. To overcome these drawbacks, we have developed a novel lanthanum hydroxide (LH), using a facile precipitation and hydrothermal process that involves a nanorod-like structure with the lengths ranging from 124 to 1700 nm, depending on the La/OH molar ratio. The phosphate adsorption capacity of the developed LH is up to 170.1 mg-P g-1 in synthetic water, while a slightly lower adsorption capacity of 111.1 mg-P g-1 is observed in a sewage sample. A polynominal model consisting of three variables (i.e. dosage, reaction time and initial phosphate concentration) for predicting efficiency of phosphate removal has been successfully developed using a face-centred central composite design (CCD)-based methodology. The results also suggest a strong interactive effect of the dosage with the phosphate concentration, and reaction time, which can significantly affect the optimization of the phosphate removal by LH. Both X-ray photoelectron spectroscopy and X-ray diffraction studies indicate that the inner sphere complexation of phosphate with LH is probably the major mechanism governing phosphate removal.
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Affiliation(s)
- Liping Fang
- Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China
| | - Baile Wu
- Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China
| | - Julie K M Chan
- Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China
| | - Irene M C Lo
- Department of Civil and Environmental Engineering, The Hong Kong University of Science and Technology, Hong Kong, China.
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12
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Li Z, Sun X, Huang L, Liu D, Yu L, Wu H, Wei D. Phosphate adsorption and precipitation on calcite under calco-carbonic equilibrium condition. CHEMOSPHERE 2017; 183:419-428. [PMID: 28558350 DOI: 10.1016/j.chemosphere.2017.05.139] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Revised: 05/14/2017] [Accepted: 05/23/2017] [Indexed: 06/07/2023]
Abstract
Phosphate (PO43-) removal on calcite often entails two processes: adsorption and precipitation. Separating these two processes is of great importance for assessment of PO43- stability after removal. Thus, this study was aimed at finding a critical range of conditions for separating these two processes in calco-carbonic equilibrium, by adjusting PO43- concentration, reaction time and pH. PO43- removal kinetic results showed that: (I) At pH7.7, PO43- removal was mainly by adsorption at initial PO43- concentration ≤2.2 mg L-1 and reaction time ≤24 h, with dominant precipitation occurring at initial PO43- concentration ≥3 mg L-1 after 24 h reaction; (II) At pH8.3, adsorption was the key removal process at initial PO43- concentration ≤7.5 mg L-1 and reaction time ≤24 h, whereas precipitation was observed at initial PO43- concentration of 10 mg L-1 after 24 h reaction, (III) At pH 9.1 and 10.1, PO43- removal mechanism was mainly by adsorption at initial PO43- concentration ≤10 mg L-1 within 24 h reaction. Based on the kinetic results, it is suggested that PO43- precipitation will occur after 24 h reaction when saturation index of amorphous calcium phosphate is between 1.97 and 2.19. Besides, increasing PO43- concentration does not cause a continuous decline of PO43- removal percentage. Moreover, experimental removal data deviated largely from the theoretical adsorption value by CD-MUSIC model. These indicate occurrence of precipitation which is in agreement with the kinetic result. Therefore our study will provide fundamental reference information for better understanding of phosphorous stabilization after removal by calcite.
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Affiliation(s)
- Zhenxuan Li
- Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing University of Information Science and Technology, Nanjing 210044, China; School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China
| | - Xiaowen Sun
- School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China
| | - Lidong Huang
- Jiangsu Provincial Key Laboratory of Agricultural Meteorology, Department of Agricultural Resources and Environment, Nanjing University of Information Science & Technology, Nanjing 210044, China.
| | - Dagang Liu
- Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Nanjing University of Information Science and Technology, Nanjing 210044, China; School of Environmental Science and Engineering, Nanjing University of Information Science & Technology, Nanjing 210044, China
| | - Luji Yu
- College of Water Conservancy and Environmental Engineering, Zhengzhou University, Zhengzhou 450001, China
| | - Hongsheng Wu
- Jiangsu Provincial Key Laboratory of Agricultural Meteorology, Department of Agricultural Resources and Environment, Nanjing University of Information Science & Technology, Nanjing 210044, China
| | - Dongyang Wei
- South China Institute of Environmental Science, MEP, Guangzhou 510655, China
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Lin J, Zhang Z, Zhan Y. Effect of humic acid preloading on phosphate adsorption onto zirconium-modified zeolite. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:12195-12211. [PMID: 28353102 DOI: 10.1007/s11356-017-8873-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2016] [Accepted: 03/20/2017] [Indexed: 06/06/2023]
Abstract
A zirconium-modified zeolite (ZrMZ) was prepared, and then, humic acid (HA) was immobilized on the ZrMZ surface to prepare HA-loaded ZrMZ (HA-ZrMZ). The obtained ZrMZ and HA-ZrMZ were characterized by energy dispersive X-ray spectroscopy, elemental analyzer, N2 adsorption/desorption isotherms, pH at the point of zero charge, and X-ray photoelectron spectroscopy. The adsorption characteristics of phosphate on ZrMZ and HA-ZrMZ were comparatively investigated in batch mode. The adsorption mechanism of phosphate on ZrMZ and HA-ZrMZ was investigated by ionic strength effect and 31P nuclear magnetic resonance. The mechanism for phosphate adsorption onto ZrMZ was the formation of inner-sphere phosphate complexes at the solid/solution interface. The preloading of HA on ZrMZ reduced the phosphate adsorption capacity, and the more the HA loading amount, the lower the phosphate adsorption capacity. However, the preloading of HA on ZrMZ did not change the phosphate adsorption mechanism; i.e., the formation of inner-sphere phosphate surface complexes was still responsible for the adsorption of phosphate on HA-ZrMZ. The decreased phosphate adsorption capacity for ZrMZ after HA coating could be attributed to the fact that the coating of HA on ZrMZ reduced the amount of binding active sites available for phosphate adsorption, changed the adsorbent surface charges, and reduced the specific surface areas and pore volumes of ZrMZ.
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Affiliation(s)
- Jianwei Lin
- College of Marine Science, Shanghai Ocean University, No. 999 Hucheng Huan Road, Shanghai, 201306, China.
| | - Zhe Zhang
- College of Marine Science, Shanghai Ocean University, No. 999 Hucheng Huan Road, Shanghai, 201306, China
| | - Yanhui Zhan
- College of Marine Science, Shanghai Ocean University, No. 999 Hucheng Huan Road, Shanghai, 201306, China
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