International Journal of Environmental Research and Public Health
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2023
·Vol. 20
·期 4
·2793
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IF 4.614
Jie He,Qixuan Song,Jian He
In order to address the growing problem of water pollution caused by the excessive discharge of contaminants and provide a better aquatic ecosystem for the public, increasing attention has been paid to the harmlessness and efficiency of coagulation. In this study, polyaluminum lanthanum silicate (PALS) was synthesized through co-polymerization as a novel coagulant to treat wastewater. FTIR, XRD, and SEM were used to analyze the morphology and structure of the material, which further confirmed that the PALS was successfully synthesized. The results indicated that PALS had a great performance in the treatment of a kaolin–humic acid suspension under the optimal synthesis conditions with Al/Si = 3, La/Si = 0.1, and basicity = 0.7. Compared with conventional coagulants, PALS exhibited a better performance at a low coagulant dose and could achieve a good removal effect for an ultraviolet wavelength less than 254 nm (UV254) (83.87%), residual turbidity (0.49 NTU), and dissolved organic carbon (DOC) (69.57%) at the optimal conditions. Additionally, the PALS showed a better effect on phosphate removal than other coagulants did, where the removal efficiency could reach 99.60%. Charge neutralization and adsorption bridging were the potential wastewater treatment mechanisms employed by the PALS, which showed varied contributions under different pH levels. The results indicated that PALS can be a promising coagulant in water treatment.Keywords:coagulant;water treatment;phosphate adsorption;polymer bridging
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
Materials
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2019
·Vol. 12
·期 20
·3393
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IF 2.972
Jifu Du,Zhen Dong,Zhiyuan Lin,Xin Yang,Long Zhao
A quaternized cotton linter fiber (QCLF) based adsorbent for removal of phosphate was prepared by grafting glycidyl methacrylate onto cotton linter and subsequent ring-opening reaction of epoxy groups and further quaternization. The adsorption behavior of the QCLF for phosphate was evaluated in a batch and column experiment. The batch experiment demonstrated that the adsorption process followed pseudo-second-order kinetics with an R2value of 0.9967, and the Langmuir model with R2value of 0.9952. The theoretical maximum adsorption capacity reached 152.44 mg/g. The experimental data of the fixed-bed column were well fitted with the Thomas and Yoon–Nelson models, and the adsorption capacity of phosphate at 100 mg/L and flow rate 1 mL/min reached 141.58 mg/g. The saturated QCLF could be regenerated by eluting with 1 M HCl.Keywords:radiation grafting;cotton linter;phosphate adsorption;dynamic studies
研究领域:
环境科学
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材料科学
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化学工程
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PubMed
高影响因子
COMPOSITES PART B-ENGINEERING
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2022
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IF 11.322
Xiaohuan Liu,Wenwu Cheng,Yangmi Yu,Shengtao Jiang,Yuzhi Xu,Enmin Zong
A novel adsorbent of ZrO 2 /PEI/Fe 3 O 4 functionalized MWCNTs composite (MWCNTs@Fe 3 O 4 @PEI-Zr) possessing a high affinity to phosphate and easily separated from aqueous solution was proposed in this work. The ZrO 2 and PEI modified on the surface act as active sites for the removal of phosphate, while the Fe 3 O 4 allows for the easy separation by applying an external magnetic field . Compared to traditional separation like centrifugation, magnetic separation markedly reduces energy consumption and provides more possibilities for application. The composite exhibits a relatively high surface area of 162.9 m 2 g -1 with a larger number of mesopores. As-prepared MWCNTs@Fe 3 O 4 @PEI-Zr is found to have a relatively high phosphate adsorption capacity of 21.14 mg P g −1 and it can be recovered rapidly from water under an external magnetic field . Moreover, MWCNTs@Fe 3 O 4 @PEI-Zr exhibits an outstanding anti-interference capability in terms of the coexisting ion and ionic strength of solutions. Importantly, the dissolution of Zr and Fe are negligible (less than 0.015 mg L −1 ) over a wide pH range of 4.04–9.98, indicating that the MWCNTs@Fe 3 O 4 @PEI-Zr is a structurally stable hybrid composite particle with strong interaction. Furthermore, it shows a good reusability and 86.2% removal efficiency of phosphate remains after three consecutive cycles. Both the ligand exchange and the electrostatic attraction are mainly responsible for phosphate removal by MWCNTs@Fe 3 O 4 @PEI-Zr. This work demonstrated that the highly efficient, easy separable, high stability and reusability MWCNTs@Fe 3 O 4 @PEI-Zr composite has the potential for phosphate removal.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2019
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IF 5.107
Jiaqian Zhu,Jiaying Li,Yuying Li,Jia Guo,Xiang Yu,Liang Peng,Boping Han,Yi Zhu,Yuanming Zhang
Bismuth oxyiodide (BiOI) with 3D microspheres structure was prepared and used for adsorption of phosphate and photodegradation of dyes in phosphate-dye binary system for the first time. BiOI exhibited excellent adsorption capacity of phosphate up to 55.80 mg P/L and outstanding photocatalytic activities for all the cationic dyes in phosphate-cationic dye binary system. RhB was 100% photodegraded within 50 min, and the photodegradation rates of MB and FB reached 92% and 95% within 100 min, respectively. But in phosphate-anionic/neutral dye binary system, BiOI displayed only good adsorption performance of phosphate but showed no photodegradation performance for anionic or neutral dyes. The mechanism was proposed as that PO 4 3− adsorbed on the surface of BiOI, which changed from being neutral into being negatively charged, and then the cationic dyes were absorbed due to electrostatic attraction for photodegradation. The photodegradation was confirmed that the photogenerated electrons from the conduction band (CB) of BiOI which could reduce O 2 to ·O 2 − and associate with h + oxidized the cationic dyes. This work established a new approach of photodegrading organic dyes and adsorbing phosphate in waterbodies, and provided a new insight into wastewater treatment with two or more pollutants.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
CHEMOSPHERE
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2024
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IF 8.1
Xiaochang Lin,Bo Sun,Pengsen Wang,Min Zhao,Dejia Liu,Qiyu Zhang,Baile Wu,Dezhao Liu
A magnetic Fe n UiO-66 adsorbent was created to achieve high phosphate adsorption capacity. The incorporation of Fe 3 O 4 facilitated the precipitation and growth of UiO-66 during crystallization, resulting in a shift towards a multilayer heterogeneous distribution of adsorption sites. The increased Fe 3 O 4 content notably enhanced the magnetic properties of Fe n UiO-66, while negligibly affecting its adsorption performance. The Fe 1.5 UiO-66 demonstrated exceptional phosphate adsorption capacity (136.54 mg/g), outstanding selectivity, and sustained reusability, with an 80% removal efficiency after nine cycles of treating actual water. The mechanism of phosphate adsorption by Fe n UiO-66 involved electrostatic attraction, ligand exchange, and linker exchange. Notably, while linker exchange significantly contributed to high adsorption capacity, it resulted in irreversible damage to the Fe n UiO-66 crystal. These unequivocal findings will serve as a solid foundation for further research and underline the critical role of linkers in the process of phosphate adsorption.
研究领域:
环境科学
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材料科学
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PubMed
高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2020
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IF 9.038
Sujie Shan,Wei Wang,Dongmei Liu,Zhiwei Zhao,Wenxin Shi,Fuyi Cui
Owing to the twin problems of eutrophication and global phosphorus (P) scarcity, the removal and recovery of phosphate from water and wastewater have received increasing attention. Herein, magnetically recyclable La 2 O 2 CO 3 /γ-Fe 2 O 3 adsorbents were rationally designed by derivation from La/Fe binary metal organic framework (MOF) precursors via calcination treatment. Based upon preliminary screening of as-prepared La 2 O 2 CO 3 /γ-Fe 2 O 3 nanocomposites with different La-to-Fe molar ratios in terms of phosphate sorption capacity and magnetic property as well as La content, La 2 O 2 CO 3 /γ-Fe 2 O 3 nanocomposite with a La-to-Fe molar ratio of 2:1 was selected for further characterization and adsorption performance evaluation. Batch adsorption experiments showed that La 2 O 2 CO 3 /γ-Fe 2 O 3 (2:1) adsorbent exhibited a remarkable phosphate sorption capacity of 134.82 mg P/g, a fast sorption kinetic, strong selectivity for phosphate in the presence of co-existing anions, and a wide applicable pH range of 3−9. Furthermore, La 2 O 2 CO 3 /γ-Fe 2 O 3 (2:1) sorbent displayed an excellent sorption performance for low-concentration wastewater, a low dosage of 0.1 g/L was sufficiently enough for reducing P-concentration from 0.5 mg P/L to below 10 μg P/L within 20 min. In a real sewage of 2.68 mg P/L, 0.2 g/L of sorbent could reduce the concentration of phosphate to <0.01 mg P/L within 50 min. Moreover, over 83.1 % of original sorption capacity could be retained after 5 consecutive regeneration cycles, showing great regenerative performance of the adsorbent. These development is expected to be meaningful for practical water purification.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
Journal of Environmental Chemical Engineering
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2020
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IF 4.3
Yi Cheng,Jilin Zhang
Excessive phosphate in wastewater can cause eutrophication of water body, which will worsen the ecological environment and threaten human health and biological life safety. Adsorption of phosphate is the most effective way to remove phosphate, and efficient adsorbent is the key. Amorphous La(OH) 3 has been deemed as a potential phosphate adsorbent on account of high adsorption capacity and environmentally friendly property. However, it also shows some disadvantages such as easy agglomeration, poor water dispersion. In this study, UiO-66-NH 2 was used as carrier to load amorphous lanthanum hydroxide as an adsorbent for phosphate removal. The adsorbent (UiO-66-NH 2 @La(OH) 3 , ULCs) has good water dispersibility and it is easy to be separated and recovered. At the same time, the maximum phosphate adsorption capacity can reach 140.7 mg P/g. The adsorption process accords with pseudo second order kinetic model and Freundlich isotherm model. The thermodynamic results showed that the adsorption process was spontaneous and endothermic. In addition, in the presence of coexisting anions (such as Cl − , SO 4 2− , NO 3 − ), it also exhibited high selectivity and phosphate removal efficiency. Meanwhile, the adsorption capacity keeps at a high level in the range of pH 3–11. By the merit of above-mentioned properties, the prepared material is expected to be an ideal candidate for phosphate removal from contaminated water.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
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2025
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IF 7.8
Sujie Shan,Xingning Huang,Zhenyu Yang,Jie Ji,Zhihao Chen,Chongming Wang,Xinpeng Xu,Xi Li,Yao Xu,Songqi Liu,Boling Li,Dapeng Li
Scavenging low-concentration phosphate in secondary effluents to ultra-low levels (e.g., <0.05 mg-P/L) is crucial for mitigating severe eutrophication issues. While adsorption shows promise for phosphate removal and recovery, challenges such as limited sorption capacity and selectivity for low-level phosphate persist, increasing operational costs. Herein, lanthanum (La)-incorporated MgFe-layered double hydroxide/biochar (La-MgFe-LDH/BC) composites were synthesized using a simple coprecipitation method for the effective sequestration and recovery of low-level phosphate. The incorporation of La promoted the formation of amorphous LDH species with markedly reduced particle sizes, enhanced porosity, and increased carbonate groups. Consequently, La-MgFe-LDH/BC exhibited an exceptional sorption capacity of 62.51 mg-P/g, rapid sorption kinetics of <60 minutes, and a broad applicable pH range (3-11), with strong anti-interference capabilities against concomitant anions and humic acids. La-MgFe-LDH/BC effectively scavenged phosphate from real secondary effluents and raw sewage, achieving extreme-low phosphate levels below 0.01 mg-P/L, making it highly applicable for effluent polishing. Furthermore, it showed excellent reusability and phosphate recovery potential with over 90% desorption efficiency, with ligand exchange mechanisms being primary pathways for phosphate capture. These findings highlight La-MgFe-LDH/BC as a promising candidate for low-level phosphate removal and advance the application of LDH-based composites.
研究领域:
环境科学
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材料科学
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DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2019
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IF 5.589
Hui Qiu,Wenxiang Ni,Haihan Zhang,Kai Chen,Jiacheng Yu
Chemical modification of agricultural waste biomass has proved to be an economy and effective approach to capture phosphate ions, except for that under acidic conditions and highly competitive ion systems. According to this, a new nanocomposite (HFO@St+) was fabricated by incorporating nano-sized hydrous Fe(III) oxides (HFO) within aminated wheat straw in order to overcome the bottleneck. The optimal pH of phosphate uptake by HFO@St+ was greatly broadened and observed over a wide pH range between 2.0 and 7.0. The binary exchange reaction indicated that phosphate was strongly and preferably adsorbed by HFO@St+ with the separation factor K of phosphate over nitrate increasing from 0.23–1 or 0.20–0.26 to 2.5–38 or 2.5–15 for near neutral or acidic pHs, respectively. The sorption selectivity for HFO@St+ followed the order of phosphate > nitrate > chloride under experimental conditions. The presence of inorganic and organic ligands (SO 4 and HA) showed no significant effect on phosphate adsorption. XPS and FT-IR analyses were performed to explore the underlying mechanism of adsorption. The exhausted material could be regenerated with NaOH-NaCl solution for at least ten cycles, indicating that HFO@St+ can be used as a sustainable biomass product with excellent adsorption affinity for phosphate removal .
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
Materials
·
2023
·Vol. 16
·期 4
·1435
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IF 3.4
Rui Liu,Shouguang Yao,Yan Shen,Yu Tian,Qiqi Zhang
In this study, N-doped layered porous carbon prepared by the high-temperature solid-state method is used as electrode material. Nano calcium carbonate (CaCO3) (40 nm diameter) is used as the hard template, sucrose (C12H22O11) as the carbon source, and melamine (C3H6N6) as the nitrogen source. The materials prepared at 850 °C, 750 °C, and 650 °C are compared with YP-50F commercial super-activated carbon from Japan Kuraray Company. The electrode material at 850 °C pyrolysis temperature has a higher specific surface area and more pores suitable for ion adsorption. Due to these advantages, the salt adsorption capacity (SAC) of the N-doped layered porous carbon at 850 °C reached 12.56 mg/g at 1.2 V applied DC voltage, 500 mg/L initial solution concentration, and 15 mL/min inlet solution flow rate, which is better than the commercial super activated carbon as a comparison. In addition, it will be demonstrated that the N-doped layered porous carbon at 850 °C has a high salt adsorption capacity CDI performance than YP-50F by studying parameters with different applied voltages and flow rates as well as solution concentrations.Keywords:capacitive deionization;N-doped layered porous carbon;salt adsorption capacity
研究领域:
材料科学
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环境工程
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DOI
PubMed
高影响因子
Polymers
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2023
·Vol. 15
·期 1
·248
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IF 5
Yao Lu,Xuna Jin,Xiang Li,Minpeng Liu,Baolei Liu,Xiaodan Zeng,Jie Chen,Zhigang Liu,Shihua Yu,Yucheng Xu
Superparamagnetic Fe3O4particles have been synthesized by solvothermal method, and a layer of dense silica sol polymer is coated on the surface prepared by sol-gel technique; then La(OH)3covered the surface of silica sol polymer in an irregular shape by controlled in situ growth technology. These magnetic materials are characterized by TEM, FT-IR, XRD, SEM, EDS and VSM; the results show that La(OH)3nanoparticles have successfully modified on Fe3O4surface. The prepared Fe3O4@La(OH)3inorganic polymer has been used as adsorbent to remove phosphate efficiently. The effects of solution pH, adsorbent dosage and co-existing ions on phosphate removal are investigated. Moreover, the adsorption kinetic equation and isothermal model are used to describe the adsorption performance of Fe3O4@La(OH)3. It was observed that Fe3O4@La(OH)3exhibits a fast equilibrium time of 20 min, high phosphate removal rate (>95.7%), high sorption capacity of 63.72 mgP/g, excellent selectivity for phosphate in the presence of competing ions, under the conditions of phosphate concentration 30 mgP/L, pH = 7, adsorbent dose 0.6 g/L and room temperature. The phosphate adsorption process by Fe3O4@La(OH)3is best described by the pseudo-second-order equation and Langmuir isotherm model. Furthermore, the real samples and reusability experiment indicate that Fe3O4@La(OH)3could be regenerated after desorption, and 92.78% phosphate removing remained after five cycles. Therefore, La(OH)3nanoparticles deposited on the surface of monodisperse Fe3O4microspheres have been synthesized for the first time by a controlled in-situ growth method. Experiments have proved that Fe3O4@La(OH)3particles with fast separability, large adsorption capacity and easy reusability can be used as a promising material in the treatment of phosphate wastewater or organic pollutants containing phosphoric acid functional group.Keywords:superparamagnetic;Fe3O4@La(OH)3inorganic polymer;phosphate adsorption
研究领域:
材料科学
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环境科学
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PubMed
高影响因子
CELLULOSE
·
2022
·Vol. 29
·期 16
·8749-8768
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IF 6.123
Zhang Zhiyong,Liu Tang,Wu Deyi
The removal and recovery of phosphate from water using adsorption technology require that the adsorbent material is easily separable from treated water. Continuous efforts are still awaited to develop additional efficient phosphate adsorbents that are economical to fabricate. In this study, hydrous zirconia-impregnated chitosan beads (HZCB) containing different Zr/chitosan ratios were synthesized using a facile scheme. We found that HZCB with a Zr/amine molar ratio of ~ 1 (HZCB-1) possessed excellent stability and phosphate removal performance. This optimized material was characterized with XRD, SEM, FTIR, XPS, specific surface area and point of zero charge measurements. The maximum adsorption capacity was 42.02 mg/g (at pH ~ 6.7). The adsorption kinetics were best described by a pseudosecond-order model, and the rate constant of HZCB-1 was much lower than that of its powder but was similar to the commercial bead product Ferrolox. The removal of phosphate depended substantially upon pH and was enhanced by lowering the pH. Good selectivity of HZCB-1 for phosphate was observed, although the coexistence of sulfate produced a significant negative effect. Direct coordination of phosphate to Zr atoms by replacing hydroxyls was the dominant adsorption mechanism (~ 85%), while chitosan also contributed to phosphate removal (~ 15%). Adsorbed phosphate was successfully eluted by an NaOH solution, and the material obtained after desorption and regeneration was able to be repeatedly used. The results of column studies indicated that this material could be implemented in long-term application.
研究领域:
环境科学
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材料科学
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高影响因子
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