WATER RESEARCH
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2025
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IF 12.4
Ziyi Zhao,Yanan Mi,Shili Wang,Xuedong Du,Qingrui Zhang
We firstly present a novel strategy for enhancing fluoride removal from contaminated water using defect-engineered UiO-66 (Zr-MOFs), emphasizing the crucial role of pKa in modulator selection. By utilizing modulators with varying pKa values-specifically benzimidazole (BI), benzoic acid (BA), and acetic acid (AA)-we synthesized defect-rich Act-UiO-66-M(X). The higher pKa of BI facilitated greater defect formation, resulting in significantly improved adsorption capacity and faster diffusion rates. Act-UiO-66-BI(8), modulated with BI, showed a higher intensity peak at g = 2.003 in ESR analysis, indicating more oxygen vacancies. Its fluoride adsorption capacity reached 93.59 mg F/g, nearly six times higher than commercial ZrO 2 , with rapid kinetics—evidenced by a kinetic rate constant (k int ) of 2.64 mg/g·min 0.5 and equilibrium achieved within 10 minutes. The kinetic performance was enhanced by 270% compared to raw Act-UiO-66. Furthermore, Act-UiO-66-BI(8) demonstrated high selectivity and stability in high-salinity environments, with a K d coefficient consistently exceeding 17,900 mL/g. The study highlights that selecting modulators based on pKa enhances defect formation, improving active site exposure and pore diffusion, as confirmed by DFT calculations and XPS analysis. The ability of Act-UiO-66-BI(8) to treat up to 1160 kg of wastewater per kg of adsorbent highlights its potential for large-scale water purification, showcasing a promising approach for developing high-performance MOF materials.
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
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
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IF 8.6
Hao Zhang,Jingyi Liang,Zhikang Li,Feng Xiao,Yanhui Wu,Chaojie Zhang
The treatment of fluorine-containing wastewater has very important significance for environmental protection. Forward osmosis (FO), using osmotic pressure gradient as driving force, can remove ion from aqueous solutions effectively. The key to improve the separation efficiency of FO is to prepare the membrane of excellent performance. In this work, chitosan (CS)/tannic acid (TA) interlayer was constructed by the strategy of polyphenol/polyamine liquid phase co-deposition, then three-layer FO membranes with more uniform surface and higher hydrophilicity were obtained by interfacial polymerization on the interlayer. And the effects of co-deposition time and mass ratio of CS/TA on the performance of FO treating simulated fluorine-containing wastewater were also investigated. Experimental results showed that the optimal co-deposition time was 60 min and the mass ratio of CS/TA was 0.5. The water flux of the TFC-CS/TA 0.5 – 60 membrane (TFC means thin film composite, 0.5 is the mass ratio of CS/TA, 60 means the co-deposition time is 60 min) reached 22.3 LMH and the fluorine rejection was 99.93%, when it was applied to treat model waste water containing fluoride of 300 mg/L. In FO test on fluorine-containing wastewater from a semiconductor factory, compared with commercial Aquaporin Inside TM FO membrane, the water flux of TFC-CS/TA 0.5 – 60 membrane was 49.3% higher than that of the commercial membrane. This study provides a new idea for the preparation of high-efficiency FO membranes and has a good prospect for the treatment of industrial fluorine-containing wastewater.
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
RSC Advances
·
2025
·Vol. 15
·期 1
·48-57
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IF 4.6
Boxuan Li,Shaoxin Wen,Jiacheng Li,Dedong He,Yongming Luo,Xiangqian Zheng,Dingkai Chen
Polysilicate-ferric-calcium-lanthanum (PSFCL) was synthesized through a co-polymerization method in order to treat the yellow phosphorus wastewater. Its morphology, composition and functional group were analyzed by X-ray Diffraction (XRD), Fourier Transform-Infrared Spectroscopy (FTIR), Scanning Electron Microscopic (SEM) and X-ray Photoelectron Spectroscopy (XPS), respectively. The optimization of the flocculant was also investigated, including La/Si molar ratio, pH, agitation time, dosage and sedimentation time. Results showed that PSFCL has reached an excellent removal efficiency of 95% and 97% towards phosphorus and fluoride, respectively. It could be inferred that charge neutralization, bridging effect and ligand exchange were the main coagulation mechanisms. As a whole, after the introduction of lanthanum, PSFCL was found to be a promising flocculant in yellow phosphorus wastewater treatment owing to its high removal efficiency and simple synthesis route.
研究领域:
环境科学
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化学工程
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DOI
PubMed
高影响因子
Polymers
·
2025
·Vol. 17
·期 6
·826
·
IF 4.9
Jiahao Wang,Huali Zhang,Nenghao Wang,Han Mo,Zhen Yang,Yangyang Dong,Qingwei Liu,Xiao Huang,Baoyi Han
The sustainable management of industrial byproducts represents a critical challenge for the aluminum industry. This study developed a cost-effective adsorbent (SA@RM) derived from sodium alginate and red mud for fluoride removal, addressing both solid waste utilization and water purification needs. Systematic adsorption experiments revealed optimal performance under conditions of 15 g/L dosage and pH 5, achieving adsorption equilibrium within 40 min for initial fluoride concentrations of 11.7 mg/L. Notably, the adsorbent demonstrated exceptional cyclic stability, maintaining 54.8% adsorption capacity through three regeneration cycles. The adsorption process followed the Langmuir isotherm model (R2= 0.994) and pseudo-second-order kinetics (R2= 0.975), indicating monolayer chemisorption as the dominant mechanism. Advanced characterization techniques (SEM-EDS, FT-IR, XPS) elucidated three main mechanisms: fluoride complexation with aluminum oxides, ligand exchange with surface hydroxyl groups, and ion exchange with chloride species. This material achieves 92% fluoride removal while valorizing industrial waste, reducing adsorbent production costs by 60–70% compared to conventional materials. The detailed mechanism analysis provides fundamental insights for designing waste-derived adsorbents, offering a practical solution for sustainable industrial development and water treatment applications.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA
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2021
·
IF 2.917
Lei HUANG,Zhi-hui YANG,LÜ-ji YAN,Sikpaam Issaka ALHASSAN,Hai-yin GANG,Ting WANG,Hai-ying WANG
2D carbon ribbon/Al 2 O 3 was synthesized with two-dimensional metal organic frameworks 2D-MOFs as precursors using the solvothermal and calcination methods. Batch experiments of adsorption parameters such as pH, liquid/solid ratio, adsorption kinetics, adsorption thermodynamics, and anions competitions were investigated to understand the adsorptive behavior of fluoride on carbon ribbon/Al 2 O 3 and nitrogen-doped carbon ribbon/Al 2 O 3 . The adsorption of fluoride on carbon ribbon/Al 2 O 3 could be described as the chemical and multilayer adsorption, while the adsorption of fluoride on nitrogen-doped carbon ribbon/Al 2 O 3 followed the chemical and monolayer adsorption phenomenon. The fluoride on nitrogen-doped carbon ribbon/Al 2 O 3 had a much faster adsorption rate of 3.1×10 −7 m/s than carbon ribbon/Al 2 O 3 , which was 1.2×10 −7 m/s. The nitrogen-doping on carbon ribbon enhances structural defects and improves the adsorption performance of fluoride. Also, the diacetylene linkages (—C≡C—) and pyridinic-N were studied to understand their influences on removing fluoride. The result indicates that carbon ribbon and nitrogen-doped ribbon could serve as good adsorbents for removing fluoride.
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
Materials
·
2025
·Vol. 18
·期 7
·1421
·
IF 3.2
Wei Li,Yi Wu,Ruiqing Huang,Chen Yang,Mei Zhang,Pengchen Xie,Jian Xiong,Xuebin Lu
Municipal sludge was pyrolyzed to produce sludge-derived biochar (SBC), which was subsequently modified with lanthanum nitrate. Through orthogonal experiments, the optimal preparation conditions for La-SBC-700 were determined. The morphological and textural properties of the biochar material, such as specific surface area, were characterized and batch adsorption experiments simulating fluoride-containing wastewater were conducted to investigate the effects of pH, fluoride concentration, biochar dosage, and coexisting ions on the fluoride removal performance of La-SBC-700. The application potential of the biochar material in real geothermal water was also assessed. The results indicated that La-SBC-700 prepared under optimal conditions exhibited an adsorption capacity approximately 10 times higher than that of the pristine biochar (SBC). The adsorption process was stable within the pH range of 5.0 to 8.0 and conformed to the Quasi-secondary-order kinetic and Langmuir isotherm models, with a maximum theoretical adsorption capacity of 40.338 mg/g. The adsorption process was spontaneous and endothermic.NO3−and Cl−had negligible effects on fluoride removal, whereasCO32−,SO42−, andHCO3−exerted varying degrees of influence on the adsorption process. La-SBC-700 demonstrated excellent performance in removing fluoride from geothermal water, providing a reference method for the resourceful utilization of sludge and the removal of fluoride from geothermal water.
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
Applied Sciences-Basel
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2025
·Vol. 15
·期 14
·7829
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IF 2.5
Mengfei Ma,Yingpeng Gu,Ruijie Wang,Yue Sun
The deep defluorination of water remains a significant environmental challenge. In this work, aluminum was loaded onto the bifunctional resin S957 containing a phosphoric-sulfonic acid difunctional group for efficient fluoride removal. Al-S957 demonstrated excellent fluoride removal performance across a broad pH range. When anions and organics coexisted, Al-S957 exhibited significantly better fluoride adsorption performance compared to aluminum-loaded monofunctional resins. The adsorption followed an endothermic chemisorption process on a monolayer surface. FTIR and XPS analyses further revealed that fluoride removal relied on a ligand exchange mechanism. Column adsorption conducted over five cycles highlighted the strong practical potential of Al-S957. The results suggested that Al-S957 exhibits significant potential for practical applications.
研究领域:
环境科学
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水处理技术
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吸附材料
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环境功能材料
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
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IF 13.3
Liwei Yang,Xinyuan Tian,Zhuoyue Liu,Hui Yu,Zixin Peng,Chao Hai,Xing Xu,Chuanliang Zhao
MnO 2 has a large potential for defluoridation, however, the influences of its crystal forms on the performance and mechanism of defluoridation are unknown. The research systematically investigated the defluoridation performance and mechanism of a total of eight materials with different crystal forms of MnO 2 (α, β, γ, δ) before and after lanthanum modification, separately. It was indicated that the largest Langmuir adsorption of α-MnO 2 and La-γ-MnO 2 for fluoride achieved 5.04 mg/g and 42.39 mg/g, correspondingly. The surface hydroxyl group and lanthanum loading of the material proved to be the major contributors to defluoridation. For the adsorption performance of eight materials on fluoride, pH was a significant influencing factor, with the highest adsorption performance at pH 5 ∼ 6. The eight materials showed consistent selectivity for fluoride adsorption in the existence of different anions, with the order of influence on the removal efficiency: CO 3 2– > NO 3 – > SO 4 2 – > Cl – . The studies of FTIR, XPS, and variation of solution pH further illustrated that the adsorption mechanism of the eight materials on fluoride was the ion-exchange interaction and the complexation reaction. In addition, the effect of crystal forms on the adsorption of fluoride ions was further elaborated by DFT analysis. Finally, this study provided an in-depth discussion of the parameters of the dynamic process as well as the nature of the penetration curves by applying the Thomas, Clark, and BDST models.
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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2016
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IF 3.698
Chunlu Li,Nan Chen,Yanan Zhao,Rui Li,Chuanping Feng
In this study, an effective defluoridation adsorbent was developed by depositing polypyrrole (PPy) on granular peanut shell biological carbon (BC) via in situ chemical oxidative polymerization. The variables of defluoridation process (i.e., adsorbent dosage, fluoride solution pH, and anionic interference) were tested. The mechanism was determined by isotherm and kinetic studies, Brunauer-Emmett-Teller (BET) method, scanning electronic microscopy (SEM), X-ray photoelectron spectroscopy (XPS), Fourier transform infrared (FTIR) spectroscopy and automatic titration. The PPy-grafted BC (PPy/BC) composite performed commendably from pH 2.0 to 10.0, and exhibited high selectivity for fluoride in the presence of several co-existing anions. The experimental data were described well by a Langmuir isotherm curve, and the maximum adsorption capacity was 17.15 mg g −1 . Kinetic studies illustrated the adsorption process was accomplished via surface adsorption as well as by intraparticle diffusion. In addition, mesoporous diffusion was the rate-controlling step in intraparticle diffusion process. BET and SEM analysis revealed the sponge-like polymer adhered to the BC and plugged the pores. XPS, FTIR, and SEM confirmed that fluoride removal was accomplished via the replacement of doped ionizable chloride ions (Cl − ) coupled with positively charged nitrogen (N + ), computation of XPS data enabled the formulation of a three-layer-deep hypothesis for PPy.
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
CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Naicai Xu,Zhong Liu,Yaping Dong,Tianzeng Hong,Li Dang,Wu Li
Gamma phase of mesoporous alumina (MA) with large surface area was successfully synthesized by a facile hydrothermal method followed by thermal treatment for fluoride removal. The as-synthesized MA nanoparticles with average size of 20 nm–150 nm have ordered wormhole-like mesoporous structure. The pore size is 5 nm with a narrow distribution, and the specific surface area reaches 357 m 2 g −1 while the bulk density is 0.45 cm 3 g −1 . Glucose as a small-molecule template plays an important role on the morphology, surface area and pore diameter of the MA. As an ionic adsorbent for fluoride removal, the maximum adsorption capacity of MA is 8.25 mg g −1 , and the remove efficiency reaches 90% in several minutes at pH of 3. The Langmuir equilibrium model is found to be suitable for describing the fluoride sorption on MA and the adsorption behavior follows the pseudo-second-order equation well with a correlation coefficient larger than 0.99. The larger surface area and relatively narrow pore size of MA are believed to be responsible for improving the adsorption efficiency for fluoride in aqueous solution.
研究领域:
材料科学
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环境科学
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产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2025
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IF 5.4
Yue Xu,Zhao Wang,Zizhen Wu,Xuan Li,Xu Bi,Guangying Feng,Ningyi Li
Coal gangue (CG) was encapsulated into lanthanum alginate and calcium alginate to synthesize bimetallic modified coal gangue-alginate composite hydrogel beads (La-Ca/CG-SA), and their adsorption potential towards fluoride (F − ) from groundwater was investigated. Under optimal conditions (preparation parameters: CG dosage 6 %, La/Ca ratio 1:2, and crosslinking time 24 h; operational parameters: adsorbent dosage 0.3 g L −1 , pH 6.0, and F − concentration 3 mg L −1 ), the maximum adsorption capacity of F − was achieved (15.7 mg g −1 and 87.8 %). Kinetic results indicated that the adsorption process of F − by La-Ca/CG-SA followed the pseudo-second-order model (R 2 > 0.95). Coexisting ion experiments suggested that La-Ca/CG-SA exhibited high selectivity for F − . Additionally, La-Ca/CG-SA maintained superior F − removal performance (81.5 %) after five cycles. Electrostatic interaction, inner-sphere complexation, chemical precipitation, and ion exchange were demonstrated to drive the F − immobilization. This study provides novel insights into the resource utilization of CG and the development of high-performance hydrogel adsorbents, offering potential application value in treating fluoride-contaminated groundwater.
研究领域:
环境科学
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水处理技术
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材料化学
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污染控制工程
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资源化利用
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Danqing Shen,Qian Du,Pan Wang,Yongquan Zhou,Jianming Pan
The continuous phase films in high internal phase emulsions (HIPEs), which seems to be a microchannel-like space, are benefit for confined synthesis of ultrafine adsorbent. Herein, switchable and microchannel-like space in the continuous phase of oil-in-water HIPEs is developed for fabricating ultrafine ZrO 2 anchoring cross-linked enzyme aggregates (CLEAs-ZrO 2 ), and then as-prepared composites were applied as defluoridation adsorbent. Bis(3-aminopropyl)tetramethyldisiloxane oleic acid surfactant (BTOA) can realize reversible emulsification and demulsification in response to CO 2 /N 2 switch, endowing with simple collection of products and continuous preparation. This confinement effect is expected of resulting in a 28 % increase in adsorption capacity and 33 % reduction in synthesis time. In addition, the adsorption capacity of CLEAs-ZrO 2 is nearly 4.2 times higher than that of commercially available defluoridants. In fluorine-containing industrial wastewater, the removal efficiency of fluoride ion (F - ) reaches 93 %, and the corresponding partition coefficients ( K d ) achieves the value of 31.1 L g −1 . By analyzing with XPS spectra and in-situ FT-IR spectroscopy, a strong Zr-F bonding interaction between CLEAs-ZrO 2 and F - in the solution boosts this specific adsorption. This work presents a novel method for constructing switchable confinement system, but also offers a promising defluoridation adsorbent for industrial effluents.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）