PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
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2025
·Vol. 122
·期 12
·e2501354122
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IF 9.1
Leiming Lin,Zheng Li,Jun Ren,Ying Meng,Fubo Luan
The co-occurrence of arsenic and uranium in groundwater has been found in many countries, posing a significant challenge to human health. Here, we have demonstrated the efficient simultaneous removal of arsenic and uranyl-carbonate complexes from groundwater using {001}-TiO2. Surprisingly, the presence of U(VI) greatly enhanced the adsorption of As(V) on {001}-TiO2, while As(V) had a negligible impact on U(VI) adsorption. Through in situ ATR-FTIR spectroscopy, we uncovered a mechanism involving the formation of a ternary surface complex [Ti–U(VI)–As(V)] on the surface of {001}-TiO2. This ternary surface complex formed through the substitution of CO32- from uranyl coordination sites. Furthermore, the adsorbed As(V) and U(VI) can be easily recovered using a sodium hydroxide solution, and {001}-TiO2 can be used repeatedly. Our findings offer a promising solution for the simultaneous removal of As(V) and U(VI) from groundwater and provide valuable insights into the mechanisms involved in their removal.
研究领域:
环境科学
·
化学
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DOI
PubMed
高影响因子
CLAYS AND CLAY MINERALS
·
2021
·Vol. 69
·期 6
·759-771
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IF 1.609
Yu Wei Hua,Liu Jia Hui,Wang Min,Li Na,Zhang Jun Rui,Huang Tian Hao,Zhou Chun Hui
Organo-montmorillonite (OMnt) has wide applications in paints, clay-polymer nanocomposites, biomaterials, etc. In most cases, the dispersibility and swellability of OMnt dictate the performance of OMnt in the target products. Previous studies have revealed that the properties can be improved when multiple organic species are co-introduced into the interlayer space of montmorillonite (Mnt). In the present study, single surfactant erucylamide (EA), dual-surfactants cetyltrimethyl ammonium bromide (CTAB) and octadecyltrimethyl ammonium chloride (OTAC), and ternary-surfactants EA, CTAB, and OTAC were co-introduced into Mnt by solution intercalation. The resulting OMnts were characterized by powder X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectroscopy, thermogravimetry-differential thermogravimetry (TG-DTG), water contact-angle tests, scanning electronic microscopy (SEM), laser particle-size analysis, and swelling indices. Mnt co-modified by ternary CTAB, OTAC, and EA led to a large d 001 value (4.20 nm), surface hydrophobicity with a contact angle of 95.6°, swellability (50 mL/g) with small average particle sizes (2.1−2.8 μm) in xylene, and >99% of the OMnt particles were kept as <5 μm in deionized water. The formation of EA-modified-Mnt was proposed according to hydrophobic affinity, hydrogen bonding, and van der Waals forces. The nanoplatelets of the CTA + , OTA + , and EA co-modified OMnts in xylene were assembled into a house-of-cards structure by face-to-edge and edge-to-edge associations. The electrostatic attractions, electrostatic and steric repulsions, and hydrophobic interactions were responsible for the good dispersibility of OMnt in xylene. The ternary surfactant co-modified OMnt with high dispersion and swellability will make OMnt better suited for real-world applications.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
Small
·
2025
·
IF 12.1
Wenqing Hai,Siyi Bi,Lili Yang,Jiatong Wu,Wenlong Huang,Mengting Cui,Xin Zhang,Jing Meng,Chunhui Chen,Huiqi Shao,Guangwei Shao,Jinhua Jiang,Nanliang Chen
The irreconcilable camouflage mechanisms of radar and infrared spectroscopy present substantial challenges to integrating multi-physics field cloaking technology. Although aerogels possess both microwave dissipation and thermal insulation, higher infrared emissivity restrict further amelioration in compatible stealth field. Herein, we propose a bilayer configuration comprised of aramid nanofiber (ANF) aerogel and infrared shielding meta-surface (ISM). The top ISM with low-pass filtering capabilities is engineered to regulate emissivity while remaining transparent to microwaves. While the bottom quaternary ANF aerogels with radar dissipation and thermal insulation are synthesized by multi-scale design strategy and heterogeneous surface engineering. Through theoretical and experimental optimization, the assembled compatible stealth composite achieves a near-perfect absorption in X-band, while the synergy of low emissivity and thermal insulation facilitates concealment in infrared windows. Specifically, the minimum reflection loss (RL) reaches −32.44 dB, effective absorption bandwidth (EAB) expands to 3.69 GHz (8.71–12.40 GHz), and the integration of effective reflection loss value ( ΔH ) increases to 9.92 dB GHz mm −1 . Additionally, low thermal conductivity (0.0288 W (m K) −1 ) and average infrared emissivity (0.23 in 3–5 µm and 0.25 in 8–14 µm) can reduce infrared radiation energy by 68.1%. This research provides a new thought for the design of multispectral camouflage and demonstrates enormous potential in stealth technologies.
研究领域:
材料科学
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电磁学
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热学
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DOI
PubMed
高影响因子
CONSTRUCTION AND BUILDING MATERIALS
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2024
·
IF 7.4
Zhi Li,Shengjie Yao,Guichao Wang,Qiong Liu,Zhenkui Chen,Xiaoxu Wu,Yan Luo
Developing silica aerogel slurries is a strategic approach for incorporating silica aerogels into matrix materials to enhance the efficiency of aerogel composites. This study introduces a novel binary surfactant mixture, using a 1:4 ratio of polyether L62 and CTAC, optimized for the performance of aerogel slurries. Our extensive testing reveals that this formulation significantly reduces the surface tension to 24.25 mN/m and achieves a remarkable thermal conductivity of 26.7 mW/m/K, while maintaining high hydrophobicity with a contact angle exceeding 125°. The slurries exhibit a wet density of 0.48 g/cm³ and a dry density of 0.098 g/cm³, emphasizing the lightweight nature of the aerogel composites. Additionally, the study illustrates that while increasing the surfactant concentration optimally raises the aerogel content, excess surfactant adversely affects the thermal insulation properties. Microstructural analysis confirms that the binary surfactant mixture effectively modifies the aerogel surface, overcoming the dispersal limitations associated with aerogel's hydrophobic groups. This breakthrough in slurry formulation greatly enhances both the insulating and water-repellent capabilities of silica aerogels, offering a viable engineering solution for developing high-performance aerogel composites for thermal insulation applications.
研究领域:
材料科学
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建筑工程
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DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
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2025
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IF 11.3
Nuanqin Zhang,Hongwei Sun,Guangming Zhan,Junning Zu,Lizhi Zhang
Glyphosate (PMG) is a globally used broad-spectrum herbicide and receives environmental concerns because of its moderate persistence and potential carcinogenicity. Traditional PMG treatment methods often suffer from the generation of a more toxic and persistent aminomethylphosphonic acid (AMPA) intermediate. Herein, we develop a green method with ferrihydrite (FH) and CaO2 (FH/CaO2) via regulating the coordination of PMG with FH and Ca2+, where the phosphonate group of PMG preferentially binds to FH and its carboxylate side complexes with Ca2+ released by CaO2, forming a FH-PMG-Ca ternary surface complex. This unique ternary complex can redistribute electrons within the PMG molecule for its C–P activation and C–N bond stabilization, favoring the selective C–P bond attack of superoxide radical produced by the Fenton reaction between CaO2-derived H2O2 and FH, thus generating environment-friendly glycine instead of AMPA. The FH/CaO2 process realizes over 99% PMG degradation in industrial wastewater within 1 h, with residual PMG < 0.1 ppm and AMPA < 40 ppb. More importantly, the CaO2 consumption was as low as 3.1 mg of CaO2/mg of PMG, one-fifth those of previously reported CaO2-based counterparts. This study provides an effective and environment-friendly PMG treatment strategy and highlights the importance of surface coordination modes on the degradation pathway of PMG.
研究领域:
环境科学
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污染治理
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绿色化学
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DOI
PubMed
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
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2024
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IF 5.5
Fei Yuan,Yuzhong Sun,Jiayi Guo,Yimin Wei,Su Wang,Shuangfei Zhao,Ruiyan Sun,Wei He,Ning Zhu,Yuguang Li,Kai Guo
Background Traditional methods for nanocrystal preparation often suffer from limitations such as poor control over particle size and morphology, low yield and instability. Methods In this study, we developed a novel microreactor technique for the efficient preparation of dasatinib nanocrystals. The microreactor employed was equipped with a circular hole baffle to enhance mixing efficiency. The solvent-antisolvent process was optimized by systematically varying the solvent-to-antisolvent ratio, flow rate, and initial concentration of dasatinib. A binary surfactant system (SDBS/BS-12) was introduced in the anti-solvent phase to further improve the nanocrystal properties. Significant Findings The optimized experimental conditions led to the successful preparation of dasatinib nanocrystals with exceptional properties. The nanocrystals exhibited an average particle size of 85 nm, a zeta potential of 47.5 mV, and a polydispersity index of 0.566, indicating superior dispersion and stability. Compared to conventional methods, the binary surfactant system resulted in a remarkable 6.5–12 times enhancement in nanocrystal shrinkage. The precise control over mixing dynamics within the microreactor enabled the production of high-quality nanocrystals with tailored properties. Furthermore, the simplicity, efficiency, and tunability of the proposed method suggests its potential for scale-up towards high-throughput nanoparticle preparation, broadening its application prospects in various fields.
研究领域:
药学
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纳米技术
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制药工程
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DOI
高影响因子
RSC Advances
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2025
·Vol. 15
·期 14
·10862-10872
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IF 4.6
Muneera Alrasheedi,Salah M. El-Bahy,Refat El-Sayed,Khaled F. Debbabi,Alaa S. Amin
Although modern reported methods, such as AAS, ICP-AES, ICP-MS, have good sensitivity, the high cost of equipment, the need for sophisticated instruments, separation and preconcentration steps and experienced technicians along with lack of precise methods make them cumbersome. Solid phase extraction (SPE) emerges as an attractive technique that reduces solvent consumption, minimizes exposure, shortens extraction time, and lowers disposal costs. Herein, a pioneering methodology for the quantification of minute amounts of silver is introduced, using 2-nitro-6-(thiazol-2-yl-diazenyl)phenol (NTDP) as a complexing agent and Triton X-100 as a nonionic surfactant within a ternary surfactant system at a pH of 5.3. This novel extraction strategy demonstrated selective preconcentration. The enriched solution was subjected to spectrophotometric analysis for the quantification of the analyte. After refining extraction and complexation parameters, a remarkable 250-fold increase in the enrichment factor was attained, highlighting a sensitivity boost of 509 times compared with traditional extraction approaches relying solely on nonionic surfactants. The key parameters of molar absorptivity and Sandell sensitivity were determined to be 6.04 × 106 L mol−1 cm−1 and 0.0018 ng cm−2, respectively. The calibration plot was observed from 5.0–175 ng mL−1, whereas Ringbom optimum concentrations ranged from 15–160 ng mL−1. The detection and quantification limits were 1.63 and 4.95 ng mL−1, respectively. The relative standard deviation (RSD) of the complex was 2.27. The suggested method was efficiently utilized for assessing the Ag+ concentration in real samples, producing acceptable outcomes.
研究领域:
分析化学
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环境科学
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DOI
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Ruize Jia,Ronghao Man,Liannan Shang
The rapid development of mineral resources exploitation and industries has brought a large amount of wastewater containing cadmium (Cd) and arsenic (As) to the environment. Among these, the mining industry has become a major challenge in wastewater treatment due to the coexistence of both pollutants at high concentrations. Developing a sustainable and low-cost adsorbent capable of simultaneously adsorbing both anionic and cationic pollutants is a key breakthrough direction for solving this practical problem. In this study, chitosan-grafted Fe-pillared bentonite (CS@Fe@Bt) was synthesized using natural bentonite, aiming to provide an efficient material for treating Cd and As co-contaminated wastewater (especially mining industry wastewater). Results suggested that the specific surface area (SSA) and total pore volume of Fe-pillared bentonite increased by 1.85 and 1.32 times, respectively, compared with the raw bentonite. Pillaring the bentonite also significantly enhanced its chitosan loading capacity, improving both the structural stability and adsorption performance of CS@Fe@Bt. Kinetic and isothermal adsorption experiments revealed that CS@Fe@Bt possessed a multilayer heterogeneous surface, with Cd and As adsorption following the Pseudo-second-order kinetic model. CS@Fe@Bt showed strong adsorption capacity for both Cd(II) and As(III) when the initial pH i of the solution ranged from 6 to 8. The maximum adsorption capacities ( Q m ) for Cd(II) and As(III) were 80.79 mg·g -1 and 34.90 mg·g -1 , respectively, surpassing most comparable adsorbents. The primary adsorption mechanisms of CS@Fe@Bt in Cd(II) and As(III) co-polluted water included oxidation (57.81% of As(III) was converted to low-toxicity As(V)), electrostatic interactions, and the formation of B-type ternary surface complexes (CS@Fe@Bt-As-Cd). Additional mechanisms included ion exchange, pore adsorption. These findings highlight the potential of CS@Fe@Bt as an effective adsorbent for Cd(II) and As(III) adsorption, providing technical support for addressing practical wastewater treatment challenges.
研究领域:
环境科学
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材料科学
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水处理技术
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污染物修复
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吸附材料
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DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
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2022
·
IF 6.633
Xiaomin Liu,Zhao Chen,Zhenggang Cui
In foam flooding ultralow oil/water IFT and superior foaming performance are usually not compatible, because both are achieved by surfactants at different conditions. In this paper we constitute a mixed surfactant system which can achieve both ultralow oil/water IFT and high foaming performance concurrently by means of synergistic effects between different surfactants. Aiming at the reservoir conditions of Daqing oilfield, China (45 °C, total salinity 6,778 mg/L, pH = 8–9), a ternary surfactant mixture SDS/DTAB/APG at a mole fraction ratio of 0.36/0.24/0.4 was found to be an optimal surfactant system by which ultralow IFT and high foaming performance could be achieved concurrently at wide total concentrations (2–6.5 mM). Specifically, at a total concentration of 5 mM the IFT can be reduced to as low as 2.9 × 10 -5 mN/m whereas the composite foaming index in the presence of crude oil can reach as high as 936 Ls. The SDS/DTAB binary mixture dominates the mixed monolayer at both air/water and oil/water interfaces as indicated by a high pseudo mole fraction of 0.94. The strong attraction between anionic/cationic surfactants endows densely packed monolayers which are responsible for the achievement of low surface tension and ultralow IFT, whereas the nonionic surfactant APG behaves as a solubilizer of the SDS/DTAB binary mixture in bulk as well as a stabilizer of the bubbles and emulsified oil droplets, which synergistically endows a high foaming performance to the ternary surfactant system. Based on the relevant principle more mixed surfactant systems may be found which are significant for improving efficiency of foam flooding.
研究领域:
石油工程
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界面化学
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应用化学
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DOI
高影响因子
AIP Advances
·
2022
·Vol. 12
·期 8
·
IF 1.697
Wei Ming-Zhang,Deng Tian-Song,Zhang Qi,Chen Xi,Cheng Zhiqun,Li Shiqi,Gu Yi-Jie
The roles of CTAB and Ag + have been discovered and given us a deeper understanding of the seed-mediated method in the gold nanorods synthesis. Former work used binary surfactants CTAB + NaOL (sodium oleate) to greatly improve the dimensional tunability and monodispersity of gold nanorods. However, they only used a few of the concentration combinations of the binary surfactants, and the influence of NaOL under this method has not been systematically studied. In this work, we carried out systematic experiments under the variation of NaOL and used transmission electron microscopy and UV–vis-near-infrared spectroscopy to monitor the growth process of the gold nanorods. The results showed that the NaOL contributed to the symmetry breaking process. We discovered the ideal ranges of NaOL concentration under different concentrations of CTAB (10–40 mM). Lower concentrations of NaOL produced many impurities, such as Au spheres, while higher concentrations of NaOL led to the decrease of monodispersity of the obtained gold nanorods. A growth model based on the balance of diffusion/reduction of the growth solution has been proposed in order to explain the formation of the gold nanorods.
研究领域:
材料科学
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纳米技术
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化学
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DOI
高影响因子
APPLIED CLAY SCIENCE
·
2020
·
IF 4.605
Yixuan Yang,Runliang Zhu,Qingze Chen,Haoyang Fu,Qiuzhi He,Jianxi Zhu,Hongping He
Multifunctional adsorbents based on montmorillonite (Mt) have been of highly concerns due to their unique 2D layer structures and impressive co-adsorption performances. To further enhance the support ability and reactivity, a strategy was developed in this study to enable the co-existence of porous nanosilica (PNS) and hydrophobic interlayer spaces in Mt structure, and a novel multifunctional adsorbent (iron modified-acidified organo-Mt, Fe-AOMt) was then synthesized, aiming to simultaneously remove hydrophobic contaminants , oxyanion contaminants and heavy metals in water. The combination of XRD , FTIR and TEM verified the co-existence of amorphous PNS and layered structure (containing intercalated surfactant) in the acidified organo-Mt (AOMt), and results of STEM-EDX revealed uniform distribution of Fe after the further introduction of Fe hydroxides to AOMt. Additionally, pore structure analyses suggested that the acid activation can obviously increase the pore volume and specific surface area of OMt. Batch adsorption experiments revealed that Fe-AOMt as a promising multifunctional adsorbent was able to effectively and simultaneously remove nitrobenzene , phosphate, and Cd(II) in the multi-contaminant system. The synergetic adsorption of phosphate and Cd(II) on Fe-AOMt suggested the formation of ternary surface complexes (≡Fe–P–Cd), while the pH-independent uptake of nitrobenzene was hardly influenced by adsorption of phosphate and Cd(II), implying dissimilar adsorption mechanisms. The co-adsorption mechanism on Fe-AOMt was further revealed via XPS . Our work provided a novel and efficient Mt-based multifunctional adsorbent with a newly-proposed structure, which was a preliminary exploration of diversifying locations and types of active sites in Mt structure.
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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水处理
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）