SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Lu Wang,Yinfeng Li,Qinqin Wang,Lina Zou,Baoxian Ye
With the aid of polyaniline (PANI), multi-wall carbon nanotubes (MWCNTs) were vertically arrayed on electrode surface by Langmuir–Blodgett technology, which was a novel preparation strategy of vertically aligned MWCNTs modified electrode . The proposed method was applied to design a sensitive voltammetric sensor for the determination of daidzein . Compared to the randomly dispersed MWCNTs modified electrode, a lower detection limit (8 × 10 −8 mol L −1 ) and wider linear range (1.0 × 10 −7 –9.0 × 10 −6 mol L −1 ) were achieved by the proposed sensor. The results indicated that the aligned morphology of MWCNTs could effectively facilitate the transportation of electrons and electrolyte ions .
研究领域:
分析化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2020
·
IF 4.389
Jiajie Hu,Xinrui Li,Meng Li,Yazhuo Shang,Yifan He,Honglai Liu
Air pollution has become increasingly serious. Fine particulate matter (PM2.5) is the most well-known air pollutant, which leads to some common respiratory diseases when inhaled into the lungs to certain concentration. However, there is a lack of research on the process of dynamically monitoring the real-time effect of nanoparticles on the pulmonary surfactant monolayer. In this study, the DPPC/DPPG monolayer is prepared by the Langmuir method to simulate the lung surfactant monolayer during respiration and the carbon nanoparticles are introduced to the monolayer under different surface pressures to simulate the real dynamic process of inhaling nanoparticles during breathing. The effect of carbon nanoparticles on the surface behavior of DPPC/DPPG monolayer in real-time was examined in details by a combination of surface pressure (π)-area (A) isotherms, compressibility modulus ( C s - 1 )-surface pressure (π) isotherms and the Brewster angle microscopy (BAM). The results have shown that the introduction of carbon nanoparticles under different surface pressures affects the properties of lipid monolayers. The added carbon nanoparticles under lower surface pressure are easy to penetrate the lipid molecules to inhibit monolayer phase transition. When the carbon nanoparticles are introduced to the monolayer under higher surface pressure, they tend to self-aggregate to reduce the monolayer stability rather than interact with lipid tail chains. This work not only confirms the exotic hydrophobic carbon nanoparticles retain in the DPPC/DPPG monolayer irreversibly and affect the surface behavior of monolayer during respiration, but also opens a new idea for real-time monitoring of the effects of PM2.5 on lung health.
研究领域:
生物物理学
·
医学
✓ 已验证
DOI
PubMed
高影响因子
Journal of the Iranian Chemical Society
·
2023
·
IF 2.4
Fu Qiuping,Hu Jing,Zhou Shaoqi
Graphene oxide@sodium alginate (GO@SA) composites were prepared by combining graphene oxide (GO) with sodium alginate (SA) for adsorption of Pb(II). Fourier-transform infrared spectra (FT-IR) and field emission scanning electron microscopy (FESEM) were used to characterize the structure and morphology of the composites. And the adsorption performance of Pb(II) by GO@SA was studied. The adsorption capacity of Pb(II) by GO@SA increased with the increase of pH and temperature. The adsorption process was consistent with the Langmuir isothermal adsorption model and quasi-second-order kinetic model, and the adsorption process was spontaneous and endothermic. At 303.15 K, the maximum adsorption capacity fitted by the Langmuir isothermal model was 241.5 mg/g.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
Desalination and Water Treatment
·
2015
·
IF 1.173
Yumei Zhang,Lan Yang,Dongtian Wang,Tao Zhang
For resource utilization, water treatment residual sludge (WTRS) and its cerium-modified product (Ce-WTRS) were used as adsorbents to remove F− from aqueous solution. The adsorbent materials were characterized by energy dispersive X-ray, scanning electron microscope, X-ray diffraction, Fourier transform infrared, and specific surface area test techniques. Different experimental conditions such as pH, initial F− concentration, contract time, and temperature were investigated. The appropriate adsorption capacity was achieved in the pH range of 3–9. Adsorption kinetics, isotherm, and thermodynamic studies were used to illustrate the nature of F− onto adsorbents materials. Good fitting of pseudo-second-order kinetics model indicated the chemisorption nature. Further analyses of intra-particle diffusion model were carried out to determine the rate controlling step. It was found that the Langmuir and Temkin isotherm models fitted the experimental data better. The maximum adsorption capacity (qm) determined by Langmuir isotherm model was 15.45 mg/g for Ce-WTRS, 22% higher than WTRS. The negative values of ΔGθ indicated the feasibility and spontaneity of material-fluoride interaction. ΔHθ >0 for Ce-WTRS demonstrated the endothermic nature, while ΔHθ <0 for WTRS suggested an exothermic procedure. Ion exchange and complex reaction were identified as the main mechanism of fluoride adsorption.
研究领域:
环境科学
·
化学工程
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2021
·Vol. 28
·期 6
·1-11
·
IF 3.097
Hassan Muhammad,Afzal Annum,Tariq Muhammad,Ahmed Saad
This report deals with the simple development of a method for the uptake of cadmium ions by polymer adsorbent from the main sources of cadmium like water. The monomer is synthesized by reacting 2,4,6-trichloro-1,3,5-triazine with N(4-aminophenyl)acetamide. The adsorbents synthesis is completed by reacting a synthesized monomer with 1,3,5-tribenzoylchloride, terephthaloyl chloride, and isophthaloyl chloride. The as-synthesized polymer exhibits high molecular mass with narrow molecular weight distribution and good thermal stability. The metal ion adsorption study is established by using atomic absorption spectroscopy at optimized parameters, showing excellent adsorption capacity of polymer adsorbent. Further, the isothermal equilibrium adsorption study reveals the monolayer adoption of the metal ion by the Langmuir model with experimental and theoretical parameters, optimized by the linear regression analysis using the curve fitting tool in MATLAB software.
研究领域:
材料科学
·
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Yuwei Ye,Yangjun Zou,Zilong Jiang,Qiumin Yang,Liyong Chen,Shengda Guo,Hao Chen
N doped carbon dots (N-CDs) were prepared by hydrothermal method in methacrylic acid and n -butylamine precursors. The inhibition behavior of N-CDs on Q235 steel in hydrochloric acid environment was discussed via weight loss test, surface characterizations and electrochemistry measurements. Results showed that the as-prepared N-CDs could effectively protect Q235 steel and the inhibition efficiency reached up to 94.96% at 200 mg/L of N-CDs. In the meantime, the impedance modulus was greatly enhanced and the corrosion current density was reduced by one order of magnitude after the addition of N-CDs. Moreover, it could adhere to the steel surface by diffusion and agglomeration effect, resulting in the formation of adsorption film on steel surface. The adsorption mechanism of N-CDs almost complied with the Langmuir adsorption model, containing chemical and physical adsorptions.
研究领域:
材料科学
·
腐蚀与防护
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2023
·
IF 4.1
Hao Zhu,Wenhui Lin,Liwen Fan
This study focuses on the hydrothermal synthesis of magnetically activated carbon and its efficacy in As(III) adsorption. The successful incorporation of magnetite nanoparticles within the porous carbon structure was confirmed, enriching the adsorbent’s properties. Comprehensive characterization was performed to analyze the pore size distribution, zeta potential at varying pH levels, and thermostability using thermogravimetric analysis. These adsorbents exhibited high As(III) removal efficiency with a uniform pore distribution. The zeta potentials were observed to decrease with an increase in pH, suggesting a relationship between adsorbent charge and pH. Adsorption dynamics were rigorously modeled using pseudo-first-order, pseudo-second-order, Elovich, and intraparticle diffusion models for different adsorbents labeled as a, b, c, and d. Each adsorbent displayed unique fitted parameters, revealing varied adsorption capabilities. The study further explored the adsorption kinetics and found that the pseudo-second-order kinetics model and the Langmuir model were most appropriate for describing the adsorption process. Adsorption thermodynamics was also fitted to elucidate the underlying adsorption mechanisms. For the a, b, c, and d adsorbents, the pseudo-first-order model, the qe (cal) values for the four adsorbents were 434.2, 418.4, 283.5, and 279.5 μg/g, respectively. Take adsorbent a as an example; the qm values for 298, 303, 308, and 313 K were 702, 673, 605, and 589 μg/g, respectively, and KL values of these temperatures were 0.021, 0.031, 0.018, and 0.009 L/μg, respectively. For the Langmuir model, the R2 values at the four temperatures were 0.999, 0.978, 0.985, and 0.993, respectively, which indicated that the Langmuir model showed higher fitness. For the Freundlich model, the KL values (L/μg) at the parameters of these temperatures are 432, 409, 328, and 294, respectively. For the Freundlich model, the 1/n values at temperatures of 298, 303, 308, and 313 K are 0.049, 0.045, 0.052, and 0.035, respectively. For the Freundlich model, the R2 values at parameters of 298, 303, 308, and 313 K are 0.986, 0.989, 0.982, and 0.872, respectively. For the Temkin model, the B values (in J/mol) are 30.93, 0.894, 0.824, and 0.782 at these temperatures, respectively. The KT values (in L/μg) are 1.02 × 106, 0.07 × 106, 0.003 × 106, and 0.002 × 106, respectively. The R2 values are 0.973, 0.958, 0.972, and 0.894, respectively. In the end, the ΔH, ΔS, and ΔG values for different adsorbents were calculated. Collectively, these findings contribute significant insights into the design and application of magnetically activated carbon adsorbents for effective As(III) removal.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Wenhui Gu,Pengfei Bian,Liu Wang,Xinyu Li,Zhiwei Liu,Lukang Ji,Mingli Wang,Tifeng Jiao
Artificial supramolecular materials have found extensive applications in many fields such as biology, chirality, and information science. The Langmuir-Blodgett (LB) film technology, as an effective means of molecular assembly, offers broad prospects for the preparation of functional materials with specific properties. This study focuses on a chiral and amphiphilic molecule - the glutamine-azobenzene molecule (GAZS) composite Langmuir-Blodgett film. Through the LB technique, GAZS molecules were successfully compounded with MB, ST, and RhB subphases to form multi-layer films. The interfacial aggregation behavior of this film was thoroughly explored, and its morphological characteristics and spectral properties were analyzed. The results show that the LB films which are prepared exhibit the same J-aggregation state. The surface-enhanced Raman scattering (SERS) experiment shows that the composite LB films which are prepared have outstanding Raman enhancement performance, with an enhancement factor (EF) of 2.46 × 10 5 . Additionally, the Raman intensity has a relative standard deviation of 12.30 %, which implies that the composite films possess excellent reproducibility and uniformity. Thus, they are suitable for the detection of trace molecules. The circular dichroism spectroscopy proves that the LB films formed after the combination of GAZS molecules and dye subphases exhibit obvious chiral signals, providing some insights into the performance research and application expansion of chiral photo-supramolecular material composite LB films. Through the photoelectric conversion test of transferring multi-layer films onto indium tin oxide (ITO), it is found that the self-assembled LB films exhibit outstanding photoelectrochemical characteristics. The GAZS molecules show a more powerful photoelectric conversion effect. under the RhB subphase, providing a reference for the further exploration of the applications of GAZS molecule composite LB films in optoelectronic devices.
研究领域:
材料科学
·
光化学
·
分子生物学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Xiongchao Liu,Xinyu Li,Xifeng Li,Mingli Wang,Yaru Zhang,Na Xie,Yuangang Li,Tifeng Jiao
In this research, Langmuir-Blodgett (LB) composite films were fabricated by integrating phthalocyanine (Pc) with derivatives of perylene diimide (PDI) and naphthalene diimide (NDI). The potential applications of these films in chemical gas sensing and surface-enhanced Raman spectroscopy (SERS) were investigated. The LB technique enables precise regulation of molecular arrangements within films, rendering them highly effective for applications as sensitive sensors. Upon exposure to NH₃ and HCl gases, the composite films exhibited good sensitivity, demonstrating their potential in chemical sensing applications. By employing R6G as a probe molecule, the films demonstrated remarkable SERS performance, distinguished by their uniformity, reproducibility, and amplified signal intensity, achieving an enhancement factor (EF) of 1.76 × 10⁵. This work demonstrates rapid colorimetric response to NH₃/HCl and achieves a high SERS enhancement factor of 1.76 × 10⁵, confirming the significant potential of these LB films for real-world sensing applications.
✓ 已验证
产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2017
·
IF 5.651
Futao Wang,Yuanfeng Pan,Pingxiong Cai,Tianxiang Guo,Huining Xiao
A high efficient and eco-friendly sugarcane cellulose-based adsorbent was prepared in an attempt to remove Pb 2+ , Cu 2+ and Zn 2+ from aqueous solutions. The effects of initial concentration of heavy metal ions and temperature on the adsorption capacity of the bioadsorbent were investigated. The adsorption isotherms showed that the adsorption of Pb 2+ , Cu 2+ and Zn 2+ followed the Langmuir model and the maximum adsorptions were as high as 558.9, 446.2 and 363.3 mg·g −1 , respectively, in single component system. The binary component system was better described with the competitive Langmuir isotherm model. The three dimensional sorption surface of binary component system demonstrated that the presence of Pb 2+ decreased the sorption of Cu 2+ , but the adsorption amount of other metal ions was not affected. The result from SEM-EDAX revealed that the adsorption of metal ions on bioadsorbent was mainly driven by coordination, ion exchange and electrostatic association.
研究领域:
环境科学
·
生物学
✓ 已验证
DOI
高影响因子
JOURNAL OF SURFACTANTS AND DETERGENTS
·
2025
·
IF 1.8
Lin Liu,Chunxia Wang,Jun Du,Youpeng Zuo,Ligang Zhang,Xiaoxiao Hu,Zhenhua Xu
Metal corrosion has hindered the advancement of new technologies. The surfactant as one kind of corrosion inhibitor can effectively restrain metal corrosion in corrosive medium. In this research, two cationic Gemini surfactants, 3,3′-(ethane-1,2-diyl)bis(1-octyl-1 H -imidazol-3-ium) dibromide ([C 8 im-2-C 8 im]Br 2 ) and 3,3′-(butane-1,4-diyl)bis(1-octyl-1 H -imidazol-3-ium) dibromide ([C 8 im-4-C 8 im]Br 2 ), have been prepared for the corrosion inhibition of carbon steels in 1.0 mol/L HCl solution. The weight loss measurement demonstrates that two inhibitors both achieve high inhibition efficiencyies at concentration of 0.50 mM for carbon steels in 1.0 mol/L HCl solution. By comparison, the anticorrosion performance of [C 8 im-2-C 8 im]Br 2 for carbon steel specimens in 1.0 mol/L HCl solution are better than that of [C 8 im-4-C 8 im]Br 2 , and the maximum corrosion efficiency can reach 96.15% at the temperature of 30°C. The determination of adsorption thermodynamics and kinetics parameters reveals that the adsorption behavior of two inhibitors on the steel surface is chemisorption and follows Langmuir isotherm. Good anticorrosion performance of the inhibitor for carbon steel in HCl solution owes to a dense and compact protective film formed onto the steel surface. It indicates that the proposed cationic Gemini surfactants have great prospect in the corrosion inhibition of metals. Graphical 3,3′-(ethane-1,2-diyl)bis(1-octyl-1 H -imidazol-3-ium) dibromide as a corrosion inhibitor demonstrates good anticorrosion performance for carbon steel in hydrochloric acid solution. The chemical adsorption of the inhibitor onto carbon steel surface enables to form a dense and compact protective layer.
研究领域:
材料科学
·
腐蚀与防护
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL PAPERS
·
2021
·Vol. 76
·期 1
·123-135
·
IF 2.097
Shen Qiang,Xu Min-Hong,Wu Tao,Pan Guo-Xiang,Tang Pei-Song
Accumulation of tetracycline (TC) in soul and aqueous environments threatens the ecology balance and human health. In this work, Magnetic bentonite (MB) modified with two kinds of starch (corn starch and carboxymethyl starch) were synthesized for removal of TC. The composite materials were characterized by XRD, SEM, VSM and FTIR techniques. The adsorption capacities of TC for raw bentonite (RB), magnetic bentonite (MB), corn starch modified magnetic bentonite (ST-MB) and carboxymethyl starch modified magnetic bentonite (CMS-MB) were evaluated with batch adsorption equilibrium experiments. The modeling of isothermal adsorption and kinetic adsorption for four materials was done. The fitting results shows adsorption of CMS-MB composite follows the Langmuir model and pseudo-second model. The CMS-MB composite showed the best adsorption performance with Langmuir theoretical adsorption maximum of 169.7 mg/g. The adsorbent CMS-MB can be easily separated by magnetic force from solution with extremely low turbidity. The adsorption mechanism was also discussed.
研究领域:
环境科学
·
材料科学
·
生物化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）