scholarly journals Studies on the Mechanism of Cu(II) Ion Sorption on Purolite S 940 and Purolite S 950

Materials ◽  
2021 ◽  
Vol 14 (11) ◽  
pp. 2915
Author(s):  
Weronika Sofińska-Chmiel ◽  
Dorota Kołodyńska ◽  
Agnieszka Adamczuk ◽  
Aleksander Świetlicki ◽  
Marta Goliszek ◽  
...  
Keyword(s):  
Functional Groups ◽  
Photoelectron Spectroscopy ◽  
Copper Ion ◽  
Sorption Process ◽  
Process Efficiency ◽  
Sorption Mechanism ◽  
Xps Spectra ◽  
Ion Sorption ◽  
Before And After ◽  
Microscopic Studies

The aim of the presented research was to investigate the mechanism of sorption of Cu(II) ions on the commercially available Purolite S 940 and Purolite S 950 chelating ion exchangers with the aminophosphonic functional groups. In order to understand better the sorption mechanism, the beads were cut with an ultramicrotome before and after the Cu(II) ion sorption process. The cut beads were examined by scanning electron microscopy (SEM) with an EDX detector. The performed linear profiles of the elemental composition allowed us to examine the depth with which the sorbed metal penetrates into. For further investigations concerning the mechanism of the sorption process, the Fourier transform infrared spectroscopy (FTIR) analysis using the attenuated total reflectance (ATR) technique and the X-ray photoelectron spectroscopy (XPS) methods have been used. The comparison of FTIR and XPS spectra before and after the sorption of Cu(II) ions showed that free electron pairs from nitrogen and oxygen in the aminophosphonic functional groups participate in the process of copper ion sorption. In addition, the microscopic studies suggested that the process of ion exchange between Na(I) ions and sorbed Cu(II) ions takes place on the Purolite S 940 and Purolite S 950. This study concerning the in-depth understanding the of Cu(II) sorption mechanism, using modern analytical tools and research methods could be very useful for its further modifications leading to the improvement of the process efficiency.

Surface Functionalisation of Polyester Nonwoven Fabrics by Sputter Coating of Titanium Dioxide

2009 ◽  
Vol 17 (6) ◽  
pp. 347-351 ◽  
Author(s):  
Yang Xu ◽  
Ning Wu ◽  
Qufu Wei ◽  
Libo Chu
Keyword(s):  
Titanium Dioxide ◽  
Photoelectron Spectroscopy ◽  
Chemical Compositions ◽  
Sem Images ◽  
Xps Spectra ◽  
Force Microscopy ◽  
Nonwoven Fabrics ◽  
Significant Difference ◽  
Sputter Coating ◽  
Before And After

Titanium dioxide (TiO2) functional films were deposited on the surface of polyester nonwoven fabrics at room temperature by direct current (DC) reactive magnetron sputtering. Atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS) were employed to study the topographies and chemical compositions of the functional fabric surfaces, respectively. Scanning electron microscopy (SEM) was used to investigate the interfacial microstructures and adhesion between the substrate and TiO2 coating. The AFM observations indicated that there was a significant difference in the surface morphology of the polyester fibres before and after TiO2 sputter coating. XPS spectra reflected the chemical features of the deposited TiO2 nanostructures. The SEM images showed that TiO2 thin films deposited on the substrate under confirmed processing conditions had unique, fine surfaces and good adhesion to the substrate. It was found that the deposition of TiO2 on the polyester nonwoven fabrics significantly improved their ultraviolet (UV) absorption and antistatic properties.

scholarly journals Effect of VUV Radiation on Surface Modification of Polystyrene Exposed to Atmospheric Pressure Plasma Jet

Polymers ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1136 ◽  
Author(s):  
Rok Zaplotnik ◽  
Alenka Vesel
Keyword(s):  
Functional Groups ◽  
Photoelectron Spectroscopy ◽  
Polymer Surface ◽  
Argon Plasma ◽  
Plasma Jet ◽  
Contact Angles ◽  
Surface Wettability ◽  
Water Contact ◽  
Xps Spectra ◽  
Sharp Interfaces

Precise tailoring of surface properties by gaseous plasma treatments remains a key scientific challenge, especially when adequate surface wettability should be laterally distributed, and sharp interfaces between hydrophobic and hydrophilic areas are desirable. The evolution of surface wettability and functional groups on polystyrene (PS) upon treatment with argon plasma jet was monitored by water contact angles and X-ray photoelectron spectroscopy (XPS). An array of water droplets was deposited on PS samples treated either directly by the plasma jet or only VUV radiation arising from the plasma. Rather sharp interfaces between the activated and not-affected regions were observed in both cases. The functionalization with highly-oxidized carbon functional groups, as determined by high-resolution C1s XPS spectra, was by far more efficient using the VUV radiation only. In contrast, the optimal wettability was achieved using direct plasma treatment. The results were explained by different mechanisms involved in the interaction of radiation and reactive plasma species with the polymer surface.

CHEMISORPTION OF L-CYSTEINE ON Au(111)/Si(111) AND $Si(111)\sqrt{3} \times \sqrt{3}-{\rm Au}$ SURFACES

2006 ◽  
Vol 13 (02n03) ◽  
pp. 197-200 ◽  
Author(s):  
MITSUNORI HONDA ◽  
FUMIHIKO MATSUI ◽  
HIROSHI DAIMON
Keyword(s):  
Chemical Shift ◽  
Photoelectron Spectroscopy ◽  
Electronic Structures ◽  
The Other ◽  
Cooh Group ◽  
Xps Spectra ◽  
X Ray ◽  
Peak Intensity ◽  
Before And After ◽  
Intensity Ratios

The electronic structures of L-cysteine adsorbed on Au (111)/ Si (111) and [Formula: see text] surfaces were studied by using X-ray photoelectron spectroscopy (XPS). L-cysteine multilayers on Au (111)/ Si (111) and [Formula: see text] surfaces were prepared under UHV condition. L-cysteine monolayers were obtained by annealing such multilayer sample up to 130°C. In the case of the Au (111)/ Si (111) surface, we observed no chemical shift and no change in the peak intensity ratios among C1s , N1s , O1s and S 2p before and after annealing. On the other hand, the component attributed to COOH group in C1s spectra decreased after annealing. In addition, O1s XPS spectra of monolayer on the [Formula: see text] surface was composed of two distinct peaks, which indicates that there are two kinds of O atoms in different conformations. These observations indicate that the COOH group adsorbs directly to a surface atoms and dissociate by the interaction with the substrate Si (111) trimer atoms.

The Study of SiC Surface Cleaning by Hydrogen Plasma

2013 ◽  
Vol 473 ◽  
pp. 61-64
Author(s):  
Su Hua Chen
Keyword(s):  
Plasma Treatment ◽  
Photoelectron Spectroscopy ◽  
Treatment Time ◽  
Hydrogen Plasma ◽  
Surface Cleaning ◽  
Plasma System ◽  
Xps Spectra ◽  
X Ray ◽  
Surface Oxides ◽  
Before And After

The SiC surfaces were cleaned by the hydrogen plasma with ECRPEMOCVD plasma system at low temperature of 200°C, after the traditional wet cleaning. The surfaces were investigated by RHEED and X-ray Photoelectron Spectroscopy before and after hydrogen plasma treatment. The RHEED imagines showed that the SiC surfaces by hydrogen plasma treatment were more flatter than the SiC surfaces by the traditional wet cleaning, and we found the result that more treatment time, more flatter. The XPS spectra examinations indicated that the surface oxides reduced obviously and the C/C-H compounds on the SiC surface were removed by hydrogen plasma treatment, so the antioxidant ability of the SiC surface was improved.

Mechano-Chemical Modification of Nanodiamond with GW

2008 ◽  
Vol 375-376 ◽  
pp. 87-91
Author(s):  
Yong Wei Zhu ◽  
Xiang Yang Xu ◽  
Bai Chun Wang ◽  
Jian Liang Shen
Keyword(s):  
Fourier Transform ◽  
Chemical Modification ◽  
Photoelectron Spectroscopy ◽  
Silane Coupling Agent ◽  
Xps Spectra ◽  
X Ray ◽  
Silane Coupling ◽  
Before And After ◽  
New Type ◽  
Ft Ir

Mechano-chemical modification (MCM) of nanodiamond was conducted with a stirring mill. A new type of silane coupling agent, GW was chosen as its modifier. X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FT-IR) were employed to study the surface properties of nanodiamond before and after treatments. Results showed that the peaks related to GW and the ball (for example, Fe, Si and Cl) appeared obviously after its MCM on their XPS spectra and mostly disappeared after its further purification with acid X or Y. A new peak located at 1382.48cm-1 was very strong after further purification. It was proven by their FT-IR spectra.

scholarly journals Biosorption of methylene blue by nonliving biomass of the brown macroalga Sargassum hemiphyllum

2017 ◽  
Vol 76 (6) ◽  
pp. 1574-1583 ◽  
Author(s):  
Jianfeng Liang ◽  
Jianrong Xia ◽  
Jianyou Long
Keyword(s):  
Methylene Blue ◽  
Functional Groups ◽  
Photoelectron Spectroscopy ◽  
Algal Biomass ◽  
Order Kinetic ◽  
Before And After ◽  
Initial Ph ◽  
Order Kinetic Model ◽  
Ft Ir ◽  
Sargassum Hemiphyllum

The ability of Sargassum hemiphyllum to remove methylene blue (MB) from aqueous solution was evaluated. Batch experiments were conducted to examine the effects of parameters such as initial pH, contact time, biomass dose and initial dye concentration on adsorption capacity. S. hemiphyllum before and after MB adsorption was characterized by Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The Langmuir isotherm model provided the best correlation with experimental data, and the monolayer biosorption capacity was 729.93 mg·g−1 within 120 min using 0.5 g·L−1 algal biomass and pH of 5. The pseudo-second-order kinetic model accurately described the adsorption kinetics data. Thermodynamic parameters (ΔG0, ΔH0 and ΔS0) at temperature ranges of 293–313 K demonstrated that biosorption is an endothermic and spontaneous reaction. FT-IR analysis showed that the hydroxyl, amine and carboxyl functional groups on the surface of the algae were the most important functional groups for biosorption of MB. XPS analysis indicated that the algal biomass combined with MB molecules through –NH2 groups. These results suggest that S. hemiphyllum is a favorable biosorbent for removing MB dye from wastewater.

scholarly journals Biodegradation of textile dye using consortium of bacterial strains isolated from industrial dye effluent

2020 ◽  
Author(s):  
H. S. El-Sheshtawy ◽  
M. Abdelkreem
Keyword(s):  
Dye Decolorization ◽  
Degradation Process ◽  
Sorption Process ◽  
Process Efficiency ◽  
Textile Dye ◽  
Bacterial Strains ◽  
Terrestrial Environment ◽  
Physico Chemical ◽  
Before And After ◽  
Good Potential

Abstract Dyes are discharged into water through many industries such as textile industries. Disposal of these dyes into the aquatic and terrestrial environment causes serious damage. Remarkable, processes for the treatment of dye waste involve biological remediation, catalytic oxidation, filtration, and sorption process. In this study the textile industrial dye effluent was treated using biodegradation method. The degradation of dye wastewater was determined by pure bacteria and its consortium isolated from textile effluent. Three different bacterial spp. were isolated and subjected to dye decolorization assays. The isolates were identified by 16sRNA as Aeromonas aquatic AE 235, Flavobacterium ginsengiterrae DCY55, Shewanella xiamenensis S4. The percentage decolorization process was detected by UV spectrophotometer. This process was obtained at 90, 94, 95 and 98% respectively by pure of three bacterial strains B1, B2, and B3 and its consortium BC. The degradation process of dye effluent was confirmed by FTIR analysis. The physico-chemical analysis of the effluent sample was investigated before and after biodegradation treatment to emphasize the process efficiency. The results indicated that these bacterial strains have good potential for the biodegradation of dye from textile waste water.

Sorption of Bisphenol A in Aqueous Solutions on Irradiated and as-Grown Multiwalled Carbon Nanotubes

2018 ◽  
Vol 69 (5) ◽  
pp. 1233-1239
Author(s):  
Raluca Madalina Senin ◽  
Ion Ion ◽  
Ovidiu Oprea ◽  
Rusandica Stoica ◽  
Rodica Ganea ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Bisphenol A ◽  
Aqueous Solutions ◽  
Adsorption Capacity ◽  
Multiwalled Carbon Nanotubes ◽  
Adsorption Process ◽  
Sorption Process ◽  
Multiwalled Carbon ◽  
Before And After ◽  
Kinetic Sorption

In this study, non-irradiated and weathered multiwalled carbon nanotubes (MWCNTs) obtained through irradiation, were studied as adsorbents for BPA, both nanomaterials being characterized before and after the adsorption process. The objectives of our investigation were to compare the characteristics of non-irradiated and irradiated MWCNTs, to evaluate the adsorption capacity of BPA by pristine and irradiated MWCNTs and to determine the variation of the kinetic, sorption and thermodynamic parameters during sorption process using both sorbents.

scholarly journals Effect of sizing agent on interfacial properties of carbon fiber-reinforced PMMA composite

2021 ◽  
Vol 30 ◽  
pp. 2633366X2097865
Author(s):  
Li Jian
Keyword(s):  
Shear Strength ◽  
Surface Treatment ◽  
Photoelectron Spectroscopy ◽  
Resin Composite ◽  
Contact Angles ◽  
Static Contact ◽  
Before And After ◽  
C Value ◽  
Interlayer Shear Strength ◽  
Pmma Resin

The surface treatment of carbon fibers (CFs) was carried out using a self-synthesized sizing agent. The effects of sizing agent on the surface of CFs and the interface properties of CF/polymethyl methacrylate (PMMA) composites were mainly studied. Scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and static contact angle were used to compare and study the CFs before and after the surface treatment, including surface morphology, surface chemical element composition, and wettability of the surface. The influence of sizing agent on the mechanical properties of CF/PMMA resin composite interface was investigated. The results show that after sizing treatment, the CF surface O/C value increased by 35.1% and the contact angles of CF and resin decreased by 16.2%. The interfacial shear strength and interlayer shear strength increased by 12.6%.

scholarly journals Optical, XPS and XRD Studies of Semiconducting Copper Sulfide Layers on a Polyamide Film

2009 ◽  
Vol 2009 ◽  
pp. 1-8 ◽  
Author(s):  
Valentina Krylova ◽  
Mindaugas Andrulevičius
Keyword(s):  
Photoelectron Spectroscopy ◽  
Copper Sulfide ◽  
Diffusion Method ◽  
X Ray Diffraction ◽  
Xps Spectra ◽  
X Ray ◽  
Xrd Studies ◽  
Polyamide Film ◽  
Indirect Band Gap ◽  
Xrd Method

Copper sulfide layers were formed on polyamide PA 6 surface using the sorption-diffusion method. Polymer samples were immersed for 4 and 5 h in 0.15 mol⋅  solutions and acidified with HCl (0.1 mol⋅) at . After washing and drying, the samples were treated with Cu(I) salt solution. The samples were studied by UV/VIS, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) methods. All methods confirmed that on the surface of the polyamide film a layer of copper sulfide was formed. The copper sulfide layers are indirect band-gap semiconductors. The values of are 1.25 and 1.3 eV for 4 h and 5 h sulfured PA 6 respectively. Copper XPS spectra analyses showed Cu(I) bonds only in deeper layers of the formed film, while in sulfur XPS S 2p spectra dominating sulfide bonds were found after cleaning the surface with ions. It has been established by the XRD method that, beside , the layer contains as well. For PA 6 initially sulfured 4 h, grain size forchalcocite, , was  nm and fordjurleite, , it was 54.17 nm. The sheet resistance of the obtained layer varies from 6300 to 102 .

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