scholarly journals Aqueous Solution of Ammonium Persulfate Assisted Electrochemical Exfoliation of Graphite into Graphene

2018 ◽  
Author(s):  
D. X. He ◽  
W. D. Xue ◽  
R. Zhao
Keyword(s):  
Aqueous Solution ◽  
Ammonium Persulfate ◽  
Electrochemical Exfoliation

Preparation of Highly Conductive Polyaniline in Carbamide Aqueous Solution Using SnCl4 as Initiator

2012 ◽  
Vol 476-478 ◽  
pp. 2205-2208 ◽  
Author(s):  
Guan Nan Lin ◽  
Qun Yu ◽  
Wei Wang ◽  
Gui Bao Wang
Keyword(s):  
Aqueous Solution ◽  
Ammonium Persulfate ◽  
Conductivity Measurements ◽  
X Ray ◽  
New Class ◽  
Vis Spectroscopy ◽  
Polymerization System ◽  
Novel Method ◽  
Conductive Polyaniline ◽  
Hydrolysis Of

In this paper, we demonstrated a novel method for the preparation of highly conductive polyaniline (PANI) compounded with Sn(OH)4. We obtained the PANI directly in the oxidation polymerization system via simultaneous reaction of aniline (using ammonium persulfate, APS as oxidant) and SnCl4 in carbamide aqueous solution. The resulting PANI was compounded with Sn(OH)4 had been characterized by FTIR, UV-Vis spectroscopy, X-ray diffractometry, thermal analysis, scanning electron microscope and conductivity measurements, and the results showed that PANI was in well doped state due to the hydrolysis of APS and the complex between PANI and Sn(OH)4. We are sure this alkali-guided polymerization to obtain conductive PANI will lead to the preparation of a new class of PANI composites.

scholarly journals Effect of synthesis conditions  on  methylene blue adsorption capacity of electrochemically preparated graphene

2020 ◽  
Vol 9 (3) ◽  
pp. 9-14
Author(s):  
Hao Pham Van ◽  
Linh Ha Xuan ◽  
Oanh Phung Thi ◽  
Hong Phan Ngoc ◽  
Huy Nguyen Nhat ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Adsorption Capacity ◽  
Functional Groups ◽  
Photoelectron Spectroscopy ◽  
Graphene Nanosheets ◽  
Electrochemical Exfoliation ◽  
X Ray ◽  
Synthesis Conditions ◽  
Mb Adsorption

This report presents the effect of synthesis conditions on the synthesis of graphene nanosheets via electrochemical exfoliation method for adsorbing methylene blue from aqueous solution. Oxygen-containing functional groups and defects in the material were characterized by Raman and X-ray photoelectron spectroscopy (XPS). As a result, by using voltage of 15 V, (NH4)2SO4 (5%, 250 mL) and KOH (7.5%, 250 mL), the obtained material showed the highest MB adsorption capacity due to the high densities of oxygen-containing groups and defects comparison to other conditions.

KARBON LİF ÜRETİMİNDE POLİAKRİLONİTRİL ELYAFLARIN TERMAL OKSİDASYONU

2021 ◽  
Vol 8 (17) ◽  
pp. 160-170
Author(s):  
Mahbubor Rahman ◽  
Tuba DEMIREL ◽  
Ismail KARACAN
Keyword(s):  
Thermal Stability ◽  
Aqueous Solution ◽  
Thermal Oxidation ◽  
Oxidation Process ◽  
Ammonium Persulfate ◽  
Oxidation Reactions ◽  
Carbon Yield ◽  
Thermal Stability Of ◽  
Pan Fibers

Thermal oxidation of polyacrylonitrile (PAN) fibers was accomplished at temperatures up to 250°C for different oxidation times. Chemical integration of PAN fibers with an aqueous solution of ammonium persulfate was performed before starting thermal oxidation. The results recommend that ammonium persulfate integration enhanced the oxidation reactions of the PAN fibers and resulting in enhanced thermal stability. Ammonium persulfate impregnation followed by the oxidation process in the air environment leads to significant deviations in the characteristics of PAN fibers. To perform structural characterization of the raw and ammonium persulfate (APS) incorporated and stabilized samples, XRD, IR-spectroscopy, TGA was executed in this study. Investigation of the XRD and infrared spectroscopy outcomes recommended quick aromatization reactions with growing oxidation periods. The TGA traces indicated a comparative enhancement in the thermal stability of the PAN fibers by the increased carbon yield with the rise of the oxidation time. The overall findings recommend that ammonium persulfate incorporation was very influential in stimulating the oxidation process.

Preparation and Characterization of Kenaf-Based Superabsorbent Polymers

2011 ◽  
Vol 183-185 ◽  
pp. 1812-1816
Author(s):  
Dan Wang ◽  
Zhan Qian Song ◽  
Shi Bin Shang ◽  
Zhan Jun Wang ◽  
Myoung Ku Lee
Keyword(s):  
Aqueous Solution ◽  
Acrylic Acid ◽  
Graft Copolymerization ◽  
Ph Value ◽  
Crosslinking Agent ◽  
Ammonium Persulfate ◽  
Deionized Water ◽  
Superabsorbent Polymers ◽  
Saline Solutions

Novel kenaf-based superabsorbent polymers (SAPs) were prepared by grafting acrylic acid (AA) and acrylamide (AM) onto kenaf cellulose. Graft copolymerization was carried out in aqueous solution using N, N’-methylenebisacrylamide (NMBA) as crosslinking agent and sodium bisulfite (NaHSO3) and ammonium persulfate ((NH4)2S2O8) as initiator. The SAPs so obtained were examined by SEM. The absorbency of SAPs consists of different kenaf cellulose in deionized water, saline solutions and different pH value solutions were investigated.

Synthesis and Characterization of Comb-Type Grafted Hydrogels

2012 ◽  
Vol 602-604 ◽  
pp. 1274-1284
Author(s):  
Ping Zhang ◽  
Shi Pu Li ◽  
Xin Yu Wang ◽  
Hong Lian Dai
Keyword(s):  
Aqueous Solution ◽  
Fluorescence Spectroscopy ◽  
Lower Critical Solution Temperature ◽  
Ammonium Persulfate ◽  
Solution Temperature ◽  
Synthesis And Characterization ◽  
Critical Solution Temperature

The grafted hydrogels of N-isopropylacrylamide (IPAAm) with 2-hydroxyethylacrylate (HEA) was prepared in an aqueous solution using ammonium persulfate (APS) and N,N,N’,N’-tetramethylethylene diamine (TEMED) as an accelerator. Lower critical solution temperature (LCST) and swelling ratios were measured as a function of temperature. The properties of the hydrogels contained pyrenyl probe in water were investigated by fluorescence spectroscopy.

Production of graphene powder by electrochemical exfoliation of graphite electrodes immersed in aqueous solution

Optik ◽  
2016 ◽  
Vol 127 (16) ◽  
pp. 6384-6389 ◽  
Author(s):  
Raneen Imad Jibrael ◽  
Mustafa K.A. Mohammed
Keyword(s):  
Aqueous Solution ◽  
Electrochemical Exfoliation ◽  
Graphite Electrodes

scholarly journals Electrochemical exfoliation for few-layer graphene in molybdate aqueous solution and its application for fast electrothermal film

2020 ◽  
Vol 30 (3) ◽  
pp. 312-320
Author(s):  
Juan Wu ◽  
Hongfei Wang ◽  
Jun Qiu ◽  
Jingwen Shao ◽  
Kefu Zhang ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Electrochemical Exfoliation ◽  
Layer Graphene ◽  
Few Layer Graphene

The Synthesis of Graphene Oxide via Electrochemical Exfoliation Method

2015 ◽  
Vol 1109 ◽  
pp. 55-59 ◽  
Author(s):  
Nurhafizah Md Disa ◽  
Suriani Abu Bakar ◽  
S. Alfarisa ◽  
Azmi Mohamed ◽  
Illyas Md Isa ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Scanning Electron Microscopy ◽  
Graphene Oxide ◽  
Sodium Dodecyl ◽  
Electrochemical Exfoliation ◽  
Spectra Analysis ◽  
X Ray ◽  
Vis Spectroscopy ◽  
Scanning Electron

In this study, electrochemical exfoliation method was adopted in the production of graphene oxide (GO). The electrolyte used was sodium dodecyl sulphate (SDS) aqueous solution at various concentrations from 0.001 to 1.0 M. The effect of SDS concentrations on the morphology of GO samples were characterized using field emission scanning electron microscopy (FESEM), energy dispersive X-ray, micro-Raman and UV-Vis spectroscopy. As evident by the FESEM analysis, the concentration of SDS does give effect to the GO obtained in this study. The lowest GO production is given by the lowest concentration of SDS used which is 0.001 M. However, in term of ID/IGratio, the sample prepared at 0.001 M has the lowest value (0.33) as compared to the sample prepared with highest SDS concentration of 1.0 M (ID/IG~1.12). Meanwhile, the presence of absorbance peaks in the range of 224-237 nm from UV-Vis spectra analysis were seen for the whole samples and this indicate the formation of GO.

Preparation of polyaniline nanofibers using the organic solution of aniline as seed

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Shuangxi Xing ◽  
Hongwei Zheng
Keyword(s):  
Aqueous Solution ◽  
Ir Spectra ◽  
Organic Solvents ◽  
Ammonium Persulfate ◽  
Conductivity Measurements ◽  
Organic Solution ◽  
Polyaniline Nanofibers ◽  
Pani Nanofibers ◽  
Ft Ir

AbstractPolyaniline (PANI) nanofibers were prepared using an organic solution of aniline as seed in aqueous solution of ammonium persulfate oxidant. Two types of organic solvents were used, which are miscible and immiscible with water to investigate their effect on the properties of the resulting PANI via the aid of SEM, UV-Vis and FT-IR spectra and conductivity measurements The water dispersity of the polymer was also discussed based on the UV-Vis spectra data. Two possible mechanisms were proposed to explain the formation of the PANI nanofibers during the seed polymerization.

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