scholarly journals Simultaneous Adsorption of Cationic Dyes from Binary Solutions by Thiourea-Modified Poly(acrylonitrile-co-acrylic acid): Detailed Isotherm and Kinetic Studies

Materials ◽  
2019 ◽  
Vol 12 (18) ◽  
pp. 2903 ◽  
Author(s):  
Adeyi ◽  
Jamil ◽  
Abdullah ◽  
Choong ◽  
Lau ◽  
...  
Keyword(s):  
Binary System ◽  
Acrylic Acid ◽  
Kinetic Studies ◽  
Antagonistic Effect ◽  
Molecular Structures ◽  
Cationic Dyes ◽  
Simultaneous Adsorption ◽  
Equilibrium Analyses ◽  
Experimental Findings ◽  
Poly Acrylonitrile

In this study, simultaneous adsorption of cationic dyes was investigated by using binary component solutions. Thiourea-modified poly(acrylonitrile-co-acrylic acid) (TMPAA) polymer was used as an adsorbent for uptake of cationic dyes (malachite green, MG and methylene blue, MB) from aqueous solution in a binary system. Adsorption tests revealed that TMPAA presented high adsorption of MG and MB at higher pH and higher dye concentrations. It suggested that there are strong electrostatic attractions between the surface functional groups of the adsorbent and cationic dyes. The equilibrium analyses explain that both extended Langmuir and extended models are suitable for the description of adsorption data in the binary system. An antagonistic effect was found, probably due to triangular (MG) and linear (MB) molecular structures that mutually hinder the adsorption of both dyes on TMPAA. Besides, the kinetic studies for sorption of MG and MB dyes onto adsorbent were better represented by a pseudo-second-order model, which demonstrates chemisorption between the polymeric TMPAA adsorbent and dye molecules. According to experimental findings, TMPAA is an attractive adsorbent for treatment of wastewater containing multiple cationic dyes.

scholarly journals Insights into the p-nitrophenol adsorption by amidoxime-modified poly(acrylonitrile-co-acrylic acid): characterization, kinetics, isotherm, thermodynamic, regeneration and mechanism study

RSC Advances ◽  
2021 ◽  
Vol 11 (14) ◽  
pp. 8150-8162
Author(s):  
Shihab Ezzuldin M. Saber ◽  
Siti Nurul Ain Md Jamil ◽  
Luqman Chuah Abdullah ◽  
Thomas Shean Yaw Choong ◽  
Teo Ming Ting
Keyword(s):  
Acrylic Acid ◽  
Aqueous Solutions ◽  
Adsorptive Capacity ◽  
Mechanism Study ◽  
Poly Acrylonitrile

This study performs an appraisal of the adsorptive capacity of amidoxime-modified poly(acrylonitrile-co-acrylic acid) for the p-nitrophenol (PNP) adsorption, from aqueous solutions.

scholarly journals Pretreatment, Anaerobic Codigestion, or Both? Which Is More Suitable for the Enhancement of Methane Production from Agricultural Waste?

Molecules ◽  
2021 ◽  
Vol 26 (14) ◽  
pp. 4175
Author(s):  
Lütfiye Dumlu ◽  
Asli Seyhan Ciggin ◽  
Stefan Ručman ◽  
N. Altınay Perendeci
Keyword(s):  
Anaerobic Digestion ◽  
Methane Production ◽  
Agricultural Waste ◽  
Kinetic Studies ◽  
Antagonistic Effect ◽  
Hydrolysis Rate ◽  
Order Kinetic ◽  
Maximum Enhancement ◽  
Mixing Ratios ◽  
Anaerobic Codigestion

Pretreatment and codigestion are proven to be effective strategies for the enhancement of the anaerobic digestion of lignocellulosic residues. The purpose of this study is to evaluate the effects of pretreatment and codigestion on methane production and the hydrolysis rate in the anaerobic digestion of agricultural wastes (AWs). Thermal and different thermochemical pretreatments were applied on AWs. Sewage sludge (SS) was selected as a cosubstrate. Biochemical methane potential tests were performed by mixing SS with raw and pretreated AWs at different mixing ratios. Hydrolysis rates were estimated by the best fit obtained with the first-order kinetic model. As a result of the experimental and kinetic studies, the best strategy was determined to be thermochemical pretreatment with sodium hydroxide (NaOH). This strategy resulted in a maximum enhancement in the anaerobic digestion of AWs, a 56% increase in methane production, an 81.90% increase in the hydrolysis rate and a 79.63% decrease in the technical digestion time compared to raw AWs. On the other hand, anaerobic codigestion (AcoD) with SS was determined to be ineffective when it came to the enhancement of methane production and the hydrolysis rate. The most suitable mixing ratio was determined to be 80:20 (Aws/SS) for the AcoD of the studied AWs with SS in order to obtain the highest possible methane production without any antagonistic effect.

Microporous Carbon Nanofibers Derived from Poly(acrylonitrile‐ co ‐acrylic acid) for High‐Performance Supercapacitors

2020 ◽  
Vol 26 (15) ◽  
pp. 3326-3334 ◽  
Author(s):  
Jiye Li ◽  
Xin Song ◽  
Weimiao Zhang ◽  
Hao Xu ◽  
Teng Guo ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Carbon Nanofibers ◽  
High Performance ◽  
Microporous Carbon ◽  
Poly Acrylonitrile

Preparation and Surface Modification of Poly(acrylonitrile-co-acrylic acid) Electrospun Nanofibrous Membranes

2008 ◽  
Vol 61 (6) ◽  
pp. 446 ◽  
Author(s):  
Ai-Fu Che ◽  
Xiao-Jun Huang ◽  
Zhen-Gang Wang ◽  
Zhi-Kang Xu
Keyword(s):  
Surface Modification ◽  
Acrylic Acid ◽  
Photoelectron Spectroscopy ◽  
Platelet Adhesion ◽  
Coupling Reaction ◽  
Processing Parameters ◽  
Electrospinning Technique ◽  
Nanofibrous Membranes ◽  
Atr Spectroscopy ◽  
Poly Acrylonitrile

Poly(acrylonitrile-co-acrylic acid) (PANCAA) was synthesized and fabricated into nanofibrous membranes by an electrospinning technique. Scanning electron microscopy revealed that membranes composed of uniformly thin and smooth nanofibres were obtained under optimized processing parameters. Surface modification with chitosan on these nanofibrous membranes was accomplished by a coupling reaction between the carboxylic groups of PANCAA and the primary amino groups of chitosan. Fluorescent labelling, weight measurement, FT-IR/ATR spectroscopy, and X-ray photoelectron spectroscopy (XPS) were used to confirm the modification process and determine the immobilization degree of chitosan. Platelet adhesion experiments were further carried out to evaluate the hemocompatibility of the studied nanofibrous membranes. Preliminary results indicated that the immobilization of chitosan on the PANCAA nanofibrous membranes was favourable for platelet adhesion.

scholarly journals Hydrophilic thiourea-modified poly(acrylonitrile-co-acrylic acid) adsorbent: preparation, characterization, and dye removal performance

2019 ◽  
Vol 28 (6) ◽  
pp. 483-491 ◽  
Author(s):  
Abel A. Adeyi ◽  
Siti N. A. M. Jamil ◽  
Luqman C. Abdullah ◽  
Thomas S. Y. Choong
Keyword(s):  
Acrylic Acid ◽  
Dye Removal ◽  
Poly Acrylonitrile

Adsorption of Dyes onto Sodium Alginate Graft Poly(Acrylic Acid-co-2-Acrylamide-2-Methyl Propane Sulfonic Acid)/ Kaolin Hydrogel Composite

2017 ◽  
Vol 25 (8) ◽  
pp. 627-634 ◽  
Author(s):  
Linhui Zhu ◽  
Chengdong Guan ◽  
Bin Zhou ◽  
Zhentao Zhang ◽  
Rui Yang ◽  
...  
Keyword(s):  
Acrylic Acid ◽  
Sodium Alginate ◽  
Xylenol Orange ◽  
Methyl Violet ◽  
Cationic Dyes ◽  
Anionic Dyes ◽  
Hydrogel Composite ◽  
Adsorption Capacities ◽  
Initial Ph ◽  
Poly Acrylic Acid

Adsorption of four dyes, namely methyl violet (MV), rhodamine 6G (R6G), acid chrome blue K (AK) and xylenol orange (XO) onto sodium alginate graft poly(acrylic acid-co-2-acrylamide-2-methyl-1-propanesulfonicacid)/kaolin (SA-g-P(AA-co-AMPS)/KL) hydrogel composite is studied. The factors influencing the adsorption capacities, including the initial concentrations of dye solutions, contact time, initial pH values and dosage of the adsorbent as well as ionic strength of the solution are discussed. It is more effective for the composite to adsorb cationic dyes such as MV and R6G rather than anionic dyes AK and XO. The maximum adsorption capacities of MV, R6G, AK and XO are 1361.1, 1627.8, 563.5 and 312.4 mg/g, respectively. The adsorption thermodynamics for the four dyes are in accordance with both the Freudlich and Redlich-Peterson equations. It is shown that adsorption of the cationic dyes R6G and MV is spontaneous, while that of anionic dyes AK and XO is not. The kinetics studies show that the adsorption of the four dyes fitted a pseudo-second-order equation.

1,2-Di(silyl)benzene and 1,4-Dibromo-2,5-di(silyl)benzene

1994 ◽  
Vol 49 (8) ◽  
pp. 1036-1040 ◽  
Author(s):  
Robert Schröck ◽  
Alexander Sladek ◽  
Hubert Schmidbaur
Keyword(s):  
Methanesulfonic Acid ◽  
Intermediate Compound ◽  
Molecular Structures ◽  
High Yield ◽  
Electronic Effects ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Yields ◽  
Experimental Findings ◽  
Silylation Reaction

1,2-Di(silyl)benzene (3), has been prepared in a three-step process starting with the reac­tion of 1,2-dibromobenzene and p-tolyl(chloro)silane with magnesium in tetrahydrofuran. which affords 1,2-bis(p-tolylsilyl)benzene (1) as a stable high-yield intermediate. Compound 1 has been converted into 1,2-bis(trifluoromethanesulfonatosilyl)benzene (2) with trifluoro- methanesulfonic acid, and finally into 3 by reduction with lithiumaluminiumhydride, both again in high yields. - In an attempt to prepare 1,2,4,5-tetra(silyl)benzene in an analogous way. only the bis-silylated species could be obtained (from 1,2,4,5-C6H2Br4. p-MeC6H4SiClH2 and Mg powder: 1,4-dibromo-2,5-bis(p-tolylsilyl)benzene. 4, and 1,4-dibromo-2,5-di(silyl)- benzene, 6, via 1,4-dibromo-2,5-bis(trifluoromethanesulfonatosilyl)benzene, 5). The crystal structures of compounds 4 and 6 have been determined by X-ray diffraction. The results indicate no steric hindrance in these molecules and it is thus not obvious from the molecular structures why the silylation reaction does not proceed any further to give the tetrasilylated benzene derivatives. Electronic effects have to be invoked to rationalize the experimental findings.

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