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 Adsorptive Removal of Phosphate from Aqueous Solutions Using Low-Cost Volcanic Rocks: Kinetics and Equilibrium Approaches

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1312
Author(s):  
Dereje Tadesse Mekonnen ◽  
Esayas Alemayehu ◽  
Bernd Lennartz
Keyword(s):  
Aqueous Solutions ◽  
Low Income ◽  
Low Cost ◽  
Volcanic Rocks ◽  
Phosphate Removal ◽  
Phosphate Adsorption ◽  
Adsorptive Capacity ◽  
Batch Adsorption ◽  
Order Kinetic ◽  
Adsorptive Removal

The contamination of surface and groundwater with phosphate originating from industrial and household wastewater remains a serious environmental issue in low-income countries. Herein, phosphate removal from aqueous solutions was studied using low-cost volcanic rocks such as pumice (VPum) and scoria (VSco), obtained from the Ethiopian Great Rift Valley. Batch adsorption experiments were conducted using phosphate solutions with concentrations of 0.5 to 25 mg·L−1 to examine the adsorption kinetic as well as equilibrium conditions. The experimental adsorption data were tested by employing various equilibrium adsorption models, and the Freundlich and Dubinin-Radushkevich (D-R) isotherms best depicted the observations. The maximum phosphate adsorption capacities of VPum and VSco were calculated and found to be 294 mg·kg−1 and 169 mg·kg−1, respectively. A pseudo-second-order kinetic model best described the experimental data with a coefficient of correlation of R2 > 0.99 for both VPum and VSco; however, VPum showed a slightly better selectivity for phosphate removal than VSco. The presence of competitive anions markedly reduced the removal efficiency of phosphate from the aqueous solution. The adsorptive removal of phosphate was affected by competitive anions in the order: HCO3− >F− > SO4−2 > NO3− > Cl− for VPum and HCO3− > F− > Cl− > SO4−2 > NO3− for VSco. The results indicate that the readily available volcanic rocks have a good adsorptive capacity for phosphate and shall be considered in future studies as test materials for phosphate removal from water in technical-scale experiments.

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 A Kinetic Study of Poly(acrylic acid)–Copper(II) Interactions in Aqueous Solutions

1982 ◽  
Vol 55 (11) ◽  
pp. 3413-3416 ◽  
Author(s):  
Ryuichi Yamada ◽  
Kiyoshi Tamura ◽  
Shoji Harada ◽  
Tatsuya Yasunaga
Keyword(s):  
Acrylic Acid ◽  
Aqueous Solutions ◽  
Kinetic Study ◽  
Poly Acrylic Acid
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