Preparation of a zwitterionic polymer based on l-cysteine for recovery application of precious metals

RSC Advances ◽  
2016 ◽  
Vol 6 (110) ◽  
pp. 108689-108696 ◽  
Author(s):  
Huseyin Akbulut ◽  
Shuhei Yamada ◽  
Takeshi Endo
Keyword(s):  
Aqueous Solution ◽  
Aqueous Media ◽  
Precious Metals ◽  
High Recovery ◽  
Styrene Monomer ◽  
Zwitterionic Polymer

l-Cysteine-grafted polystyrene was synthesized from a cysteine-styrene monomer (Cys-Sty) in aqueous solution and used as a facile and selective high-recovery material for palladium(ii), platinum(iv), and gold(iii) ions from aqueous media.

Highly efficient and selective photocatalytic CO2 to CO conversion in aqueous solution

2020 ◽  
Vol 56 (27) ◽  
pp. 3851-3854 ◽  
Author(s):  
Xiaomin Chai ◽  
Hai-Hua Huang ◽  
Huiping Liu ◽  
Zhuofeng Ke ◽  
Wen-Wen Yong ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Photocatalytic Performance ◽  
Aqueous Media ◽  
Highly Efficient ◽  
Co Conversion

A Co-based complex displayed the highest photocatalytic performance for CO2 to CO conversion in aqueous media.

Efficient trace-scale extraction method of reactor produced 199Au adequate for nuclear medicine applications

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Mohamed F. Attallah ◽  
Ahmed M. Shahr El-Din ◽  
Mohamed A. Gizawy ◽  
Amal M. I. Ali
Keyword(s):  
Aqueous Media ◽  
Selective Extraction ◽  
Extraction Process ◽  
High Yield ◽  
High Recovery ◽  
Rapid Separation ◽  
Efficient Separation ◽  
Liquid Liquid Extraction ◽  
Cyanex 302 ◽  
Cyanex 923

Abstract Production of no carrier-added (NCA) 199Au through natPt(n, γ) reaction and subsequent purification using liquid-liquid extraction from other radioisotopes is studied in the context of theranostic application. Comparative separation of NCA 199Au after dissolution of activated Pt target using three Cyanex compounds (Cyanex-272, Cyanex-302 and Cyanex-923) is evaluated. The extraction process is optimized in terms of the type of extractant, the concentration of extractant, extraction time and aqueous media (HNO3, NH4OH). Among these extractants, the Cynaex-923 is efficient and promising for rapid separation and production of NCA 199Au from HNO3 by high extraction %. Selective extraction of 199Au from other Pt and Ir radioisotopes is observed. High recovery of 199Au was obtained in the case of Cyanex-923 using 0.05 M thiourea dissolved in HCl or 2 M NaOH. Our results find the Cyanex-923 as a promising extractant for efficient separation of 199Au from irradiated Pt target with high yield (99%).

scholarly journals Double-Cross-Linked Networks Based on Methacryloyl Mucin

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1706
Author(s):  
Elena Olăreț ◽  
Brîndușa Bălănucă ◽  
Andra Mihaela Onaș ◽  
Jana Ghițman ◽  
Horia Iovu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Aqueous Solution ◽  
Chemical Modification ◽  
Structural Modification ◽  
Aqueous Media ◽  
Cross Linking ◽  
Ph Values ◽  
Acid Aqueous Solution ◽  
Reaction Media ◽  
Double Cross

Mucin is a glycoprotein with proven potential in the biomaterials field, but its use is still underexploited for such applications. The present work aims to produce a synthesis of methacryloyl mucin single-network (SN) hydrogels and their double-cross-linked-network (DCN) counterparts. Following the synthesis of the mucin methacryloyl derivative, various SN hydrogels are prepared through the photopolymerization of methacrylate bonds, using reaction media with different pH values. The SN hydrogels are converted into DCN systems via supplementary cross-linking in tannic acid aqueous solution. The chemical modification of mucin is described, and the obtained product is characterized; the structural modification of mucin is assessed through FTIR spectroscopy, and the circular dichroism and the isoelectric point of methacryloyl mucin is evaluated. The affinity for aqueous media of both SN and DCN hydrogels is estimated, and the mechanical properties of the systems are assessed, both at macroscale through uniaxial compression and rheology tests and also at microscale through nanoindentation tests.

scholarly journals The Equilibrium, Kinetics, and Thermodynamics Studies of the Sorption of Methylene Blue from Aqueous Solution Using Pulverized Raw Macadamia Nut Shells

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Joshua N. Edokpayi ◽  
Samson O. Alayande ◽  
Ahmed Adetoro ◽  
John O. Odiyo
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Surface Area ◽  
Low Cost ◽  
Aqueous Media ◽  
Group Analysis ◽  
Second Order ◽  
Isotherm Models ◽  
Macadamia Nut ◽  
Pseudo Second Order

In this study, the potential for pulverized raw macadamia nut shell (MNS) for the sequestration of methylene blue from aqueous media was assessed. The sorbent was characterized using scanning electron microscopy for surface morphology, functional group analysis was performed with a Fourier-transform infrared spectrometer (FT-IR), and Brunauer–Emmett–Teller (BET) isotherm was used for surface area elucidation. The effects of contact time, sorbent dosage, particle size, pH, and change in a solution matrix were studied. Equilibrium data were fitted using Temkin, Langmuir, and Freundlich adsorption isotherm models. The sorption kinetics was studied using the Lagergren pseudo-first-order, pseudo-second-order, Elovich, and intraparticle diffusion models. The feasibility of the study was established from the thermodynamic studies. A surface area of 2.763 m2/g was obtained. The equilibrium and kinetics of sorption was best described by the Langmuir and the pseudo-second-order models, respectively. The sorption process was spontaneous (−ΔG0=28.72−31.77 kJ/mol) and endothermic in nature (ΔH0=17.45 kJ/mol). The positive value of ΔS0 (0.15 kJ/molK) implies increased randomness of the sorbate molecules at the surface of the sorbent. This study presents sustainable management of wastewater using MNS as a potential low-cost sorbent for dye decontamination from aqueous solution.

A reversible fluorescent-colorimetric chemosensor based on a novel Schiff base for visual detection of CO32− in aqueous solution

RSC Advances ◽  
2016 ◽  
Vol 6 (76) ◽  
pp. 72185-72192 ◽  
Author(s):  
Anupam Ghorai ◽  
Jahangir Mondal ◽  
Rukmani Chandra ◽  
Goutam K. Patra
Keyword(s):  
Aqueous Solution ◽  
Schiff Base ◽  
Visual Detection ◽  
Colorimetric Detection ◽  
Aqueous Media ◽  
Rapid Response ◽  
Colorimetric Chemosensor ◽  
Excellent Selectivity

A novel Schiff base receptor L has been fabricated for fluorescent-colorimetric detection of CO32− in aqueous media. L shows an excellent selectivity, rapid response and reversibility and its sensitivity for CO32− is the lowest ever found (96 nM).

A Co(ii) complex of a vitamer of vitamin B6acts as a sensor for Hg2+and pH in aqueous media

2016 ◽  
Vol 40 (7) ◽  
pp. 6396-6404 ◽  
Author(s):  
Nilam Sing ◽  
Sanjay Roy ◽  
Partha Sarathi Guin ◽  
Kalachand Mahali ◽  
Prakash Majee ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Fluorescent Sensor ◽  
Aqueous Media ◽  
Template Reaction

A new Co(ii) complex was prepared by template reaction, acting as a dual fluorescent sensor for Hg2+ions and pH in aqueous solution.

Properties of low power spark ablation in aqueous solution for dissolution of precious metals and alloys

2006 ◽  
Vol 61 (7) ◽  
pp. 817-823 ◽  
Author(s):  
Douglas Goltz ◽  
Michael Boileau ◽  
Ian Plews ◽  
Kimberly Charleton ◽  
Michael W. Hinds
Keyword(s):  
Aqueous Solution ◽  
Low Power ◽  
Precious Metals ◽  
Metals And Alloys

Exploration of interactions between decyl-β-d-glucopyranoside and bovine serum albumin in aqueous solution

RSC Advances ◽  
2016 ◽  
Vol 6 (24) ◽  
pp. 19700-19706 ◽  
Author(s):  
Gongke Wang ◽  
Huimin Hou ◽  
Ye Chen ◽  
Changling Yan ◽  
Guangyue Bai ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Surface Tension ◽  
Steady State ◽  
Bovine Serum Albumin ◽  
Serum Albumin ◽  
Absorption Spectroscopy ◽  
Bovine Serum ◽  
Aqueous Media ◽  
Steady State Fluorescence

The interactions between decyl-β-d-glucopyranoside (DG) and bovine serum albumin (BSA), in aqueous media, were investigated through the use of surface tension, steady-state fluorescence, and UV-vis absorption spectroscopy measurements.

Dispersion Polymerization of Acrylamide and Acrylic Acid in Aqueous Media

2009 ◽  
Vol 87-88 ◽  
pp. 233-238
Author(s):  
Jiao Lu ◽  
Bo Peng ◽  
Ming Yuan Li ◽  
Mei Qin Lin
Keyword(s):  
Aqueous Solution ◽  
Molecular Weight ◽  
Acrylic Acid ◽  
Intrinsic Viscosity ◽  
Salt Concentration ◽  
Apparent Viscosity ◽  
Dispersion Polymerization ◽  
Aqueous Media ◽  
Salt Solutions ◽  
Aqueous Salt Solutions

Dispersion polymerization of acrylamide and acrylic acid was successfully carried out in aqueous salt solutions using anionic polyelectrolytes as stabilizers. The influences of aqueous solution of salt concentration, molecular weight and concentration of the stabilizers on the apparent viscosity and stability of the dispersions, and on the molecular weight of the polymers prepared were investigated. The results showed that stable dispersions could be obtained on condition that salt concentration was between 26%~30%, concentration of stabilizers between 8%~12%, and intrinsic viscosity of stabilizers between 2.977~3.740 dL/g. With salt concentration ranging from 26% to 30%, molecular weight of products increased first and then decreased. Molecular weight of products was hardly changed when concentration of stabilizer was between 8%~12%. When intrinsic viscosity of stabilizer was between 2.977~3.740 dL/g, increase of the molecular weight of stabilizer resulted in a decrease in the molecular weight of the products.

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