scholarly journals Layer-by-Layer Assembly and Electrochemical Study of Alizarin Red S-Based Thin Films

Polymers ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 165 ◽  
Author(s):  
Wei Ma ◽  
Yanpu Zhang ◽  
Fei Li ◽  
Donghui Kou ◽  
Jodie Lutkenhaus
Keyword(s):  
Electrochemical Properties ◽  
Color Change ◽  
Organic Dyes ◽  
Co Adsorption ◽  
Growth Patterns ◽  
Alizarin Red S ◽  
Layer By Layer ◽  
Ethylene Imine ◽  
Alizarin Red ◽  
Anthraquinone Dye

Electroactive organic dyes incorporated in layer-by-layer (LbL) assemblies are of great interest for a variety of applications. In this paper, Alizarin Red S (ARS), an electroactive anthraquinone dye, is employed to construct LbL (BPEI/ARS)n films with branched poly(ethylene imine) (BPEI) as the complementary polymer. Unconventional LbL methods, including co-adsorption of ARS and poly(4-styrene sulfonate) (PSS) with BPEI to assemble (BPEI/(ARS+PSS))n, as well as pre-complexation of ARS with BPEI and further assembly with PSS to fabricate ((BPEI+ARS)/PSS)n, are designed for investigation and comparison. Film growth patterns, UV–Vis spectra and surface morphology of the three types of LbL assemblies are measured and compared to reveal the formation mechanism of the LbL films. Electrochemical properties including cyclic voltammetry and spectroelectrochemistry of (BPEI/ARS)120, (BPEI/(ARS+PSS))120 and ((BPEI+ARS)/PSS)120 films are studied, and the results show a slight color change due to the redox reaction of ARS. ((BPEI+ARS)/PSS)120 shows the best stability among the three samples. It is concluded that the manner of dye- incorporation has a great effect on the electrochemical properties of the resultant films.

scholarly journals Electrocoagulation removal of anthraquinone dye Alizarin Red S from aqueous solution using aluminum electrodes: kinetics, isothermal and thermodynamics studies

2016 ◽  
Author(s):  
Abideen Idowu Adeogun ◽  
Ramesh Babu Balakrishnan
Keyword(s):  
Experimental Data ◽  
Aqueous Solution ◽  
Current Density ◽  
Alizarin Red S ◽  
Isotherm Models ◽  
Alizarin Red ◽  
Anthraquinone Dye ◽  
First Order ◽  
Electrocoagulation Process ◽  
Pseudo First Order

<span lang="EN-US">Electrocoagulation (EC) was used for the removal of anthraquinone dye, Alizarin Red S (ARS) from aqueous solution, the process was carried out in a batch electrochemical cell with Al electrodes in monopolar connection. The effects of some important parameters such as current density, pH, temperature and initial dye concentration, on the process were investigated. Equilibrium was attained after 10 minutes at 30 oC. Pseudo-first-order, pseudo-second-order, Elovic, and Avrami kinetic models were used to test the experimental data in order to elucidate the kinetic of the electrocoagulation process; pseudo-first-order and Avrami models best fitted the data. Experimental data were analyzed using six isotherm models: Langmuir, Freudlinch, Redlich–Peterson, Temkin, Dubinin–Radushkevich and Sips isotherms and it was found that the data fitted well with Dubinin–Radushkevich and Sips isotherm model. The study showed that the process depend on current density, temperature, pH and initial dye concentration. The calculated thermodynamics parameters (∆G<sup>o</sup>, ∆H<sup>o</sup> and ∆S<sup>o</sup>) indicated that the process is spontaneous and endothermic in nature.</span>

scholarly journals Alizarin Red S-Confined Layer-By-Layer Films as Redox-Active Coatings on Electrodes for the Voltammetric Determination of L-Dopa

Materials ◽  
2017 ◽  
Vol 10 (6) ◽  
pp. 581 ◽  
Author(s):  
Shigehiro Takahashi ◽  
Iwao Suzuki ◽  
Tatsuro Sugawara ◽  
Masaru Seno ◽  
Daichi Minaki ◽  
...  
Keyword(s):  
Voltammetric Determination ◽  
Alizarin Red S ◽  
Layer By Layer ◽  
Alizarin Red ◽  
Redox Active

scholarly journals Sustainable Development of Magnetic Chitosan Core–Shell Network for the Removal of Organic Dyes from Aqueous Solutions

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7701
Author(s):  
Karthik Rathinam ◽  
Xinwei Kou ◽  
Ralph Hobby ◽  
Stefan Panglisch
Keyword(s):  
Electrostatic Interactions ◽  
Dye Removal ◽  
Adsorption Process ◽  
Organic Dyes ◽  
Core Shell ◽  
Order Kinetic ◽  
Alizarin Red ◽  
Anthraquinone Dye ◽  
Magnetic Chitosan ◽  
Repulsive Forces

The wide use of alizarin red S (ARS), a typical anthraquinone dye, has led to its continued accumulation in the aquatic environment, which causes mutagenic and carcinogenic effects on organisms. Therefore, this study focused on the removal of ARS dye by adsorption onto a magnetic chitosan core–shell network (MCN). The successful synthesis of the MCN was confirmed by ATR-FTIR, SEM, and EDX analysis. The influence of several parameters on the removal of ARS dye by the MCN revealed that the adsorption process reached equilibrium after 60 min, pH played a major role, and electrostatic interactions dominated for the ARS dye removal under acidic conditions. The adsorption data were described well by the Langmuir isotherm and a pseudo-second order kinetic model. In addition to the preferable adsorption of hydrophobic dissolved organic matter (DOM) fractions onto the MCN, the electrostatic repulsive forces between the previously adsorbed DOM onto MCN and ARS dye resulted in lower ARS dye removal. Furthermore, the MCN could easily be regenerated and reused for up to at least five cycles with more than 70% of its original efficiency. Most importantly, the spent MCN was pyrolytically converted into N-doped magnetic carbon and used as an adsorbent for various dyes, thus establishing a waste-free adsorption process.

Anodic oxidation of anthraquinone dye Alizarin Red S at Ti/BDD electrodes

2011 ◽  
Vol 257 (15) ◽  
pp. 6667-6671 ◽  
Author(s):  
Jianrui Sun ◽  
Haiyan Lu ◽  
Lili Du ◽  
Haibo Lin ◽  
Hongdong Li
Keyword(s):  
Anodic Oxidation ◽  
Alizarin Red S ◽  
Alizarin Red ◽  
Anthraquinone Dye

scholarly journals Adsorption of Malachite Green and Alizarin Red S Dyes Using Fe-BTC Metal Organic Framework as Adsorbent

2021 ◽  
Vol 22 (2) ◽  
pp. 788
Author(s):  
Giulia Rossella Delpiano ◽  
Davide Tocco ◽  
Luca Medda ◽  
Edmond Magner ◽  
Andrea Salis
Keyword(s):  
Malachite Green ◽  
Organic Dyes ◽  
Metal Organic Framework ◽  
Alizarin Red S ◽  
Alizarin Red ◽  
Industrial Sectors ◽  
Vis Spectroscopy ◽  
Wide Range ◽  
Metal Organic ◽  
Pseudo Second Order

Synthetic organic dyes are widely used in various industrial sectors but are also among the most harmful water pollutants. In the last decade, significant efforts have been made to develop improved materials for the removal of dyes from water, in particular, on nanostructured adsorbent materials. Metal organic frameworks (MOFs) are an attractive class of hybrid nanostructured materials with an extremely wide range of applications including adsorption. In the present work, an iron-based Fe-BTC MOF, prepared according to a rapid, aqueous-based procedure, was used as an adsorbent for the removal of alizarin red S (ARS) and malachite green (MG) dyes from water. The synthesized material was characterized in detail, while the adsorption of the dyes was monitored by UV-Vis spectroscopy. An optimal adsorption pH of 4, likely due to the establishment of favorable interactions between dyes and Fe-BTC, was found. At this pH and at a temperature of 298 K, adsorption equilibrium was reached in less than 30 min following a pseudo-second order kinetics, with k″ of 4.29 × 10−3 and 3.98 × 10−2 g∙mg−1 min−1 for ARS and MG, respectively. The adsorption isotherm followed the Langmuir model with maximal adsorption capacities of 80 mg∙g−1 (ARS) and 177 mg∙g−1 (MG), and KL of 9.30·103 L∙mg−1 (ARS) and 51.56·103 L∙mg−1 (MG).

scholarly journals Globular adiponectin inhibits osteoblastic differentiation of vascular smooth muscle cells through the PI3K/AKT and Wnt/β-catenin pathway

2021 ◽  
Author(s):  
Yun Zhou ◽  
Li-Long Wei ◽  
Rui-Ping Zhang ◽  
Cheng-Wu Han ◽  
Yongtong Cao
Keyword(s):  
Smooth Muscle ◽  
Vascular Smooth Muscle ◽  
Smooth Muscle Cells ◽  
Vascular Smooth Muscle Cells ◽  
Muscle Cells ◽  
Osteoblastic Differentiation ◽  
Alizarin Red S ◽  
Regulation Mechanism ◽  
Alizarin Red ◽  
Globular Adiponectin

AbstractLipid metabolism is closely related to the improvement of vascular calcification (VC) in chronic kidney disease (CKD). Globular adiponectin (gAd) has been reported to be involved in the development of VC in CKD, but the detailed regulatory role remains unclear. The present study is aimed to investigate the biological function and the underlying regulation mechanism of gAd in the process of VC during CKD. Vascular smooth muscle cells (VSMCs) calcification was determined by Alizarin Red S staining. Protein signaling related with VC was tested by western blotting. The expression and intracellular localization of runt-related transcription factor 2 (Runx2) was detected by immunofluorescence and uraemic rat with VC was established by a two-step nephrectomy. Combined with the results of Alizarin Red S staining, we discovered that β-glycerophosphate (β-Gp)-induced the osteoblastic differentiation of VSMCs was significantly reversed by gAd treatment. Along with the VSMCs calcification and the increase of Runx2 in β-Gp-exposed VSMCs, the activities of protein kinase B (AKT) and Wnt/β-catenin pathway were enhanced, but that were counteracted by the exposure of gAd in rat and human VSMCs. After administration with agonists of the Wnt (SKL2001) and AKT (SC79), there appeared more osteoblastic differentiation and higher expression of Runx2 in gAd-treated VSMCs, but showing lower impact in the presence of SC79 than that in the presence of SKL2001. In the in vivo experiments, intravenous injection of gAd also significantly inhibited VC and Runx2 level in uraemic rat in a dose-dependent manner, possibly through regulating Wnt/β-catenin pathway. This study demonstrates that gAd ameliorates osteoblastic differentiation of VSMCs possibly by blocking PI3K/AKT and Wnt/β-catenin signaling transduction. The findings provide an important foundation for gAd in treating VC in kidney diseases.

Sustainable synthesis of AFe2O4 (A= Mg, Zn, Mn) catalysts: comparing the photooxidative and electrochemical properties towards organic dyes detection and degradation

2021 ◽  
Author(s):  
Jeena N. Baby ◽  
Lavanya Chandrasekar ◽  
Sea-Fue Wang ◽  
Sriram Balasubramanian ◽  
Ashwini Anantharaman ◽  
...  
Keyword(s):  
Electrochemical Properties ◽  
Organic Dyes ◽  
Energy Requirements ◽  
Green Solvents ◽  
Reaction Media

By serving as alternatives to toxic and hazardous solvents, green solvents assist in implementing the idea of sustainability. The use of these neoeric reaction media dramatically reduces energy requirements and...

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