The adsorptive properties of UiO-66 towards organic dyes: A record adsorption capacity for the anionic dye Alizarin Red S.

2018 ◽  
Vol 26 (4) ◽  
pp. 731-739 ◽  
Author(s):  
Marwa S. Embaby ◽  
Saber D. Elwany ◽  
Widiastuti Setyaningsih ◽  
Mohamed R. Saber
Keyword(s):  
Adsorption Capacity ◽  
Organic Dyes ◽  
Alizarin Red S ◽  
Alizarin Red ◽  
Anionic Dye ◽  
Adsorptive Properties

scholarly journals GO/PAMAM as a High Capacity Adsorbent for Removal of Alizarin Red S: Selective Separation of Dyes

2020 ◽  
Vol 67 (4) ◽  
pp. 1124-1138
Author(s):  
Mohammad Rafi ◽  
Babak Samiey ◽  
Chil-Hung Chen
Keyword(s):  
Adsorption Capacity ◽  
High Capacity ◽  
Pamam Dendrimer ◽  
Alizarin Red S ◽  
Alkaline Media ◽  
Maximum Adsorption Capacity ◽  
Alizarin Red ◽  
Adsorption Sites ◽  
Diffusion Controlled ◽  
Amine Groups

Adsorption of Alizarin Red S (ARS) on graphene oxide/poly(amidoamine) (GO/PAMAM) was studied at different ARS initial concentrations, temperatures, pHs, shaking rates and contact times. Adsorption sites of GO/PAMAM were phenolic –OH (Ph) group of GO and amine groups (–NH2, –NH+ 3 and –NHR+2) of PAMAM dendrimer moieties of GO/PAMAM. At pH = 2 and 318 K, maximum adsorption capacity (qe,max) of the adsorbent was 1275.2 mg g–1 which is one of the highest capacity in the literature. Thus, GO/PAMAM in this work acted as a superadsorbent for ARS. At the incipient of adsorption, ARS– molecules were adsorbed on Ph sites that was reaction-controlled step, (Ea = 114.5 kJ mol–1). Adsorption of ARS–on the remaining sites was diffusion–controlled. In alkaline media, two other types of ARS molecules were identified during that were adsorbed on Ph and –NH+ 3 sites. Further increasing the pH of the solution, decreased the number these two sites and yielded a reduced adsorption capacity (qe,max). Methylene blue (MB), thionine (Th), pyronin Y (PY), acridine orange (AO), methyl blue (MEB) and janus green (JG) dyes were selectively separated from their mixtures with ARS molecules using GO/PAMAM at pH of 2. The used adsorbent was recycled fficiently by using ethylenediamine very fast.

A quantitative appraisal of the binding interactions between an anionic dye, Alizarin Red S, and alkyloxypyridinium surfactants: a detailed micellization, spectroscopic and electrochemical study

Soft Matter ◽  
2016 ◽  
Vol 12 (6) ◽  
pp. 1736-1749 ◽  
Author(s):  
Renu Sharma ◽  
Ajar Kamal ◽  
Rakesh Kumar Mahajan
Keyword(s):  
Aqueous Solution ◽  
Alizarin Red S ◽  
Electrochemical Study ◽  
Alizarin Red ◽  
Anionic Dye ◽  
Redox Active ◽  
Comprehensive Knowledge ◽  
Oppositely Charged ◽  
Mixed Systems ◽  
Quantitative Appraisal

The interactions of an anionic redox-active dye Alizarin Red S (ARS) with novel N-hydroxyethyl-3-alkyloxypyridinium surfactants [HEC14OPyBr], and [HEC16OPyBr], were investigated in an aqueous solution to obtain comprehensive knowledge of oppositely charged dye–surfactant mixed systems.

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 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.

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