scholarly journals Highly Selective Purification of Grewia asiatica Anthocyanin Based on Macroporous Resins

2021 ◽  
Vol 22 (1) ◽  
pp. 44-52
Author(s):  
Marvi Kanwal Talpur
Keyword(s):  
Flow Rate ◽  
Langmuir Isotherm ◽  
Packed Column ◽  
Dynamic Adsorption ◽  
Separation Procedure ◽  
Order Model ◽  
Operational Procedure ◽  
Peak Intensity ◽  
Macroporous Resins ◽  
Adsorption Desorption

In the present study, enactments and separation characteristics of five extensively utilized adsorbents for enhancement and purification of Grewia asiatica Anthocyanins (ACNs) extracts were analysed. Among five tested resins (AB-8, Sepabeads Sp-700, C18SPE Cartridge, Sepabeads Sp-207 and AB-80), AB-8 resin exhibited the best adsorbent ability for Grewia asiatica ACNs (84.24mg/mL resin). Results of static adsorption tests revealed that AB-8 resin selected for kinetics and isotherm experiments followed a pseudo 2nd order model along with Langmuir isotherm. In order to improve operational procedure, dynamic adsorption and desorption tests were done on a packed column of AB-8 resin. Optimum factors for subsequent adsorption-desorption experiments; processing volume 20ml, flow rate 2 mL/min with elution solvent of acidified methanol (1%v/v) were used. HPLC and LC-MS/MS profiles of the purified extract confirmed seven ACNs in Grewia asiatica samples, out of which cyanidin-3-O-(6"acetylglucoside) comprises 44-63% (695 μg/g) of total ACNs composition. Moreover, pigment purification using AB-8 resin did not alter ACNs mixture composition after purification but enhance the peak intensity and gives effective purification. Hence present work reveals that the separation procedure established through column chromatography providing an effective methodology to enhance the purification of ACNs from Grewia asiatica.

Research on the Contaminants Adsorption and Removal by Macroporous Resins in the Textile and Dyeing

2020 ◽  
Vol 852 ◽  
pp. 32-40
Author(s):  
Shuang Han ◽  
Meng Li ◽  
Qian Zhang ◽  
Min Zhong ◽  
Fang Lu
Keyword(s):  
Flow Rate ◽  
Ph Value ◽  
Removal Rate ◽  
Packed Column ◽  
Environmental Water ◽  
Dyeing Wastewater ◽  
Adsorption And Desorption ◽  
Initial Concentration ◽  
Macroporous Resins ◽  
Desorption Capacity

Textile and dyeing wastewater is the major source of environmental water pollution all over the world, which has complex composition so that conventional methods are difficult to remove and degrade. Based on the relevant research, this paper proposes to add further treatment by using macroporous resins on the basic of the conventional treatment and explore the effects of the adsorption and desorption, such as the pH value, initial concentration of , temperature and the flow rate. The performance of six kinds of macroporous resins (DA-2, D280, DA201, D3520, AB-8 and DA-201) for the advanced treatment in the textile and dyeing wastewater has been evaluated. The adsorption and desorption properties of the contaminants, which tested by the six kinds of the macroporous resins in the textile and dyeing, have been compared. According to the results, D3520 resin holds the highest adsorption and desorption capacity. (15.6mg/g for adsorption capacity, 15.1mg/g for desorption capacity). The effects of the pH value, initial concentration of , temperature and the flow rate on removal of by D3520 macroporous resin have been tested. The results showed that the removal of increased with the pH value and initial concentration of COD increasing and the data of its adsorption fitted the Langmuir isotherm best. Besides, 92.49% could be removed after 8h of adsorption at 25 °C. Dynamic adsorption and desorption experiments have been carried out on the packed column of D3520 resins as a reference for engineering applications, the results showed that the D3520 resin could still reach 79.5% removal rate after adsorptions-regeneration for five times.

Application of raw and modified Uruguayan clays to phosphate adsorption for water remediation

MRS Advances ◽  
2018 ◽  
Vol 3 (61) ◽  
pp. 3543-3549
Author(s):  
Pablo González ◽  
Andrea C. De Los Santos ◽  
Jorge R. Castiglioni ◽  
María A. De León
Keyword(s):  
Nitrogen Adsorption ◽  
Pillared Clay ◽  
Water Remediation ◽  
Phosphate Adsorption ◽  
X Ray Diffraction ◽  
Order Model ◽  
Freundlich Model ◽  
X Ray ◽  
First Order ◽  
Adsorption Desorption

ABSTRACTA raw clay from Uruguay was modified with aluminium to obtain an aluminium pillared clay (Al-PILC). The solids were characterized by scanning electron microscopy, X-ray diffraction and nitrogen adsorption-desorption isotherms. The Al-PILC retained the typical laminar structure of montmorillonite. The specific surface area and the microporous volume of the Al-PILC, 235 m2 g-1 and 0.096 cm3 g-1, respectively, were much higher than those of the clay. The phosphate adsorption capacity of the Al-PILC was higher than those of the clay. The phosphate adsorption kinetic followed the pseudo-first-order model for both, the clay and the Al-PILC, and the phosphate adsorption isotherm for the Al-PILC fit the Freundlich model.

Modeling of the Adsorption/Desorption Characteristics and Properties of Anthocyanins from Extruded Red Cabbage Juice by Macroporous Adsorbent Resin

2019 ◽  
Vol 15 (1-2) ◽  
Author(s):  
Pingjing Zhang ◽  
Liping Wang ◽  
Sheng Fang
Keyword(s):  
Adsorption Process ◽  
Fixed Bed ◽  
Order Kinetic ◽  
Adsorption And Desorption ◽  
Red Cabbage ◽  
Macroporous Resins ◽  
Freeze Dried ◽  
Order Kinetic Model ◽  
Color Density ◽  
Adsorption Desorption

AbstractThe adsorption/desorption characteristics, modeling and properties of anthocyanins from extruded red cabbage juice by macroporous resins were investigated. The static adsorption and desorption capacities of red cabbage anthocyanins on five macroporous resins were measured and compared. The X-5 resin showed the best capacities and was selected for the adsorption kinetics, isotherms and elution studies. The pseudo-second-order kinetic model and Langmuir isotherm model were used to describe the adsorption process and mechanism. Dynamic adsorption and desorption tests were performed on a fixed-bed column, and the loading and eluent conditions were optimized. The purity of anthocyanins in freeze-dried purified powder by the resin adsorption process is 21.3 ± 0.9 wt % and shows better stability in the air than the unpurified one. Finally, the antioxidant activity and color properties including color density, color intensity, color tonality and degradation index of the purified powders were measured.

scholarly journals Recovery of phosphate from aqueous solution by magnetically recycled modified polishing powder composites

2019 ◽  
Vol 80 (7) ◽  
pp. 1357-1366
Author(s):  
Jianming Liu ◽  
Runying Bai ◽  
Junfeng Hao ◽  
Bowen Song ◽  
Yu Zhang ◽  
...  
Keyword(s):  
Adsorption Capacity ◽  
Ligand Exchange ◽  
Adsorption Process ◽  
High Adsorption ◽  
Order Model ◽  
Powder Composites ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order ◽  
Ph Level ◽  
Adsorption Desorption

Abstract This study investigated a magnetically recycled modified polishing powder (CMIO@PP) as an adsorbent of phosphate; the CMIO@PP was synthesized by combining the modified La/Ce-containing waste polishing powder with CaO2-modified Fe3O4 (CMIO). Results indicate that the CMIO@PP nanocomposite presents a crystal structure comprising La (OH)3, Ce (OH)3, and Fe3O4, and that CMIO is uniformly dispersed in the modified polishing powder. The CMIO@PP (1:3) is a suitable choice considering its magnetism and adsorption capacity. The magnetic adsorbent exhibits a high adsorption capacity of 53.72 mg/g, a short equilibrium time of 60 min, and superior selectivity for phosphate. Moreover, the adsorbent strongly depends on the pH during the adsorption process and maintains a large adsorption capacity when the pH level is between 2 and 6. The adsorption of phosphate by the CMIO@PP (1:3) accords with the Langmuir isotherm model, and the adsorption process follows the pseudo-second order model. Meanwhile, adsorption–desorption experiments show that the adsorbent could be recycled a few times and that a high removal efficiency of phosphate from civil wastewater was achieved. Finally, mechanisms show that the adsorption of phosphate by the CMIO@PP (1:3) is mainly caused by electrostatic attraction and ligand exchange.

Study of the Dynamics of the Adsorption of Trichloroethylene (TCE) on Active Carbons

2019 ◽  
Vol 23 (9) ◽  
pp. 30-35
Author(s):  
A.K. Gorelkina ◽  
T.A. Krasnova ◽  
I.V. Tymoshchuk ◽  
N.V. Gora ◽  
N.S. Golubeva
Keyword(s):  
Mass Transfer ◽  
Functional Groups ◽  
Flow Rate ◽  
Operating Time ◽  
Carbon Surface ◽  
Dynamic Adsorption ◽  
Constant Flow ◽  
Active Carbons ◽  
Coal Surface ◽  
Constant Flow Rate

The dynamics of adsorption of trichloroethylene from aqueous solutions on active carbons (AC) of the SKD-515, ABG, Purolat-Standart grades, differing in composition, method of preparation, structure and chemical state of the surface, was studied. The operating time of the filtering layer before breakthrough decreases in the series SKD-515> ABG> Purolat-Standart coal, which is caused by the porous structure of the coal and the nature of the oxygen-containing functional groups on the carbon surface. It was also noted that adsorption is influenced by the interaction of TCE with functional groups of the coal surface. The efficiency of TCE adsorption on various active carbons at a constant flow rate was studied. It was shown that a decrease in the flow rate of the solution through the filter increases the dynamic adsorption capacity, which indisputably confirms the pore-diffusion inhibition of mass transfer.

A Multiphysics Reduced Order Model of Valve Pumping in a 4-Stage Vacuum Micropump

2012 ◽  
Author(s):  
Karthik Kumar ◽  
Ali Besharatian ◽  
Luis P. Bernal ◽  
Rebecca L. Peterson ◽  
Khalil Najafi
Keyword(s):  
Flow Rate ◽  
Gas Analysis ◽  
Reduced Order Model ◽  
Order Model ◽  
Rate Condition ◽  
Reduced Order ◽  
Multiple Electrodes ◽  
Peristaltic Pumps ◽  
Viscous Losses ◽  
Flow Through

Micro pumps are required in gas chromatographs and other gas analysis systems. Thermodynamic and reduced order models reported in the literature consider only the deflection of pumping membranes which is insufficient to study the performance characteristics of more complicated multistage peristaltic pumps with multiple coupled chambers, active checkerboard valves and single or multiple electrodes for actuating the pumping membranes and valves. Specifically the volume displaced by the valves membranes can be significant compared to the volume displaced by the pumping membranes. In this paper a multiphysics model is extended to include the effect of valves as well the pump membranes deflections. The viscous losses in the flow through the valves are modeled using CFD while the structural behavior of the membrane is modeled using COMSOL in quasi-steady analyses and the results incorporated into the multiphysics unsteady reduced-order model. The model is validated by comparing computed flow-rate as a function of frequency with experimental results for a 4-stage micropump which are found to be within 7%. At a high flow rate condition the model results show that for a 4-stage pump the deflection of the valves significantly affects the performance of the pump.

scholarly journals Simultaneous Purification and Separation of Syringoside and Oleuropein from Syringa oblata Lindl. Extract Using Macroporous Resin

2019 ◽  
Vol 2019 ◽  
pp. 1-10
Author(s):  
Guoliang Li ◽  
Hongxiu Yan ◽  
Xiangping Liu
Keyword(s):  
Optimal Parameters ◽  
Macroporous Resin ◽  
Adsorption Experiment ◽  
Adsorption Performance ◽  
Macroporous Resins ◽  
Initial Extract ◽  
Langmuir Isotherm Model ◽  
Potential Basis ◽  
Adsorption Desorption ◽  
Separation Parameters

This study developed an efficient method to simultaneously separate and purify syringoside and oleuropein from Syringa oblata Lindl. extract using macroporous resins. The adsorption and desorption property of 11 resins were systematically evaluated. Based on the adsorption performance, HPD-100B resin was selected for the separation of syringoside and oleuropein. The HPD-100B resin fitted well to the Langmuir isotherm model (R2 > 0.97), as ascertained by the results of the static adsorption experiment. Kinetic and dynamic adsorption/desorption experiments were conducted using the HPD-100B resin to optimize the separation parameters of syringoside and oleuropein. On the optimal parameters, syringoside and oleuropein were obtained from the 20% and 40% ethanol eluates, respectively. In addition, the adsorption effluent (15–60 BV) contained a large amount of syringoside with less impurities; therefore, this part was also collected for further syringoside separation and enrichment of syringoside. By only one cycle treatment, the syringoside and oleuropein contents in the final products increased by 7.1-fold and 8.2-fold, respectively, compared to the initial extract. The method developed in this study provides a potential basis for the industrial-scale enrichment and separation of syringoside and oleuropein from S. oblata extract.

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