Ecofriendly dyeing of silk with extract of yerba mate (Ilex paraguariensis)

2016 ◽  
Vol 87 (7) ◽  
pp. 829-837 ◽  
Author(s):  
Fernando Giacomini ◽  
Maira Amanda Benedet Menegazzo ◽  
José Celso Oliveira dos Santos ◽  
Pedro Augusto Arroyo ◽  
Maria Angélica Simões Dornellas de Barros
Keyword(s):  
Significant Contribution ◽  
Dye Adsorption ◽  
Order Equation ◽  
Ilex Paraguariensis ◽  
Yerba Mate ◽  
Potassium Alum ◽  
Freundlich Model ◽  
Equilibrium Data ◽  
Pseudo Second Order ◽  
Rate Controlling Step

Silk fabric was dyed with extract of roasted yerba mate ( Ilex paraguariensis). Dyeing experiments were carried out at varying dyestuff concentration, temperature and pH. The influence of mordants, such as potassium alum and tannin, was investigated. The best results in dyeing were produced with 20 g L–1 of dyestuff concentration, pH 3 and temperature of 90℃. Mordants showed negligible influence. The kinetic study showed that the pseudo-second-order equation better represented experimental data, which is related to the chemisorption process as the rate-controlling step. The equilibrium data were easily adjusted by the Langmuir–Freundlich model, indicating the significant contribution of the chemisorption process in a monolayer followed by a multilayer physisorption. The thermodynamic study indicated that dye adsorption was spontaneous and endothermic.

scholarly journals Study on the adsorption of methylene blue from aqueous solution using hydrogel glucomannan/graphene oxide

2021 ◽  
Vol 10 (1) ◽  
pp. 59-66
Author(s):  
Son Le Lam ◽  
Phu Nguyen Vinh ◽  
Hieu Le Trung ◽  
Tan Le Thua ◽  
Nhan Dang Thi Thanh ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Graphene Oxide ◽  
Adsorption Capacity ◽  
Organic Dyes ◽  
Dye Adsorption ◽  
Order Kinetic ◽  
Equilibrium Data ◽  
Order Kinetic Model ◽  
Pseudo Second Order

Glucomannan/graphene oxide (GM/GO) hydrogel was synthesized by using calcium hydroxide as the crosslinker. The synthesized material was characterized by using IR, XRD, SEM, EDX and RAMAN technology. The composite hydrogel was used for removal of organic dyes from aqueous solution. The results showed that the GM/GO hydrogel had a porous structure and a high adsorption capacity toward methylene blue (MB). The pseudo-second-order kinetic model could fit the rate equation of MB adsorption onto the GM/GO hydrogel. The adsorption of MB onto GM/GO hydrogel was a spontaneous process. In addition, the equilibrium adsorption isotherm data indicated that equilibrium data were fitted to the Langmuir isotherm and the maximum dye adsorption capacity was 198,69 mg.g-1. Moreover, the hydrogel was stable and easily recovered and adsorption capacity was around 97% of the initial saturation adsorption capacity after being used five times.

Equilibrium and kinetic studies on biosorption of Pb(II) by common edible macrofungi: a comparative study

2016 ◽  
Vol 62 (4) ◽  
pp. 329-337 ◽  
Author(s):  
Yuan Jiang ◽  
Ruixia Hao ◽  
Shiqin Yang
Keyword(s):  
Kinetic Studies ◽  
Risk Level ◽  
Individual Species ◽  
Lead Removal ◽  
Freundlich Model ◽  
Hypsizygus Marmoreus ◽  
Agrocybe Cylindracea ◽  
Removal Capacity ◽  
Equilibrium Data ◽  
Pseudo Second Order

In this work, we studied the natural bioaccumulation and biosorption of Pb(II) in several common edible macrofungi. The macrofungi include the following species: Lentinus edodes, Pleurotus eryngii, Flammulina velutipes, Hypsizygus marmoreus, and Agrocybe cylindracea. The present analysis of Pb(II) revealed distinct capabilities of metal accumulation among individual species. Moreover, the natural concentrations of lead did not reach a health risk level when cultivated in uncontaminated soil. In the biosorption experiment by edible macrofungi, we found that the equilibrium data of living sporocarp (P. eryngii and H. marmoreus) and the homogenate of L. edodes and F. velutipes fit the Freundlich model well. Other data samples exhibited a better fit to the Langmuir model. The edible macrofungi showed a higher lead removal capacity than did other biosorbents. Furthermore, the pseudo-second-order kinetics model exhibited the best fit to the biosorption processes. The effectiveness of edible macrofungi as biosorbents for Pb(II) was confirmed.

scholarly journals Chitosan Grafted with Biobased 5-Hydroxymethyl-Furfural as Adsorbent for Copper and Cadmium Ions Removal

Polymers ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1173 ◽  
Author(s):  
Mariza Mone ◽  
Dimitra A. Lambropoulou ◽  
Dimitrios N. Bikiaris ◽  
George Kyzas
Keyword(s):  
Adsorption Capacity ◽  
Significant Loss ◽  
X Ray Diffraction ◽  
Freundlich Model ◽  
Hydroxymethyl Furfural ◽  
Before And After ◽  
Equilibrium Data ◽  
Best Fitting ◽  
Pseudo Second Order ◽  
Grafting From

This work investigates the application of 5-hydroxymethyl-furfural (HMF) as a grafting agent to chitosan (CS). The material produced was further modified by cross-linking. Three different derivatives were tested with molecular ratios CS/HMF of 1:1 (CS-HMF1), 2:1 (CS-HMF2) and 10:1 mol/mol (CS-HMF3)) to remove Cu2+ and Cd2+ from aqueous solutions. CS-HMF derivatives were characterized both before, and after, metal ions adsorption by using scanning electron microscopy (SEM), as well as Fourier-transform infrared (FTIR) spectroscopy thermogravimetric analysis (TGA), and X-Ray diffraction analysis (XRD). The CS-HMF derivatives were tested at pH = 5 and showed higher adsorption capacity with the increase of temperature. Also, the equilibrium data were fitted to Langmuir (best fitting) and Freundlich model, while the kinetic data to pseudo-first (best fitting) and pseudo-second order equations. The Langmuir model fitted better (higher R2) the equilibrium data than the Freundlich equation. By increasing the HMF grafting from 130% (CS-HMF1) to 310% (CS-HMF3), an increase of 24% (26 m/g) was observed for Cu2+ adsorption and 19% (20 mg/g) for Cd2+. By increasing from T = 25 to 65 °C, an increase of the adsorption capacity (metal uptake) was observed. Ten reuse cycles were successfully carried out without significant loss of adsorption ability. The reuse potential was higher of Cd2+, but more stable desorption reuse ability during all cycles for Cu2+.

Adsorption kinetics and isotherm of vanadium with melamine

2017 ◽  
Vol 75 (10) ◽  
pp. 2316-2321 ◽  
Author(s):  
Hao Peng ◽  
Zuohua Liu ◽  
Changyuan Tao
Keyword(s):  
Adsorption Kinetics ◽  
Impact Factors ◽  
Order Kinetic ◽  
Freundlich Model ◽  
Initial Ph ◽  
Equilibrium Data ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Adsorption Kinetics And Isotherm ◽  
Langmuir And Freundlich Models

Melamine, possessing three free amino groups and three aromatic nitrogen atoms in its molecule, has great potential as an adsorbent for metal ions. We investigated three impact factors of the adsorption process: the initial pH of the vanadium solution, contact time and reaction temperature. The adsorption kinetics could be accurately described by the pseudo-second-order kinetic model. Langmuir and Freundlich models fitted well with the experimental equilibrium data, and the maximal adsorption capacity was found to be 1,428.57 mg vanadium/g melamine, and the Freundlich model showed the adsorption is privilege type.

Adsorption kinetics and thermodynamics of acid Bordeaux B from aqueous solution by graphene oxide/PAMAMs

2015 ◽  
Vol 72 (7) ◽  
pp. 1217-1225 ◽  
Author(s):  
Fan Zhang ◽  
Shengfu He ◽  
Chen Zhang ◽  
Zhiyuan Peng
Keyword(s):  
Graphene Oxide ◽  
Adsorption Capacity ◽  
Ph Value ◽  
Maximum Adsorption Capacity ◽  
Freundlich Model ◽  
Equilibrium Data ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order ◽  
Effects Of Media ◽  
Better Than

Graphene oxide/polyamidoamines dendrimers (GO/PAMAMs) composites were synthesized via modifying GO with 2.0 G PAMAM. The adsorption behavior of the GO/PAMAMs for acid Bordeaux B (ABB) was studied and the effects of media pH, adsorption time and initial ABB concentration on adsorption capacity of the adsorbent were investigated. The optimum pH value of the adsorption of ABB onto GO/PAMAMs was 2.5. The maximum adsorption capacity increased from 325.78 to 520.83 mg/g with the increase in temperature from 298 to 328 K. The equilibrium data followed the Langmuir isotherm model better than the Freundlich model. The kinetic study illustrated that the adsorption of ABB onto GO/PAMAMs fit the pseudo-second-order model. The thermodynamic parameters indicated that the adsorption process was physisorption, and also an endothermic and spontaneous process.

scholarly journals Adsorption of Methylene blue and Rhodamine B by using biochar derived from Pongamia glabra seed cover

2017 ◽  
Vol 77 (3) ◽  
pp. 638-646 ◽  
Author(s):  
Neonjyoti Bordoloi ◽  
Manash Deep Dey ◽  
Rupak Mukhopadhyay ◽  
Rupam Kataki
Keyword(s):  
Methylene Blue ◽  
Rhodamine B ◽  
Dye Adsorption ◽  
Rate Equations ◽  
Synthetic Dyes ◽  
Sorption Data ◽  
Pongamia Glabra ◽  
Before And After ◽  
Equilibrium Data ◽  
Pseudo Second Order

Abstract Biochar obtained through the pyrolysis of Pongamia glabra seed cover (PGSC) at 550 °C with a heating rate of 40 °C/min was characterized and its ability to adsorb the dyes Methylene blue (MB) and Rhodamine B (RB) from aqueous solutions was investigated. The effect of pH, temperature and initial concentration of the dyes on adsorption behavior were investigated. The equilibrium sorption data were analyzed by using Langmuir, Freundlich, Temkin, and Dubinin–Radushkevich (D-R) isotherms. Equilibrium data were well fitted for D-R isotherm in case of MB and Langmuir isotherm in case of RB dyes. The kinetics of dye adsorption on PGSC biochar was well described by applying pseudo-second-order rate equations. The surface of adsorbent before and after the removal of dyes was characterized by using scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) analysis. The study suggested that PGSC biochar could be used as a highly efficient adsorbent for the removal of synthetic dyes.

Kinetic Study and Equilibrium Isotherm Analysis of Cationic Dye Adsorption onto Attapulgite and Rectorite

2012 ◽  
Vol 446-449 ◽  
pp. 2960-2963
Author(s):  
Jing Yan Song ◽  
Jing Yang
Keyword(s):  
Low Cost ◽  
Dye Adsorption ◽  
Second Order ◽  
Order Kinetic ◽  
Cationic Dye ◽  
Equilibrium Data ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Langmuir And Freundlich Equations

The adsorption properties of the attapulgite and the rectorite were investigated by removal of a cationic dye, methylene blue (MB) from aqueous solution. The attapulgite and the rectorite were characterized by Fourier transform infrared (FT-IR) spectroscopy, Brunauer-Emmett-Teller (BET) and scanning electron microscopy (SEM). The analysis of the isotherm equilibrium data using the Langmuir and Freundlich equations showed that the data fitted better with Langmuir model. Pseudo-first-order and pseudo-second-order models were considered to evaluate the rate parameters. The experimental data were well described by the pseudo-second-order kinetic model. The results indicate that the attapulgite exhibited higher adsorption capacity for MB than rectorite and could be employed as a low-cost alternative in wastewater treatment for the removal of cationic dyes.

scholarly journals Adsorptive Performance of Polypyrrole-Based KOH-Activated Carbon for the Cationic Dye Crystal Violet: Kinetic and Equilibrium Studies

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Abdulaziz Ali Alghamdi ◽  
Abdel-Basit Al-Odayni ◽  
Naaser A. Y. Abduh ◽  
Safiah A. Alramadhan ◽  
Mashael T. Aljboar ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Crystal Violet ◽  
Adsorption Process ◽  
Industrial Effluent ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Equilibrium Studies ◽  
Equilibrium Data ◽  
Pseudo Second Order ◽  
Rate Controlling Step

The aim of this work was to investigate the adsorptive performance of the polypyrrole-based KOH-activated carbon (PACK) in the removal of the basic dye crystal violet (CV) using a batch adsorption system. The equilibrium data, obtained at different initial CV concentrations ( C 0 = 50 – 500   mg / L ) and temperatures (25–45°C), were interpreted using the Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich isotherms, with the Langmuir model providing a better fit ( R 2 ≥ 0.9997 ) and a maximum adsorption capacity of 497.51 mg/g at 45°C. Under the examined conditions, the values of the thermodynamic parameters free energy, enthalpy, and entropy indicate a spontaneous, endothermic, and physisorption adsorption process. The kinetic data of the adsorption process were very well described by a pseudo-second-order model ( R 2 ≥ 0.9996 ). However, surface diffusion seems to be the main rate-controlling step. Thus, we concluded that PACK shows commercial potential for the removal of cationic dyes such as CV from industrial effluent.

scholarly journals OPTIMIZATION OF NICKEL (II) AND CHROMIUM (III) REMOVAL FROM CONTAMINATED WATER USING SORGHUM BICOLOR

2017 ◽  
Vol 36 (3) ◽  
pp. 960-972
Author(s):  
LT Adewoye ◽  
SI Mustapha ◽  
AG Adeniyi ◽  
JO Tijani ◽  
MA Amoloye ◽  
...  
Keyword(s):  
Sorghum Bicolor ◽  
Metal Ion ◽  
Ion Concentration ◽  
Optimum Process ◽  
Process Conditions ◽  
Order Kinetic ◽  
Freundlich Model ◽  
Adsorbent Dosage ◽  
Equilibrium Data ◽  
Pseudo Second Order

A central composite design (CCD) under the response surface methodology (RSM)was used to study the effect of three adsorption variables (pH, initial concentration, and adsorbent dosage) in order to determine the optimum process conditions for the adsorptions of Ni (II) and Cr (III) onto sulphuric acid modified sorghum bicolor activated carbon (SBAC).This study yielded removal efficiency of 98.89 % for Ni (II) and 94.27 % for Cr (III) ion under optimal conditions of pH (8), initial metal ion concentration (25 mg/L), adsorbent dosage (10 mg) and pH (7), initial metal ion concentration (5 mg/L), dosage (15 mg);respectively. Statistical analysis of variance results showed a good correlation existed between the experimental and predicted data with R2 values of 0.99 for Ni and 0.98 for Cr. The equilibrium data for Ni (II) adsorption was best described using Freundlich model while Langmuir model best fit Cr (III) adsorption. The mechanism of adsorption for both Ni and Cr adsorptions on SBAC followed Pseudo second order kinetic model.  http://dx.doi.org/10.4314/njt.v36i3.41

Cationization of cotton with ovalbumin to improve dyeing of modified cotton with cochineal natural dye

2020 ◽  
Vol 90 (15-16) ◽  
pp. 1805-1822 ◽  
Author(s):  
Fernando Giacomini ◽  
Antônio Augusto Ulson de Souza ◽  
Maria Angélica Simões Dornellas de Barros
Keyword(s):  
Dye Adsorption ◽  
Cross Linking ◽  
Light Fastness ◽  
Order Model ◽  
X Ray ◽  
Environmentally Sustainable ◽  
Ph Values ◽  
Equilibrium Data ◽  
Pseudo Second Order ◽  
Harmful Effects

Natural dyeing of cotton is commonly associated with the use of metallic mordants, which are related to harmful effects on the environment and human health. For this reason, more environmentally sustainable processes should be investigated. In this work, cotton was cationized with ovalbumin by cross-linking in order to improve its dyeing with natural cochineal dye. Different pretreatments with chitosan, synthetic cationizer, and metal mordants were also carried out at different dyeing pH values. The best dyeing results were obtained at pH 3 at 55℃ on fiber pretreated by padding with a liquor concentration of 150 g L−1 ovalbumin and 90 g L−1 cross-linker. This cationization of ovalbumin by cross-linking was confirmed by Fourier transform infrared spectroscopy, energy dispersive X-ray spectroscopy, changes in the isoelectric point of the fabrics, and scanning electron microscopy. The kinetic study showed that the pseudo second-order model best represented the experimental data, indicating that the dyeing can be controlled by the chemisorption process. The equilibrium data were easily adjusted by the Langmuir model, indicating the formation of a dye monolayer in the cationized cotton. The thermodynamic study indicated that dye adsorption was spontaneous and exothermic. The cationized fabric with ovalbumin presented low wash fastness, good light fastness, and increase in tensile strength and crease recovery, with a decrease of hydrophilicity when compared with other treatments. Thus, ovalbumin is a viable and eco-friendly alternative in the dyeing of cotton with cochineal.

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