scholarly journals Synthesis and characterization of arginine-doped heliotrope leaves with high clean-up capacity for crystal violet dye from aqueous media

2021 ◽  
Author(s):  
Lahoucine Brini ◽  
Abdelghani Hsini ◽  
Yassine Naciri ◽  
Asmae Bouziani ◽  
Zeeshan Ajmal ◽  
...  
Keyword(s):  
Crystal Violet ◽  
Contact Time ◽  
Fourier Transforms ◽  
Low Cost ◽  
Aqueous Media ◽  
Dye Adsorption ◽  
Batch Process ◽  
Scanning Calorimetry ◽  
Crystal Violet Dye ◽  
Ft Ir

Abstract Novel an arginine-modified Heliotrope leaf (Arg@HL) was used as adsorbent for the crystal violet (CV) dye adsorption in a batch process. The physicochemical and morphological composition of Arg@HL were characterized by field-emission-scanning-electron-microscopy (FE-SEM), Fourier transforms infrared (FT-IR) spectroscopy, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC). The experiments were carried out to investigate the factors that influence the dye uptake by the adsorbent, such as the contact time under agitation, adsorbent amount, initial dye concentration, temperature and pH of dye solution. The optimum conditions of adsorption were found on the batch scale as followed: CV concentration of 20 mg·L−1, an amount of 0.75 g·L−1 of the adsorbent, 90 min contact time, 6 pH and 25 °C temperature for Arg@HL. The results confirmed a second-order model explaining the dye crystal violet's adsorption's kinetics by Arg-Heliotrope leaves. The Langmuir model effectively defines the adsorption isotherms. The results revealed that the Arg@HL has the potential to be used as a low-cost adsorbent for the removal of CV dye from aqueous solutions.

scholarly journals Engineering of Calcium Alginate- PANI@Sawdust Wood hydrogel Bio-beads for the Removal of the Sulfonate Groups-Containing Orange G dye from Aqueous Solution

2021 ◽  
Author(s):  
ABDELAZIZ IMGHARN ◽  
Nouh Aarab ◽  
Abdelghani Hsini ◽  
Yassine Naciri ◽  
Mohammed Elhoudi ◽  
...  
Keyword(s):  
Calcium Alginate ◽  
Fourier Transforms ◽  
Low Cost ◽  
Aqueous Media ◽  
Freundlich Isotherm ◽  
Batch Tests ◽  
Orange G ◽  
Ft Ir ◽  
Interfering Ions ◽  
Ft Ir Spectroscopy

Abstract The aim of this work is to investigate the adsorption performance of orange G (OG) dye from aqueous solutions employing PANI@sawdust biocomposite enrobed by calcium-alginate biobeads (Alg-PANI@SD). The as-prepared adsorbent was characterized by scanning-electron-microscopy (SEM), X-ray energy dispersive spectroscopy (EDS) and Fourier transforms infrared (FT-IR) spectroscopy, and used to remove Orange G dye from water. batch tests were performed as a function of adsorbent dosage, pH, contact time, interfering ions and initial OG dye concentration. Experimental results show that the kinetic model of pseudo-first-order (PFO) and Freundlich isotherm provided a good fitting of the whole experimental data. The results revealed that the as-prepared tricomposite Alg-PANI@SD, has the potential to be applied as a low-cost adsorbent for the adsorption of OG dye from aqueous media.

scholarly journals Efficient removal of crystal violet dye from aqueous solutions using sodium hydroxide modified avocado shells: kinetics and isotherms modeling

2021 ◽  
Author(s):  
M. Ait Haki ◽  
A. Imgharn ◽  
N. Aarab ◽  
A. Hsini ◽  
A. Essekri ◽  
...  
Keyword(s):  
Sodium Hydroxide ◽  
Crystal Violet ◽  
Electrostatic Interactions ◽  
Fourier Transforms ◽  
Dye Adsorption ◽  
Order Kinetic ◽  
Efficient Removal ◽  
Ionic Strength Effect ◽  
Crystal Violet Dye ◽  
Kinetics And Isotherms

Abstract The main objective of this study is to optimize a new composite for the depollution of contaminated water. The sodium hydroxide-modified Avocado shells (NaOH-AS) were firstly prepared, characterized by field-emission-scanning-electron-microscopy (FE-SEM), X-ray energy dispersive spectroscopy (EDS) and Fourier transforms infrared (FT-IR) spectroscopy, and applied for efficient removal of Crystal violet dye (CV) in wastewater. In addition, the adsorption in a batch system of CV dye on the NaOH-AS material was studied. Therefore, we accomplished a parametric study of the adsorption by studying the effect of several important parameters on the decolorizing power of the used material, namely, initial pH, contact time, initial CV dye concentration, temperature, and the ionic strength effect on the CV dye adsorption process were systematically assessed. The highest adsorption efficiency of CV dye (>96.9%) by NaOH-AS was obtained at pH >8. The pseudo-second-order kinetic model gave the best description of the adsorption kinetic of CV dye on the AS and NaOH-AS adsorbents. Besides, the mass transfer of CV dye molecules from the solution to the adsorbent surface occurred in three sequential stages (boundary layer diffusion, intraparticle diffusion and adsorption equilibrium). The adsorption isotherm data were best fitted with the Freundlich model. The adsorption capacity of AS increased from 135.88 to 179.80 mg g−1 after treatment by 1 M NaOH. The thermodynamic study showed that CV dye adsorption onto NaOH-AS was an exothermic and feasible process. The electrostatic interactions acted as the only forces governing the CV adsorption mechanism. The NaOH-AS demonstrated a satisfactory reusability. Therefore, we can state that the as-developed NaOH-AS material has a potential application prospect as an efficient adsorbent for CV dye from wastewaters.

scholarly journals Robust Superhydrophobic Cellulose Nanofiber Aerogel for Multifunctional Environmental Applications

Polymers ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 495 ◽  
Author(s):  
Hasan. M. ◽  
Deepu Gopakumar ◽  
Vishnu Arumughan ◽  
Yasir Pottathara ◽  
Sisanth K. S. ◽  
...  
Keyword(s):  
Crystal Violet ◽  
Hydrophobic Interactions ◽  
Low Cost ◽  
Cellulose Nanofibers ◽  
Dye Adsorption ◽  
Research Area ◽  
Textile Dyes ◽  
Cellulose Nanofiber ◽  
Crystal Violet Dye ◽  
Modified Cellulose

The fabrication of superadsorbent for dye adsorption is a hot research area at present. However, the development of low-cost and highly efficient superadsorbents against toxic textile dyes is still a big challenge. Here, we fabricated hydrophobic cellulose nanofiber aerogels from cellulose nanofibers through an eco-friendly silanization reaction in liquid phase, which is an extremely efficient, rapid, cheap, and environmentally friendly procedure. Moreover, the demonstrated eco-friendly silanization technique is easy to commercialize at the industrial level. Most of the works that have reported on the hydrophobic cellulose nanofiber aerogels explored their use for the elimination of oil from water. The key novelty of the present work is that the demonstrated hydrophobic cellulose nanofibers aerogels could serve as superadsorbents against toxic textile dyes such as crystal violet dye from water and insulating materials for building applications. Here, we make use of the possible hydrophobic interactions between silane-modified cellulose nanofiber aerogel and crystal violet dye for the removal of the crystal violet dye from water. With a 10 mg/L of crystal violet (CV) aqueous solution, the silane-modified cellulose nanofiber aerogel showed a high adsorption capacity value of 150 mg/g of the aerogel. The reason for this adsorption value was due to the short-range hydrophobic interaction between the silane-modified cellulose nanofiber aerogel and the hydrophobic domains in crystal violet dye molecules. Additionally, the fabricated silane-modified cellulose nanofiber hydrophobic aerogels exhibited a lower thermal conductivity value of 0.037 W·m−1 K−1, which was comparable to and lower than the commercial insulators such as mineral wools (0.040 W·m−1 K−1) and polystyrene foams (0.035 W·m−1 K−1). We firmly believe that the demonstrated silane-modified cellulose nanofiber aerogel could yield an eco-friendly adsorbent that is agreeable to adsorbing toxic crystal violet dyes from water as well as active building thermal insulators.

scholarly journals A Novel Efficient MPEG-Chitosan/HA Biopolymer for Adsorption of the Anticancer SN-38 Liquid Dispersions: Kinetics, Thermodynamic and Ex-Vivo Release Evaluation

2021 ◽  
Vol 65 (4) ◽  
Author(s):  
Faezeh Sharifi ◽  
Mansour Jahangiri ◽  
Pedram Ebrahimnejad
Keyword(s):  
Drug Delivery ◽  
Fourier Transforms ◽  
Ex Vivo ◽  
Low Cost ◽  
Order Kinetic ◽  
Scanning Calorimetry ◽  
Release Process ◽  
El Sistema ◽  
Diffusion Phenomena ◽  
Ft Ir

Abstract. Amongst several drug delivery schemes for perfect drug delivery comprise biocompatibility, selective aiming of cancer cells, low-cost, and safe process of nanoparticle preparation. In this work, a new mPEG-chitosan/HA biopolymer was prepared as adsorbent nanoparticles (mNPs) for an efficient drug delivery system.  The mNPs was synthesized by conjugating poly (ethylene glycol) methyl ether (mPEG) to chitosan and prepared through ionic gelation between mPEG-chitosan and hyaluronic acid (HA). The prepared mNPs were used to adsorption/release of 7-ethyl-10-hydroxycamtothecin (SN-38) from its liquid dispersions. The mNPs adsorbent was characterized by Fourier transforms infrared spectroscopy (FT-IR), differential scanning calorimetry (DSC), scanning electron microscopy (SEM). The results demonstrated that the adsorption isotherm of SN-38 on mNPs follows Langmuir model, and the adsorption capacity was 346.511 mg g-1. Besides, the pseudo-first order kinetic well fitted the equilibrium data. Further, thermodynamic parameters including ΔH, ΔG and ΔS were calculated which demonstrated that the physical spontaneous adsorption was prevailing. In addition, the ex- vivo release of SN-38 from mNPs were in good agreement with Korsmeyer-Peppas equation indicating the drug release process was governed by diffusion phenomena. The above results revealed that mNPs containing SN-38 was a good candidate for the drug delivery systems.   Resumen. Dentro de las diferentes propiedades importantes de los sistemas de liberación de fármacos se encuentran la biocompatibilidad, el ataque selectivo a las células cancerosas, el bajo costo y los procesos adecuados de preparación de nanopartículas. En este trabajo, un nuevo biopolímero de mPEG-chitosan/HA se preparó en la forma de nanopartículas (mNPs) para el uso como un sistema de liberación controlada de fármacos. Las nanopartículas se sintetizaron incorporando el éter metílico de poli(etilenglidol) al quitosano, y se prepararon a través de la gelación iónica entre el mPEG-quitosano y el ácido hialurónico (HA). Las nanopartículas así preparadas se probaron en su efectividad para la absorción y liberación de 7-etil-10-hidroxicamtotecina (SN-38) en forma de dispersiones líquidas. El absorbente hecho a partir de las nanopartículas se caracterizó mediante espectroscopía infrarroja de transformada de Fourier (FT-IR), calorimetría diferencial de barrido (DSC) y microscopía electrónica de barrido (SEM). Se encontró que la isoterma de adsorción de la muestra de nanopartículas conteniendo SN-38 se ajusta al modelo de Langmuir, siendo el valor de la capacidad de adsorción de 346.511 mg g-1. El modelo cinético de seudo primer orden se ajusta adecuadamente a los datos obtenidos al equilibrio. Más aún, los parámetros termodinámicos tales como ΔH, ΔG and ΔS se pudieron calcular, lo que indica que la adsorción física espontánea es el mecanismo que prevalece. Además, los datos de liberación ex- vivo de SN-38 a partir de las nanopartículas se pueden ajustar a la ecuación de Korsmeyer-Peppas, indicando que el proceso de liberación del fármaco está gobernado por un proceso de difusión. Los resultados anteriores indican que el sistema de nanopartículas conteniendo SN-38 es un buen candidato para desarrollar un sistema de liberación controlada de fármacos. 

Parameters Affecting Dye Adsorption - Using Graphene Coated Sand (GSC)

2018 ◽  
Vol 4 (02) ◽  
Author(s):  
Seroor Atalah Khaleefa Alia ◽  
Dr. Mohammed Ibrahimb ◽  
Hussein Ali Hussein
Keyword(s):  
Heavy Metals ◽  
Contact Time ◽  
Organic Dyes ◽  
Low Cost ◽  
Dye Adsorption ◽  
Contaminated Water ◽  
Maximum Adsorption Capacity ◽  
Engineering Designs ◽  
Heavy Metals Ions ◽  
Coated Sand

Adsorption is most commonly applied process for the removal of pollutants such as dyes and heavy metals ions from wastewater. The present work talks about preparing graphenic material attached sand grains called graphene sand composite (GSC) by using ordinary sugar as a carbon source. Physical morphology and chemical composition of GSC was examined by using (FTIR, SEM, EDAX and XRD). Efficiency of GSC in the adsorption of organic dyes from water was investigated using reactive green dye with different parameters such as (ph, temperature, contact time and dose). Adsorption isotherm was also studied and the results showed that the maximum adsorption capacity of dye is 28.98 mg/g. This fast, low-cost process can be used to manufacture commercial filters to treat contaminated water using appropriate engineering designs.

Degradation of Colored Polystyrene Films

2018 ◽  
Vol 930 ◽  
pp. 254-257 ◽  
Author(s):  
Francisca Pereira de Araújo ◽  
Josy Anteveli Osajima ◽  
Mônica Regina Silva de Araujo ◽  
Edson Cavalcanti da Silva Filho ◽  
João Sammy Nery de Souza
Keyword(s):  
Crystal Violet ◽  
Carbonyl Compounds ◽  
Low Cost ◽  
Chemical Properties ◽  
Polymer Materials ◽  
Visible Radiation ◽  
No Formation ◽  
Crystal Violet Dye ◽  
Physical And Chemical ◽  
And Chemical Properties

Polystyrene is commercial polymer of extensive use in industrial scale due to great physical and chemical properties and low cost. Lifespan of polymer materials can be changed by incorporation of additions to polymeric matrix.The present study aimed to evaluate the influence of crystal violet dye in polystyrene matrices when irradiated by visible radiation. The samples were studied in the form of films, in which solution of crystal violet (5.0x10-4mol.L-1) was added to the PS solution (8% w / w). The films were irradiated with commercial lamp for 150 hours and analyzed with UV-Vis and FTIR. The results showed that the dye degraded at a rate of 16%, however the FTIR analysis revealed that polystyrene did not degrade under the conditions studied, since no formation of carbonyl compounds was observed.

scholarly journals Copolymer Based on Polyglycerol-Acrylate-Lactate as Potential Water Viscosifier and Surfactant for Enhanced Oil Recovery

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
M. P. Amaya-Gómez ◽  
L. M. Sanabria-Rivas ◽  
A. M. Díaz-Lasprilla ◽  
C. Ardila-Suárez ◽  
R. H. Castro-García ◽  
...  
Keyword(s):  
Enhanced Oil Recovery ◽  
Oil Recovery ◽  
Chemical Structure ◽  
Low Cost ◽  
Surfactant Flooding ◽  
Scanning Calorimetry ◽  
Water Viscosity ◽  
Ft Ir ◽  
Surface Performance ◽  
Polymeric Solutions

Polymer and surfactant flooding are widely applied processes in enhanced oil recovery (EOR) in which viscous polymers or surfactants aqueous solutions are introduced in oil reservoirs to rise the recovery of the remaining oil. In this regard, one of the challenges of EOR practices is the use of efficient but low-cost viscosifier and surfactant polymers. This work is aimed at synthesizing a polyglycerol derived from the biodegradable and nontoxic monomer, glycerol, and evaluating the effect of its copolymerization on rheological and interfacial properties, which were tested in water and brine for the former and in the water/oil system for the last properties. The copolymers were synthesized using a polyglycerol backbone, acrylic acid, lactic acid, and oleic acid. The chemical structure of copolymers was characterized by Fourier transform infrared spectroscopy (FT-IR), thermogravimetry (TG), and differential scanning calorimetry (DSC). The viscosity and the interfacial tension (IFT) of polymeric solutions were tested. Thus, the viscosity and surface performance of the prepared polymer solutions in distilled water and brine were analyzed according to the structure of the synthesized polymers. The results showed that the synthesized polymers modified water viscosity and surface tension between water and oil. The developed polymers could be candidates for applications in enhanced oil recovery and related applications.

scholarly journals Animal Biopolymer-Plant Biomass Composites: Synergism and Improved Sorption Efficiency

2020 ◽  
Vol 4 (1) ◽  
pp. 15 ◽  
Author(s):  
Mohamed H. Mohamed ◽  
Inimfon A. Udoetok ◽  
Lee D. Wilson
Keyword(s):  
Wheat Straw ◽  
Active Sites ◽  
Plant Biomass ◽  
Low Cost ◽  
Aqueous Media ◽  
Dye Adsorption ◽  
Anionic Dyes ◽  
Adsorption Affinity ◽  
Variable Weight ◽  
Composite Pellets

Pelletized biomaterial composites that contain chitosan (C) and torrefied wheat straw (S) at variable weight composition (C:S) were prepared using a facile blending process. The fractional content of the wheat straw was studied to elucidate the role of biomass on the pelletized product and effects of S-content on the physicochemical properties relevant to adsorption phenomena. Chitosan pellets (with and without S) were characterized by spectroscopic (FT-IR and 13C NMR) and thermal (TGA and DSC) techniques to provide support for their respective C:S composition. Confocal microscopy using fluorescein (FL) as a dye probe revealed the presence and an increase in the accessibility of the active sites for the composite pellets according to the S-content (wt %). Equilibrium and kinetic sorption studies using FL and reactive black (RB) dyes revealed an incremental adsorption affinity of the pellets with anionic dyes in variable charge states (FL and RB). The trend for dye adsorption parallels the incremental S-content (wt %) in the composite pellets. This study reports a first-example of a low-cost, facile, and sustainable approach for the valorization of straw and chitosan suitable for sorption-based applications in aqueous media.

Enhancement of crystal violet dye adsorption on Artocarpus camansi peel through sodium hydroxide treatment

2017 ◽  
Vol 58 ◽  
pp. 320-331 ◽  
Author(s):  
Hei Ing Chieng ◽  
Linda B. L. Lim ◽  
Namal Priyantha
Keyword(s):  
Sodium Hydroxide ◽  
Crystal Violet ◽  
Dye Adsorption ◽  
Crystal Violet Dye ◽  
Sodium Hydroxide Treatment

An efficient removal of crystal violet dye from waste water by adsorption onto TLAC/Chitosan composite: A novel low cost adsorbent

2017 ◽  
Vol 96 ◽  
pp. 324-333 ◽  
Author(s):  
H. Jayasantha Kumari ◽  
P. Krishnamoorthy ◽  
T.K. Arumugam ◽  
S. Radhakrishnan ◽  
D. Vasudevan
Keyword(s):  
Waste Water ◽  
Crystal Violet ◽  
Low Cost ◽  
Efficient Removal ◽  
Crystal Violet Dye ◽  
Chitosan Composite
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