scholarly journals Kinetics, Isotherms and Thermodynamic Modeling of Liquid Phase Adsorption of Crystal Violet Dye onto Shrimp-Waste in Its Raw, Pyrolyzed Material and Activated Charcoals

2019 ◽  
Vol 9 (24) ◽  
pp. 5337 ◽  
Author(s):  
John Rojas ◽  
David Suarez ◽  
Alfredo Moreno ◽  
Javier Silva-Agredo ◽  
Ricardo A. Torres-Palma
Keyword(s):  
Crystal Violet ◽  
Freundlich Isotherm ◽  
Point Of Zero Charge ◽  
Shrimp Waste ◽  
Kinetics Of Adsorption ◽  
Liquid Phase Adsorption ◽  
High Ionization ◽  
Crystal Violet Dye ◽  
Adsorption Data ◽  
Kinetics Of

Shrimp waste and its charcoal derivatives were evaluated for the removal of crystal violet. Activation was conducted at 500 °C with phosphoric acid at the 1:2 and 1:3 ratios. Activated charcoals were more porous and had a more roughly surface containing mainly C, O, Ca N, and P. Equilibrium adsorption data were fitted using seven kinetic and six isotherms models. Activation created acidic moieties (>4700 µmol/g) and reduced the point of zero charge (<2.5). Freundlich isotherm best described the uptake of the dye onto the adsorbents suggesting a heterogeneous adsorption, whereas the Bangham and Avrami models best described the kinetics of adsorption process. An endothermic and spontaneous physisorption was responsible for the sorption phenomena in most adsorbents. The high removal of crystal violet was attributed to the high ionization capacity of the adsorbent coupled with the high external surface area (>44 m2/g). The best adsorption capacity (208 mg/g) was found for the activated and charred materials, whereas the lowest one (3.9 mg/g) was found for the pyrolyzed material. This research creates the possibility to deal with two environmental problems: (i) the reuse of shrimp waste and (ii) the removal of water pollutants such as crystal violet.

scholarly journals Adsorption of Crystal Violet Dye onto Tamarind Seed Powder

2010 ◽  
Vol 7 (3) ◽  
pp. 975-984 ◽  
Author(s):  
Himanshu Patel ◽  
R. T. Vashi
Keyword(s):  
Crystal Violet ◽  
Adsorption Mechanism ◽  
Freundlich Isotherm ◽  
Tamarind Seed ◽  
Crystal Violet Dye ◽  
Adsorption Data ◽  
Equilibrium Data ◽  
Intra Particle Diffusion ◽  
Pseudo Second Order ◽  
Shell Powder

The present investigation describes adsorption of crystal violet dye from its aqueous solution onto tamarind (Tamarindus indica) fruit shell powder. Initial concentration, agitation speed and pH with various temperature have been studied, in which pH was found to be most effective. The adsorption data were mathematically analyzed using adsorption isotherm like Freundlich and Langmuir isotherm to study adsorption mechanism of crystal violet onto this seed powder. Freundlich isotherm was found to be most applicable. The equilibrium data were applied to intra-particle diffusion and adsorption kinetics. The reaction was found to be pseudo second order.

scholarly journals Biosorption of Cr(VI) from Aqueous Solutions UsingTrametes Versicolor PolyporusFungi

2008 ◽  
Vol 5 (3) ◽  
pp. 499-510 ◽  
Author(s):  
M. Venkata Subbaiah ◽  
S. Kalyani ◽  
G. Sankara Reddy ◽  
Veera M. Boddu ◽  
A. Krishnaiah
Keyword(s):  
Trametes Versicolor ◽  
Isotherm Models ◽  
Model Parameters ◽  
Kinetics Of Adsorption ◽  
Chromium Vi ◽  
Adsorption Isotherm Models ◽  
Adsorption Data ◽  
Naoh Solution ◽  
Sorption Parameters ◽  
Kinetics Of

Removal of chromium(VI) from aqueous solution was studied using abundantly availabletrametes versicolor polyporusfungi as biosorbing medium under equilibrium and column flow conditions. Various sorption parameters such as contact time, effect of pH, concentration of Cr(VI) and amount of biomass on the adsorption capacity of the biosorbent were studied. The equilibrium adsorption data were fitted to Freundlich and Langmuir adsorption isotherm models and the model parameters are evaluated. In addition, the data were used to predict the kinetics of adsorption. The results indicated that the adsorption of Cr(VI) on fungi followed second order kinetics. The column flow adsorption data were used to predict break through curves. The fungi loaded with Cr(VI) was regenerated with 0.1 M NaOH solution and the regenerated biomass was used in the subsequent adsorptiondesorption cycles. The experimental results demonstrated that thetrametes versicolor polyporusfungi could be used as sorbent for immobilizing Cr(VI).

scholarly journals Preparation of a Novel Activated Carbon from Cassava Sludge for the High-Efficiency Adsorption of Hexavalent Chromium in Potable Water: Adsorption Performance and Mechanism Insight

Water ◽  
2021 ◽  
Vol 13 (24) ◽  
pp. 3602
Author(s):  
Ling Li ◽  
Yan Li ◽  
Yiqi Liu ◽  
Lei Ding ◽  
Xiaopeng Jin ◽  
...  
Keyword(s):  
Activated Carbon ◽  
High Efficiency ◽  
Freundlich Isotherm ◽  
Pore Filling ◽  
Solution Ph ◽  
Kinetics Of Adsorption ◽  
Metal Elements ◽  
Intra Particle Diffusion ◽  
Equilibrium Process ◽  
Kinetics Of

Particularly, because of the leakage risk of metal elements from sludge carbon, little attention has been focused on using sludge activated carbon as an adsorbent for the removal of Cr (VI) from contaminated water sources. Herein, a novel sludge carbon derived from dewatered cassava sludge was synthesized by pyrolysis using ZnCl2 as an activator at the optimal conditions. The prepared sludge activated carbon possessed a large BET surface (509.03 m2/g), demonstrating an efficient removal for Cr (VI). Although the time to reach equilibrium was extended by increasing the initial Cr (VI) concentration, the adsorption process was completed within 3 h. The kinetics of adsorption agreed with the Elovich model. The whole adsorption rate was controlled by both film and intra-particle diffusion. The Cr (VI) removal efficiency increased with elevating temperature, and the adsorption equilibrium process followed the Freundlich isotherm model. The adsorption occurred spontaneously with endothermic nature. The removal mechanism of Cr (VI) on the prepared sludge activated carbon depended highly on solution pH, involving pore filling, electrostatic attraction, reduction, and ion exchange. The trace leakage of metal elements after use was confirmed. Therefore, the prepared sludge activated carbon was considered to be a highly potential adsorbent for Cr (VI) removal from contaminated raw water.

Adsorption of crystal violet dye by a zeolite-montmorillonite nano-adsorbent: modelling, kinetic and equilibrium studies

Clay Minerals ◽  
2019 ◽  
Vol 54 (4) ◽  
pp. 357-368 ◽  
Author(s):  
Malihe Sarabadan ◽  
Hadis Bashiri ◽  
Seyed Mahdi Mousavi
Keyword(s):  
Removal Efficiency ◽  
Crystal Violet ◽  
Freundlich Isotherm ◽  
Optimum Conditions ◽  
Experimental Conditions ◽  
Equilibrium Studies ◽  
Adsorbent Dosage ◽  
Crystal Violet Dye ◽  
Nano Adsorbent ◽  
Maximum Removal

AbstractA zeolite-montmorillonite (zeolite-Mt) nano-adsorbent was prepared by calcination at 600°C. The synthesized nano-adsorbent was tested for removal of a toxic and cationic dye (crystal violet) from water, and it was characterized by various techniques. The effects of variables such as pH, temperature, adsorbent dosage and initial dye concentration on the removal efficiency of the dye were investigated by response surface methodology (RSM). Experimental conditions were optimized by RSM to achieve the maximum dye removal efficiency. Optimum conditions for maximum removal of dye were obtained at pH 9, temperature of 25°C, adsorbent dosage of 2 g L−1 and initial dye concentration of 40 mg L−1. Under these conditions, the maximum removal efficiency obtained was 99.9%. Various isotherms were applied to study adsorption equilibrium, and of these, the Freundlich isotherm provided the best fit. In addition, the fractal-like integrated kinetic Langmuir model was the most appropriate among several kinetic models. The thermodynamic parameters were also determined. The zeolite-Mt prepared under optimum conditions displayed a greater adsorption capacity than activated carbon (manufactured by Merck) and than various other adsorbents.

Kinetics Of Adsorption Of Proteins From Human Plasma Onto Foreign Surfaces

1981 ◽  
Author(s):  
J L Brash ◽  
S Uniyal
Keyword(s):  
Human Plasma ◽  
Surface Concentration ◽  
Kinetics Of Adsorption ◽  
Hydrophilic Surfaces ◽  
Adsorption Data ◽  
First Occurrence ◽  
Foreign Surface ◽  
Kinetics Of ◽  
Hydrophilic Materials ◽  
Zero Time

It is believed that adsorption of proteins is the first occurrence after blood/foreign surface contact. The composition of the protein layer, how it depends on surface properties, and how it changes with time are essentially unknown. The objective of this work was to develop data relevant to these questions. To this end, the quantities of �albumin, fibrinogen and IgG adsorbed on seven surfaces from human plasma as a function of time were measured. Human plasma (ACD anticoagulant) was diluted 1:4 with tris buffer. Purified proteins were labelled with iodine isotopes using the IC1 method and added to the plasma as tracers. Materials studied include several segmented polyether-urethanes, both hydrophilic and hydrophobic, glass, siliconized glass (SG), polystyrene (PS) and polyethylene (PE).The results may be summarized as follows: Fibrinogen: Within the 2 min to 3 h range of contact times, fibrinogen was not detected on any of the hydrophilic surfaces. On PE and SG the quantity adsorbed passed through a maximum between zero time and 2 min, then declined to near zero. Only on PS was adsorption substantial (0.4 μg cm-2) and constant with time, similar to that from a solution of fibrinogen. Albumin: Albumin was also not detected on the hydrophilic materials. In general its surface concentration when it was adsorbed (hydrophobic surfaces) was similar to that observed for solutions of albumin. IgG: IgG was detected on all surfaces. The surface concentrations were low (about 0.1 μg cm-2) compared to solution values but were generally constant with time.The following conclusions are drawn: (1) The plasma itself modifies adsorption. Therefore solution adsorption data cannot be used to predict plasma adsorption. (2) Contrary to popular belief, fibrinogen is absent or transient on most surfaces. (3) IgG appears to be ubiquitous as a component of protein layers adsorbed from Plasma.

Crystal Violet Dye Removal from Aqueous Solutions Using Elodea Canadensis as Biofilter

2017 ◽  
Vol 68 (10) ◽  
pp. 2270-275
Author(s):  
Anamaria Torok ◽  
Boldizsar Nagy ◽  
Szende Tonk ◽  
Erzsebet Buta ◽  
Robert Szep ◽  
...  
Keyword(s):  
Crystal Violet ◽  
Stress Responses ◽  
Active Sites ◽  
Aquatic Plant ◽  
Freundlich Isotherm ◽  
Elodea Canadensis ◽  
Second Order ◽  
Order Kinetic ◽  
Operational Parameters ◽  
Crystal Violet Dye

The phytoremediation of Crystal violet dye was developed using the aquatic plant Elodea canadensis as biofilter. We analyzed the role of functional groups in phytoremediation by aquatic plants using the Fourier transform infrared spectroscopy (FTIR). The aquatic plant�s abiotic stress responses were evaluated under exposure of 20 - 90 mg/L initial dye concentration, where a significant decrease of the photosynthetic pigments content suggests the plant�s biosynthesis deregulation at higher concentrations. We determined the effect of operational parameters such as contact time, plant quantity initial concentration, initial pH and temperature on the removal efficiency. Data were analysed using the kinetic (pseudo-first- and second-order) and isotherm (Langmuir, Freundlich and Dubinin-Radushkevich) models. Our results show that the phytoremediation process follows the pseudo-second-order kinetic model, meaning that it takes places as chemisorption. The Crystal violet uptake was successfully described using the Freundlich isotherm model as a multilayer adsorption with heterogeneous energetic distribution of active sites.

Surface Properties and Selenate Adsorption of Hydroxyiron-Vermiculite Complexes

2012 ◽  
Vol 482-484 ◽  
pp. 1201-1204 ◽  
Author(s):  
Shi Yong Wei
Keyword(s):  
Fractal Dimension ◽  
Surface Properties ◽  
Langmuir Isotherm ◽  
Ph Value ◽  
Freundlich Isotherm ◽  
Point Of Zero Charge ◽  
X Ray Diffraction ◽  
X Ray ◽  
Adsorption Capacities ◽  
Adsorption Data

Hydroxyiron-vermiculite complexes (Fe-Vermiculite) were prepared and identified using X-ray diffraction (XRD). The surface properties and selenate adsorption characteristics of Fe-Vermiculite were investigated. The specific surface area, surface fractal dimension D value and the pH value of the point of zero charge (pHPZC) of vermiculite were 287.19 m2/g, 2.14, and 2.87, respectively, and those of Fe-Vermiculite were 312.48 m2/g, 2.59, and 5.74, respectively. At pH 5.5, the maximum adsorption capacities (qmax) for selenate of vermiculite and Fe-Vermiculite were 4.36 and 9.12 mg/g, respectively. Langmuir isotherm was very suitable for describing the selenate adsorption of vermiculite (R2 =0.993), and Freundlich isotherm could fit the adsorption data for selenate by Fe-Vermiculite (R2 =0.981).

scholarly journals Study of arsenic (V) removal of water by using agglomerated alumina

Nova Scientia ◽  
2019 ◽  
Vol 11 (23) ◽  
pp. 01-25 ◽  
Author(s):  
Rafael Romero Toledo ◽  
Víctor Ruiz Santoyo ◽  
Luis M. Anaya Esparza ◽  
Alejandro Pérez Larios ◽  
Merced Martínez Rosales
Keyword(s):  
Low Cost ◽  
Freundlich Isotherm ◽  
Point Of Zero Charge ◽  
Order Kinetic ◽  
Global Environmental ◽  
Effective Removal ◽  
Adsorption Processes ◽  
Removal Of Arsenic ◽  
Adsorption Desorption ◽  
Kinetics Of

Arsenic is a toxic element for human health. It persists in the environment as a result of natural and anthropic contamination, generating nocive effects for consumers. Some of them can be cancer, cardiovascular disorders, hypotension, metabolic disease and peripheral neuropathy. Adsorption is considered to be one of the most effective technologies widely used in global environmental protection areas. The objective of this study was to generate a low cost agglomerated alumina adsorbent (A-1) for the effective removal of arsenic (V) from water and its comparison with a commercial agglomerated alumina (A-2). Both of them of 5 mm of diameter. The physicochemical properties of the adsorbents were characterized by various techniques, such as: XRF, zeta potential, XRD, adsorption-desorption of N2 and FE-SEM/EDS. Batch experiments were performed to evaluate the efficiency of removal of As (V) from water by A-1 and A-2. The point of zero charge of A-1 and A-2 was at pH 8.5 and 8.1, respectively. The experimental results in batches indicated that agglomerate A-1 has a higher adsorption capacity than A-2 (1.212 mg∙g-1; 1.058 mg∙g-1) in similar conditions, concentration of 15 mg∙L-1 of As (V), temperature (20± 2 °C) and pH 7. The adsorption processes of As (V) in A-1 and A-2 followed the kinetics of Pseudo-first order kinetic and the Freundlich isotherm. The results showed that the agglomerate A-1 is an attractive adsorbent for the effective removal of As (V) from water.

Adsorption of Bisphenol-A by HDTMA Modified Clinoptilolite

2011 ◽  
Vol 71-78 ◽  
pp. 717-721
Author(s):  
Hong Yu Wang ◽  
Hang Li Zhang ◽  
Qian Zhao ◽  
Hui Fei Huang
Keyword(s):  
Bisphenol A ◽  
Rate Constant ◽  
Absorption Rate ◽  
Ph Value ◽  
Freundlich Isotherm ◽  
Ammonium Bromide ◽  
Solution Ph ◽  
Kinetics Of Adsorption ◽  
Modified Clinoptilolite ◽  
Kinetics Of

The adsorption of bisphenol-A (BPA) by hexadecyl trimethyl ammonium bromide (HDTMA) modified clinoptilolite was presented. In this paper, the equilibrium adsorption of BPA by HDTMA modified clinoptilolite was described by Freundlich isotherm with a correlation coefficient's square (R2) of 0.988. The kinetics of adsorption was defined by second-order kinetics with a rate constant (Kv) of 1.98 g/mg/h. The absorption rate was fast, and the liquid solid equilibrium was accomplished within 180 minutes. The effects of initial solution pH, and reaction temperatures had been estimated, showing that the adsorption was enhanced gradually by increasing pH value.

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