Study of the Digestate as an Innovative and Low-Cost Adsorbent for the Removal of Dyes in Wastewater

Digestate, as an urban solid waste, was considered as an innovative adsorbent for colorant polluted wastewater. Batch adsorption experiments were carried out using digestate as an adsorbent material to remove various dyes belonging to different categories. The removal rate and adsorption capacity of dyes were evaluated and the dose of digestate, contact time, and initial dye concentration were studied. The maximum removal rate was approximately 96% for Methylene Blue. The equilibrium time for the Methylene Blue was 4 h, while for other dyes, a longer contact time was required to reach the equilibrium. The suspicion of colloidal matter release into the solution from solid fraction of the digestate led to the investigation of the consequence of a washing step of the digestate adsorbent upstream the adsorption experiment. Washed and not washed adsorbents were tested and the differences between them in terms of dye removal were compared. Moreover, experimental data were fitted by pseudo-first order, pseudo-second order, and intra-partial diffusion kinetic models as well as Langmuir, Freundlich, and Sips isotherm models. The results from fitted models showed that the adsorption of various dyes onto the digestate was mostly well fitted by the Langmuir isotherm and pseudo-second-order kinetic model.

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The Equilibrium, Kinetics, and Thermodynamics Studies of the Sorption of Methylene Blue from Aqueous Solution Using Pulverized Raw Macadamia Nut Shells

Journal of Analytical Methods in Chemistry ◽

10.1155/2020/8840666 ◽

2020 ◽

Vol 2020 ◽

pp. 1-10

Author(s):

Joshua N. Edokpayi ◽

Samson O. Alayande ◽

Ahmed Adetoro ◽

John O. Odiyo

Keyword(s):

Aqueous Solution ◽

Methylene Blue ◽

Surface Area ◽

Low Cost ◽

Aqueous Media ◽

Group Analysis ◽

Second Order ◽

Isotherm Models ◽

Macadamia Nut ◽

Pseudo Second Order

In this study, the potential for pulverized raw macadamia nut shell (MNS) for the sequestration of methylene blue from aqueous media was assessed. The sorbent was characterized using scanning electron microscopy for surface morphology, functional group analysis was performed with a Fourier-transform infrared spectrometer (FT-IR), and Brunauer–Emmett–Teller (BET) isotherm was used for surface area elucidation. The effects of contact time, sorbent dosage, particle size, pH, and change in a solution matrix were studied. Equilibrium data were fitted using Temkin, Langmuir, and Freundlich adsorption isotherm models. The sorption kinetics was studied using the Lagergren pseudo-first-order, pseudo-second-order, Elovich, and intraparticle diffusion models. The feasibility of the study was established from the thermodynamic studies. A surface area of 2.763 m2/g was obtained. The equilibrium and kinetics of sorption was best described by the Langmuir and the pseudo-second-order models, respectively. The sorption process was spontaneous (−ΔG0=28.72−31.77 kJ/mol) and endothermic in nature (ΔH0=17.45 kJ/mol). The positive value of ΔS0 (0.15 kJ/molK) implies increased randomness of the sorbate molecules at the surface of the sorbent. This study presents sustainable management of wastewater using MNS as a potential low-cost sorbent for dye decontamination from aqueous solution.

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Biosorption of Colour, Copper and Zinc in Textile Wastewater using Carbonized Orange Peels

LAUTECH Journal of Civil and Environmental Studies ◽

10.36108/laujoces/1202.60.0280 ◽

2021 ◽

Vol 6 (2) ◽

Author(s):

P. H. Kumaraiah

Keyword(s):

Adsorption Isotherms ◽

Contact Time ◽

Textile Wastewater ◽

Second Order ◽

Batch Adsorption ◽

Order Kinetic ◽

Copper Adsorption ◽

Orange Peels ◽

Copper And Zinc ◽

Pseudo Second Order

Recently, low-cost adsorbents from sustainable sources are required for the remediation of textile wastewater. Carbonized Orange Peels (COPs) was utilized in remediating colour, Zinc and Copper from textile wastewater. The initial and final pH, colour and trace metals’ composition of the wastewater used were determined for the adsorption processes. Batch adsorption experiment was carried out on COPs and textile wastewater’s mixture to find effects of COP’s dosage, agitation, pH and contact time on the colour, Zinc and Copper’s removal from the wastewater. The adsorption isotherms and kinetic studies were conducted using Langmuir, Freundlich, Pseudo-first-order and Pseudo-second-order models. Findings established that the optimum removal of colour, Zinc and Copper respectively occurred at an adsorbent dosage of 2.5, 0.5 and 3.0 g/100ml, pH of 10, 4 and 2, rotating speed of 100, 250 and 250 rpm, contact time of 40, 60, and 40 mins. The adsorption isotherms revealed only copper adsorption as optimum and well fitted Langmuir isotherm. Pseudo-second-order kinetic model best suited adsorption data of the colour and metal ions with high correlation coefficient (R2) exceeding 0.95. Conclusively, COPs is effective in remediating the colour, copper and zinc from the wastewater, thus, recommended as suitable adsorbent for treatment of textile wastewater

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Removal of Direct Yellow 50 From Aqueous Solutions Using Chitosan-ISO-Vanillin Derivatives Chelating Polymers

10.21203/rs.3.rs-129329/v1 ◽

2020 ◽

Author(s):

Eman Alabbad

Keyword(s):

Contact Time ◽

Removal Rate ◽

Second Order ◽

Rate Equations ◽

Order Kinetic ◽

Solution Ph ◽

Modified Chitosan ◽

Intra Particle Diffusion ◽

Pseudo Second Order ◽

Living Organisms

Abstract Background Water contamination has increasingly become a significant problem affecting the welfare of living organisms perceived to be aquatic beneficiaries. The nature and origin of the contaminant always determines the purification techniques. The most common contaminants in wastewater include organic compounds such as dyes that must be eliminated to enhance water purity and safety.Result The results indicate that the removal of DY50 by the modified chitosan was affected by the solution pH, sorbent dosage, initial DY50 concentration, contact time, and temperature. The experimental data were fitted to the Langmuir, Freundlich, and Temkin isotherms, and Langmuir isotherm showed the best fit. The kinetic data were fitted to the pseudo-first-order and pseudo-second-order rate equations. The removal rate was 97.9% by chemisorption components after the three hours at about 0.05 g of sorbent dose and 100 ppm of the Direct Yellow 50 dye initial concentration. The adsorption behavior of the modified chitosan for the removal of DY50 was well-described using the pseudo-second-order kinetic model, Intraparticle diffusion analysis was also conducted. The thermodynamic properties such as free energy (∆G), enthalpy (∆H), and entropy (∆S), in addition to the intra-particle diffusion rate were similarly defined.Conclusion The pH, initial DY50 concentration, sorbent dosage, adsorption temperature, and contact time had a significant effect on the adsorption of DY50 by chitosan-iso-vanillin.

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Prediction of adsorption efficiency for the removal malachite green and acid blue 161 dyes by marble sludge dust using ANN

Global NEST Journal ◽

10.30955/gnj.001366 ◽

2014 ◽

Vol 16 (4) ◽

pp. 676-689 ◽

Cited By ~ 6

Keyword(s):

Experimental Data ◽

Malachite Green ◽

Second Order ◽

Isotherm Models ◽

Batch Adsorption ◽

Order Kinetic ◽

Ann Model ◽

Marble Dust ◽

Pseudo Second Order ◽

Acid Blue

<div> In the present study, batch adsorption studies were performed for the removal of malachite green and acid blue 161 dyes from aqueous solutions by varying parameters such as contact time, waste marble dust amount, initial dye concentration and temperature. The equilibrium adsorption data were analyzed by Langmuir, Freundlich and Temkin adsorption isotherm models. The Langmuir and Freundlich adsorption models agree well with experimental data. The pseudo-second order, intraparticle intraparticle diffusion and Elovich kinetic models were applied to the experimental data in order to describe the removal mechanism of dye ions by waste marble dust. The pseudo-second order kinetic was the best fit kinetic model for the experimental data. Thermodynamics parameters such as ΔG, ΔH and ΔS were also calculated for the adsorption processes. The experimental data were used to construct an artificial neural network (ANN) model to predict removal of malachite green and acid blue 161 dyes by waste marble dust. A three-layer ANN, an input layer with four neurons, a hidden layer with 12 neurons, and an output layer with one neuron is constructed. Different training algorithms were tested on the model to obtain the proper weights and bias values for ANN model. The results show that waste marble dust is an efficient sorbent for malachite green dye and ANN network, which is easy to implement and is able to model the batch experimental system. </div>

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Removal of Basic Orange 2 dye and Ni2+ from aqueous solutions using alkaline-modified nanoclay

Water Science & Technology ◽

10.2166/wst.2021.121 ◽

2021 ◽

Author(s):

Armin Geroeeyan ◽

Ali Niazi ◽

Elaheh Konoz

Keyword(s):

Experimental Data ◽

High Efficiency ◽

Adsorption Process ◽

Kinetic Equations ◽

Dye Adsorption ◽

Second Order ◽

Isotherm Models ◽

Order Kinetic ◽

Diffusion Kinetic ◽

Pseudo Second Order

Abstract In the present research, the removal of Basic Orange 2 (BO2) dye using alkaline-modified clay nanoparticles was studied. To characterize the adsorbent, XRD, FTIR, FESEM, EDX, BET and BJH analyses were performed. The effect of the variables influencing the dye adsorption process such as adsorbent dose, contact time, pH, stirring rate, temperature, and initial dye concentration was investigated. Furthermore, the high efficiency of Ni2+ removal indicated that it is possible to remove both dye and metal cation under the same optimum conditions. The experimental data were analyzed by Langmuir and Freundlich isotherm models. Fitting the experimental data to Langmuir isotherm indicated that the monolayer adsorption of dye occurred at homogeneous sites. Experimental data were also analyzed with pseudo-first-order, pseudo-second-order, and intra-particle diffusion kinetic equations for kinetic modeling of the dye removal process. The adsorption results indicated that the process follows a pseudo-second-order kinetic model. The thermodynamic parameters of the dye adsorption process such as enthalpy, entropy, and Gibbs free energy changes were calculated and revealed that the adsorption process was spontaneous and endothermic in nature. The results presented the high potential of the modified nanoclay as a cost-effective adsorbent for the removal of BO2 dye and Ni2+ from aqueous medium.

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Preparation of Modified nano-SiO2 by Bismuth and Iron as a novel Remover of Methylene Blue from Water Solution

Journal of the Mexican Chemical Society ◽

10.29356/jmcs.v61i3.351 ◽

2017 ◽

Vol 61 (3) ◽

Cited By ~ 8

Author(s):

Farhad Salimi ◽

Keivan Tahmasobi ◽

Changiz Karami ◽

Alireza Jahangiri

Keyword(s):

Methylene Blue ◽

Contact Time ◽

Water Solution ◽

Freundlich Isotherm ◽

Second Order ◽

Order Kinetic ◽

Freundlich Isotherms ◽

Pseudo Second Order ◽

Adsorption Treatment ◽

Dyes Adsorption

Modified nano-silica with Bismuth and Iron adsorbent was synthesized to be used as an effective adsorbent material for methylene blue (MB) removal from water solution. The prepared samples were characterized using SEM, FTIR, XRD and TEM. The effect of experimental parameters such as pH, contact time and initial concentration on adsorption treatment were studied. Results indicated that the optimum conditions for maximum adsorption of 20 mg/L MB were: contact time of 20 minutes, pH= 5-6 and 8 gr/L adsorbent, the remaining MB in solution was 1.75%. Langmuir and Freundlich isotherms were employed to model the experimental results and the Freundlich isotherm was the best-fitting models for the experiment results. The kinetic data were also analyzed through pseudo-first-order and pseudo-second-order models. The pseudo-second-order kinetic model well depicted the kinetics of dyes adsorption on adsorbent.

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Mangosteen Peel-Alginate Biocomposite Beads An Efficient and Sustainable Adsorbent For Decontamination of Methylene Blue

10.21203/rs.3.rs-1038092/v1 ◽

2021 ◽

Author(s):

Asma Nasrullah ◽

Amir Sada Khan ◽

A. H. Bhat ◽

Taghreed M. Fagieh ◽

Ersaa M. Bakhsh ◽

...

Keyword(s):

Methylene Blue ◽

Low Cost ◽

Cost Effective ◽

Alginate Beads ◽

Basic Medium ◽

Batch Adsorption ◽

Order Kinetic ◽

Removal Capacity ◽

Pseudo Second Order ◽

Best Fit

Abstract This study examines mangosteen peels waste and alginate beads (MPAB) as an efficient, sustainable and low-cost adsorbent for removal of methylene blue (MB) cationic dye from aqueous solution in a batch adsorption system. Surface functional groups, surface morphology, surface properties, and thermal stability of MBAB were analyzed using various instrumental techniques such as FTIR, FESEM, BET and TGA techniques. MPAB adsorption efficiency for MB was investigated through variation of dosage (0.01- 0.08g), pH (2- 10), contact time (60- 1320 min), MB concentration (20- 100 mg/L) and temperature (298- 333K). MPAB showed maximum removal capacity of 373 mg/g at 25 oC in basic medium. Kinetic and isotherm studies showed that pseudo second order kinetic models and both Freundlich and Langmuir isotherms best fit the experimental data. The findings revealed that novel MPAB has the potential to be a cost-effective adsorbent for removal of textile dyes.

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Kinetics Studies of Metallic Ions Adsorption by Immobilised Chitosan

Science Letters ◽

10.24191/sl.v16i1.15932 ◽

2022 ◽

Vol 16 (1) ◽

pp. 137

Author(s):

Thanabalan Pitchay ◽

Ali H. Jawad ◽

Ili Syazana Johari ◽

Sumiyyah Sabar

Keyword(s):

Liquid Film ◽

Kinetic Models ◽

Active Sites ◽

Second Order ◽

Batch Adsorption ◽

Order Kinetic ◽

Metallic Ions ◽

Diffusion Kinetic ◽

Film Diffusion ◽

Pseudo Second Order

Immobilised chitosan on glass plates was used as an adsorbent for metallic ions from aqueous solutions in a batch adsorption system. Experiments were carried out as a function of contact time and initial metallic ions concentration. The adsorption efficiency increased with increasing initial metallic ions concentration (5 – 20 mg L-1) and the observed trend was: Ag2+ > Cu2+ > Ni2+ > Fe3+ > Cd2+ > Zn2+. The experimental data were fitted to pseudo-first, pseudo-second-order, intra-particle, and liquid film diffusion kinetic models. The applicability of the pseudo-second-order kinetic model indicated that the adsorption behaviour was ascribed by chemisorption. Further data analysis by the diffusion kinetic models suggested that the metallic ions adsorption was controlled by more than one step; adsorption at the active sites, intra-particle, and liquid film diffusion.

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Comparison of novel Ziziphus lotus adsorbent and industrial carbon on methylene blue removal from aqueous solutions

Water Science & Technology ◽

10.2166/wst.2018.481 ◽

2018 ◽

Vol 78 (10) ◽

pp. 2055-2063

Author(s):

Asmaa Msaad ◽

Mounir Belbahloul ◽

Samir El Hajjaji ◽

Abdeljalil Zouhri

Keyword(s):

Methylene Blue ◽

Activated Carbon ◽

Aqueous Solutions ◽

Low Cost ◽

Sorption Process ◽

Second Order ◽

Order Kinetic ◽

Industrial Carbon ◽

Freundlich Isotherms ◽

Pseudo Second Order

Abstract In this work, the use of a novel low-cost adsorbent derived from Ziziphus lotus (ZL) and industrial carbon (IC) has been successfully applied to the removal of methylene blue (MB) from aqueous solutions. The efficiency of this material was studied through Lagergren pseudo-first-order and pseudo-second-order kinetic models. The process for the novel activated carbon and the IC were best represented by the pseudo-second-order rate model. Langmuir and Freundlich isotherms were used to describe the sorption equilibrium data. The Langmuir model turned out to be the most adequate and maximum capacities were measured to be 833.33 and 142.85 mg.g−1 for ZL activated carbon and IC from Sigma Aldrich, respectively. The thermodynamic study revealed that the sorption process is spontaneous and endothermic for the two adsorbents. To explain the effectiveness of MB removal, ZL activated carbon was characterized by scanning electron microscopy, Brunauer–Emmett–Teller surface area, X-ray diffraction and Fourier transform infrared spectroscopy.

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Comparative studies on adsorptive removal of heavy metal ions by biosorbent, bio-char and activated carbon obtained from low cost agro-residue

Water Science & Technology ◽

10.2166/wst.2015.504 ◽

2015 ◽

Vol 73 (2) ◽

pp. 423-436 ◽

Cited By ~ 17

Author(s):

Çisem Kırbıyık ◽

Ayşe Eren Pütün ◽

Ersan Pütün

Keyword(s):

Activated Carbon ◽

Metal Ion ◽

Low Cost ◽

Chemical Activation ◽

Second Order ◽

Isotherm Models ◽

Standard Entropy ◽

Order Kinetic ◽

Solution Ph ◽

Pseudo Second Order

In this study, Fe(III) and Cr(III) metal ion adsorption processes were carried out with three adsorbents in batch experiments and their adsorption performance was compared. These adsorbents were sesame stalk without pretreatment, bio-char derived from thermal decomposition of biomass, and activated carbon which was obtained from chemical activation of biomass. Scanning electron microscopy and Fourier transform–infrared techniques were used for characterization of adsorbents. The optimum conditions for the adsorption process were obtained by observing the influences of solution pH, adsorbent dosage, initial solution concentration, contact time and temperature. The optimum adsorption efficiencies were determined at pH 2.8 and pH 4.0 for Fe(III) and Cr(III) metal ion solutions, respectively. The experimental data were modelled by different isotherm models and the equilibriums were well described by the Langmuir adsorption isotherm model. The pseudo-first-order, pseudo-second-order kinetic, intra-particle diffusion and Elovich models were applied to analyze the kinetic data and to evaluate rate constants. The pseudo-second-order kinetic model gave a better fit than the others. The thermodynamic parameters, such as Gibbs free energy change ΔG°, standard enthalpy change ΔH° and standard entropy change ΔS° were evaluated. The thermodynamic study showed the adsorption was a spontaneous endothermic process.

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