scholarly journals Enhanced Performance of Natural Polymer Coagulants For Dye Removal From Wastewater: Coagulation Kinetics, And Mathematical Modelling Approach

2021 ◽  
Author(s):  
Ifeoma Amaoge Obiora-Okafo ◽  
Okechukwu Dominic Onukwuli ◽  
Chinenye Adaobi Igwegbe ◽  
Chijioke Elijah Onu ◽  
Monday Omotioma
Keyword(s):  
Dye Removal ◽  
Proximate Analysis ◽  
Order Model ◽  
Treatment Processes ◽  
Controlling Mechanism ◽  
Pseudo Second Order ◽  
Coagulation Kinetics ◽  
Detailed Kinetics ◽  
Independent Parameters ◽  
Modelling Approach

Abstract This study explores the potentials of Brachystegia eurycoma coagulant (BEC) and Vigna subterranean coagulant (VSC) as natural organic polymers (NOPs) for the decolourisation of Crystal Ponceau 6R (AR 44) in wastewater. Materials characterisation studies were done on the precursors. Detailed kinetics study was employed. The decolourisation procedures were evalu­ated through time-dependent reduction in the concentration of particles, with the variation of the independent parameters. The proximate analysis showed protein contents of 19.77% and 18.15% for BEC and VSC, respectively. The functional test shows the presence of –OH, N–H, and C=H. Surface morphological study reveals that some rough surfaces, different pores sizes, and compact-net structures were evidenced. The order of removal efficiency was VSC > BEC with an optimum of 88.8% and 73.3%, respectively. The values of K and α obtained for BEC and VSC were 6.38 x 10-4 Lmg-1min-1, 1.8 and 4.03 x 10-3 L/mg-1min-1, 1.9, respectively. The coagulation time, Tag of 31.35 and 26.96 min for BEC and VSC respectively disclosed a quick coagulation. The coagulation-flocculation kinetics demonstrated that the process conforms to the pseudo-second-order model with R2 >0.997, suggesting that the rate-controlling mechanism is governed by chemisorption. The experimental data were well predicted by the cross-validation test, with percentage mean relative deviation modulus (M%) of 3.26 and 2.54 for BEC and VSC, respectively. These coagulants have added meaningful progress in wastewater treatment by coagulation-flocculation while displaying significant adsorption features. Likewise, the usage of kinetics studies and particle behaviour modelling should be a prerequisite in water treatment processes.

scholarly journals Removal of Crystal Violet Dye from Aqueous Solutions onto Date Palm Fiber by Adsorption Technique

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Mashael Alshabanat ◽  
Ghadah Alsenani ◽  
Rasmiah Almufarij
Keyword(s):  
Crystal Violet ◽  
Date Palm ◽  
Dye Removal ◽  
Adsorption Process ◽  
Maximum Adsorption Capacity ◽  
Order Model ◽  
Date Palm Fibers ◽  
Crystal Violet Dye ◽  
Pseudo Second Order ◽  
Influence Of Ph

The adsorption of crystal violet (CV) onto date palm fibers (DPFs) was examined in aqueous solution at 25°C. The experimental maximum adsorption capacity value was0.66×10−6. Langmuir, Freundlich, Elovich and Temkin models were applied to describe the equilibrium isotherms. The influence of pH and temperature on dye removal was evaluated. The percentage removal of CV dye by adsorption onto DPF at different pH and temperatures showed that these factors play a role in the adsorption process. Thermodynamic analysis was performed, and the Gibbs free energyΔGο, enthalpy changeΔHο, and entropyΔSοwere calculated. The negative values ofΔGοindicate spontaneous adsorption. The negative value ofΔHοindicates that the interaction between CV and DPF is exothermic, and the positive value ofΔSοindicates good affinity between DPF and CV. The kinetic data were fitted to a pseudo-second-order model.

scholarly journals Highly Effective Covalently Crosslinked Composite Alginate Cryogels for Cationic Dye Removal

Gels ◽  
2021 ◽  
Vol 7 (4) ◽  
pp. 178
Author(s):  
Serap Sezen ◽  
Vijay Kumar Thakur ◽  
Mehmet Murat Ozmen
Keyword(s):  
Adsorption Capacity ◽  
Dye Removal ◽  
Low Cost ◽  
Dye Adsorption ◽  
Maximum Adsorption Capacity ◽  
High Porosity ◽  
Order Model ◽  
Removal Capacity ◽  
Pseudo Second Order ◽  
The One

Currently, macroporous hydrogels have been receiving attention in wastewater treatment due to their unique structures. As a natural polymer, alginate is used to remove cationic dyes due to its sustainable features such as abundance, low cost, processability, and being environmentally friendly. Herein, alginate/montmorillonite composite macroporous hydrogels (cryogels) with high porosity, mechanical elasticity, and high adsorption yield for methylene blue (MB) were generated by the one-step cryogelation technique. These cryogels were synthesized by adding montmorillonite into gel precursor, followed by chemical cross-linking employing carbodiimide chemistry in a frozen state. The as-prepared adsorbents were analyzed by FT-IR, SEM, gel fraction, swelling, uniaxial compression, and MB adsorption tests. The results indicated that alginate/montmorillonite cryogels exhibited high gelation yield (up to 80%), colossal water uptake capacity, elasticity, and effective dye adsorption capacity (93.7%). Maximum adsorption capacity against MB was 559.94 mg g−1 by linear regression of Langmuir model onto experimental data. The Pseudo-Second-Order model was fitted better onto kinetic data compared to the Pseudo-First-Order model. Improved porosity and mechanical elasticity yielding enhanced dye removal capacity make them highly potential alternative adsorbents compared to available alginate/montmorillonite materials for MB removal.

scholarly journals Kinetic and equilibrium studies on adsorption of Reactive Blue 19 dye from aqueous solutions by nanohydroxyapatite adsorbent

2016 ◽  
Vol 42 (2) ◽  
pp. 3-11 ◽  
Author(s):  
Gabriela Ciobanu ◽  
Simona Barna ◽  
Maria Harja
Keyword(s):  
Dye Removal ◽  
Dye Adsorption ◽  
Kinetic Studies ◽  
Solution Concentration ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Order Model ◽  
Equilibrium Studies ◽  
Reactive Blue 19 ◽  
Pseudo Second Order

AbstractIn the present study the adsorption of Reactive Blue 19 dye on the hydroxyapatite (HAp) nanopowders was investigated. The batch adsorption experiments were performed by monitoring the adsorbent dosage, contact time, dye solution concentration, pH and temperature. At pH 3 and 20°C, high dye removal rates of about 95.58% and 86.95% for the uncalcined and calcined nanohydroxyapatites, respectively, were obtained. The kinetic studies indicated the dye adsorption onto nanohydroxyapatite samples to follow a pseudo-second order model. The Langmuir isotherm was found to be the best to represent the equilibrium with experimental data. The maximum adsorption capacity of uncalcined and calcined nanohydroxyapatite samples has been found to be 90.09 mg/g and 74.97 mg/g, respectively.

Adsorption of Cu(II) onto Cross-Linked Chitosan Coated Bentonite Beads: Kinetic and Isotherm Studies

2017 ◽  
Vol 753 ◽  
pp. 243-248 ◽  
Author(s):  
Noorul Farhana Md Ariff ◽  
Megat Ahmad Kamal Megat Hanafiah ◽  
Wan Saime Wan Ngah
Keyword(s):  
Experimental Data ◽  
Order Model ◽  
Isotherm Study ◽  
Controlling Mechanism ◽  
Monolayer Adsorption ◽  
Different Temperatures ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order ◽  
As Adsorption ◽  
Fast Removal

In this study, cross-linked chitosan coated bentonite (CCB) beads were prepared as a potential adsorbent to adsorb Cu(II) from aqueous solution. As adsorption capacity was affected by several conditions such as initial Cu(II) concentrations, stirring period and temperature, these parameters were important to be investigated. Three different concentrations of Cu(II) were used in the kinetic study, which were 10, 25 and 50 mg/L. The experimental data was found fitted well with the pseudo-second-order model, an indication that chemisorption was the rate controlling mechanism. Isotherm study was done at different temperatures with concentration of Cu(II) was varied from 10 to 200 mg/L. The maximum monolayer adsorption of Cu(II) on CCB beads based on Langmuir isotherm model at 300, 310 and 320 K were 114.94, 119.05 and 77.52 mg/g, respectively. Therefore, adsorption of Cu(II) was preferred at lower temperatures. This work proved CCB beads as an effective adsorbent for fast removal of Cu(II) from wastewater solutions.

scholarly journals Removal of textile dye Remazol Brilliant Blue Reactive (RBBR) using fibers of Citrullus lanatus (watermelon) and Cocos nucifera (green coconut) as adsorbent material

2019 ◽  
Vol 23 ◽  
pp. 5
Author(s):  
Melissa Dominique de Sousa Krueger ◽  
Ana Carolina Volkmann ◽  
Karine Thaise Rainert
Keyword(s):  
Dye Removal ◽  
Citrullus Lanatus ◽  
Cocos Nucifera ◽  
Freundlich Isotherm ◽  
Brilliant Blue ◽  
Textile Dye ◽  
Order Model ◽  
Independent Variables ◽  
Equilibrium Study ◽  
Pseudo Second Order

The accumulation of agro-industrial waste causes major environmental problems since most of these wastes are disposed of improperly. Among them, there are the watermelon (Citrullus lanatus) and the green coconut (Cocos nucifera), fruits of resistant and fibrous peels which are discarded in landfills because they are not widely used. Thus, the adsorption capacity of the Remazol Brilliant Blue Reactive (RBBR) dye was investigated using green coconut and watermelon residues as adsorbents. The combined effects of two independent variables (pH and adsorbent mass) were evaluated using the response surface methodology. Under optimal conditions of acid pH and adsorbent mass of 1 g, the dye removal efficiency reached values above 80% for both residues. The adsorption kinetics was described by the pseudo-second order model, while the equilibrium study was represented by the Freundlich isotherm for the watermelon residue and the Langmuir model for the green coconut. The results show that the agroindustrial residues of watermelon and green coconut could be effectively used to remove dye remazol brilliant blue reactive.

scholarly journals Preparation of Palm Oil Industry’s Biomass-Based Graphene Composite for the Adsorptive Removal of Methylene Blue

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Yeit Haan Teow ◽  
Wan Nur Athirah Wan Mohammad Hamdan ◽  
Abdul Wahab Mohammad
Keyword(s):  
Methylene Blue ◽  
Dye Removal ◽  
Base Material ◽  
Cost Effective ◽  
Order Model ◽  
Freundlich Model ◽  
Column Study ◽  
Equilibrium Study ◽  
Pseudo Second Order ◽  
Shell Composite

The ability of POME-based graphene shell composite (P-GSC), an adsorbent generated from oil palm wastes abundantly available in Malaysia such as POME and PKS, was examined in removing methylene blue (MB) dye by adsorption. Adsorption experiments, involving a batch column study and a batch equilibrium study, were conducted to investigate the efficiency of synthesized P-GSC from PKS as a base material in the removal of MB dye. The batch column study demonstrated that small-sized synthesized P-GSC from PKS as a base material could remove up to 98.5% for concentration. Therefore, the following batch equilibrium study was carried out on small-sized P-GSC only. Adsorption isotherms and kinetic isotherms were studied, from which the experimental data showed that the adsorption exhibited a good fit with the Freundlich model ( R 2 = 0.8923 ) and followed the pseudo-second order model ( R 2 > 0.98 ). FESEM, XPS, and XRD morphological and elemental analysis indicated the successful graphinization of POME on the P-GSC surface. The concept of deploying POME as the carbonaceous source to produce P-GSC, and then, deploying the resultant P-GSC as the adsorbent for MB dye removal has presented promising practical potential. Such cost-effective and environmentally friendly reuse of waste materials is envisioned to promote a ‘zero-waste industry.’

scholarly journals Purification of waste water from cationic dye using SPGMA polymer: Isotherm and Kinetic study

2020 ◽  
Keyword(s):  
Waste Water ◽  
Dye Removal ◽  
Solution Temperature ◽  
Order Model ◽  
First Order ◽  
Sorbent Material ◽  
Maximum Value ◽  
Adsorption Data ◽  
Pseudo Second Order ◽  
The Common

<p>One of the known methods for dye removing from waste water is using sorbent material for fine removal of dye .The nano- cation exchanger Sulphonated poly glycidyl methacrylate (SPGMA polymer) was used as sorbent material for removing one of the common cationic dyes. SPGMA polymer was prepared and characterized to ensure its surface ability to sorb dye. Percentage removal of Methylene Blue using SPGMA polymer was studied by changing different parameters as sorbent amount, stirring speed, pH and solution temperature. The maximum value for dye removal was about 98%. Adsorption data from experimental work shows that the results fit the pseudo first order model for all parameters studied except for pH study fits pseudo second order. Also sorption mechanism for SPGMA polymer was studied for different dye concentration.</p>

scholarly journals Removal of acidic Yellow Dye of wastewater by Moringa Peregrina

2020 ◽  
Author(s):  
negar saraei ◽  
Mostafa Tizghadam Ghazani
Keyword(s):  
Dye Removal ◽  
Adsorption Process ◽  
Test Results ◽  
Optimal Model ◽  
Order Model ◽  
Environment Friendly ◽  
Pseudo Second Order ◽  
Moringa Peregrina ◽  
Colored Wastewater ◽  
Complex Parts

Abstract Industrial textile treatment is one of the most important and complex parts of wastewater treatment. Absorption is considered a desirable method in separating pollutants and dyes from water. In this study, the effectiveness of Moringa Peregrina seeds as a natural, non-toxic, and environment-friendly adsorbent in the treatment of colored wastewater has been investigated. First, the isotherm model and absorption kinetics were investigated, and then influential variables such as major and minor factors in the absorption process were identified. During the experiment, the amount of dye removal efficiency was measured by a spectrophotometer. Optimization of three important factors including color concentration, pH, and adsorbent dosage was done using the design of the composite central method, the response surface in the Design-Expert software. The optimal model for describing the adsorption process, the Freundlich and the pseudo-second-order model are obtained as a result and the adsorption capacity of moringa peregrina is 22.85 mg / g. In the end, code 19 acidic yellow dye with a concentration of 250 mg/L, pH = 8, and adsorbent in the amount of 0.875 g was purified to 80% of an aqueous solution. The results were obtained under constant conditions with a mixing speed of 200 rpm and a duration of 60 minutes with a reliability of 0.93. According to the test results, on average, Moringa Peregrina is effective in removing pigments from aqueous solutions under the mentioned conditions.

scholarly journals Husk of Agarwood Fruit-Based Hydrogel Beads for Adsorption of Cationic and Anionic Dyes in Aqueous Solutions

Molecules ◽  
2021 ◽  
Vol 26 (5) ◽  
pp. 1437
Author(s):  
Chih Ming Ma ◽  
Bo-Yuan Yang ◽  
Gui-Bing Hong
Keyword(s):  
Aqueous Solutions ◽  
Selective Adsorption ◽  
Order Model ◽  
Anionic Dyes ◽  
Adsorption Selectivity ◽  
Hydrogel Beads ◽  
Batch System ◽  
Initial Ph ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order

Hydrogel beads based on the husk of agarwood fruit (HAF)/sodium alginate (SA), and based on the HAF/chitosan (CS) were developed for the removal of the dyes, crystal violet (CV) and reactive blue 4 (RB4), in aqueous solutions, respectively. The effects of the initial pH (2–10) of the dye solution, the adsorbent dosage (0.5–3.5 g/L), and contact time (0–540 min) were investigated in a batch system. The dynamic adsorption behavior of CV and RB4 can be represented well by the pseudo-second-order model and pseudo-first-order model, respectively. In addition, the adsorption isotherm data can be explained by the Langmuir isotherm model. Both hydrogel beads have acceptable adsorption selectivity and reusability for the study of selective adsorption and regeneration. Based on the effectiveness, selectivity, and reusability of these hydrogel beads, they can be treated as potential adsorbents for the removal of dyes in aqueous solutions.

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