The Adsorption of Methylene Blue by an Amphiphilic Block Co-Poly(Arylene Ether Nitrile) Microsphere-Based Adsorbent: Kinetic, Isotherm, Thermodynamic and Mechanistic Studies

Dye pollution is a serious problem in modern society. We desired to develop an efficient adsorbent for the decontamination of discharged dyes. In this work, the polymeric microspheres derived from a kind of amphiphilic block of co-poly(arylene ether nitrile) (B-b-S-P) were prepared on the basis of “oil-in-water” (O/W) microemulsion method. The B-b-S-P microspheres were found competent to remove the cationic dye, methylene blue (MB); and various influential factors, such as contact time, initial concentration, solution pH and temperature were investigated. Results indicated that the maximum adsorption capacity of B-b-S-P microspheres for MB was 119.84 mg/g at 25 °C in neutral conditions. Adsorption kinetics and isotherm dates were well fitted to a pseudo-second-order kinetic model and the Langmuir isotherm model, and thermodynamic parameters implied that the adsorption process was endothermic. The B-b-S-P microspheres also exhibited a highly selective adsorption for cationic dye MB, even in the presence of anionic dye methyl orange (MO). In addition, the possible adsorption mechanism was studied, suggesting that the electrostatic interaction and π–π interaction could be the main force in the adsorption process.

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Efficient and Selective Adsorption of Gold Ions from Wastewater with Polyaniline Modified by Trimethyl Phosphate: Adsorption Mechanism and Application

Polymers ◽

10.3390/polym11040652 ◽

2019 ◽

Vol 11 (4) ◽

pp. 652 ◽

Cited By ~ 5

Author(s):

Wang ◽

Zhao ◽

Wang ◽

Zhang ◽

Zhang

Keyword(s):

Adsorption Capacity ◽

Adsorption Process ◽

Selective Adsorption ◽

Interaction Mechanism ◽

Single Layer ◽

Phosphate Adsorption ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Trimethyl Phosphate ◽

Selective Recovery

The selective recovery of gold from wastewater is necessary because it is widely used in various fields. In this study, a new polymeric adsorbent (TP-AFC) was prepared by modifying polyaniline with trimethyl phosphate for the selective recovery of gold from wastewater. Bath experiments were carried out to explore the adsorption capacity and mechanism. The optimum pH of adsorption is 4. The adsorption equilibrium is reached at 840 min. The maximum adsorption capacity is 881 mg/g and the adsorption was a spontaneous endothermic process. The adsorption process fitted well with pseudo second-order kinetic and the Langmuir-models. The single-layer chemisorption governed the adsorption process. In addition, the application in wastewater indicated that the interfering ions had no effect on the adsorption of gold ions. TP-AFC has good selectivity. The interaction mechanism was mainly ion exchange and complexation. In general, TP-AFC was successfully prepared and has an excellent future in practical application.

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Assessment of Urtica as a low-cost adsorbent for methylene blue removal: kinetic, equilibrium, and thermodynamic studies

Chemical Papers ◽

10.1515/chempap-2015-0097 ◽

2015 ◽

Vol 69 (7) ◽

Cited By ~ 5

Author(s):

Mohammad Peydayesh ◽

Mojgan Isanejad ◽

Toraj Mohammadi ◽

Seyed Mohammad Reza Seyed Jafari

Keyword(s):

Methylene Blue ◽

Adsorption Process ◽

Low Cost ◽

Cost Effective ◽

Sem Analysis ◽

Order Kinetic ◽

Solution Ph ◽

Factors Affecting ◽

Order Kinetic Model ◽

Mb Adsorption

AbstractMethylene blue (MB) removal using eco-friendly, cost-effective, and freely available Urtica was investigated. The morphology of the adsorbent surface and the nature of the possible Urtica and MB interactions were examined using SEM analysis and the FTIR technique, respectively. Various factors affecting MB adsorption such as adsorption time, initial MB concentration, temperature, and solution pH were investigated. The adsorption process was analysed using different kinetic models and isotherms. The results showed that the MB adsorption kinetic follows a pseudo-second-order kinetic model and the isotherm data fit the Langmuir isotherm well. Thermodynamic parameters, such as ΔG°, ΔH°, and ΔS°, were also evaluated, and the results indicated that the adsorption process is endothermic and spontaneous in nature. The MB adsorption capacity of Urtica was found to be as high as 101.01 mg g

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Core-Shell Structured Magnetic Carboxymethyl Cellulose-Based Hydrogel Nanosorbents for Effective Adsorption of Methylene Blue from Aqueous Solution

Polymers ◽

10.3390/polym13183054 ◽

2021 ◽

Vol 13 (18) ◽

pp. 3054

Author(s):

Yiming Zhou ◽

Te Li ◽

Juanli Shen ◽

Yu Meng ◽

Shuhua Tong ◽

...

Keyword(s):

Methylene Blue ◽

Aqueous Solutions ◽

Adsorption Capacity ◽

Carboxymethyl Cellulose ◽

Chemical Properties ◽

Polymer Nanocomposite ◽

Core Shell ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Solution Ph

This article reports effective removal of methylene blue (MB) dyes from aqueous solutions using a novel magnetic polymer nanocomposite. The core-shell structured nanosorbents was fabricated via coating Fe3O4 nanoparticles with a layer of hydrogel material, that synthesized by carboxymethyl cellulose cross-linked with poly(acrylic acid-co-acrylamide). Some physico-chemical properties of the nanosorbents were characterized by various testing methods. The nanosorbent could be easily separated from aqueous solutions by an external magnetic field and the mass fraction of outer hydrogel shell was 20.3 wt%. The adsorption performance was investigated as the effects of solution pH, adsorbent content, initial dye concentration, and contact time. The maximum adsorption capacity was obtained at neutral pH of 7 with a sorbent dose of 1.5 g L−1. The experimental data of MB adsorption were fit to Langmuir isotherm model and Pseudo-second-order kinetic model with maximum adsorption of 34.3 mg g−1. XPS technique was applied to study the mechanism of adsorption, electrostatic attraction and physically adsorption may control the adsorption behavior of the composite nanosorbents. In addition, a good reusability of 83.5% MB recovering with adsorption capacity decreasing by 16.5% over five cycles of sorption/desorption was observed.

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Sheet-like Skeleton Carbon Derived from Shaddock Peels with Hierarchically Porous Structures for Ultra-Fast Removal of Methylene Blue

Water ◽

10.3390/w13182554 ◽

2021 ◽

Vol 13 (18) ◽

pp. 2554

Author(s):

Panlong Dong ◽

Hailin Liu ◽

Shengrui Xu ◽

Changpo Chen ◽

Suling Feng ◽

...

Keyword(s):

Methylene Blue ◽

Adsorption Capacity ◽

Surface Area ◽

Adsorption Process ◽

Batch Adsorption ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Initial Concentration ◽

Hierarchically Porous ◽

Column Adsorption

To remove the pollutant methylene blue (MB) from water, a sheet-like skeleton carbon derived from shaddock peels (SPACs) was prepared by NaOH activation followed by a calcination procedure under nitrogen protection in this study. Characterization results demonstrated that the as-prepared SPACs displayed a hierarchically porous structure assembled with a thin sheet-like carbon layer, and the surface area of SPAC-8 (activated by 8 g NaOH) was up to 782.2 m2/g. The as-prepared carbon material presented an ultra-fast and efficient adsorption capacity towards MB due to its macro-mesoporous structure, high surface area, and abundant functional groups. SPAC-8 showed ultrafast and efficient removal capacity for MB dye. Adsorption equilibrium was reached within 1 min with a removal efficiency of 99.6% at an initial concentration of 100 mg/g under batch adsorption model conditions. The maximum adsorption capacity for MB was up to 432.5 mg/g. A pseudo-second-order kinetic model and a Langmuir isotherm model described the adsorption process well, which suggested that adsorption rate depended on chemisorption and the adsorption process was controlled by a monolayer adsorption, respectively. Furthermore, column adsorption experiments showed that 96.58% of MB was removed after passing through a SPAC-8 packed column with a flow rate of 20 mL/min, initial concentration of 50 mg/L, and adsorbent dosage of 5 mg. The as-prepared adsorbent displays potential value in practical applications for dye removal due to its ultrafast and efficient adsorption capacity.

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Thermodynamics, kinetics and isotherm studies on the removal of methylene blue from aqueous solution by calcium alginate

Journal of Water Reuse and Desalination ◽

10.2166/wrd.2015.121 ◽

2015 ◽

Vol 6 (2) ◽

pp. 301-309 ◽

Cited By ~ 1

Author(s):

Jixiang Zhang ◽

Guangxia Zhang ◽

Qiuxiang Zhou ◽

Lailiang Ou

Keyword(s):

Aqueous Solution ◽

Methylene Blue ◽

Calcium Alginate ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Diffusion Kinetic ◽

Solution Ph ◽

Freundlich Isotherms ◽

Wide Ph Range ◽

Intra Particle Diffusion

Calcium alginate (CA) was used as an adsorbent to remove methylene blue (MB) from aqueous solution. The effect of initial dye concentration, contact time, temperature and solution pH on the adsorption of MB onto CA was investigated by batch experiments. The percentage removal of MB decreased with increasing temperature. Comparatively high adsorption capacities were shown over a wide pH range (pH 2–11). More than 93% of MB removal was obtained within 30 min for an initial dye concentration of 1,000 mg/L at an adsorbent dose of 4 g/L. The adsorption equilibrium was investigated by the Langmuir and Freundlich isotherms. The maximum adsorption capacity was 2,355.4 mg/g on the basis of the Langmuir isotherm. Thermodynamic parameters were evaluated, and revealed that the adsorption process was a spontaneous, exothermic and entropy-reduced process. Pseudo-first, pseudo-second and intra-particle diffusion kinetic models were applied to the experimental data, and the results showed that the adsorption was in good agreement with the pseudo-second order kinetic model. Desorption studies implied that CA could be a useful adsorbent for the removal of MB from aqueous solution.

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Optimization, Equilibrium and Kinetic Modeling of Methylene Blue Removal from Aqueous Solutions Using Dry Bean Pods Husks Powder

Materials ◽

10.3390/ma14195673 ◽

2021 ◽

Vol 14 (19) ◽

pp. 5673

Author(s):

Giannin Mosoarca ◽

Simona Popa ◽

Cosmin Vancea ◽

Sorina Boran

Keyword(s):

Methylene Blue ◽

Taguchi Method ◽

Aqueous Solutions ◽

Kinetic Modeling ◽

Adsorption Process ◽

Physical Adsorption ◽

Dye Adsorption ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Dry Bean

In this research, dry bean pods husks (DBPH) were used as an adsorbent material after minimum processing (without chemical substances consumption and without thermal treatment) to remove methylene blue from aqueous solutions. The adsorbent surface characteristics were investigated using SEM and FTIR analysis. For maximum removal efficiency, several parameters that influence the dye adsorption were optimized using the Taguchi method. Equilibrium and kinetic modeling, along with thermodynamic studies, were conducted to elucidate the adsorption mechanism. Taguchi experimental design showed that the factor with the highest influence was the adsorbent dose, with a percent contribution established by the ANOVA analysis of 40.89%. Langmuir isotherm and pseudo-second order kinetic model characterizes the adsorption process. The maximum adsorption capacity, 121.16 (mg g−1), is higher than other similar adsorbents presented in scientific literature. Thermodynamic parameters indicate a spontaneous, favorable and endothermic adsorption process, and their values show that physical adsorption is involved in the process. The obtained results, and the fact that adsorbent material is inexpensive and easily available, indicate that DBPH powder represents an effective absorbent for treating waters containing methylene blue. Additionally, the Taguchi method is very suitable to optimize the process.

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Studies on the Removal of Cadmium Toxic Metal Ions by Natural Clays from Aqueous Solution by Adsorption Process

Journal of Chemistry ◽

10.1155/2021/7873488 ◽

2021 ◽

Vol 2021 ◽

pp. 1-14

Author(s):

Rajaa Bassam ◽

Achraf El hallaoui ◽

Marouane El Alouani ◽

Maissara Jabrane ◽

El Hassan El Khattabi ◽

...

Keyword(s):

Adsorption Capacity ◽

Adsorption Process ◽

Metal Removal ◽

Heavy Metal Removal ◽

Toxic Metal ◽

Ion Concentration ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Solution Ph ◽

Natural Clays

The aim of this study is the valorization of the Moroccan clays (QC-MC and QC-MT) from the Middle Atlas region as adsorbents for the treatment of water contaminated by cadmium Cd (II) ions. The physicochemical properties of natural clays are characterized by ICP-MS, XRD, FTIR, and SEM techniques. The adsorption process is investigated as a function of adsorbent mass, solution pH, contact time, temperature, and initial Cd (II) ion concentration. The kinetic investigation shows that the adsorption equilibrium of Cd (II) ions by both natural clays is reached after 30 min for QC-MT and 45 min for QC-MC and fits well to a pseudo-second-order kinetic model. The isotherm study is best fitted by a Freundlich model, with the maximum adsorption capacity determined by the linear form of the Freundlich isotherm being 4.23 mg/g for QC-MC and 5.85 mg/g for QC-MT at 25°C. The cadmium adsorption process was thermodynamically spontaneous and exothermic. The regeneration process showed that these natural clays had excellent recycling capacity. Characterization of the Moroccan natural clays before and after the adsorption process through FTIR, SEM, XRD, and EDX techniques confirmed the Cd (II) ion adsorption on the surfaces of both natural clay adsorbents. Overall, the high adsorption capacity of both natural clays for Cd (II) ions removal compared to other adsorbents motioned in the literature indicated that these two natural adsorbents are excellent candidates for heavy metal removal from aqueous environments.

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Removal of Methylene Blue from Aqueous Solution by a Novel PAA@Fe-Si Composite Material

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.665.479 ◽

2014 ◽

Vol 665 ◽

pp. 479-482

Author(s):

Chao Shuai ◽

Yun Wen Liao ◽

He Jun Gao ◽

Luan Luan Zhang

Keyword(s):

Aqueous Solution ◽

Methylene Blue ◽

Composite Material ◽

Contact Time ◽

Maximum Adsorption Capacity ◽

Cationic Dye ◽

Solution Ph ◽

Mb Adsorption ◽

Scanning Electron ◽

Better Than

A novel organic-inorganic PAA@Fe-Si composite material was synthesized by acrylic acid and mesoporous iron-incorporated material and used as an efficient and specific adsorbent for the removal of methylene blue (MB), a cationic dye from aqueous solution. The properties of the composite material were characterized by scanning electron microscopy, Fourier transform infrared and thermogravimetric. The effects of initial solution pH, adsorbent dosage, and contact time on MB adsorption and temperature have been investigated. The results showed that the maximum adsorption capacity of PAA@Fe-Si reached 587mg/g at 298 K, which was much better than pure Fe-Si adsorbent.

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Adsorption Properties of Polyethersulfone-Modified Attapulgite Hybrid Microspheres for Bisphenol A and Sulfamethoxazole

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph17020473 ◽

2020 ◽

Vol 17 (2) ◽

pp. 473 ◽

Cited By ~ 2

Author(s):

Jian Yu ◽

Hao Shen ◽

Bin Liu

Keyword(s):

Bisphenol A ◽

Endocrine Disruptors ◽

Thermodynamic Model ◽

Adsorption Process ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Mixed Solution ◽

Solution Ph ◽

Langmuir Adsorption ◽

Modified Attapulgite

In this paper, attapulgite purified by acid heat was employed, and millimeter polyethersulfone-modified attapulgite hybrid microspheres were prepared. The effects of mixed bisphenol A (BPA) and sulfamethoxazole (SMX) solution on the modified attapulgite doping ratio, initial solution pH, adsorbent dosage, contaminant concentration, and temperature were studied. The experimental results showed that BPA and SMX compete in the adsorption process, and the hybrid microspheres preferentially select the BPA molecules (anionic endocrine disruptors) compared to the SMX. The adsorption process in the mixed solution conforms to the quasi-secondary-order kinetic model. The adsorption of BPA and SMX by hybrid microspheres is more consistent with the extended Langmuir adsorption thermodynamic model, and the adsorption of BPA + SMX is more in line with the Langmuir adsorption thermodynamic model. At 25 °C, the maximum adsorption capacity of hybrid microspheres for BPA and SMX was 102.04 and 12.80 μmol·g−1, respectively, and the maximum adsorption of BPA + SMX was 112.36 μmol·g−1. After five regenerations, the removal effect of the hybrid microspheres on the endocrine disruptors remained above 95%.

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Adsorptive removal of direct red 80 and methylene blue from aqueous solution by potato peels: a comparison of anionic and cationic dyes

Water Science & Technology ◽

10.2166/wst.2021.075 ◽

2021 ◽

Author(s):

Khawla Ben Jeddou ◽

Fatma Bouaziz ◽

Fadia Ben Taheur ◽

Oumèma Nouri-Ellouz ◽

Raoudha Ellouz-Ghorbel ◽

...

Keyword(s):

Methylene Blue ◽

Adsorption Process ◽

Fourier Transforms ◽

Freundlich Isotherm ◽

Second Order ◽

Order Kinetic ◽

Solution Ph ◽

Model Calculations ◽

Pseudo Second Order ◽

Potato Peels

Abstract Adsorption of direct red 80 (DR 80) and methylene blue (MB) from aqueous solutions on potato peels (PP) has been compared. The use of peels in decontamination technology is very promising given the near zero-cost for the synthesis of those adsorbents. The selected potato peels were first analyzed by scanning using electron microscopy (SEM) and Fourier transforms infra red spectroscopy (FTIR). Then the adsorption behavior was studied in a batch system. The adsorption process is affected by various parameters such as the solution pH (2–11), the initial concentration of the dye (20, 50, 100, 150 and 200 mg L−1), the adsorbent dose (0.1%–3%), the temperature (303.16 K, 313.16 K, and 323.16 K), agitation (up to 250 rpm), as well as the contact time. Adsorption isotherms of the studied dye on the adsorbent were determined and compared with the Langmiur, Freundlich and Temkin adsorption models. The results show that the data was most similar to the Freundlich isotherm (R2 = 0.99). The maximum adsorption capacities (Qmax) of MB and DR 80 by the PP at temperatures 303.16 K, 313.16 K and 323.16 K were found to be approximately 97.08 mg g−1; 45.87 mg g−1; 61.35 mg g−1 and 27.778 mg g−1; 45.45 mg g−1; and 32.258 mg g−1. The kinetic data was compared to the pseudo-first-order, pseudo-second-order, and intraparticle diffusion models. This revealed that adsorption of methylene blue onto PP abided mostly to the pseudo-second-order kinetic model. Calculations of various thermodynamic parameters such as enthalpy change (ΔH), entropy change (ΔS), and free energy change (ΔG) display the endothermic and spontaneous nature of the adsorption process.

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