The Optimization Parameters of Activated Biochar Derived From Pine Pyrolysis: Application in Methylene Blue Adsorption

Abstract To understand the interaction mechanism between adsorbent and adsorbate, activated biochar, prepared from pine sawdust using CO2 and H2O as activator, was employed to adsorb methylene blue in printing and dyeing pollutants. The pore structure, carbon structure of the aromatic ring system, and functional groups were investigated though SEM, nitrogen adsorption/desorption device (BET), Raman, and XPS characterization, and the adsorption kinetics and possible adsorption mechanism were also studied. The results showed that the activated biochar prepared by CO2 activation had more specific surface area, pore structure, and surface oxygen-containing functional groups than that prepared by H2O, which was more conductive to improving its adsorption capacity. The electrostatic interaction between the surface oxygen-containing functional groups in the adsorbents and the π-π interaction formed in the aromatic rings enhanced the adsorption capacity of activated biochar to methylene blue. The adsorption process of methylene blue by activated biochar was spontaneous, and it conformed to the pseudo-second-order kinetic characteristics and Langmuir adsorption isotherm equation. It was a monolayer adsorption and the maximum adsorption capacity was about 160 mg/g. Activated biochar as an adsorbent for wastewater treatment has promising application and development prospects.

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Sorptive removal of phenanthrene from aqueous solutions using magnetic and non-magnetic rice husk-derived biochars

Royal Society Open Science ◽

10.1098/rsos.172382 ◽

2018 ◽

Vol 5 (5) ◽

pp. 172382 ◽

Cited By ~ 7

Author(s):

Wei Guo ◽

Shujuan Wang ◽

Yunkai Wang ◽

Shaoyong Lu ◽

Yue Gao

Keyword(s):

Aqueous Solutions ◽

Adsorption Capacity ◽

Functional Groups ◽

Rice Husk ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Adsorption Data ◽

Magnetic Modification ◽

Pseudo Second Order ◽

Rice Husk Biochar

A magnetically modified rice husk biochar (MBC) was successfully prepared by a hydrothermal method from original biochar (BC) and subsequently used to remove phenanthrene (PHE) from aqueous solutions. The porosity, specific surface area and hydrophobicity of BC were significantly improved (approx. two times) after magnetic modification. The adsorption data fitted well to pseudo-second-order kinetic and Langmuir models. Compared with BC, MBC had a faster adsorption rate and higher adsorption capacity of PHE. The adsorption equilibrium for PHE on MBC was achieved within 1.0 h. The maximum adsorption capacity of PHE on MBC was 97.6 mg g −1 based on the analysis of the Sips model, which was significantly higher than that of other sources of BCs. The adsorption mechanism of the two BCs was mainly attributed to the action of surface functional groups and π–π-conjugated reactions. The adsorption of PHE on MBC mainly occurred in the functional groups of C–O and Fe 3 O 4 , but that on BC was mainly in the functional groups of –OH, N–H, C=C and C–O.

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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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Preparation of lignin-based mesoporous biochar nano- and microparticles, and their adsorption properties for hexavalent chromium

BioResources ◽

10.15376/biores.16.3.6363-6377 ◽

2021 ◽

Vol 16 (3) ◽

pp. 6363-6377

Author(s):

Yu Hu ◽

Meng Ling ◽

Xianfa Li

Keyword(s):

Adsorption Capacity ◽

Functional Groups ◽

Pyrolysis Temperature ◽

Waste Water Treatment ◽

Bet Surface Area ◽

Isotherm Models ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Contaminated Waste ◽

Mesoporous Biochar

The removal performance and mechanism of Cr(VI) from aqueous solution was studied for a novel micro-nano particle kraft lignin biochar (BC) pyrolyzed at 400 to 700 °C. The physicochemical properties of BC were determined by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and N2 adsorption-desorption isotherms. The results illustrated that the BC had irregular micro- and nanoparticles with abundant pore structure and high BET surface area (111.1 m2/g). The FT-IR results showed that the lower pyrolysis temperature resulted in more oxygen-containing functional groups. The Cr(VI) adsorption capacity decreased with the pyrolysis temperature increasing from 400 to 700 °C, and the maximum percentage removal of Cr(VI) for BC obtained at 400 °C was 100% at pH 2, which suggested that the removal efficiency was mainly dependent on functional groups. Kinetic analysis demonstrated that Cr(VI) adsorption on BC fit well to the pseudo-second-order kinetic model. The adsorption data was well fitted with the Langmuir isotherm models, and the maximum adsorption capacity was 37.2 mg/g at 298K. The BC could be reused twice with Cr(VI) removal of 63.91% and was suitable for Cr(VI) contaminated waste-water treatment.

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Parametric and adsorption kinetic studies of methylene blue removal from simulated textile water using durian (Durio zibethinus murray) skin

Water Science & Technology ◽

10.2166/wst.2015.247 ◽

2015 ◽

Vol 72 (6) ◽

pp. 896-907 ◽

Cited By ~ 18

Author(s):

S. M. Anisuzzaman ◽

Collin G. Joseph ◽

D. Krishnaiah ◽

A. Bono ◽

L. C. Ooi

Keyword(s):

Methylene Blue ◽

Adsorption Capacity ◽

Dye Adsorption ◽

Freundlich Isotherm ◽

Kinetic Studies ◽

Isotherm Models ◽

Batch Adsorption ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Durio Zibethinus

In this study, durian (Durio zibethinus Murray) skin was examined for its ability to remove methylene blue (MB) dye from simulated textile wastewater. Adsorption equilibrium and kinetics of MB removal from aqueous solutions at different parametric conditions such as different initial concentrations (2–10 mg/L), biosorbent dosages (0.3–0.7 g) and pH solution (4–9) onto durian skin were studied using batch adsorption. The amount of MB adsorbed increased from 3.45 to 17.31 mg/g with the increase in initial concentration of MB dye; whereas biosorbent dosage increased from 1.08 to 2.47 mg/g. Maximum dye adsorption capacity of the durian skin was found to increase from 3.78 to 6.40 mg/g, with increasing solution pH. Equilibrium isotherm data were analyzed according to Langmuir and Freundlich isotherm models. The sorption equilibrium was best described by the Freundlich isotherm model with maximum adsorption capacity of 7.23 mg/g and this was due to the heterogeneous nature of the durian skin surface. Kinetic studies indicated that the sorption of MB dye tended to follow the pseudo second-order kinetic model with promising correlation of 0.9836 < R2 < 0.9918.

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Adsorption of methylene blue by using novel chitosan-g-itaconic acid/bentonite nanocomposite – equilibrium and kinetic study

Water Science & Technology ◽

10.2166/wst.2017.077 ◽

2017 ◽

Vol 75 (8) ◽

pp. 1932-1943 ◽

Cited By ~ 7

Author(s):

Farzaneh Shakib ◽

Ahmad Dadvand Koohi ◽

Arash Kamran Pirzaman

Keyword(s):

Methylene Blue ◽

Adsorption Capacity ◽

Itaconic Acid ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Oh Groups ◽

Maximum Sorption ◽

Equilibrium Data ◽

Order Kinetic Model ◽

The Fourier Transform

In this study, novel chitosan-g-itaconic acid/bentonite (CTS-g-IA/BT) and chitosan/bentonite (CTS/BT) nanocomposites were synthesized for adsorption of methylene blue (MB) from aqueous solution. The process was pH-sensitive and maximum sorption was obtained at pH 6 (CTS-g-IA/BT) and 7 (CTS/BT) in 76 h agitation time using 0.03 g of nanocomposites for 50 mL of MB solution. The results showed that in pH less than 6, the adsorption capacity of CTS-g-IA/BT nanocomposite due to the existence of IA monomer is less than that of CTS/BT nanocomposite. The Fourier transform infrared spectroscopy (FTIR) spectrum of CTS-g-IA/BT revealed that both itaconic acid and BT present in the nanocomposite structure, and also the –OH groups of BT, –NH2 and –OH of CTS participated in nanocomposite formation. According to the FTIR results, a schematic diagram of the nanocomposite synthesis was presented. The kinetic results indicated that the adsorption of MB fitted well with the pseudo-second-order kinetic model. The equilibrium data followed Langmuir isotherm with the maximum adsorption capacity of 500 and 181.818 mg/g for CTS-g-IA/BT and CTS/BT nanocomposites, respectively. The negative values of Gibbs free energy change (ΔG0) and the positive values of ΔH0 confirmed that the adsorption process is spontaneous and endothermic. The positive values of ΔS0 suggested the randomness of adsorption at interface.

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Adsorption of methylene blue onto betel nut husk-based activated carbon prepared by sodium hydroxide activation process

Water Science & Technology ◽

10.2166/wst.2020.451 ◽

2020 ◽

Vol 82 (9) ◽

pp. 1932-1949

Author(s):

Mondira Bardhan ◽

Tamanna Mamun Novera ◽

Mumtahina Tabassum ◽

Md. Azharul Islam ◽

Ali H. Jawad ◽

...

Keyword(s):

Methylene Blue ◽

Activated Carbon ◽

Adsorption Capacity ◽

Chemical Activation ◽

Maximum Adsorption Capacity ◽

Activation Process ◽

Order Kinetic ◽

Betel Nut ◽

Non Linear ◽

Mb Adsorption

Abstract In this study, activated carbon (AC) was prepared from agro-waste betel nut husks (BNH) through the chemical activation method. Different characterization techniques described the physicochemical nature of betel nut husks activated carbon (BNH-AC) through Fourier transform infrared spectroscopy (FTIR), Brunauer–Emmett–Teller (BET), scanning electron microscopy (SEM), and pH point of zero charge. Later, the produced AC was used for methylene blue (MB) adsorption via numerous batch experimental parameters: initial concentrations of MB dye (25–250 mg/L), contact time (0.5–24 hours) and initial pH (2–12). Dye adsorption isotherms were also assessed at three temperatures where the maximum adsorption capacity (381.6 mg/g) was found at 30 °C. The adsorption equilibrium data were best suited to the non-linear form of the Freundlich isotherm model. Additionally, non-linear pseudo-second-order kinetic model was better fitted with the experimental value as well. Steady motion of solute particles from the boundary layer to the BNH-AC's surface was the possible reaction dynamics concerning MB adsorption. Thermodynamic study revealed that the adsorption process was spontaneous and exothermic in nature. Saline water emerged as an efficient eluent for the desorption of adsorbed dye on AC. Therefore, the BNH-AC is a very promising and cost-effective adsorbent for MB dye treatment and has high adsorption capacity.

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Polymer-Functionalized Magnetic Nanoparticles: Synthesis, Characterization, and Methylene Blue Adsorption

Materials ◽

10.3390/ma11081312 ◽

2018 ◽

Vol 11 (8) ◽

pp. 1312 ◽

Cited By ~ 11

Author(s):

Xinyu Zheng ◽

Huaili Zheng ◽

Rui Zhao ◽

Yongjun Sun ◽

Qiang Sun ◽

...

Keyword(s):

Methylene Blue ◽

Magnetic Nanoparticles ◽

Adsorption Capacity ◽

Monomer Concentration ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Solution Ph ◽

Functionalized Magnetic Nanoparticles ◽

Order Kinetic Model ◽

Pseudo Second Order

The removal of methylene blue (MB) from wastewater has attracted global concerns. In this study, polymer-functionalized magnetic nanoparticles for MB removal, Fe3O4@SiO2-MPS-g-AA-AMPS (FSMAA), were successfully synthesized by grafting acrylic acid (AA) and 2-acrylamido-2-methyl-1-propanesulfonic acid (AMPS) on the surface of vinyl-modified Fe3O4@SiO2. With various characterization techniques, it was confirmed that the obtained FSMAA had a core–shell structure, a good magnetic property, and plenty of functional groups on its surface. MB adsorption experiments showed that the adsorption capacity of FSMAA was notably enhanced as the grafted monomer concentration and solution pH were increased. The adsorption kinetic data and isothermal data were well described by the pseudo-second-order kinetic model and the Langmuir model, respectively. The maximum adsorption capacity of FSMAA was 421.9 mg g−1 with grafted monomer concentration at 2.0 mol L−1 and solution pH at 9, much higher than those of other adsorbents stated in previous literatures. Based on XPS analysis, surface adsorption mechanism between FSMAA and MB was electrostatic interaction, hydrogen bonding, and hydrophobic interaction. Furthermore, FSMAA was effectively regenerated by acid pickling, and the remaining adsorption capacity was more than 60% after eight adsorption–regeneration cycles. All the results demonstrated the self-made FSMAA was a desirable adsorbent to remove MB from wastewater.

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Study on Adsorption of Nickel and Methylene Blue in Aqueous Solution by Magnetic Carboxylate-Rich Carbon

VNU Journal of Science Earth and Environmental Sciences ◽

10.25073/2588-1094/vnuees.4586 ◽

2021 ◽

Vol 37 (2) ◽

Author(s):

Doan Van Dat ◽

Nguyen Hoai Thuong ◽

Tran Thi Kieu Ngan ◽

Le Thi Thanh Nhi ◽

Dao My Uyen ◽

...

Keyword(s):

Aqueous Solution ◽

Methylene Blue ◽

Adsorption Capacity ◽

Ph Value ◽

Isotherm Models ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

High Adsorption ◽

Endothermic Process ◽

High Adsorption Capacity

In this study, magnetic carboxylate-rich carbon material (Fe3O4@CRC) was synthesized via a low-temperature carbonization method and applied as an adsorbent for adsorption of Ni(II) ions and methylene blue (MB) in aqueous solution. The synthesized Fe3O4@CRC was characterized by various techniques (XRD, FTIR, FE-SEM, TEM, EDX, VSM, and BET). The adsorption kinetics, isotherms, thermodynamics, and the effects of key adsorption factors, including the pH value, initial adsorbate concentration, contact time, adsorbent dose and temperature were investigated in detail. The results showed that Fe3O4@CRC exhibited a high adsorption capacity for MB and Ni(II) with the maximum adsorption capacity of 187.26 mg/g and 106.75 mg/g, respectively. The adsorption of MB and Ni(II) on Fe3O4@CRC was a spontaneous and endothermic process, and was best described with the first-order kinetic model, Freundlich (for MB) and Langmuir (for Ni(II)) isotherm models. In addition, Fe3O4@CRC could maintain a high adsorption capacity after many consecutive cycles. Therefore, the Fe3O4@CRC material can be used as a highly efficient adsorbent for the removal of heavy metals and dyes from wastewater due to the advantages of high adsorption performance, easy separation, and good reusability.

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Synthesis and Evaluation of the Ability of Poly(Methacrylic Acid-co-acrylamide)/nanoclay Composite Hydrogel in the Adsorption of Methylene Blue Dye

10.21203/rs.3.rs-1071501/v1 ◽

2021 ◽

Author(s):

Hamid Safarzadeh ◽

Seyed Jamaleddin Peighambardoust ◽

Seyed Hamed Mousavi ◽

Reza Mohammadi ◽

Rauf Foroutan ◽

...

Keyword(s):

Methylene Blue ◽

Adsorption Capacity ◽

Methacrylic Acid ◽

Adsorption Process ◽

Particle Diffusion ◽

Maximum Adsorption Capacity ◽

Order Kinetic ◽

Nanocomposite Hydrogel ◽

Cloisite 30B ◽

Intra Particle Diffusion

Abstract The performance of poly(methacrylic acid-co-acrylamide/nanoclay composite (poly(MAA-co-AAm)/NCC) hydrogel to adsorb methylene blue (MB) dye from aqueous solutions was investigated and the adsorption efficiency was improved by incorporating Cloisite 30B nanoclays in the adsorbent structure. The hydrogels were analyzed using FTIR, XRD, TGA, and SEM analysis. The effect of adsorbent dose, temperature, initial dye concentration, contact time, and pH on the efficiency of the adsorption process was investigated. Adsorption efficiencies of 98.57 and 97.65% were obtained for poly(MAA-co-AAm)/NCC and poly(MAA-co-AAm) hydrogels, respectively. Kinetic study revealed that the adsorption process followed pseudo-first-order kinetic model and α-parameter values of 6.558 and 1.113 mg/g.min were obtained for poly(MAA-co-AAm)/NCC and poly(MAA-co-AAm) hydrogels, respectively indicating a higher ability of nanocomposite hydrogel in adsorbing MB-dye. In addition, the results of the intra-particle diffusion model showed that various mechanisms such as intra-particle diffusion and liquid film penetration are important in the adsorption. The Gibbs free energy parameter of adsorption process showed negative values of -256.52 and -84.071 J/mol.K for poly(MAA-co-AAm)/NCC and poly(MAA-co-AAm) hydrogels indicating spontaneous nature of the adsorption. The results of enthalpy and entropy showed that the adsorption process was exothermic and random collisions were reduced during the adsorption. The equilibrium data for the adsorption process using poly(MAA-co-AAm)/NCC and poly(MAA-co-AAm) hydrogels followed Freundlich and Langmuir isotherm models, respectively. The maximum adsorption capacity values of 32.83 and 21.92 mg/g were obtained for poly(MAA-co-AAm)/NCC and poly(MAA-co-AAm) hydrogels, respectively. Higher adsorption capacity of nanocomposite hydrogel was attributed to the presence of Cloisite 30B clay nanoparticles in its structure. In addition, results of RL, n, and E parameters showed that the adsorption process was performed optimally and physically.

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