Sorptive removal of methylene blue from simulated wastewater using biochars derived from pulp and paper sludge

Chaukura, Nhamo; Murimba, Edna C.; Gwenzi, Willis

doi:10.1016/j.eti.2017.06.004

Cited by 57 publications

(16 citation statements)

References 33 publications

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“…As shown in Figure 7 a–c), the sorption isotherm of MB onto SMB was “L” shape. The equilibrium adsorption capacity of MB on SMB increased with the increase of the initial MB concentration, similar findings have been found in previous studies [ 34 , 50 ]. In order to find the most suitable adsorption model, data was fitted to Langmuir (Equation (4)) and Freundlich (Equation (5)) sotherm models.…”

Section: Resultssupporting

confidence: 91%

“…However, compared with the PFO (r 2 = 0.9454), the PSO (r 2 = 0.9784) was more suitable in describing the adsorption kinetics of MB on SMB. This means that the main determinant of the predominantly adsorption rate of MB on SMB was chemical adsorption [ 48 ], which involves valency forces by the sharing or exchange of electrons between SMB and MB [ 49 , 50 ].…”

Section: Resultsmentioning

confidence: 99%

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Preparation and Characterization of Sludge-Based Magnetic Biochar by Pyrolysis for Methylene Blue Removal

et al. 2021

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The development of low-cost adsorbent is an urgent need in the field of wastewater treatment. In this study, sludge-based magnetic biochar (SMB) was prepared by pyrolysis of sewage sludge and backwashing iron mud without any chemical agents. The samples were characterized by TGA, XRD, ICP, Organic element analysis, SEM, TEM, VSM and BET. Characterization analysis indicated that the magnetic substance in SMB was Fe3O4, and the saturation magnetization was 25.60 emu·g−1, after the adsorption experiment, SMB could be separated from the solution by a magnet. The batch adsorption experiment of methylene blue (MB) adsorption showed that the adsorption capacities of SMB at 298 K, 308 K and 318 K were 47.44 mg·L−1, 39.35 mg·L−1, and 25.85 mg·L−1, respectively. After one regeneration with hydrochloric acid, the maximum adsorption capacity of the product reached 296.52 mg·g−1. Besides, the adsorption kinetic described well by the pseudo-second order model revealed that the intraparticle diffusion was not just the only rate controlling step in adsorption process. This study gives a reasonable reference for the treatment of sewage sludge and backwashing iron mud. The product could be used as a low-cost adsorbent for MB removal.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

Preparation and Characterization of Sludge-Based Magnetic Biochar by Pyrolysis for Methylene Blue Removal

et al. 2021

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“…Active sites are the adsorptive part of the chemical functional groups; every active site is capable of binding at least or maximum one molecule of Hg 2+, the Hg 2+ molecule is bonded on the active site of the adsorbent through physical and chemical interaction. As the adsorption process is ongoing, most active sites will be occupied by the Hg2+ molecules, causing a decrease in Hg 2+ that can be adsorbed onto the adsorbent (Chaukura et al, 2017).…”

Section: Effect Of Initial Concentration On the Rate Of Adsorptionmentioning

confidence: 99%

Bentonite and Magnetite Filler-Modified Polyurethane Foam in Fixed Bed Column for the Adsorption of Mercury(II) Ions from Aqueous Solution

Sarah

Adisalamun

Darmadi

et al. 2021

Aceh Int. J. Sci. Technol

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This paper proposed adsorbent development by synthesizing polyurethane foam (PUF) using a simple method, mixing polyol with isocyanate and adding fillers of bentonite and magnetite to the PUF matrix. The study's main objective was to produce a PUF-based adsorbent with high reactivity to remove Hg2+ in wastewater. This bentonite and magnetite filler-modified polyurethane foam (BMPUF) adsorbent was fixed in a bed column for the adsorption of mercury (II) ions from an aqueous solution. The effect of initial Hg2+ concentration on the removal rate and the effect of contact time on adsorption efficiency was investigated. Langmuir, Freundlich, and BET non-linear models were taken into account to determine the best adsorption isotherm fitting and obtain adsorption capacity, intensity, and pore volume. As a result, it followed the non-linear Freundlich model, and the average adsorption capacity and intensity were 0.466 mg/g and 0.923, respectively. The average BET-based pore volume obtained was 0.782 L/mg. The kinetics study showed that the non-linear pseudo-first-order kinetics model was more suitable for describing the Hg2+ adsorption kinetics. The maximum equilibrium adsorption capacity was 1.770 mg/g with the adsorption rate of 0.0013 min-1 based on the non-linear model. The effect of varying bentonite and magnetite ratio on adsorption isotherm and kinetics was also investigated. Overall, the potential application of BMPUF adsorbent in the adsorption of mercury (II) ions was demonstrated in the current study.

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“…Mô ̣t số nghiên cứu trước đây đã sử du ̣ng TSH cho loa ̣i bỏ MB trong môi trường nước [8][9][10][11] và nhiều loại sinh khối được sử dụng để chế tạo TSH như gỗ sồi [3], bả mía [6], phân heo [11], phân gà [12], bùn thải [13], và cây thân cỏ [14]. Năng lực hấp phụ MB cực đại từ các nghiên cứu cho thấy có sự khác nhau lớn giữa các loại TSH, ví dụ: hấp phụ cực đại đạt 1,623 mg/g của TSH từ thực vật [8], 33 mg/g của TSH từ bùn thải [15], và 7,2 mg/g của TSH từ chất thải [16].…”

Section: Mở đầU *unclassified

Study on Adsorption of Methylene Blue from Aqueous Solution by Biochar Derived from Mimosa Pigra Plant

Cường

2021

EES

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Biochar from mimosa pigra was studied to remove methylene blue (MB) from aqueous solution. The properties of biochars were determined using Fourier Transform Infrared, scanning electron microscope, and Brunauer–Emmett–Teller. The biochar achieved the yield of 24.62 % at 500 oC pyrolysis. The specific surface area of the biochar is 285.53 m2/g, the total pore size is 0.153 cm3/g and the ash content is 2.79%. The optimal dose of removing MB of the biochar is 5 g/L and the optimal pH is 2 - 10. MB removal reached over 80% in the first 30 min, followed by a stable period of 120 to 360 min reaching over 90% of removal. Maximum adsorption capacity reached 20.18 mg/g at 25 oC. MB adsorption data is suitable for kinetic models in order: Avrami > Elovich > PSO > PFO. The adsorption process may comprise physical and chemical adsorption andmultiple stages.

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Sorptive removal of methylene blue from simulated wastewater using biochars derived from pulp and paper sludge

Cited by 57 publications

References 33 publications

Preparation and Characterization of Sludge-Based Magnetic Biochar by Pyrolysis for Methylene Blue Removal

Preparation and Characterization of Sludge-Based Magnetic Biochar by Pyrolysis for Methylene Blue Removal

Bentonite and Magnetite Filler-Modified Polyurethane Foam in Fixed Bed Column for the Adsorption of Mercury(II) Ions from Aqueous Solution

Study on Adsorption of Methylene Blue from Aqueous Solution by Biochar Derived from Mimosa Pigra Plant

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