Methylene blue removal from aqueous solutions using a biochar/gellan gum hydrogel composite: Effect of agitation mode on sorption kinetics

Elgarahy, Ahmed M.; Mostafa, H. Y.; Zaki, E. G.; Elsaeed, Shimaa M.; Elwakeel, Khalid Z.; Akhdhar, Abdullah; Guibal, Eric

doi:10.1016/j.ijbiomac.2023.123355

Cited by 46 publications

(7 citation statements)

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“…On the one hand, the reason may be that Na + neutralizes the negative charge on the surface of the adsorbent, reducing the adsorption effect of MG. On the other hand, ions can promote the protonation of MG, prevent the agglomeration of dye molecules, and promote adsorption [55,56]. The adsorption rate did not change significantly, and the change of ion concentration had little effect on the adsorption effect, which was consistent with the results of Elgarahy et al [57,58]. The study investigated the effects of four inorganic salts (NaCl, Na 2 SO 4 , Na 2 CO 3 and NaHCO 3 ) of 0.1 mol L −1 on the adsorption of MG by MBC.…”

Section: Effect Of Ionic Strengthsupporting

confidence: 90%

Study on adsorption performance and mechanism of peanut hull-derived magnetic biochar for removal of malachite green from water

Zhao,

Hua,

Wang

et al. 2023

Mater. Res. Express

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Magnetic biochar (MBC) has the advantages including wide source of raw materials and low cost, and has become a potential adsorbent for water treatment, overcoming the shortcomings of biochar (BC) with the hard separation of solid and liquid. Peanut hull-derived magnetic biochar loaded with Fe3O4 (Fe3O4/BC) was prepared by co-precipitation method. By means of material characterization and batch processing experiments, material properties and environmental factors affecting adsorption performance were investigated. The adsorption mechanism of Fe3O4/BC on malachite green (MG) was revealed using adsorption isotherms, adsorption kinetics and thermodynamics. The results showed that Fe3O4 particles were uniformly loaded, the total pore volume was increased, surface oxygen-containing functional groups were formed, and the maximum adsorption capacity of the biochar reached 175.4mg/g, 1.6 times of that before modification. In a wide PH range, Fe3O4/BC showed high adsorption performance for MG, and significant influence from ionic strength wasn’t found. Chemical adsorption was the main adsorption mechanism, including electrostatic interaction, cation exchange, hydrogen bonding and π-π interaction. The study of adsorption mechanism will promote the application of MBC in the removal of organic pollutants from water.

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Section: Effect Of Ionic Strengthsupporting

confidence: 90%

Study on adsorption performance and mechanism of peanut hull-derived magnetic biochar for removal of malachite green from water

Zhao,

Hua,

Wang

et al. 2023

Mater. Res. Express

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“…Ion exchange Small amount of sludge High operation cost [4] Coagulation/flocculation low energy consumption No complete removal of heavy metals [5] Chemical precipitation Low capital cost Large amount of sludge [6] Flotation Economically efficient Low elimination efficiency [7] Membrane filtration High separation selectivity High operational cost [8] Adsorption Easy and simple operation Weak selectivity [9] Adsorption is a technology commonly employed in wastewater treatment due to its cost-effectiveness, simplicity, high efficiency, and widespread application [9]. The literature contains reports regarding the utilization of adsorbents such as zeolites, activated carbon, biochar, nanocomposites, and others [10][11][12][13][14].…”

Section: Advantages Disadvantagesmentioning

confidence: 99%

“…Adsorption is a technology commonly employed in wastewater treatment due to its cost-effectiveness, simplicity, high efficiency, and widespread application [ 9 ]. The literature contains reports regarding the utilization of adsorbents such as zeolites, activated carbon, biochar, nanocomposites, and others [ 10 , 11 , 12 , 13 , 14 ].…”

Section: Introductionmentioning

confidence: 99%

Sustainable Bio-Based Adsorbents for Simultaneous and Efficient Removal of Hazardous Dyes from Aqueous Solutions

Vara,

Jha,

Bisht

et al. 2024

Toxics

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Dyes provide a notable environmental issue as a result of their intrinsic poisonous and carcinogenic characteristics. An estimated 60,000 metric tons of dyes has been discharged into the environment, leading to a substantial increase in water pollution. The mitigation of these dyes is a substantial and intricate challenge. The primary objective of this research is to conduct a comprehensive analysis of the adsorption of cationic dyes containing positively charged groups such as sulphonates, amines, and triphenylmethanes. The adsorption study was carried out using four different low-cost adsorbents derived from biowaste, specifically Groundnut Shell (GS), Mosambi Peel (MP), Mango Bark (MBARK), and Mango Leaves (ML). The adsorbent materials were characterized using FTIR, UV–Vis spectroscopy, scanning electron microscopy (SEM), point-of-zero charge (PZC), and BET techniques. The adsorption capacity was found to be between 1.5 and 2.2 mg/gm for Groundnut Shell, Mosambi Peel, Mango Bark, and Mango Leaves for individual dye removal (Crystal violet, Methylene blue, Rhodamine B, and Malachite green). It was observed that adsorbent derived from mango bark showed excellent adsorption (%) in a mono-component dye system and, thus, was explored for the simultaneous removal of a mixture of the same dyes. MBARK exhibited an excellent overall dye removal efficiency of 94.44% (Qe = 2.7 mg/g) for the dye mixture in 60 min. From a detailed kinetic investigation, it was concluded that the adsorption followed the pseudo-second-order model (R2= 0.99963 to 1 for different dyes and adsorbents) hinting at chemisorption. The effect of the pH of the analyte solution and the dosage of adsorbent was also studied for simultaneous removal. The isothermal studies demonstrated that the Langmuir adsorption model (R2 = 0.99416) was the best-fitted model, suggesting monolayer adsorption. The adsorption process was predicted to be governed by ion exchange, electrostatic interaction, hydrogen bonding, pi–pi interaction, etc., based on charge, functional groups, and pH of dyes and adsorbent. Thus, this study highlights the application of low-cost biowaste as a potential adsorbent for the mitigation of toxic industrial dyes present in wastewater.

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“…Compared with other technologies, the adsorption process can effectively remove organic or inorganic pollutants from contaminated water and has significant advantages such as low cost, high efficiency, easy to operate, and recyclable . In the past decades, various adsorbent materials have been developed and designed for the removal of pollutants such as heavy metals, dyes, antibiotics, pesticides, nitrogen, and phosphorus elements from wastewater. − However, most of the research on adsorbent materials has focused on adsorption performance as the main index, neglecting the green of raw materials and preparation processes. In recent years, with the enhancement of people’s environmental awareness, researchers are paying more and more attention to adsorbents made of natural materials. − …”

Section: Introductionmentioning

confidence: 99%

Green Fabrication of Porous Adsorbent with Structural Evolution of Mixed-Dimension Attapulgite Clay for Efficient Removal of Methylene Blue and Sustainable Utilization

Duan,

Zhu,

Liu

et al. 2024

ACS Sustainable Resour. Manage.

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In recent years, a variety of materials have been developed for water treatment, but green preparation and clean regeneration of absorbent materials have always neglected. Herein, porous materials were fabricated based on clean aqueous foam stabilized by natural plants Sapindus mukorossi (S. mukorossi) and mixed-dimensional attapulgite (MDAPT) clay. The effect of crystal defects of MDAPT clay on material preparation was investigated by the acid etching technique. The maximum adsorption capacity of the porous adsorbent prepared by the foam template for methylene blue was up to 847.7 mg/g, and the removal rate was >98% at ambient concentration. More importantly, the waste adsorbent was recycled for resource regeneration. The waste adsorbents were used as raw material to produce mineral biochar by a carbonization method for soil improvement. When the mineral biochar content was 1.5%, the pH of the soil increased from 4.51 to 6.36, and the electrical conductivity increased from 0.48 to 1.35 mS/cm. As a result of the improvement in soil structure and properties, the grown cabbage showed a significant increase in weight, length, and chlorophyll content. In conclusion, this work provides a sustainable idea for the green preparation of absorbent materials and for the recycling and reuse of waste materials.

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Methylene blue removal from aqueous solutions using a biochar/gellan gum hydrogel composite: Effect of agitation mode on sorption kinetics

Cited by 46 publications

References 100 publications

Study on adsorption performance and mechanism of peanut hull-derived magnetic biochar for removal of malachite green from water

Study on adsorption performance and mechanism of peanut hull-derived magnetic biochar for removal of malachite green from water

Sustainable Bio-Based Adsorbents for Simultaneous and Efficient Removal of Hazardous Dyes from Aqueous Solutions

Green Fabrication of Porous Adsorbent with Structural Evolution of Mixed-Dimension Attapulgite Clay for Efficient Removal of Methylene Blue and Sustainable Utilization

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