Efficiency of dye adsorption by biochars produced from residues of two rice varieties, Japanese Koshihikari and Vietnamese IR50404

Phương, Đỗ Thị Mỹ; Loc, Nguyen Xuan; Miyanishi, Takayuki

doi:10.5004/dwt.2019.24496

Cited by 30 publications

(14 citation statements)

References 53 publications

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“…The small elimination at low pH may be attributed to the statement that protons are found on the studied LLSP surface, which causes electrostatic repulsion between the adsorbed H þ and the cationic JGBD. These facts agree with those obtained in the last studies (Phuong et al 2019;Sebeia et al 2020). Figure 7 shows that the point of zero charges of the LLSP is 4.2, implying that the LLSP surface has positively charged at pH fewer than the pH pzc .…”

Section: Investigation Of the Factors Influencing The Jgbd Biosorptio...supporting

confidence: 90%

The application of wasteLeucaena leucocephalaseed pods as a bio-based adsorbent for decolourization of solution

Alkhafaji

Samaka

2022

Water Practice and Technology

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The adsorption method is widely used in water and wastewater treatment; however, most industrial adsorbents are expensive, limiting the use of the adsorption method in developing countries. Therefore, this study aims at developing a biosorbent from the wasted Leucaena leucocephala seed pods (LLSP) and apply it (as a cost-effective bio-adsorbent) to remove Janus Green B dye (JGBD) from solutions at different values of pH, agitation time, LLSP dose and JGBD concentration. Different techniques were used to characterize LLSP before and after JGBD removal, including pore size distribution, surface area (SBET) analysis, FTIR, SEM, SPM and the point of zero charges (pHpzc) of the LLSP surface. The results proved that LLSP could remove up to 95% of JGBD at pH, LLSP dose, JGBD concentration and agitation time of 9, 0.08 g/100 ml, 50 mg/l and 30 min, respectively. Langmuir and Freundlich were applied to fit the data of equilibrium biosorption, and it was noticed that the Langmuir isotherm model fits the data, and the full monolayer biosorption ability for JGBD was 142.85 mg/g.

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Section: Investigation Of the Factors Influencing The Jgbd Biosorptio...supporting

confidence: 90%

The application of wasteLeucaena leucocephalaseed pods as a bio-based adsorbent for decolourization of solution

Alkhafaji

Samaka

2022

Water Practice and Technology

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“…But elevated biochar dosage led to a saturation of the % of MB dye removal ascribed to particle aggregation which resulted in reduced biochar surface area available and improvement in the diffusion path length, thereby resulting in reduced removal. A comparable pattern was illustrated in the studies relating to MB dye removal to different biomaterials by [64,[66][67][68].…”

Section: Effect Of Biochar Dosage On the Biosorption Of Mb Dyesupporting

confidence: 69%

“…Also, the increased competition between MB + with the H + and H 3 O + ions for the biochar sorption sites leads to a reduced % of MB dye removed at acidic pH. The removal of MB dye to the various biochars at low pH values was due to interactions such as hydrogen bonding, π-π or π + -π interaction, and porous diffusion [64]. The improved % of MB dye removed to the various biochars was attributed to the electrostatic attraction between the dominant negatively surface charges (which increased with improving the solution pH) and the predominant MB dye species (MB 1 dye).…”

Section: Effect Of Ph On the Adsorption Of Mb Dyementioning

confidence: 99%

Adsorption of methylene blue (MB) dye on ozone, purified and sonicated sawdust biochars

Eldeeb

Aigbe

Ukhurebor

et al. 2022

Biomass Conv. Bioref.

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The synthesized biochars derived from sawdust (SD) SD ozone (SDO) biochar, purified SD (PSD) biochar, and sonicated SD (SSD) biochar, which was employed in the confiscation of methylene blue (MB) dye ion, were characterized employing “Brunauer–Emmett–Teller (BET), scanning electron microscope (SEM), Fourier Transform Infrared (FTIR), and Thermal gravimetrical analysis (TGA).” The impact of various factors, such as pH, biochar dosage, and initial concentration, on MB dye sequestration, was tested in this study. It was found that the biosorption of MB dye to the various biochars was dependent on the solution pH, with optimum confiscation of MB observed at pH 12 for all biochars. Pseudo-second-order (PSO), Freundlich (FRH)- (SDO and SSD biochars), and Langmuir (LNR)- (PSD biochar) models were used to best describe the biosorption process of MB dye to various biochars. Based on the LNR model fitting to the experimental data, the optimum sorption capacities obtained using SDO, SSD, and PSD biochars were 200, 526, and 769 mg/g, respectively. Electrostatic interaction and hydrogen bonding played an important role in the interaction mechanism between the various biochars and MB dye. Hence, these studied SDO, PSD, and SSD biochars prepared from cheap, easily accessible, biodegradable, and non-hazardous agro-waste materials can be effectively used for the removal, treatment, and management of MB dye as well as other industrial effluents before their disposal into the environment.

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“…When ∆𝑆 < 0, the adsorption of adsorbate onto the adsorbent was less random (Bhowmik et al, 2021). It has been suggested that when -20 kJ mol -1 < ∆𝐺 < 0 and ∆𝐻 < 80 kJ mol -1 (Ma et al, 2021), and for the electrostatic interaction, the value of ∆𝐻 ranges from 20 to 80 kJ/mol, thus the adsorbateadsorbent interaction was governed by physical mechanism, mainly electrostatic interaction (Phuong et al, 2019). Therefore, the adsorption of VR 3 BS dye onto activated SCG biochar was a spontaneous, less random and exothermic process.…”

Section: Adsorption Thermodynamicsmentioning

confidence: 99%

“…This stage represented the movement of dye molecules from the bulk liquid phase to the external surface of biochar through a liquid boundary layer. The second step, i.e., from t ≥ 60 min, was a slower adsorption stage representing a rate controlled by intraparticle diffusion of dye molecules from the exterior of the biochar into micropores, mesopores and macropores of biochar (Phuong et al, 2019;Sumalinog et al, 2018;Yao et al, 2020).…”

Section: Adsorption Kinetic Studiesmentioning

confidence: 99%

Adsorption activity of spent coffee ground biochar for the removal of Vivizole Red 3BS dye from aqueous solution

Adamu

Zewge

Chebude

2023

Preprint

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Spent coffee ground (SCG) is rich in carbon, and slow pyrolysis can convert biomass into biochar that can be used as an adsorbent to remove dyes. In one-step carbonization and activation of SCG, iron (III) chloride and K2CO3 were used as a catalyst and solid-state activator, respectively. The predictive model for the removal of the dye by the activated SCG biochar was evaluated through response surface methodology- central composite design (RSM-CCD). ANOVA result analysis showed that among the model terms, the effect of pH was the most significant in removing the Vivizole Red 3 BS 150 % (VR 3BS) dye. The optimum values suggested by the CCD were an initial dye concentration of 20 mg/L, pH 3, an adsorbent dose of 0.5 g per 100 mL, and a contact time of 60 min, where the optimum removal of the dye was 94 %. The optimum conditions were validated using synthetic and textile wastewater, and the percent removals of the VR 3BS dye by the activated SCG were 96% and 90 %, respectively. The dye removal efficiency of activated SCG biochar was more significant than that of commercial activated carbon. The Langmuir model best described the adsorption isotherm. Adsorption kinetic data fitted well to the pseudo-second-order model. Both intraparticle and film diffusions affected the dye's adsorption rate. The thermodynamics study has shown that the adsorption process was a spontaneous, less random, exothermic process governed by a physical sorption mechanism. Thermal regeneration of the exhausted biochar improved VR 3BS dye removal efficiency.

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Efficiency of dye adsorption by biochars produced from residues of two rice varieties, Japanese Koshihikari and Vietnamese IR50404

Cited by 30 publications

References 53 publications

The application of wasteLeucaena leucocephalaseed pods as a bio-based adsorbent for decolourization of solution

The application of wasteLeucaena leucocephalaseed pods as a bio-based adsorbent for decolourization of solution

Adsorption of methylene blue (MB) dye on ozone, purified and sonicated sawdust biochars

Adsorption activity of spent coffee ground biochar for the removal of Vivizole Red 3BS dye from aqueous solution

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