Removal of Cr(<scp>vi</scp>) from aqueous solution using magnetic modified biochar derived from raw corncob

Hoang, Le Phuong; Van, Huu Tap; Nguyen, Lan Huong; Mac, Duy-Hung; Vu, Thuy; Ha, L.T.; Nguyen, X.C.

doi:10.1039/c9nj02661d

Cited by 81 publications

(27 citation statements)

References 41 publications

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“…For WSC, KOH modified had the highest saturation adsorption capacity because KOH had a high hole expansion ability. 45 , 46 During the pretreatment process, KOH removed a large amount of ash inside the pores and had an ablation effect that made the micropores thinner or burned through, which increased the pore size to facilitate the adsorption. The saturation adsorption capacity after H 3 PO 4 treatment was the lowest, which may have been due to the higher lignin content in the walnut shell, which facilitated the formation of biochar carbonization.…”

Section: Resultsmentioning

confidence: 99%

Preparation of Acid- and Alkali-Modified Biochar for Removal of Methylene Blue Pigment

et al. 2020

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Walnut shell biochar (WSC) and wood powder biochar (WPC) prepared using the limited oxygen pyrolysis process were used as raw materials, and ZnCl2, KOH, H2SO4, and H3PO4 were used to modify them. The evaluation of the liquid-phase adsorption performance using methylene blue (MB) as a pigment model showed that modified biochar prepared from both biomasses had a mesoporous structure, and the pore size of WSC was larger than that of WPC. However, the alkaline modified was more conducive to the formation of pores in the biomass-modified biochar materials; KOH treatment resulted in the highest modified biochar-specific surface area. The isothermal adsorption of MB by the two biomass pyrolysis charcoals conformed to the Freundlich equation, and the adsorption process conformed to the quasi-second-order kinetic equation, which is mainly physical adsorption. The large number of oxygen-containing functional groups on the particle surface provided more adsorption sites for MB adsorption, which was beneficial to the adsorption reactions. The adsorption effects of woody biomass were obviously higher than that of shell biomass, and the adsorption capacities of the two raw materials’ pyrolysis charcoal were in the order of WPC > WSC. The adsorption effects of different treatment reagents on MB were in the order ZnCl2 > KOH > H3PO4 > H2SO4. The maximum adsorption capacities of the two biomass treatments were 850.9 mg/g for WPC with ZnCl2 treatment and 701.3 mg/g for WSC with KOH treatment.

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Section: Resultsmentioning

confidence: 99%

Preparation of Acid- and Alkali-Modified Biochar for Removal of Methylene Blue Pigment

et al. 2020

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“…Detailed batch experiments were conducted to evaluate the effects of various parameters 16,19,20 (pH, initial phosphate concentration, contact time, and adsorbent dose) on the adsorption capacity of AgNPs-TAC for phosphate. Briefly, predetermined amounts of AgNPs-TAC were added into the 50 mL Erlenmeyer flasks containing 25 mL of K 2 HPO 4 solution.…”

Section: Batch Adsorption Experiments Initially An Adsorption Expermentioning

confidence: 99%

Phosphate Adsorption by Silver Nanoparticles-Loaded Activated Carbon derived from Tea Residue

Trinh

Nguyen

Van

et al. 2020

Sci Rep

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139

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Vu 6 , t. t. pham 7 , thi nu nguyen 8 , n. V. Quang 9 & X. c. nguyen 10,11* this study presents the removal of phosphate from aqueous solution using a new silver nanoparticlesloaded tea activated carbon (Agnps-tAc) material. in order to reduce costs, the tea activated carbon was produced from tea residue. Batch adsorption experiments were conducted to evaluate the effects of impregnation ratio of Agnps and tAc, pH solution, contact time, initial phosphate concentration and dose of Agnps-Ac on removing phosphate from aqueous solution. Results show that the best conditions for phosphate adsorption occurred at the impregnation ratio AgNPs/TAC of 3% w/w, pH 3, and contact time lasting 150 min. The maximum adsorption capacity of phosphate on AgNPs-TAC determined by the Langmuir model was 13.62 mg/g at an initial phosphate concentration of 30 mg/L. The adsorption isotherm of phosphate on AgNPs-TAC fits well with both the Langmuir and Sips models. The adsorption kinetics data were also described well by the pseudo-first-order and pseudo-secondorder models with high correlation coefficients of 0.978 and 0.966, respectively. The adsorption process was controlled by chemisorption through complexes and ligand exchange mechanisms. this study suggests that Agnps-tAc is a promising, low cost adsorbent for phosphate removal from aqueous solution.

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“…On the basis of the analysis and discussion regarding the BET surface area and pore volume data of the biochars, it is clearly that the contribution of the pore-lling mechanism in RR24 adsorption onto the biochars was negligible. The BET surface area and pore volume of the biochars, which were applied in this study, were similar to some other biochars such as cassava rind carbon, 22 iron-modied biochar from corncob, 39 and eucalyptus bark bio-char. 12…”

Section: Physical Properties Of the Adsorbentsmentioning

confidence: 53%

“…This trend was similar to that of the previously reported studies. [37][38][39] For instance, Nguyen et al (2019) 38 indicated that the Cr(VI) adsorption capacity of Ag nanoparticle-modied activated carbon increased with the Ag nanoparticle loading ratio and reached a plateau at a loading ratio of 2 wt%. Trinh et al (2020) 37 reported that the optimal Ag nanoparticle loading for the adsorption of P was 3 wt%.…”

Section: Effect Of Zno Nanoparticle Loading Ratio On Rr24 Adsorption mentioning

confidence: 99%

The enhancement of reactive red 24 adsorption from aqueous solution using agricultural waste-derived biochar modified with ZnO nanoparticles

Van

Nguyen

Dang³

et al. 2021

RSC Adv.

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Removal of Cr(vi) from aqueous solution using magnetic modified biochar derived from raw corncob

Abstract: Magnetic modified-corncob biochar with an impregnation ratio of iron at 20% (w/w) was used for removal of Cr(vi) from aqueous solution.

Cited by 81 publications

References 41 publications

Preparation of Acid- and Alkali-Modified Biochar for Removal of Methylene Blue Pigment

Preparation of Acid- and Alkali-Modified Biochar for Removal of Methylene Blue Pigment

Phosphate Adsorption by Silver Nanoparticles-Loaded Activated Carbon derived from Tea Residue

The enhancement of reactive red 24 adsorption from aqueous solution using agricultural waste-derived biochar modified with ZnO nanoparticles

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