Single and competitive adsorptions of micropollutants using pristine and alkali-modified biochars from spent coffee grounds

Shin, Jaegwan; Lee, Yong-Gu; Lee, Sang-Ho; Kim, Sangwon; Ochir, Duuriimaa; Park, Yongeun; Kim, Jihye; Chon, Kangmin

doi:10.1016/j.jhazmat.2020.123102

Cited by 79 publications

(38 citation statements)

References 45 publications

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“…This result could be explained that DIU was not significantly affected by the humic acids for the GCRB-N. Similar behavior was observed for the outcompeting of the micropollutant adsorption by the biochars at the neutral pH condition in the humic acid presence [23].…”

Section: Effects Of Humic Acids On Adsorption Of Herbicidessupporting

confidence: 80%

“…However, the averaged pore size of the GCRB-N (3.05 nm) was significantly smaller than that of the GCRB (5.59 nm). These findings could explain the enhanced porous structures of GCRB-N associated with their adsorption capacities [23]. Thus, the GCRB-N are expected to improve the removal of herbicides from aqueous solutions compared with the GCRB.…”

Section: Bulk Elemental Composition and Functional Groups Analysesmentioning

confidence: 91%

“…In both neutral and alkaline conditions, AC and DIU are non-electrostatic interactions predominated, and the adsorption capacity is increased. These observations could be postulated that the differences in the hydrophobic and electrostatic interactions between herbicides and absorbents at the different pH conditions governed the adsorptions of the herbicides using the GCRB and GCRB-N [23].…”

Section: Effects Of Solution Ph On Adsorption Of Herbicidesmentioning

confidence: 99%

“…The detailed preparation procedures of the GCRB for the NaOH activation were the same as those in our previous study [23]. As briefly explained, the preparation procedures of the GCRB for the NaOH activation as follows: ground coffee residues were collected from a local coffee shop in Chuncheon-si (Gangwon Province, Korea), followed by rinsing with DI water and overnight drying in the oven at 105°C.…”

Section: Preparation Of Gcrb and Gcrb-nmentioning

confidence: 99%

“…The adsorption process could be divided two-phase for herbicides using GCRB and GCRB-N: (i) phase I, contact period ≤4 h and (ii) phase II, contact period >4 h. Phase I is the removal rates of the herbicides quickly enlarged as the physical adsorption occurred onto the surfaces of the GCRB and GCRB-N. Phase II is the removal rates of the herbicides slowly improved by the GCRB and GCRB-N since the inner layer complexation of absorbents played a critical role in removing the herbicides [23]. The adsorptions of the herbicides for the GCRB and GCRB-N reached their equilibrium states within 12 h and 16 h, respectively.…”

Section: Adsorption Of Herbicides: Kinetics Studiesmentioning

confidence: 99%

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Effects of NaOH Activation on Adsorptive Removal of Herbicides by Biochars Prepared from Ground Coffee Residues

et al. 2021

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In this study, the adsorption of herbicides using ground coffee residue biochars without (GCRB) and with NaOH activation (GCRB-N) was compared to provide deeper insights into their adsorption behaviors and mechanisms. The physicochemical characteristics of GCRB and GCRB-N were analyzed using Brunauer–Emmett–Teller surface area, Fourier transform infrared spectroscopy, scanning electron microscopy, and X-ray diffraction and the effects of pH, temperature, ionic strength, and humic acids on the adsorption of herbicides were identified. Moreover, the adsorption kinetics and isotherms were studied. The specific surface area and total pore volume of GCRB-N (405.33 m2/g and 0.293 cm3/g) were greater than those of GCRB (3.83 m2/g and 0.014 cm3/g). The GCBR-N could more effectively remove the herbicides (Qe,exp of Alachlor = 122.71 μmol/g, Qe,exp of Diuron = 166.42 μmol/g, and Qe,exp of Simazine = 99.16 μmol/g) than GCRB (Qe,exp of Alachlor = 11.74 μmol/g, Qe,exp of Diuron = 9.95 μmol/g, and Qe,exp of Simazine = 6.53 μmol/g). These results suggested that chemical activation with NaOH might be a promising option to make the GCRB more practical and effective for removing herbicides in the aqueous solutions.

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Section: Effects Of Humic Acids On Adsorption Of Herbicidessupporting

confidence: 80%

Section: Bulk Elemental Composition and Functional Groups Analysesmentioning

confidence: 91%

Section: Effects Of Solution Ph On Adsorption Of Herbicidesmentioning

confidence: 99%

Section: Preparation Of Gcrb and Gcrb-nmentioning

confidence: 99%

Section: Adsorption Of Herbicides: Kinetics Studiesmentioning

confidence: 99%

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Effects of NaOH Activation on Adsorptive Removal of Herbicides by Biochars Prepared from Ground Coffee Residues

et al. 2021

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Functionalized typha biochar for antibiotic removal via low‐carbon integrated method: Performance and mechanism analyses

Liu,

Wen,

et al. 2024

CLEAN Soil Air Water

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Antibiotic residues in water represent an urgent environmental challenge. To efficiently remove these residues, a low‐carbon integrated biochar synthesis method was proposed, and an optimized typha biochar (TBIK) was prepared. Compared with the biochar prepared by a conventional two‐step carbonization and activation method (TBTK), the TBIK preparation process reduced energy consumption by 43849.58 J and cut carbon dioxide emissions by 32.80%. TBIK exhibited a large surface area of 1252.40 m2/g and rapidly achieved an equilibrium removal efficiency of 99.95% within 20 min for simulated antibiotics wastewater. Furthermore, TBIK possessed more number of functional groups than TBTK, especially O‐H and C‐S groups. The adsorption stability and tolerance of TBIK in solutions with different ionic strengths and coexisting anions were examined. Characterization techniques such as scanning electron microscopy (SEM), Fourier transform infrared (FT‐IR), and X‐ray photoelectron spectroscopy (XPS) as well as Brunauer, Emmett and Teller (BET) analyses were employed to elucidate the morphology and adsorption mechanism of the adsorbent. The microporous structure and abundance of functional groups are key to the excellent adsorption capabilities of TBIK. Thus, this integrated method for biochar production, optimized for treating antibiotic wastewater, holds significant potential for future applications.

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EDTA functionalized pine needle biochar (EDTA@BC); a valorized bio‐material for removal of Ni(II) from aqueous solution

Rasheed,

Kayani

et al. 2024

Microscopy Res & Technique

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The preparation of ethylenediaminetetraacetic acid (EDTA) functionalized pine needles biochar (EDTA@BC) as a low‐cost active adsorbent and its effectiveness in removing Ni(II) from aqueous solution at various conditions is reported in this paper. First, alkali activation was selected to render the pine needle biochar with an excellent porous structure and increased concentration of hydroxyl groups to facilitate grafting. Subsequently, a simple method was utilized to graft EDTA onto the biochar. The prepared EDTA@BC was characterized by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and energy dispersive x‐ray spectrometry (EDX). Batch adsorption studies were conducted to assess the impact of various parameters such as solution pH, adsorbent dosage, adsorbate volume, and shaking time on the removal efficiency of Ni(II). At pH 6, 100 mg dosage, 4 mL of adsorbate volume, and 10 min of shaking time, the maximum removal efficiency of Ni(II) was observed to be 89%. EDTA@BC showed reasonable sorption performance still after the third cycle of regeneration. The effect of interfering ions such as Pb, Cr, Cu, and Hg was evaluated, resulting a decrease of 69%, 78%, 76%, and 68%, respectively, in its sorption capacity. The Langmuir model provided a better fit for Ni(II) in the concentration range of 0.1–2000 ppm under optimized conditions, with qmax of 46.69 ± 1.031 mg/g and KL of 0.001, compared with the Freundlich isotherm, which yielded n = 0.234 and χ2 = 2.7899, Temkin isotherm (R2 = 0.9520), and Redlich‐Peterson isotherm (R2 = 0.9725). The removal of Ni(II) by EDTA@BC was found to be the pseudo‐second‐order kinetics. Thermodynamic studies indicated adsorption process to be endothermic and nonspontaneous. Hence, a sustainable valorized bio‐material (EDTA@BC) is prepared having better sorption efficiency of Ni(II) from aqueous solution with possible wide applicability.Research Highlights New EDTA functionalized indigenous pine needles biochar (EDTA@BC) was prepared. This low‐cost active adsorbent found effective in removing Ni(II) from aqueous solution. FTIR, SEM, and EDX proved synthesis and uptake of Ni(II) from aqueous solution. Ni(II) removal, regeneration, interfering and adsorption studies were performed by UV–Vis spectroscopy.

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Single and competitive adsorptions of micropollutants using pristine and alkali-modified biochars from spent coffee grounds

Cited by 79 publications

References 45 publications

Effects of NaOH Activation on Adsorptive Removal of Herbicides by Biochars Prepared from Ground Coffee Residues

Effects of NaOH Activation on Adsorptive Removal of Herbicides by Biochars Prepared from Ground Coffee Residues

Functionalized typha biochar for antibiotic removal via low‐carbon integrated method: Performance and mechanism analyses

EDTA functionalized pine needle biochar (EDTA@BC); a valorized bio‐material for removal of Ni(II) from aqueous solution

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