Investigation the isotherm and kinetics of adsorption mechanism of herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) on corn cob biochar

Binh, Quach An; Nguyen, Hong-Hai

doi:10.1016/j.biteb.2020.100520

Cited by 69 publications

(36 citation statements)

References 37 publications

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“…The Langmuir isotherm assumed that the adsorption took place only at homogenous sites within the CCB surface with uniform energy level, this demonstrated that pesticides mixture adsorption onto CCB followed monolayer adsorption [19]. Similar trends in many previous studies of pesticide removal from water by biochar fit the Langmuir model [32,47,52,53]. Moreover, results demonstrated that RL values were less than 1 which illustrated favorable adsorption of CCB for all tested pesticides.…”

Section: Adsorption Isothermal Modelssupporting

confidence: 81%

“…A broad band between 1270 and 870 cm -1 dedicated to the ‫‪O‬ـــ‪C‬‬ stretch in ethers, alcohols, phenols, esters, and acids, is evidence for the presence of cellulose and hemicelluloses [37,38]. Weak bands between 830 and 760 cm −1 characterized the aromatic C‫ــ‬H bonding, this reveals the aromatic benzene rings existing on the adsorbent surfaces, and its appearance attributed to the presence of lignin [15,39]. Peaks between 700 -400 cm -1 characterize ‫‪C‬ـــ‪C‬‬ stretching [40].…”

Section: Fourier Transform Infrared (Ftir) Spectroscopy Analysismentioning

confidence: 99%

“…During the last decade, there has been a steady increase in the number of studies on the use of biochar as promising adsorbents for pesticide removal from water [12][13][14][15]. However, research on the optimal adsorption conditions, isotherm, and kinetics of a mixture of pesticides by corn cob biochar (CCB) in an aqueous solution is rarely investigated.…”

Section: Introductionmentioning

confidence: 99%

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Low-cost corn cob biochar for pesticides removal from water

et al. 2021

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This work aimed to study the isotherm and kinetics of adsorption of a mixture of 10 pesticides (viz., atrazine, chlorfenvinphos, chlorpyrifos, cyprodinil, diazinon, dimethoate, diuron, ethion, malathion, and profenofos) on corn cob biochar (CCB) in an aqueous solution. CCB is a low-cost adsorbent produced from pyrolysis at 500°C for 3 h in an oxygenlimited condition. It was characterized by Brunauer-Emmett-Teller (BET), X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier-transform infrared (FTIR) spectroscopy. Liquid chromatography-tandem mass spectrometry (LC-MS/MS) was used to determine the residual pesticide concentration. Adsorption equilibrium and kinetics were investigated by using batch adsorption experiments. The optimized pH, contact time, adsorbent dose, and initial pesticides concentration for the maximum adsorption rates were found to be 3, 60 min, 10 g/L, and 500 μg/L, respectively. The sorption of all pesticides by CCB was found to enhance by decreasing pH; since the removal percentage of atrazine increased from 57 to 74 % by decreasing the pH from 9 to 3. The Langmuir model represented the adsorption process better than the Freundlich model with R 2 values ranging from 0.957 to 0.999. Adsorption kinetic data were fitted well with the pseudo-first order kinetic model. Accordingly, CCB can be used as an effective low-cost agricultural waste that could be applied for removing pesticide residues from water.

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Section: Adsorption Isothermal Modelssupporting

confidence: 81%

Section: Fourier Transform Infrared (Ftir) Spectroscopy Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Low-cost corn cob biochar for pesticides removal from water

et al. 2021

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“…Based on Table 2, the adsorption process tends to follow the Freundlich isotherm according to the linear coefficient value (R 2 ) which is closer to 1. Freundlich isotherm is an adsorption process following adsorption by multilayer adsorption and Freundlich can also describe physical adsorption (Wang et al, 2020) is supported by a value of 1/n<1 (Table 2) as the intensity of multilayer adsorption of adsorbate molecules on the surface of a heterogeneous material (Binh and Nguyen, 2020). The comparison of MB adsorption for several adsorbents is presented in Table 3.…”

Section: Resultsmentioning

confidence: 99%

M2+(Ni, Cu, Zn)/Al-LDH Composites with Hydrochar from Rambutan Peel and Study the Adsorption Efficiency for Organic Dyes

Mohadi

Normah

Palapa

et al. 2022

Environ. Nat. Resour. J.

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Ni/Al LDH, Cu/Al LDH, and Zn/Al LDH were composed with rambutan peel hydrochar (Hc) and the materials were applied as adsorbent for the removal of methylene blue from aqueous solution, measured using UV-Vis Spectrophotometric method. The preparation of the LDH-Hc composites were proven by XRD, FT-IR, and SEM analysis which showed similar characteristics of the LDH-Hc composites with pure LDH and hydrochar. The methylene blue removal efficiency was optimized by various parameters including adsorption selectivity, adsorption regeneration, pH, contact time, adsorption concentration, and temperature. The adsorption study analysis proved that LDH composited with rambutan peel hydrochar had a selective ability for methylene blue. Zn/Al-hydrochar had the most stable adsorption regeneration ability and adsorbed MB easily after seven regeneration cycles using water solvents and ultrasonic devices. Ni/Al-hydrochar and Cu/Al-hydrochar were effective up to five regeneration cycles for MB removal. The adsorption results showed that the optimal pH for MB adsorption was at pH 6 with an equilibrium adsorption contact time of 100 min and a tendency to follow the pseudo second order kinetic model. Parameter data of concentration and temperature of adsorption was determined using Langmuir and Freundlich equations. The results showed that the adsorption matched the Freundlich isotherm model with the adsorption capacity (qm) of Ni/Al-Hc, Cu/Al-Hc, and Zn/Al-Hc adsorbents reaching 144.928, 175.439, 217.391 mg/g, respectively, with the adsorption process taking place continuously, spontaneously, and endothermically.

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“…The mass spectrum conrmed all these feature through the distinct fragmentation patterns. In comparison with other related pesticides and adsorbents (Table 4) [19][20][21][22]30,32,35,[41][42][43][44][45][46][47][48][49][50][51] it is evident that DEAE-cellulose has superlative ability to remove 2,4-D with high adsorption capacity. DEAEcellulose could adsorb 2,4-D as high as 88% when tested in spiked run-off water from agriculture land.…”

Section: Discussionmentioning

confidence: 99%