Potential of rice husk ash in atrazine removal

N’diaye, Abdoulaye Demba; Boudokhane, Chedly; Kankou, Mohamed Ould Sid’Ahmed Ould; Dhaouadi, Hatem

doi:10.1080/02757540.2019.1604692

Cited by 15 publications

(9 citation statements)

References 33 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%

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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%

“…Sorption depends heavily on pH, for instance, pH can affect both the sorbate's ionization degree and the sorbent's surface charge during the sorption process [47]. As shown in Fig.…”

Section: Effect Of Initial Phmentioning

confidence: 99%

Low-cost corn cob biochar for pesticides removal from water

et al. 2021

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“…The obtained results and the isotherm parameters were shown in Figure 4 and Table 2. The results from Figure 4A revealed that the adsorption capacities of AC increased with increase in the atrazine concentration due to the growth in the driving force from the concentration gradient [25]. In addition, the results also denoted that the adsorption capacity decreased with increasing in the pH due to the electrostatic repulsion between the AC surface and the atrazine molecules.…”

Section: Adsorption Isotherm Studymentioning

confidence: 87%

Adsorption of Atrazine from Aqueous Solution onto Peanut Shell Activated Carbon: Kinetics and Isotherms Studies

Agani¹,

Fatombi²,

Topanou³

et al. 2020

AJAC

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In this study, the activated carbon (AC) was prepared from phosphoric acid activation of peanut shell and used as adsorbent for atrazine removal from aqueous solutions. The prepared AC was characterized by Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) techniques. The effect of parameters such as solution pH, contact time, adsorbent dosage and concentration of atrazine solution were studied on adsorption process. The results of characteristics study shown that the surface of AC was porous with numerous functional groups. The kinetic results revealed that the adsorption process was well described by the pseudo-second-order model than the pseudo-first-order model. The intraparticle diffusion model involved in the adsorption process by multi steps. The equilibrium data were in the best agreement with the Langmuir model than the Freundlich and the Temkin models. The maximum adsorption capacities calculated according to the Langmuir isotherm were 66.66, 52.63 and 48.08 mg g-1 at 30°C and at pH 5, 7 and 9 respectively. The results of this study pointed out that the activated carbon prepared from the peanut shell has strong adsorption potential toward the atrazine herbicide, hence, it could be used for efficient adsorption of pesticide residues and other hazardous pollutants from wastewater.

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“…In biosorption, pH is an important parameter as it affects both the ionization degree of the adsorbate and the surface charge of the adsorbent during the biosorption process 35 .…”

Section: Effect Of Phmentioning

confidence: 99%

Adsorption of Methylene Blue from aqueous solution using Senegal River Typha australis

N’diaye

Ali²,

Bollahi

et al. 2020

Mediterr.J.Chem.,

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In this work, batch adsorption experiments were carried out for the removal of Methylene Blue (MB) from aqueous solutions using Typha australis leaf as a low cost adsorbent. The effects of some variables governing the efficiency of the process such as adsorbent mass, pH, ionic strength, contact time and temperature were investigated. The adsorption kinetic data were analyzed using the Pseudo First Order (PFO) and Pseudo Second Order (PSO) models. The experimental equilibrium data were analyzed using Langmuir and Freundlich isotherm models. The results show that the PSO model is the best for describing the adsorption of MB by Typha australis for all initial MB concentrations. The equilibrium data fitted well with the Langmuir model with the monolayer adsorption capacity for MB-Typha australis leaf system was of 103.12 mg g-1. The values of activation parameters such as free energy (ΔG°), enthalpy (ΔH°) and entropy (ΔS°) were also determined as - 4.44 kJ mol−1, 55.13 kJ mol−1 and 203.21 J mol−1 K−1, respectively. The thermodynamics parameters of MB-Typha australis system indicate spontaneous and endothermic process. These results indicate that the Typha australis leaf can be feasibly employed for the eradication of MB from aqueous solution.

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Potential of rice husk ash in atrazine removal

Cited by 15 publications

References 33 publications

Low-cost corn cob biochar for pesticides removal from water

Low-cost corn cob biochar for pesticides removal from water

Adsorption of Atrazine from Aqueous Solution onto Peanut Shell Activated Carbon: Kinetics and Isotherms Studies

Adsorption of Methylene Blue from aqueous solution using Senegal River Typha australis

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