Copper removal using carnauba straw powder: Equilibrium, kinetics, and thermodynamic studies

Silva, Alfredo José Ferreira da; Moura, M. C. P. A.; Santos, Erinéia da Silva; Pereira, Jéssyca Emanuella Saraiva; Neto, Eduardo Lins de Barros

doi:10.1016/j.jece.2018.10.028

Cited by 15 publications

(5 citation statements)

References 56 publications

(69 reference statements)

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“…Additionally, Ferreir et al [22] confirmed that higher adsorbent dosages result in a higher removal percentage. When the adsorbent concentration increases, the diffusion Removal Efficiency Adsorbent dose (mg) q HTiO2@AC/SiO2 Vis.Light q HTiO2@AC/SiO2 Dark HTiO2@AC/SiO2 Removal Ratio Vis.Light HTiO2@AC/SiO2 Removal Ratio Dark qe (mg/g) reduces due to various causes such as solute availability, interference between binding sites, electrostatic interactions, and reduced mixing due to high adsorbent concentration in the solution.…”

Section: The Effect Of Phmentioning

confidence: 95%

Removing the Oxamyl from Aqueous Solution by a Green Synthesized HTiO2@AC/SiO2 Nanocomposite: Combined Effects of Adsorption and Photocatalysis

et al. 2022

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The photocatalytic degradation and adsorption of the oxamyl pesticide utilizing a nano-HTiO2@activated carbon-amorphous silica nanocomposite catalyst (HTiO2@AC/SiO2). Sol-gel Synthesis was used to produce HTiO2@AC/SiO2, which was examined using Scanning Electron Microscopy, Transmission Electron Microscopy, and an X-ray diffractometer. The analyses confirmed that HTiO2 is mainly present in its crystalline form at a size of 7–9 nm. The efficiency of HTiO2@AC/SiO2 was assessed at various pHs, catalyst doses, agitating intensities, initial pesticide concentrations, contact times, and temperatures under visible light and in darkness. Oxamyl adsorption kinetics followed a pseudo-second-order kinetic model, suggesting that the adsorption process is dominated by chemisorption, as supported by a calculated activation energy of −182.769 kJ/mol. The oxamyl adsorption is compatible with Langmuir and Freundlich isotherms, suggesting a maximum adsorption capacity of 312.76 mg g−1. The adsorption capacity increased slightly with increasing temperature (283 K < 323 K < 373 K), suggesting an exothermic process with the Gibbs free energy change ΔG, enthalpy change ΔH, and entropy change ΔS°, being –3.17 kJ/mol, −8.85 kJ/mol, and −0.019 J/mol K, respectively, at 310 K for HTiO2@AC/SiO2 under visible light. This indicates spontaneous adsorption, and negative (ΔS) explain a decreased randomness process. HTiO2@AC/SiO2 would be a promising material.

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Section: The Effect Of Phmentioning

confidence: 95%

Removing the Oxamyl from Aqueous Solution by a Green Synthesized HTiO2@AC/SiO2 Nanocomposite: Combined Effects of Adsorption and Photocatalysis

et al. 2022

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“…The results are listed in Table . The PAG adsorption capacity for Cu(II) was higher than that of almost all listed existing adsorbent materials (9.50–214 mg g −1 ) . However, these existing adsorbent materials were usually difficult to prepare owing to the complex and expensive synthesis process required.…”

Section: Resultsmentioning

confidence: 99%

A facilely synthesized polyanionic gel adsorbent with high adaptability and new adsorption effects for purification of Cu(II)‐containing wastewater

Song

Bai

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND: Cu(II)-containing wastewater causes serious pollution of the water environment. Adsorption is one of the most commonly used water purification methods, with the selection of suitable adsorbents being the key factor. This motivates the development of new efficient adsorbents to purify Cu(II)-containing wastewater. RESULTS:A highly adaptable polyanionic gel (PAG) was synthesized by the facile crosslinking copolymerization of acrylic acid (AA) and triallylmethylammonium chloride (TAMAC) at 65 ∘ C for 0.5 h, followed by a simple neutralization treatment, avoiding the inconvenience of the complex and expensive preparation process required to prepare existing adsorbents. When first used as an adsorbent material, PAG achieved highly efficient purification of a wide concentration range of 10-2000 mg L −1 Cu(II)-containing wastewater. The PAG adsorption capacity for Cu(II) was 222.2 mg g −1 , which was higher than the values of selected existing adsorbent materials (9.50-214 mg g −1 ), and PAG had the advantages of being eco-friendly, facilely obtained and regenerable. Also, PAG maintained stable adsorption ability even when the adsorption temperature varied from 30 to 50 ∘ C. Moreover, a series of new adsorption effects were first observed as the key factors for PAG adsorption to achieve high adaptability.CONCLUSION: Generally, considering the comprehensive performances, PAG would have higher adaptability in the efficient purification of different concentrations and different temperatures of Cu(II)-containing wastewater. It would thus have better application in different water environments and be regarded as a better adsorbent alternative.

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“…Some research did not use adsorbents from natural wastes to cupric adsorption [8][9]. To save the world by decreasing solid wastes, many raw and modified lignocellulosic materials [10][11] i.e., Thumbai (Leucus aspera) leaves [12], grape bagasse [13], and Carnauba straw powder [14], Sugarcane [15], pineapple leave [16][17] and pineapple crown [18] have been already used for cupric ion adsorption. Pineapple is very interesting since its component contains high cellulose to a good characteristic of an adsorbent.…”

Section: Introductionmentioning

confidence: 99%

Effects of Cupric Ion Adsorption onto the Modified Pineapple Pulp as a Biochar Adsorbent

Charnkeitkong,

Sripiboon

2024

KEM

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The cupric ion is toxic for humans and is contained in many industrial wastewater that should be effectively removed with adsorption before discharging into the natural water source. In this study, pineapple pulp was obtained from canned pineapple juice manufacturing for drying (DPP) and carbonization (CPP) for 2 h. at 400 °C as the fine biochar adsorbents. The specific surface area of DPP and CPP were 45.3 and 60.2 m2/g, respectively. A high surface area of the carbonized pineapple pulp as a fine adsorbent was found to effectively cupric ion adsorption capacity, the maximum cupric ion removal efficiency of 83.4% and 41.9 mg/g of adsorption capacity at a pH of 6.0 was attained after 30 minutes to equilibrium reach, initial feed concentration of copper (II) sulfate 5-hydrate (CuSO4 . 5H2O) 250 ppm and temperature 50 °C. From these results can be applied to remove the cupric ion from the wastewater treatment.

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Copper removal using carnauba straw powder: Equilibrium, kinetics, and thermodynamic studies

Cited by 15 publications

References 56 publications

Removing the Oxamyl from Aqueous Solution by a Green Synthesized HTiO2@AC/SiO2 Nanocomposite: Combined Effects of Adsorption and Photocatalysis

Removing the Oxamyl from Aqueous Solution by a Green Synthesized HTiO2@AC/SiO2 Nanocomposite: Combined Effects of Adsorption and Photocatalysis

A facilely synthesized polyanionic gel adsorbent with high adaptability and new adsorption effects for purification of Cu(II)‐containing wastewater

Effects of Cupric Ion Adsorption onto the Modified Pineapple Pulp as a Biochar Adsorbent

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