Mechanism of Cd(II) and Cu(II) Adsorption onto Few-Layered Magnetic Graphene Oxide as an Efficient Adsorbent

Guo, Tao; Bulin, Chaoke; Ma, Zeyu; Li, Bo; Zhang, Yanghuan; Zhang, Bangwen; Xing, Ruiguang; Ge, Xin

doi:10.1021/acsomega.1c01770

Cited by 40 publications

(10 citation statements)

References 52 publications

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“…Under alkaline conditions, there is competition between hydroxyl -OH- and Cr(VI) species (Cr 2 O 7 2− ), thus decreasing the adsorption capacities [ 37 , 38 ]. Our findings for Cu(II) and Cr(VI) removal were comparable to those in [ 39 , 40 , 41 , 42 ].…”

Section: Resultssupporting

confidence: 90%

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A Carbonized Zeolite/Chitosan Composite as an Adsorbent for Copper (II) and Chromium (VI) Removal from Water

et al. 2023

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To address Cu(II) and Cr(VI) water pollution, a carbonized zeolite/chitosan (C-ZLCH) composite adsorbent was produced via pyrolysis at 500 °C for two hours. C-ZLCH was characterized using scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), Fourier transform infrared spectroscopy (FTIR), dynamic light scattering (DLS), and zeta potential measurements. The batch experiments were performed by varying the initial pH, concentration, and contact time. The optimal pH values for Cu(II) and Cr(VI) were 8.1 and 9.6, respectively. The highest adsorption capacities for Cu(II) and Cr(VI) were 111.35 mg/g at 60 min and 104.75 mg/g at 90 min, respectively. The effects of chemicals such as sodium (Na+), glucose, ammonium (NH4+), and acid red 88 (AR88) were also studied. Statistical analysis showed that sodium had no significant effect on Cu(II) removal, in contrast to Cr(VI) removal. However, there was a significant effect of the presence of glucose, ammonium, and AR88 on both Cu(II) and Cr(VI) removal. The adsorption isotherm and kinetic models were fitted using Langmuir and pseudo-second-order models for Cu(II) and Cr(VI), respectively.

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Section: Resultssupporting

confidence: 90%

“…As can be seen that the linear correlation coefficient R 2 value of the pseudo-second-order was better than the first-order model for both Cu(II) and Cr(VI). These results indicate that the adsorption rate is controlled by chemical reactions [ 39 , 51 ].…”

Section: Resultsmentioning

confidence: 99%

A Carbonized Zeolite/Chitosan Composite as an Adsorbent for Copper (II) and Chromium (VI) Removal from Water

et al. 2023

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“…This is due to abundant fluoride molecules and available adsorption sites resulting in the increase of adsorption until reaching the adsorption equilibrium where the rate of adsorption equals the rate of desorption [5]. After equilibrium, the adsorption sites that were saturated by fluoride molecules may begin to release the fluoride molecules back into the aqueous solution, leading to the decrease of adsorption efficiency [20,21]. Therefore, the contact time of 180 min was chosen to be the optimum contact time of fluoride adsorption from aqueous solution for the subsequent experiments in this study.…”

Section: Effect Of Contact Timementioning

confidence: 99%

Adsorption of Fluoride from Aqueous Solution using Eggshell Pretreated with Plasma Technology

Khiewwijit

Chainetr²,

Thiangchanta³

et al. 2023

Trends Sci

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Fluoride is a toxic substance that can cause adverse effects on human health such as dental and skeletal fluorosis. Therefore, the objective of this study was to investigate the adsorption potential of fluoride from aqueous solution using eggshell pretreated with plasma technology and compare to untreated eggshell. The batch adsorption experiments of fluoride from aqueous solution using pretreated eggshell and untreated eggshell were carried out to compare their performances on fluoride removal efficiency, adsorption capacity and isotherm. The effects of adsorption factors of contact time (5 - 360 min), adsorbent dosage (10 - 35 g/L) and particle size of adsorbent (mesh sieve no.12 - 20 or 0.85 - 1.70 mm sieve opening) were studied. The results showed that with the initial fluoride concentration of 10 mg/L, the optimum condition for the adsorption of fluoride from aqueous solution was obtained with pretreated eggshell at contact time of 180 min, adsorbent dosage of 25 g/L and adsorbent size of Sieve no.16 (≤1.18 mm in diameter). With this optimum condition, the maximum fluoride removal efficiency increased from 59.88 % with untreated eggshell to 90.34 %, which was due to an increase in adsorption sites after surface modification process of eggshell. Moreover, the results clearly showed that adsorption isotherm was fitted by Langmuir model, which indicate a monolayered adsorption. The maximum adsorption capacity was 0.341 mg/g for pretreated eggshell, while this was 0.202 mg/g for untreated eggshell. This study showed that eggshell pretreated with plasma technology has potential for the application of the adsorption of fluoride from aqueous solution in the future and needs further investigation on the continuous adsorption column. HIGHLIGHTS Eggshell pretreated with plasma technology (EPPT) was applied for fluoride removal Effects of contact time, adsorbent dosage and size were examined by batch method Maximum fluoride (F) removal efficiency was 90.34 % with EPPT at optimum condition F adsorption on EPPT fitted Langmuir isotherm with maximum capacity of 0.341 mg/g GRAPHICAL ABSTRACT

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“…In order to facilitate separation after the adsorption process, the creation of magnetic properties through the fabrication of magnetic graphene nanocomposites is recommended 26 – 30 . Generally, Fe 3 O 4 magnetic nanoparticles have been widely used in the construction of nanocomposite adsorbents in magnetic SPE techniques due to their simplicity in synthesis and ease of application 31 – 34 , but pure Fe 3 O 4 nanoparticles are rapidly oxidized in the atmosphere and are not suitable for efficient adsorption in complicated matrices. In order to overcome these limitations and enhance the applicability of these types of adsorbents in real wastewater, the Fe 3 O 4 surface must be functionalized by a modifier with appropriate functional groups 8 , 35 .…”

Section: Introductionmentioning

confidence: 99%

Effective removal of Pb(II) ions using piperazine-modified magnetic graphene oxide nanocomposite; optimization by response surface methodology

Alboghbeish

Larki

Saghanezhad

2022

Sci Rep

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In this research, the piperazine-modified magnetic graphene oxide (Pip@MGO) nanocomposite was synthesized and utilized as a nano-adsorbent for the removal of Pb(II) ions from environmental water and wastewater samples. The physicochemical properties of Pip@MGO nanocomposite was characterized by X-ray diffraction analysis (XRD), Field emission scanning electron microscopy (FESEM), Transmission electron microscopy (TEM), Energy-dispersive X-ray spectroscopy (EDAX), Thermo-gravimetric analysis (TGA), Vibrating Sample Magnetometery (VSM) and Fourier-transform infrared spectroscopy (FT-IR) analysis. In this method, the batch removal process were designed by response surface methodology (RSM) based on a central composite design (CCD) model. The results indicated that the highest efficiency of Pb(II) removal was obtained from the quadratic model under optimum conditions of prominent parameters (initial pH 6.0, adsorbent dosage 7 mg, initial concentration of lead 15 mg L−1 and contact time 27.5 min). Adsorption data showed that lead ions uptake on Pip@MGO nanocomposite followed the Langmuir isotherm model equation and pseudo-second order kinetic model. High adsorption capacity (558.2 mg g−1) and easy magnetic separation capability showed that the synthesized Pip@MGO nanocomposite has great potential for the removal of Pb(II) ions from contaminated wastewaters.

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Mechanism of Cd(II) and Cu(II) Adsorption onto Few-Layered Magnetic Graphene Oxide as an Efficient Adsorbent

Cited by 40 publications

References 52 publications

A Carbonized Zeolite/Chitosan Composite as an Adsorbent for Copper (II) and Chromium (VI) Removal from Water

A Carbonized Zeolite/Chitosan Composite as an Adsorbent for Copper (II) and Chromium (VI) Removal from Water

Adsorption of Fluoride from Aqueous Solution using Eggshell Pretreated with Plasma Technology

Effective removal of Pb(II) ions using piperazine-modified magnetic graphene oxide nanocomposite; optimization by response surface methodology

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