Environmental remediation of selenium using surface modified carbon nano tubes - Characterization, influence of variables, equilibrium and kinetic analysis

Rajamohan, N.; Bosu, Subrajit; Varjani, Sunita

doi:10.1016/j.envres.2022.114629

Cited by 16 publications

(3 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The temperature affected the q of the APMFS-AC with the 135-min sonication, and the rising adsorption temperature from 27°C to 45°C lifted it up by 67.069%. In addition, the Langmuir models confirmed that a single layer on the activated carbon should correspond to a pseudo second order model (Rajamohan et al, 2023).…”

Section: (B)mentioning

confidence: 63%

Adsorption of Cu(II) from Aqueous Solution on Sonicated Activated Carbon Prepared from Arenga Pinnata Merr Fruit Shell Waste: Isotherm, Kinetic and Thermodynamic Studies

Said,

Muslim,

Yahya

et al. 2023

EREM

View full text Add to dashboard Cite

Adsorption of Cu(II) from aqueous solution on the activated carbon (AC) prepared from Arenga pinnata Merr fruit shell (APMFS) waste with the assistance of ultrasound was evaluated by conducting batch mode experiments. As a result, KOH activation using 40 kHz of ultrasound restructured active binding sites and produced more pores on the APMFS-AC according to FT-IR and SEM analyses, respectively. Increasing the sonication time from 45 min to 135 min increased the adsorption capacity from 6.535 mg/g to 7.042 mg/g, respectively, at the initial Cu(II) concentration of 257.213 mg/L, 27°C and pH 5. With an increment of the adsorption temperature to 45°C, it increased the adsorption capacity up to 11.765 mg/g. The investigation on the independent variables showed the optimum conditions of adsorption which were 257.213 mg/L of the initial Cu(II) concentration, 60 min of contact time, pH 5 and 45°C using 135 min of sonicated APMFS-AC. The Cu(II) adsorption isotherm was fitted with the Langmuir model at the optimum condition. The Langmuir mono-layer adsorption capacity obtained was 11.765 mg/g with the BET saturation capacity, and the total pore volume values were 13.029 mg/g and 3.987 L/mg, respectively. The Cu(II) adsorption followed the pseudo second-order kinetics model with the adsorption rate 0.473 g/mg.min. Thermodynamic parameters of enthalpy change (∆H0, 27.035 kJ/mol), Gibbs free energy (∆G0, 7.292 kJ/mol), entropy change (∆S0, 0.062 kJ/mol.K), and activation energy (E, 22.637 kJ/mol) were determined. These results confirmed that endothermic, spontaneous and chemical adsorption took place.

show abstract

Section: (B)mentioning

confidence: 63%

Adsorption of Cu(II) from Aqueous Solution on Sonicated Activated Carbon Prepared from Arenga Pinnata Merr Fruit Shell Waste: Isotherm, Kinetic and Thermodynamic Studies

Said,

Muslim,

Yahya

et al. 2023

EREM

View full text Add to dashboard Cite

show abstract

“…Kinetic modeling was employed to predict the appropriate rate expressions for reaction mechanisms and estimate the rate of contaminant removal from aqueous effluents through sorption. Similar to batch equilibrium studies, kinetic parameters were evaluated, and different contact times were employed to assess the applicability of the investigated kinetic models 18 . The optimal kinetic models that best matched the experimental data were selected based on error functions, including the nonlinear chi-square (X 2 ) and the linear coefficient of determination(R 2 ) 19 .…”

Section: Methodsmentioning

confidence: 99%

Artificial intelligence models for methylene blue removal using functionalized carbon nanotubes

Mijwel,

Ahmed,

Afan

et al. 2023

Sci Rep

View full text Add to dashboard Cite

This study aims to assess the practicality of utilizing artificial intelligence (AI) to replicate the adsorption capability of functionalized carbon nanotubes (CNTs) in the context of methylene blue (MB) removal. The process of generating the carbon nanotubes involved the pyrolysis of acetylene under conditions that were determined to be optimal. These conditions included a reaction temperature of 550 °C, a reaction time of 37.3 min, and a gas ratio (H2/C2H2) of 1.0. The experimental data pertaining to MB adsorption on CNTs was found to be extremely well-suited to the Pseudo-second-order model, as evidenced by an R2 value of 0.998, an X2 value of 5.75, a qe value of 163.93 (mg/g), and a K2 value of 6.34 × 10–4 (g/mg min).The MB adsorption system exhibited the best agreement with the Langmuir model, yielding an R2 of 0.989, RL value of 0.031, qm value of 250.0 mg/g. The results of AI modelling demonstrated a remarkable performance using a recurrent neural network, achieving with the highest correlation coefficient of R2 = 0.9471. Additionally, the feed-forward neural network yielded a correlation coefficient of R2 = 0.9658. The modeling results hold promise for accurately predicting the adsorption capacity of CNTs, which can potentially enhance their efficiency in removing methylene blue from wastewater.

show abstract

“…Many scientists worked on the removal of heavy metal ions such as lead, cadmium, selenium, and etc. using various adsorbents, especially porous magnetic nanocomposites, and modified carbon nanotubes 18,19 . The list of hypercrosslinked polymers (HCPs) for the elimination of metallic ions is presented in Table 1.…”

mentioning

confidence: 99%

Hypercrosslinked waste polycarbonate to remove heavy metal contaminants from wastewater

Masoumi,

Ghaemi

2024

Sci Rep

View full text Add to dashboard Cite

In this research, the waste polycarbonate was hypercrosslinked during the Friedel–Crafts reaction to eliminate metallic ions from the wastewater solution. The experiments for inspecting the adsorption behavior of lead and cadmium ions were conducted at the initial concentration of 20–100 mg/L, contact time of 10–80 min, temperature of 20–80 °C, and pH of 6–11. The isotherm, kinetic, and thermodynamic models have been used to explain the behavior of the metal ions removal process. The correlation coefficient and adsorption capacity of the kinetic model for cadmium ion have obtained 0.995 and 160.183 mg/g, respectively, and the correlation coefficient and adsorption capacity of the kinetic model for lead ion has obtained 0.998 and 160.53 mg/g, respectively, which declared that the cascade was not monolayer. The correlation coefficient of the Freundlich is calculated at 0.995 and 0.998 for Cd and Pb, respectively, indicating the resin plane was not homogenized. The n constant for cadmium and lead ions has been calculated at 2.060 and 1.836, respectively, confirming that the resin is not homogenized, and the process has performed well. Afterward, the values of enthalpy and Gibbs free energy changes were obtained at − 7.68 kJ/mol and − 0.0231 kJ/mol.K for lead ions, respectively, which implies the exothermic and spontaneous state of the process. The values of enthalpy and Gibbs free energy changes have been obtained at − 6.62 kJ/mol and − 0.0204 kJ/mol.K for cadmium ions, respectively, which implies the exothermic and spontaneous nature of the adsorption. Also, the optimal empirical conditions for lead and cadmium ions have been found at a time of 60 min, temperature of 20 °C, initial concentration of 100 mg/L, and pH of 10. At a time of 45 min, the diffusion coefficient and mass transfer coefficient for lead ions have been calculated at 0.1269 × 1020 m2/s and 0.2028 × 1015 m/s, respectively. In addition, at a time of 45 min, the diffusion coefficient and mass transfer coefficient for cadmium ions have been calculated at 0.1463 × 1020 m2/s and 0.1054 × 1015 m/s, respectively. Moreover, the mechanism study explains that the C–O–C and C–H in the aromatic groups have a crucial aspect in the bond formation among metallic ions and resin.

show abstract

Environmental remediation of selenium using surface modified carbon nano tubes - Characterization, influence of variables, equilibrium and kinetic analysis

Cited by 16 publications

References 46 publications

Adsorption of Cu(II) from Aqueous Solution on Sonicated Activated Carbon Prepared from Arenga Pinnata Merr Fruit Shell Waste: Isotherm, Kinetic and Thermodynamic Studies

Adsorption of Cu(II) from Aqueous Solution on Sonicated Activated Carbon Prepared from Arenga Pinnata Merr Fruit Shell Waste: Isotherm, Kinetic and Thermodynamic Studies

Artificial intelligence models for methylene blue removal using functionalized carbon nanotubes

Hypercrosslinked waste polycarbonate to remove heavy metal contaminants from wastewater

Contact Info

Product

Resources

About