Adsorption of 4-Nitrophenol (PNP) Using Pilli Nut Shell Active Carbon

Nwosu, Friday Onyekwere; Adekola, F. A.; Salami, Ayobami

doi:10.21743/pjaec/2017.06.07

Cited by 7 publications

(16 citation statements)

References 20 publications

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“…Thus, these values imply that the atrazine is more strongly adsorbed on the UBC surface than that of 2-ABC and 2-BBC, indicating that there is a stronger interaction between atrazine and the respective bentonite clays. Similar results have been reported as per the adsorption of N-nitrophenol using Pili nut shell-derived active carbon (Nwosu et al 2017). They reported B T value of 24.292 and A T value of 0.162.…”

Section: Temkin Adsorption Isothermsupporting

confidence: 88%

“…It decreased from 230.2 to 29.73 mg/g, from 283 to 74.37 mg/g and from 263.5 to 50.74 mg/g for UBC, 2-ABC and 2-BBC, respectively, when adsorbent dose increased from 0.05 to 0.35 g. Thus, for the remainder of the research, adsorbent dose of 0.1 g was used as the optimized adsorbent dose. This is similar to adsorbent dose reported in the adsorption process of PNP using active carbon from coconut husk (Nwosu et al 2017).…”

Section: Influence Of Various Factors On Amount Of Atrazine Uptakesupporting

confidence: 86%

“…Therefore, the rate of atrazine molecules that travels from the bulk solution to the particle surface increases. Similar trends have been reportedly observed in the adsorption of P-nitrophenol using active carbon produced from different precursors that are known (Nwosu et al 2017). Further increase in adsorbate brought a slight decrease in the amount of adsorbed, and thus, concentrations of 800 mg/L, 1100 mg/L and 1100 mg/L were chosen as equilibrium concentration for UBC, 2-ABC and 2-BBC, respectively.…”

Section: Influence Of Various Factors On Amount Of Atrazine Uptakesupporting

confidence: 78%

“…It can be seen from this figure that the amount adsorbed decreases with increasing temperature for the three adsorbents, indicating the apparent exothermic nature of the adsorption process. In the liquid phase, an increase in temperature commonly increases the solubility of the molecules and their diffusion within the pores of the adsorbent materials is hampered, and hence, at higher temperature adsorbed molecules tend to desorb suggesting physisorption (Nwosu et al 2017, Tang et al 2007. The adsorption capacity of UBC decreased from 120.25 to 106.1 mg/g, for 2-ABC adsorption capacity decreased from 122.35 to 107.2 mg/g, and for 2-BBC adsorption capacity decreased from 120.9 to 118 mg/g; the temperature increases from 308 to 333 k.…”

Section: Influence Of Various Factors On Amount Of Atrazine Uptakementioning

confidence: 99%

“…The economical cost of active carbon made scientist to search for the development of adsorbents from cheaper raw materials. These include biochar prepared from tamarind nut (Nwosu et al 2017) for the removal of triazine compounds. Therefore, the preparations of good adsorbents via clay such as bentonite for removal of different concentration of atrazine molecule become important.…”

Section: Introductionmentioning

confidence: 99%

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Adsorption of atrazine from aqueous solution using unmodified and modified bentonite clays

2018

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Properties of raw bentonite clay of Afuze in Edo state which are abundant and cheap bentonite mineral in Nigeria as adsorbents for the removal of atrazine in aqueous solution were investigated. The bentonite clay-types were characterized using scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectrophotometry and X-ray diffraction (XRD). Batch adsorption experiments were carried out to determine the equilibrium characteristics, thermodynamics and kinetics of the sorption processes. The data obtained were subjected to Langmuir, Freundlich and Temkin isotherm equations, while pseudo-first-order, pseudo-second-order rate equations, intra-particle diffusion and Elovich models were considered for kinetics and mechanism. The results showed that the adsorption processes were described by different isotherm models; they were all spontaneous (∆G ranges from − 938.34 to − 6263.58 kJ/mol) and exothermic (range of ∆H is − 252.73 to − 1057.08 kJ/mol), and with decreased randomness, ∆S (− 3.110 to − 0.581 J.mol/K). Pseudo-second-order kinetics model gave the better fit for all the sorption processes which implies physisorption process as the rate limiting step. Thus, bentonite clay-types can be used to adsorb atrazine.

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Section: Temkin Adsorption Isothermsupporting

confidence: 88%

Section: Influence Of Various Factors On Amount Of Atrazine Uptakesupporting

confidence: 86%

Section: Influence Of Various Factors On Amount Of Atrazine Uptakesupporting

confidence: 78%

Section: Influence Of Various Factors On Amount Of Atrazine Uptakementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Adsorption of atrazine from aqueous solution using unmodified and modified bentonite clays

2018

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Adsorption of chlorotriazine herbicide onto unmodified and modified kaolinite: Equilibrium, kinetic and thermodynamic studies

Nwosu

Ajala

Okeola

et al. 2019

Egyptian Journal of Aquatic Research

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Removal of Eriochrome Black T dye from aqueous solution using base activated typha grass (Typha latifolia) as an adsorbent

Ayuba¹,

Sani²

2022

Bayero J. Pure App. Sci.

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Adsorption of Eriochrome Black T (EBT) dye from aqueous solution by activated typha grass (T. latifolia) was studied using batch system. The adsorbent was characterized by Fourier transform infrared spectroscopy (FTIR), Scanning Electron Microscopy (SEM) methods, as well as the point of zero charge (PZC). Adsorption parameters including effect of contact time, adsorbent dose, initial dye concentration and pH were studied and the adsorption capacity (qe) was found to be 47.619mg/g. The adsorption isotherm for the adsorption processes were also modelled and evaluated and the data fitted Freundlich isotherm model with R2 of 0.9943 relative to other models tested. The kinetic data were best described by pseudo-second order model with R2 values of 0.999 and rate constant (k) of 6.30mol-1dm3s-1 out of the four models tested. The thermodynamic quantities of the adsorption process including the entropy change (ΔS) which describe the degree of disorderliness of the dye-adsorbent interphase was found to be 2.108Jmol- 1K-1 indicating an increase in the interphase disorderliness, the enthalpy change (ΔH) describing the nature of energetic interaction between the dye molecules and the adsorbent surface has a value of -9.223kJmol-1 proving an exothermic process and the Gibbs free energy change (ΔG) of the range -8.563 to -8.718kJmol-1 were obtained indicating the process to be feasible and spontaneous in nature. Hence, the activated carbon produced from typha grass can be a potential adsorbent for the removal of hazardous dyes such as Eriochrome Black T from industrial effluent.

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Adsorption of 4-Nitrophenol (PNP) Using Pilli Nut Shell Active Carbon

Cited by 7 publications

References 20 publications

Adsorption of atrazine from aqueous solution using unmodified and modified bentonite clays

Adsorption of atrazine from aqueous solution using unmodified and modified bentonite clays

Adsorption of chlorotriazine herbicide onto unmodified and modified kaolinite: Equilibrium, kinetic and thermodynamic studies

Removal of Eriochrome Black T dye from aqueous solution using base activated typha grass (Typha latifolia) as an adsorbent

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