scholarly journals Functionalized MWCNTs-quartzite nanocomposite coated with Dacryodes edulis stem bark extract for the attenuation of hexavalent chromium

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
James F. Amaku ◽  
Segun Ogundare ◽  
Kovo G. Akpomie ◽  
Collins U. Ibeji ◽  
Jeanet Conradie

AbstractMultiwalled carbon nanotubes/quartzite nanocomposite modified with the extract of Dacryodes edulis leaves was synthesized and designated as Q, which was applied for the removal of Cr(VI) from water. The adsorbents (PQ and Q) were characterized using the SEM, EDX, FTIR, TGA, XRD, and BET analyses. The XRD revealed the crystalline composition of the nanocomposite while the TGA indicated the incorporated extract as the primary component that degraded with an increase in temperature. The implication of the modifier was noticed to enhance the adsorption capacity of Q for Cr(VI) by the introduction of chemical functional groups. Optimum Cr(VI) removal was noticed at a pH of 2.0, adsorbent dose (50 mg), initial concentration (100 mg dm−3), and contact time (180 min). The kinetic adsorption data for both adsorbents was noticed to fit well to the pseudo-second-order model. The adsorption equilibrium data were best described by the Langmuir model. The uptake of Cr(VI) onto PQ and Q was feasible, endothermic (ΔH: PQ = 1.194 kJ mol−1 and Q = 34.64 kJ mol−1) and entropy-driven (ΔS : PQ = 64.89 J K−1 mol−1 and q = 189.7 J K−1 mol−1). Hence, the nanocomposite demonstrated potential for robust capacity to trap Cr(VI) from aqueous solution.

Author(s):  
James F. Amaku ◽  
Segun A. Ogundare ◽  
Kovo G. Akpomie ◽  
Comfort M. Ngwu ◽  
Jeanet Conradie

2020 ◽  
Vol 6 (1) ◽  
Author(s):  
Camila Gabriel Kato-Schwartz ◽  
Anacharis Babeto de Sá-Nakanishi ◽  
Ana Carolina Guidi ◽  
Geferson de Almeida Gonçalves ◽  
Fernanda Giacomini Bueno ◽  
...  

2020 ◽  
Vol 151 ◽  
pp. 01011
Author(s):  
Safrida Safrida ◽  
Mustafa Sabri

This study was designed to determine the effect of Carica papaya L. stem bark extracts on cholesterol concentration in rats induced with glibenclamide. A completely randomized design was used for the experiment which consisted of 6 treatment groups, each group consisted of four rats, as follows:1) KN (negative control, non-diabetic rats); KP, diabetic rats given glibenclamide 10 mg/kg body weight; EP 1, diabetic rats given 0 mg/kg body weight/day extract; EP2, diabetic rats given 100 mg/kg body weight/day extract; and EP3, diabetic rats given 200 mg/kg body weight/day extract, EP4, diabetic rats given 300 mg/kg body weight/day extract for 28 day. The results showed that C. papaya L. stem bark extract decreased (P<0.05) cholesterol levels in diabetic rats. It was concluded that C. papaya L. stem bark extract had potential as anti-hypercholesterolemic in diabetic rats.


2012 ◽  
Vol 5 (6) ◽  
pp. 314-321 ◽  
Author(s):  
A. Mohammed ◽  
S.B. Mada ◽  
H.M. Yakasai

2017 ◽  
Vol 9 (2) ◽  
pp. 107
Author(s):  
I. Igbe ◽  
B.A. Ayinde ◽  
S Innih ◽  
N.A. Ezeadiugwu ◽  
A. Okhuarobo

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