New Facile Benign Agrogenic-Nanoscale Titania Material—Remediation Potential for Toxic Inorganic Cations
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Date
2015-03-01
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Elsevier
Abstract
A new facile benign (eco-friendly) Nauclea diderrichii agrowaste-nanoscale titania hybrid adsorbent (TND) used in the sequestration of Cr(III) and Pb(II) ions is reported in this paper. Surface characterization techniques such as thermogravimetric analysis (TG), X-ray diffractometry (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Brunauer–Emmett–Teller (BET) surface area and porosimetric analyses indicated that N. diderrichii agrowaste (NDS) was successfully modified with nano-titania. TG analysis proved that modification of N. diderrichii agrowaste with nano-titania improved its thermal stability and rate of metal ion uptake. Pseudo-second order kinetic equation gave better fit to experimental data than pseudo-first order kinetic equation. The adsorption capacity of NDS and TND adsorbents for Cr(III) were 5.57 mg/g and 6.21 mg/g, respectively. Also, the amounts of Pb(II) sequestered by NDS and TND adsorbents were 6.82 mg/g and 7.49 mg/g, respectively. Also, the initial sorption rates of Cr(III) and Pb(II) by TND adsorbent was higher than for NDS adsorbent, making TND material a better adsorbent for toxic metal ions removal from aqueous effluents than NDS adsorbent.
Description
The authors acknowledge the support of The World Academy
of Sciences for the advancement of science in developing countries
(TWAS), Italy and the Chinese Academy of Sciences (CAS), China for
providing Fellowship (FR number: 3240240234) to Dr Martins O.
Omorogie at the Laboratory for Nanodevices of the National Center
for Nanoscience and Technology, Beijing, China where this research
was done. This work was also partly supported by the National
Basic Research Program of China (973 Program No. 2011CB933401)
and the National Natural Science Foundation of China (21005023).
Professor Jian R. Gong gratefully acknowledges the support of the
K.C. Wong Education Foundation, Hong Kong.
Keywords
Biomass, Kinetics, Agrogenic-Nanoscale Titania, Chromium, Lead
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