Chemical pretreatments of Trapa bispinosa's peel (TBP) biosorbent to enhance adsorption capacity for Pb(ll) release_rev_f07907de-6568-421d-b411-0704026a60bd

by Muhammad Nadeem Zafar, Muzna Saeed, Raziya Nadeem, Sajjad Hussain Sumrra, Syed Salman Shafqat, Muhammad Abdul Qayyum

Published in Open Chemistry by Walter de Gruyter GmbH.

2019   Volume 17, p325-336

Abstract

<jats:title>Abstract</jats:title> In this study, <jats:italic>Trapa bispinosa's</jats:italic> peel (TBP) biomass is exploited as an effective, low cost and new adsorbent to remove Pb(II) from aqueous solution. TBP is pretreated and modified with HNO<jats:sub>3</jats:sub>, HClO<jats:sub>4</jats:sub> and H<jats:sub>2</jats:sub>O<jats:sub>2</jats:sub> to enhance the Pb(II) removal and it is perceived that chemical modifications enhance the adsorption capacity of TBP. The adsorption behavior of Pb(II) is studied under different conditions, including pH (3-6), TBP dose (0.050.8 g), stirring speed (100-200 rpm), initial Pb(II) ion concentration (25-400 mg L<jats:sup>-1</jats:sup>) and contact time (0-1440 min). Kinetic study reveals sorption is fast in first 15 to 30 min achieving equilibrium in 60 min with q<jats:sup>max</jats:sup> (mg g<jats:sup>-1</jats:sup>) are 77.09, 105.40 and 123.82 for NT-TBP, NA-TBP and HCA-TBP respectively. The Langmuir model successfully defines the sorption data having higher R<jats:sup>2</jats:sup> and good agreement between theoretical and experimental uptake capacity of Pb(II). The kinetic study exhibits that the pseudo-second order rate equation is better portrayed sorption process. TBP modified with HClO<jats:sub>4</jats:sub> shows the highest metal uptake in comparison to HNO<jats:sub>3</jats:sub>, H<jats:sub>2</jats:sub>O<jats:sub>2</jats:sub> modified TBP and native TBP.
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Date   2019-04-24
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