Issue 59, 2020, Issue in Progress
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RSC Advances

Coadsorption behaviors and mechanisms of Pb(ii) and methylene blue onto a biodegradable multi-functional adsorbent with temperature-tunable selectivity

Rongping Chen,a   Jiali Cai,a   Qing Li,b   XinYuan Wei,a   Huihua Minc  and  Qiang Yong ORCID logo *d  

* Corresponding authors

a College of Biology and Environment, Nanjing Forestry University, Nanjing 210037, P. R. China

b The Key Laboratory of Chemistry for Natural Products of Guizhou Province, Chinese Academy of Sciences, Guiyang 550014, China

c Electron Microscope Lab, Nanjing Forestry University, Nanjing 210037, P. R. China

d College of Chemical Engineering, Nanjing Forestry University, Nanjing 210037, P. R. China
E-mail: swhx@njfu.com.cn
Fax: +86-25-85427045

Abstract

An entirely bio-degradable adsorbent based on lignin was synthesized by a crosslinking method and the adsorption of methyl blue (MB) and Pb(II) onto the adsorbent were comparatively investigated, with adsorption behavior and mechanism of the two pollutants on the adsorbent (SLS) being assessed in single and binary systems. According to the results, SLS was capable of effective adsorption using MB and Pb(II). The adsorption behavior of MB and Pb(II) followed Langmuir and pseudo-first order models and showed temperature-dependent preferences. At 298 K MB was more preferred while at 318 K Pb(II) adsorption was more favorable, which means that the selectivity of SLS can be tuned by changing the temperature. From a mechanism aspect, the adsorption of MB and Pb(II) were both achieved through more than one route. Pb(II) mainly interacts with sulfonate and hydroxyl groups on SLS, while MB can be bound on both anionic and aromatic groups due to its aromatic nature. Recycling and reuse experiments showed that used SLS can be readily reactivated and stably reused. The findings will guide adsorbent applications in wastewater containing heavy metals and aromatic compounds.

Graphical abstract: Coadsorption behaviors and mechanisms of Pb(ii) and methylene blue onto a biodegradable multi-functional adsorbent with temperature-tunable selectivity

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Article information

DOI
https://doi.org/10.1039/D0RA07139K
Article type
Paper
Submitted
19 Aug 2020
Accepted
18 Sep 2020
First published
28 Sep 2020
This article is Open Access
Creative Commons BY license

RSC Adv., 2020,10, 35636-35645

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Coadsorption behaviors and mechanisms of Pb(II) and methylene blue onto a biodegradable multi-functional adsorbent with temperature-tunable selectivity

R. Chen, J. Cai, Q. Li, X. Wei, H. Min and Q. Yong, RSC Adv., 2020, 10, 35636 DOI: 10.1039/D0RA07139K

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence. You can use material from this article in other publications without requesting further permissions from the RSC, provided that the correct acknowledgement is given.

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