Carboxylmethyl konjac glucomannan conjugated polydopamine composites for Pb(II) removal

Pan-Pan Chen; Hong-Ping Zhang; Jianping Ding; Xiao-Yan Lin; Xiong Lu; Changsheng Liu; Youhong Tang

doi:10.1016/j.carbpol.2017.01.048

Carboxylmethyl konjac glucomannan conjugated polydopamine composites for Pb(II) removal

Carbohydr Polym. 2017 Apr 15:162:62-70. doi: 10.1016/j.carbpol.2017.01.048. Epub 2017 Jan 15.

Authors

Pan-Pan Chen¹, Hong-Ping Zhang², Jianping Ding¹, Xiao-Yan Lin¹, Xiong Lu³, Changsheng Liu⁴, Youhong Tang⁵

Affiliations

¹ Engineering Research Center of Biomass Materials, Ministry of Education, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China.
² Engineering Research Center of Biomass Materials, Ministry of Education, School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang, Sichuan 621010, China. Electronic address: zhp1006@126.com.
³ Key Laboratory of Advanced Technologies of Materials, Ministry of Education, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610031, China.
⁴ Key Laboratory for Ultrafine Materials of Ministry of Education East China University of Science and Technology, Shanghai 200237, China.
⁵ Centre for NanoScale Science and Technology and School of Computer Science, Engineering and Mathematics, Flinders University, South Australia 5042, Australia. Electronic address: youhong.tang@flinders.edu.au.

PMID: 28224896
DOI: 10.1016/j.carbpol.2017.01.048

Abstract

Carboxylmethyl konjac glucomannan conjugated polydopamine (CMKGM-PDA) composite was successfully prepared using a cost-effective method. CMKGM-PDA exhibited excellent adsorption performance for the removal of Pb(II) and could be a convenient agent for recovery. The Langmuir linear model was suitable for describing the adsorption process of Pb(II). The maximum adsorption capacity was 95.24mgg^-1 at 298K, showing a high absorption capacity in comparison to similar absorbents. The pseudo-second order equation and intra-particle diffusion model exhibited good correlation with the adsorption kinetic. The thermodynamic values (ΔH0 > 0, ΔS0 > 0, ΔG0 < 0) indicated that the adsorption process of Pb(II) was endothermic, feasible, and spontaneous in nature. The chelation and electrostatic attraction between Pb(II) and -OH (or -NH₂) groups on the CMKGM-PDA formed a possible adsorption mechanism.

Keywords: Adsorption mechanism; CMKGM; Lead; Polydopamine.

MeSH terms

Adsorption
Environmental Restoration and Remediation / methods*
Indoles / chemistry*
Kinetics
Lead / isolation & purification*
Mannans / chemistry*
Polymers / chemistry*
Thermodynamics
Water Pollutants, Chemical / isolation & purification*

Substances

Indoles
Mannans
Polymers
Water Pollutants, Chemical
polydopamine
Lead
(1-6)-alpha-glucomannan