期刊
JOURNAL OF CLEANER PRODUCTION
卷 145, 期 -, 页码 25-34出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2017.01.038
关键词
Duckweed; Pb2+ adsorption; Isotherm; Kinetics
资金
- Chengdu University, China
- State Ocean Administration Grant, China [201305022]
- Shenzhen Knowledge and Innovation Basic Research Grant [JCYJ20160122151433832]
- PhD Start-up Fund of the Natural Science Foundation of Guangdong Province, China [2014A030310326]
Lead contamination has become a serious issue and approaches are continuously searched for lead removal. Here, dried biomasses of Landoltia punctata and Spirodela polyrhiza were utilized as adsorbent for Pb2+ removal. Batch experiments were conducted to investigate effects of contact time, initial pH, temperature, stirring speed, adsorbent dosage, and initial Pb2+ concentrations on Pb2+ adsorption. Results showed that all these parameters had significant effect on Pb2+ removal efficiency of the adsorbents. Both the adsorption processes followed the pseudo-second-order kinetic model, and were well described by Langmuir isotherm. Spectroscopy analysis indicated the involvement of functional groups (-OH, C-N, C=O, N-H and C-O) in Pb2+ adsorption. Remarkably, the maximum Pb2+ adsorption capacity of L punctata and S. polyrhiza were 250 and 200 mg g(-1) (dry weight), respectively. Thus, it could be concluded that the dried biomass of L punctata and S. polyrhiza are promising adsorbents for effective lead removal. (C) 2017 Elsevier Ltd. All rights reserved.
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