期刊
CHEMOSPHERE
卷 197, 期 -, 页码 20-25出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2018.01.022
关键词
Sodium carboxymethyl cellulose; Nanoscaled zinc oxide; Methylene blue; Sorption; Degradation; Hydroxyl radical
资金
- National Natural Science Foundation of China [41771349, 31772394]
- Guangdong Provincial Key Laboratory of Environmental Pollution Control and Remediation Technology
- Laboratory Research Fund from Key Laboratory of Original Agro-Environmental Pollution Prevention and Control, Ministry of Agriculture/Tianjin Key Laboratory of Agro-environment and Safe-product
- Startup Fund for distinguished scholars of Yangzhou University [5016/137011014]
- Industry-University-Research-Application Cooperative Innovation Key Program of Yangling Agricultural Hi-tech Industries Demonstration Zone [2017CXY-10]
Biochar(BC)-supported nanoscaled zinc oxide (nZO) was encapsulated either with (nZORc/BC) or with no (nZOR/BC) sodium carboxymethyl cellulose (CMC). The X-ray diffraction and ultraviolet (UV)-visible-near infrared spectrophotometry revealed that nZO of 16, 10, and 20 nm with energy band gaps of 2.79, 3.68 and 2.62 eV were synthesized for nZOR/BC, nZORc/BC and nZO/BC, respectively. The Langmuir isotherm predicted saturated sorption of methylene blue (MB) was 17.01 g kg(-1) for nZORc/BC, over 19 times greater than nZOR/BC and nZO/BC. Under UV irradiation, 10.9, 61.6, 83.1, and 41.6% of MB were degraded for nZORc/BC, nZO/BC, nZOR/BC and BC. The scavenging experiment revealed hydroxyl radical dominated CMC degradation. Exogenous CMC (2 g L-1) increased MB sorption from 10.6% to 73.1%, but decreased MB degradation from 80.7% to 41.1%, relative to nZOR/BC. Thus, CMC could increase MB sorption by electrostatic attraction and other possible mechanisms. The compromised MB degradation may be ascribed to reduced availability of hydroxyl and superoxide radicals to degrade MB, and increased band gap energy of ZnO. (C) 2018 Published by Elsevier Ltd.
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