PMID- 32763574
OWN - NLM
STAT- MEDLINE
DCOM- 20201207
LR  - 20201214
IS  - 1879-1298 (Electronic)
IS  - 0045-6535 (Linking)
VI  - 262
DP  - 2021 Jan
TI  - Preparation of highly dispersive and antioxidative nano zero-valent iron for the 
      removal of hexavalent chromium.
PG  - 127733
LID - S0045-6535(20)31928-7 [pii]
LID - 10.1016/j.chemosphere.2020.127733 [doi]
AB  - In this study, carboxymethyl cellulose (CMC) was employed to stabilize 
      zero-valent iron nanoparticles (CMC-nFe(0)) to improve their dispersity and 
      antioxidation for enhanced hexavalent chromium (Cr(VI)) removal. Scanning 
      electron microscope (SEM) observation revealed that the nFe(0) agglomerated in 
      clusters, while the CMC-nFe(0) connected as chains and presented higher 
      dispersity. Therefore, compared with 54% of the nFe(0), the Cr(VI) removal rate 
      of the CMC-nFe(0) increased by 0.8 time, reaching 97%. Besides, the nFe(0) 
      precipitated in 1 d and was obviously oxidized within 7 d under anoxic condition, 
      leading to a rapid decease of Cr(VI) removal efficiency from 54% to 3% in 56 d. 
      In contrast, the CMC-nFe(0) showed no obvious subsidence and oxidized phenomenon 
      within 14 d, which retained a relatively high Cr(VI) removal efficiency of 63% in 
      56 d, contributing to effective blockage of dissolved oxygen infiltrating from 
      solution to nFe(0) particles in presence of CMC. After reaction, the valence 
      state distribution of Cr between solution and material surface indicated that 
      Cr(VI) reduction was dominant comparing to physical adsorption to particles in 
      the remediation process conducted by CMC-nFe(0). In addition, lower initial pH 
      and higher iron dosage facilitated Cr(VI) removal. Those results indicated that 
      the dispersive and antioxidative characteristics of CMC-nFe(0) were significantly 
      superior to those of nFe(0), and CMC stabilization thereafter can be a promising 
      method to promote Cr(VI) elimination by nFe(0).
CI  - Copyright (c) 2020 Elsevier Ltd. All rights reserved.
FAU - Wu, Jinhua
AU  - Wu J
AD  - School of Environment and Energy, South China University of Technology, 
      Guangzhou, 510006, China. Electronic address: jinhuawu@scut.edu.cn.
FAU - Yan, Mingjia
AU  - Yan M
AD  - School of Environment and Energy, South China University of Technology, 
      Guangzhou, 510006, China.
FAU - Lv, Sihao
AU  - Lv S
AD  - School of Chemistry and Environmental Engineering, Dongguan University of 
      Technology, Dongguan, 523808, China.
FAU - Yin, Weizhao
AU  - Yin W
AD  - School of Environment, Jinan University, Guangzhou, 510632, China.
FAU - Bu, Huaitian
AU  - Bu H
AD  - SINTEF Industry, Department of Materials and Nanotechnology, Forskningsveien 1, 
      0373, Oslo, Norway.
FAU - Liu, Li
AU  - Liu L
AD  - School of Environment and Energy, South China University of Technology, 
      Guangzhou, 510006, China.
FAU - Li, Ping
AU  - Li P
AD  - School of Environment and Energy, South China University of Technology, 
      Guangzhou, 510006, China.
FAU - Deng, Hong
AU  - Deng H
AD  - School of Environment and Energy, South China University of Technology, 
      Guangzhou, 510006, China.
FAU - Zheng, Xiangyu
AU  - Zheng X
AD  - School of Environment and Energy, South China University of Technology, 
      Guangzhou, 510006, China; The Key Laboratory of Pollution Control and Ecosystem 
      Restoration in Industry Clusters, Ministry of Education, Guangzhou, 510006, 
      China; The Key Laboratory of Environmental Protection and Eco-Remediation of 
      Guangdong Regular Higher Education Institutions, Guangzhou, 510006, China.
LA  - eng
PT  - Journal Article
DEP - 20200801
PL  - England
TA  - Chemosphere
JT  - Chemosphere
JID - 0320657
RN  - 0 (Antioxidants)
RN  - 0 (Water Pollutants, Chemical)
RN  - 0R0008Q3JB (Chromium)
RN  - 18540-29-9 (chromium hexavalent ion)
RN  - E1UOL152H7 (Iron)
RN  - K679OBS311 (Carboxymethylcellulose Sodium)
RN  - S88TT14065 (Oxygen)
SB  - IM
MH  - Adsorption
MH  - Antioxidants/*chemistry
MH  - Carboxymethylcellulose Sodium/chemistry
MH  - Chromium/chemistry/*isolation & purification
MH  - Hydrogen-Ion Concentration
MH  - Iron/*chemistry
MH  - Metal Nanoparticles/chemistry
MH  - Microscopy, Electron, Scanning
MH  - Oxidation-Reduction
MH  - Oxygen
MH  - Water Pollutants, Chemical/chemistry/*isolation & purification
OTO - NOTNLM
OT  - Antioxidation
OT  - Carboxymethyl cellulose
OT  - Chromium
OT  - Dispersity
OT  - Zero-valent iron
COIS- Declaration of competing interest The authors declare that they have no known 
      competing financial interests or personal relationships that could have appeared 
      to influence the work reported in this paper.
EDAT- 2020/08/09 06:00
MHDA- 2020/12/15 06:00
CRDT- 2020/08/09 06:00
PHST- 2020/05/08 00:00 [received]
PHST- 2020/07/11 00:00 [revised]
PHST- 2020/07/14 00:00 [accepted]
PHST- 2020/08/09 06:00 [pubmed]
PHST- 2020/12/15 06:00 [medline]
PHST- 2020/08/09 06:00 [entrez]
AID - S0045-6535(20)31928-7 [pii]
AID - 10.1016/j.chemosphere.2020.127733 [doi]
PST - ppublish
SO  - Chemosphere. 2021 Jan;262:127733. doi: 10.1016/j.chemosphere.2020.127733. Epub 
      2020 Aug 1.