PMID- 31494517
OWN - NLM
STAT- MEDLINE
DCOM- 20191015
LR  - 20221207
IS  - 1095-8630 (Electronic)
IS  - 0301-4797 (Linking)
VI  - 249
DP  - 2019 Nov 1
TI  - Study on highly efficient Cr(VI) removal from wastewater by sinusoidal 
      alternating current coagulation.
PG  - 109322
LID - S0301-4797(19)31024-2 [pii]
LID - 10.1016/j.jenvman.2019.109322 [doi]
AB  - Cr(IV) pollution in water leads to serious environmental contamination and health 
      risks. Among various wastewater treating methods, electrocoagulation (EC) is 
      widely applied because of its high efficiency. However, there is still a problem 
      of high energy consumption that has to be solved by direct current coagulation 
      (DCC). In this paper, a sinusoidal alternating current coagulation (SACC) 
      technique was used to reduce energy consumption and improve the efficiency of 
      Cr(VI) removal. The effects of pH value, current density, initial concentration 
      of Cr(VI) and reaction time are studied on the removal of Cr(VI). The response 
      surface methodology (RSM) was used to optimize the parameters of SACC process. 
      Compared with pulse direct current coagulation (PDCC) and DCC, SACC can greatly 
      reduce the concentration polarization and prevent Fe electrodes from passivation 
      so as to reduce energy consumption and improve the efficiency of Cr(VI) removal. 
      When pH 5.6 wastewater containing 33.1 mg⋅dm(-3) Cr(VI) was treated by applying 
      2.7 A⋅m(-2) density for 20.5 min, the removal rate of Cr(VI) reached 99.73%, and 
      the residual Cr(VI) in the effluent was <0.1 mg⋅dm(-3). The power consumption of 
      SACC process decreases by 14.98% compared to DCC process and the electrode loss 
      is about 16.4% less than that of the DCC. The coagulation produced by SACC has a 
      large specific surface area and better adsorption performance through analysis of 
      SEM and EDS as well as adsorption dynamic analysis. FTIR and XRD patterns 
      verified the strong interaction between Cr(VI) and iron sol. The Cr(VI) on the 
      electrode can be deposited as a form of insoluble Cr(III) compounds. Langmuir 
      adsorption isotherm model and the second-order kinetic model in SACC are more 
      suitable to explain the adsorption behavior and characteristics of Cr(VI) in 
      SACC.
CI  - Copyright (c) 2019 Elsevier Ltd. All rights reserved.
FAU - Xu, Tao
AU  - Xu T
AD  - Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and 
      Chemical Engineering, Hunan University, Changsha, 410082, China.
FAU - Zhou, Yihui
AU  - Zhou Y
AD  - Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and 
      Chemical Engineering, Hunan University, Changsha, 410082, China.
FAU - Lei, Xiping
AU  - Lei X
AD  - Hunan Zihong Ecology Technology Co., Ltd, Changsha, 410082, China.
FAU - Hu, Bonian
AU  - Hu B
AD  - Department of Materials and Chemical Engineering, Hunan Institute of Technology, 
      Hengyang, 421008, China. Electronic address: hbonian@163.com.
FAU - Chen, Hong
AU  - Chen H
AD  - School of Materials Science and Energy Engineering, Foshan University, Foshan, 
      528000, China. Electronic address: chenhongcs@126.com.
FAU - Yu, Gang
AU  - Yu G
AD  - Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and 
      Chemical Engineering, Hunan University, Changsha, 410082, China. Electronic 
      address: yuganghnu@163.com.
LA  - eng
PT  - Journal Article
DEP - 20190905
PL  - England
TA  - J Environ Manage
JT  - Journal of environmental management
JID - 0401664
RN  - 0 (Waste Water)
RN  - 0 (Water Pollutants, Chemical)
RN  - 0R0008Q3JB (Chromium)
RN  - 18540-29-9 (chromium hexavalent ion)
SB  - IM
MH  - Adsorption
MH  - Chromium
MH  - Hydrogen-Ion Concentration
MH  - *Wastewater
MH  - *Water Pollutants, Chemical
OTO - NOTNLM
OT  - Chromium(VI)
OT  - Electrocoagulation
OT  - Iron electrode
OT  - Sinusoidal alternating current (SAC)
OT  - Wastewater
EDAT- 2019/09/09 06:00
MHDA- 2019/10/16 06:00
CRDT- 2019/09/09 06:00
PHST- 2019/03/22 00:00 [received]
PHST- 2019/06/10 00:00 [revised]
PHST- 2019/07/25 00:00 [accepted]
PHST- 2019/09/09 06:00 [pubmed]
PHST- 2019/10/16 06:00 [medline]
PHST- 2019/09/09 06:00 [entrez]
AID - S0301-4797(19)31024-2 [pii]
AID - 10.1016/j.jenvman.2019.109322 [doi]
PST - ppublish
SO  - J Environ Manage. 2019 Nov 1;249:109322. doi: 10.1016/j.jenvman.2019.109322. Epub 
      2019 Sep 5.