PMID- 26339902
OWN - NLM
STAT- MEDLINE
DCOM- 20160520
LR  - 20181113
IS  - 1932-6203 (Electronic)
IS  - 1932-6203 (Linking)
VI  - 10
IP  - 9
DP  - 2015
TI  - Enhanced Coagulation-Flocculation Performance of Iron-Based Coagulants: Effects 
      of PO4(3-) and SiO3(2-) Modifiers.
PG  - e0137116
LID - 10.1371/journal.pone.0137116 [doi]
LID - e0137116
AB  - PO4(3-) and SiO3(2-) are often used as modifier to improve stability and 
      aggregating ability of the iron-base coagulants, however, there are few reports 
      about their detailed comparison between the coagulation performance and 
      mechanisms. In this study, three coagulants--polyferric phosphoric sulfate 
      (PFPS), polysilicon ferric sulfate (PFSS), and polyferric sulfate (PFS) were 
      synthesized; their structure and morphology were characterized by Fourier 
      transformed infrared (FT-IR) spectroscopy, X-ray diffraction (XRD) and Scanning 
      electron microscope (SEM). Alkali titration and Ferron species analysis were 
      employed to investigate the hydrolysis performance and species distribution. Jar 
      test was conducted to measure their coagulation behaviors at different dosage, 
      pH, and temperatures in which the flocs properties were measured. The results 
      showed that a number of new compounds were formed due to the presence of PO4(3-) 
      and SiO3(2-). Moreover, PFPS and PFSS had similar level in Fea as well as Feb. 
      Among them, PFPS produced more multi-core iron atoms polymer and content of Feb, 
      and the formed flocs were larger and denser. It exhibited superior coagulation 
      performance in terms of turbidity reduction, UV254 removal and residual ferric 
      concentration. Jar test and floc breakage/regrowth experiments indicated other 
      than charge neutrality, the dominated mechanism involved in PFSS was the 
      adsorption between polysilicic acid and solution particle, while PFPS was 
      sweeping, entrapment/adsorption resulting from larger polymer colloid of Fe-P 
      chemistry bond.
FAU - Chen, Wei
AU  - Chen W
AD  - Key laboratory of the Three Gorges Reservoir Region's Eco-Environment, State 
      Ministry of Education, Chongqing University, Chongqing, China; National Centre 
      for International Research of Low-carbon and Green Buildings, Chongqing 
      University, Chongqing, China.
FAU - Zheng, Huaili
AU  - Zheng H
AD  - Key laboratory of the Three Gorges Reservoir Region's Eco-Environment, State 
      Ministry of Education, Chongqing University, Chongqing, China; National Centre 
      for International Research of Low-carbon and Green Buildings, Chongqing 
      University, Chongqing, China.
FAU - Teng, Houkai
AU  - Teng H
AD  - National Research Center of Industrial Water Treatment Engineering and 
      Technology, Tianjin Chemical Research and Design Institute, Tianjin, China.
FAU - Wang, Yili
AU  - Wang Y
AD  - Research Center for Water Pollution Source Control and Eco-remediation, Beijing 
      Forestry University, Beijing, China.
FAU - Zhang, Yuxin
AU  - Zhang Y
AD  - State Key Laboratory of Urban and Regional Ecology, Research Center for 
      Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, China.
FAU - Zhao, Chuanliang
AU  - Zhao C
AD  - Key laboratory of the Three Gorges Reservoir Region's Eco-Environment, State 
      Ministry of Education, Chongqing University, Chongqing, China; National Centre 
      for International Research of Low-carbon and Green Buildings, Chongqing 
      University, Chongqing, China.
FAU - Liao, Yong
AU  - Liao Y
AD  - Key laboratory of the Three Gorges Reservoir Region's Eco-Environment, State 
      Ministry of Education, Chongqing University, Chongqing, China; National Centre 
      for International Research of Low-carbon and Green Buildings, Chongqing 
      University, Chongqing, China.
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20150904
PL  - United States
TA  - PLoS One
JT  - PloS one
JID - 101285081
RN  - 0 (Coagulants)
RN  - 0 (Ferric Compounds)
RN  - 0 (Humic Substances)
RN  - 0 (Silicon Compounds)
RN  - 0 (Suspensions)
RN  - 24H4NWX5CO (Kaolin)
RN  - 3HWS7HF5XD (ferric sulfate)
SB  - IM
MH  - Adsorption
MH  - Coagulants/*chemistry
MH  - Ferric Compounds/*chemistry
MH  - Flocculation
MH  - Fresh Water/chemistry
MH  - Humic Substances/*analysis
MH  - Hydrogen-Ion Concentration
MH  - Kaolin/*isolation & purification
MH  - Nephelometry and Turbidimetry/methods
MH  - Silicon Compounds/*chemistry
MH  - Suspensions
MH  - Water Purification/methods
PMC - PMC4560378
COIS- Competing Interests: The authors have declared that no competing interests exist.
EDAT- 2015/09/05 06:00
MHDA- 2016/05/21 06:00
PMCR- 2015/09/04
CRDT- 2015/09/05 06:00
PHST- 2015/03/06 00:00 [received]
PHST- 2015/08/12 00:00 [accepted]
PHST- 2015/09/05 06:00 [entrez]
PHST- 2015/09/05 06:00 [pubmed]
PHST- 2016/05/21 06:00 [medline]
PHST- 2015/09/04 00:00 [pmc-release]
AID - PONE-D-15-10006 [pii]
AID - 10.1371/journal.pone.0137116 [doi]
PST - epublish
SO  - PLoS One. 2015 Sep 4;10(9):e0137116. doi: 10.1371/journal.pone.0137116. 
      eCollection 2015.