PMID- 31602598
OWN - NLM
STAT- MEDLINE
DCOM- 20200710
LR  - 20200710
IS  - 1614-7499 (Electronic)
IS  - 0944-1344 (Linking)
VI  - 27
IP  - 20
DP  - 2020 Jul
TI  - Batch and continuous studies on the removal of heavy metals from aqueous solution 
      using biosynthesised melanin-coated PVDF membranes.
PG  - 24723-24737
LID - 10.1007/s11356-019-06310-8 [doi]
AB  - Heavy metals like mercury, chromium, lead and copper present in groundwater at 
      lower concentrations cause severe health issues and can even be fatal when 
      consumed. The biopigment/biopolymer melanin can be reaped from different sources 
      like bacterium, fungus, and human hair. It has excellent heavy metal ion 
      scavenging property and can be exploited for non-biological applications, 
      substantially including water purification. In this work, melanin nanoparticles 
      were derived from the marine bacterium Pseudomonas stutzeri and were coated onto 
      hydrophobic polyvinylidene fluoride (PVDF) membrane as a support, for batch and 
      continuous removal of heavy metal studies. Batch studies on the effect of pH, 
      temperature and adsorbate dose and continuous adsorption studies on the effect of 
      flow rate, adsorbate and adsorbent mass loadings were carried out by using 
      biosynthesised melanin-coated PVDF membranes for the removal of Hg(II), Cr(VI), 
      Pb(II) and Cu(II). Scanning electron microscope (SEM) images revealed the surface 
      morphology, Fourier-transform infrared spectroscopy (FTIR) and energy-dispersive 
      X-ray spectroscopy (EDS) deciphered the chemical characteristics of 
      melanin-coated PVDF membranes before and after adsorption. Contact angle 
      measurement confirmed the improvement in hydrophilicity of PVDF membrane upon 
      coating with melanin. The maximum removal percentages of heavy metals achieved by 
      melanin-coated PVDF membranes under batch mode operation were 87.6%, 88.45%, 
      91.8% and 95.8% for mercury, chromium, lead and copper, respectively optimised at 
      318 K and pH of 3 for chromium and 5 for other metals. However, the continuous 
      mode of operation with a flow rate of 0.5 mL/min having 1 mg/L of heavy metal 
      solution concentration exposed to 50 mg of melanin loading with a working volume 
      of 200 mL showed better removal efficiencies compared with batch mode. The 
      dynamic studies using Thomas and Yoon-Nelson models described the transient stage 
      of the breakthrough curve and the model constants were calculated for column 
      design and scale-up.
FAU - Manirethan, Vishnu
AU  - Manirethan V
AD  - Department of Chemical Engineering, National Institute of Technology Karnataka, 
      Mangalore, 575025, India.
FAU - Gupta, Niharika
AU  - Gupta N
AD  - Department of Chemical Engineering, National Institute of Technology Karnataka, 
      Mangalore, 575025, India.
FAU - Balakrishnan, Raj Mohan
AU  - Balakrishnan RM
AD  - Department of Chemical Engineering, National Institute of Technology Karnataka, 
      Mangalore, 575025, India. rajmohanbala@gmail.com.
FAU - Raval, Keyur
AU  - Raval K
AD  - Department of Chemical Engineering, National Institute of Technology Karnataka, 
      Mangalore, 575025, India.
LA  - eng
GR  - DST/TSG/WP/2014/58/Department of Science and Technology, Ministry of Science and 
      Technology/
PT  - Journal Article
DEP - 20191010
PL  - Germany
TA  - Environ Sci Pollut Res Int
JT  - Environmental science and pollution research international
JID - 9441769
RN  - 0 (Melanins)
RN  - 0 (Metals, Heavy)
RN  - 0 (Polyvinyls)
RN  - 0 (Water Pollutants, Chemical)
RN  - 0R0008Q3JB (Chromium)
RN  - 24937-79-9 (polyvinylidene fluoride)
SB  - IM
MH  - Adsorption
MH  - Chromium
MH  - Hydrogen-Ion Concentration
MH  - Kinetics
MH  - Melanins
MH  - *Metals, Heavy
MH  - Polyvinyls
MH  - Spectroscopy, Fourier Transform Infrared
MH  - *Water Pollutants, Chemical
OTO - NOTNLM
OT  - Adsorption
OT  - Biosynthesised melanin
OT  - Heavy metals
OT  - PVDF membrane
EDAT- 2019/10/12 06:00
MHDA- 2020/07/11 06:00
CRDT- 2019/10/12 06:00
PHST- 2019/02/15 00:00 [received]
PHST- 2019/08/26 00:00 [accepted]
PHST- 2019/10/12 06:00 [pubmed]
PHST- 2020/07/11 06:00 [medline]
PHST- 2019/10/12 06:00 [entrez]
AID - 10.1007/s11356-019-06310-8 [pii]
AID - 10.1007/s11356-019-06310-8 [doi]
PST - ppublish
SO  - Environ Sci Pollut Res Int. 2020 Jul;27(20):24723-24737. doi: 
      10.1007/s11356-019-06310-8. Epub 2019 Oct 10.