PMID- 25866206
OWN - NLM
STAT- MEDLINE
DCOM- 20160420
LR  - 20240109
IS  - 1090-2414 (Electronic)
IS  - 0147-6513 (Linking)
VI  - 121
DP  - 2015 Nov
TI  - Optimization, equilibrium, kinetic, thermodynamic and desorption studies on the 
      sorption of Cu(II) from an aqueous solution using marine green algae: Halimeda 
      gracilis.
PG  - 199-210
LID - S0147-6513(15)00139-6 [pii]
LID - 10.1016/j.ecoenv.2015.03.040 [doi]
AB  - The aptitude of marine green algae Helimeda gracilis for sorption of Cu(II) ions 
      from an aqueous solution was studied in batch experiments. The effect of relevant 
      parameters such as function of pH, sorbent dosage, agitation speed and contact 
      time was evaluated by using Response surface methodology (RSM). A maximum 
      percentage removal of Cu (II) by Halimeda gracilis occurs at pH-4.49, sorbent 
      dosage-1.98g/L, agitation speed-119.43rpm and contact time-60.21min. Further, the 
      sorbent was characterized by using Fourier Transform Infrared Spectroscopy (FTIR) 
      and Scanning electron microscope (SEM) analysis. Experimental data were analyzed 
      in terms of pseudo-first order, pseudo-second order, intraparticle diffusion, 
      power function and elovich kinetic models. The results showed that the sorption 
      process of Cu(II) ions followed well pseudo-second order kinetics. The sorption 
      data of Cu(II) ions at 308.15K are fitted to Langmuir, Freundlich, 
      Dubinin-Radushkevich (D-R), Temkin, Sips and Toth isotherms. Sorption of Cu(II) 
      onto marine green algae Helimeda gracilis followed the Langmuir and Toth isotherm 
      models (R(2)=0.998 and R(2)=0.999) with the maximum sorption capacity of 38.46 
      and 38.07mg/g. The calculated thermodynamic parameters such as DeltaG degrees , DeltaH degrees  and DeltaS degrees  
      showed that the sorption of Cu(II) ions onto Helimeda gracilis biomass was 
      feasible, spontaneous and endothermic. Desorption study shows that the sorbent 
      could be regenerated using 0.2M HCl solution, with up to 89% recovery.
CI  - Copyright (c) 2015 Elsevier Inc. All rights reserved.
FAU - Jayakumar, R
AU  - Jayakumar R
AD  - Environmental Engineering Laboratory, Department of Chemical Engineering, 
      Annamalai University, Annamalai Nagar, 608002 Tamilnadu, India. Electronic 
      address: harrishjk@rediffmail.com.
FAU - Rajasimman, M
AU  - Rajasimman M
AD  - Environmental Engineering Laboratory, Department of Chemical Engineering, 
      Annamalai University, Annamalai Nagar, 608002 Tamilnadu, India.
FAU - Karthikeyan, C
AU  - Karthikeyan C
AD  - Environmental Engineering Laboratory, Department of Chemical Engineering, 
      Annamalai University, Annamalai Nagar, 608002 Tamilnadu, India.
LA  - eng
PT  - Journal Article
DEP - 20150410
PL  - Netherlands
TA  - Ecotoxicol Environ Saf
JT  - Ecotoxicology and environmental safety
JID - 7805381
RN  - 0 (Ions)
RN  - 0 (Solutions)
RN  - 0 (Water Pollutants, Chemical)
RN  - 789U1901C5 (Copper)
SB  - IM
MH  - Adsorption
MH  - Biomass
MH  - Chlorophyta/*chemistry/metabolism
MH  - Copper/*isolation & purification
MH  - Environmental Restoration and Remediation/*methods
MH  - Hydrogen-Ion Concentration
MH  - Ions
MH  - Kinetics
MH  - Models, Theoretical
MH  - Solutions
MH  - Spectroscopy, Fourier Transform Infrared
MH  - Thermodynamics
MH  - Water Pollutants, Chemical/*isolation & purification
OTO - NOTNLM
OT  - Adsorption
OT  - Cu(II)
OT  - Green algae
OT  - Kinetics
OT  - RSM
OT  - Thermodynamics
EDAT- 2015/04/14 06:00
MHDA- 2016/04/21 06:00
CRDT- 2015/04/14 06:00
PHST- 2014/11/10 00:00 [received]
PHST- 2015/03/25 00:00 [revised]
PHST- 2015/03/31 00:00 [accepted]
PHST- 2015/04/14 06:00 [entrez]
PHST- 2015/04/14 06:00 [pubmed]
PHST- 2016/04/21 06:00 [medline]
AID - S0147-6513(15)00139-6 [pii]
AID - 10.1016/j.ecoenv.2015.03.040 [doi]
PST - ppublish
SO  - Ecotoxicol Environ Saf. 2015 Nov;121:199-210. doi: 10.1016/j.ecoenv.2015.03.040. 
      Epub 2015 Apr 10.