PMID- 16806675
OWN - NLM
STAT- MEDLINE
DCOM- 20070126
LR  - 20131121
IS  - 0304-3894 (Print)
IS  - 0304-3894 (Linking)
VI  - 138
IP  - 1
DP  - 2006 Nov 2
TI  - Adsorptive removal of chlorophenols from aqueous solution by low cost 
      adsorbent--Kinetics and isotherm analysis.
PG  - 116-24
AB  - Adsorptive removal of parachlorophenol (PCP) and 2,4,6-trichlorophenol (TCP) from 
      aqueous solutions by activated carbon prepared from coconut shell was studied and 
      compared with activated carbon of commercial grade (CAC). Various chemical agents 
      in different concentrations were used (KOH, NaOH, CaCO(3), H(3)PO(4) and ZnCl(2)) 
      for the preparation of coconut shell activated carbon. The coconut shell 
      activated carbon (CSAC) prepared using KOH as chemical agent showed high surface 
      area and best adsorption capacity and was chosen for further studies. Batch 
      adsorption studies were conducted to evaluate the effect of various parameters 
      such as pH, adsorbent dose, contact time and initial PCP and TCP concentration. 
      Adsorption equilibrium reached earlier for CSAC than CAC for both PCP and TCP 
      concentrations. Under optimized conditions the prepared activated carbon showed 
      99.9% and 99.8% removal efficiency for PCP and TCP, respectively, where as the 
      commercially activated carbon had 97.7% and 95.5% removal for PCP and TCP, 
      respectively, for a solution concentration of 50mg/L. Adsorption followed 
      pseudo-second-order kinetics. The equilibrium adsorption data were analysed by 
      Langmuir, Freundlich, Redlich-Peterson and Sips model using non-linear regression 
      technique. Freundlich isotherms best fitted the data for adsorption equilibrium 
      for both the compounds (PCP and TCP). Similarly, acidic pH was favorable for the 
      adsorption of both PCP and TCP. Studies on pH effect and desorption revealed that 
      chemisorption was involved in the adsorption process. The efficiency of the 
      activated carbon prepared was also tested with real pulp and paper mill effluent. 
      The removal efficiency using both the carbons were found highly satisfactory and 
      was about 98.7% and 96.9% as phenol removal and 97.9% and 93.5% as AOX using CSAC 
      and CAC, respectively.
FAU - Radhika, M
AU  - Radhika M
AD  - Centre for Environmental Studies, Anna University, Chennai 600025, India.
FAU - Palanivelu, K
AU  - Palanivelu K
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
DEP - 20060522
PL  - Netherlands
TA  - J Hazard Mater
JT  - Journal of hazardous materials
JID - 9422688
RN  - 0 (Chlorophenols)
RN  - 0 (Industrial Waste)
RN  - 0 (Water Pollutants, Chemical)
RN  - 16291-96-6 (Charcoal)
RN  - 3DLC36A01X (4-chlorophenol)
RN  - 55X04QC32I (Sodium Hydroxide)
RN  - MHS8C5BAUZ (2,4,6-trichlorophenol)
SB  - IM
MH  - Adsorption
MH  - Charcoal/*chemistry
MH  - Chlorophenols/*isolation & purification
MH  - Cocos/*chemistry
MH  - Hydrogen-Ion Concentration
MH  - Industrial Waste
MH  - Kinetics
MH  - Sodium Hydroxide/chemistry
MH  - Thermodynamics
MH  - Waste Disposal, Fluid/economics/*methods
MH  - Water Pollutants, Chemical/*isolation & purification
EDAT- 2006/06/30 09:00
MHDA- 2007/01/27 09:00
CRDT- 2006/06/30 09:00
PHST- 2006/03/01 00:00 [received]
PHST- 2006/05/13 00:00 [revised]
PHST- 2006/05/15 00:00 [accepted]
PHST- 2006/06/30 09:00 [pubmed]
PHST- 2007/01/27 09:00 [medline]
PHST- 2006/06/30 09:00 [entrez]
AID - S0304-3894(06)00517-6 [pii]
AID - 10.1016/j.jhazmat.2006.05.045 [doi]
PST - ppublish
SO  - J Hazard Mater. 2006 Nov 2;138(1):116-24. doi: 10.1016/j.jhazmat.2006.05.045. 
      Epub 2006 May 22.