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Konu Konu: Activated carbon prepared from coconut sh Yanıt YazYeni Konu Gönder
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Kayıt Tarihi: 2021-13-Ocak
Aktif Durum: Pasif
Gönderilenler: 30
Gönderen: 2021-15-Ocak Saat 05:44 | Kayıtlı IP Alıntı dingxinda

Adsorptive removal of parachlorophenol (PCP) and 2,4,6-
trichlorophenol (TCP) from aqueous solutions by activated
carbon prepared from coconut
shellcoconut
carbon
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,pellets.com/">bulk activated carbon respectively.
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