2,4-D herbicide adsorption analysis by powdered activated carbon and chitosan

Name: Laís Bisi Maú
Type: MSc dissertation
Publication date: 24/08/2022

Namesort descending Role
Edumar Ramos Cabral Coelho Advisor *

Examining board:

Namesort descending Role
Edumar Ramos Cabral Coelho Advisor *
Gilberto Maia de Brito External Examiner *
Ricardo Franci Gonçalves Internal Examiner *

Summary: The purpose of this study was evaluate and compare the adsorption of the 2,4-D
herbicide in water by powder activated carbon and chitosan between kinetics and
isotherms adsorption analysis. There were used four adsorbents: commercial activated
carbon from coconut shell (CAC), laboratory produced activated carbon from
microalgae origin from wastewater treatment plant (CAM), commercial chitosan from
crustaceans (QUIC) and laboratory produced chitosan from crab shell (QUIU). The
adsorbents were characterized by specific superficial area, thermal gravimetric
analysis, infrared spectroscopy, scanning electron microscopy, X-ray diffraction and
nuclear magnetic resonance techniques, in order to get data about the specific
superficial area, distribution and porous volume, humidity rate, ashes rate, volatile
materials rate, fixed carbon, functional groups, superficial structure, crystalline
structure and organic structure, respectively. The values of specific superficial area
found for the activate carbon samples were 625,5 m².g-1
for the CAC sample and 621,2
for the CAM sample, while for the chitosan samples were 3,11 m².g-1
for the
QUIC sample and 0,66 m².g-1
for the QUIU sample. Pseudo-first order, Pseudo-second
order and Elovich Kinect models were applied in order to study the effect of contact
time between adsorbent-adsorbate during adsorption. For evaluate adsorption
capacity of each sample there were applied Langmuir, Freundlich, Temkin and
Dubinin-Radushkevich isotherm models were applied and compared to each other.

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