Abstract
The adsorption capacity of steam activated carbon prepared from Delonix regia pods SADRC for adsorption of Aniline Blue (AB) from aqueous solution was investigated under various experimental conditions. Batch study was conducted to assess the potential of the activated carbon for the removal of Aniline Blue from aqueous solution. Activated carbon prepared from Delonix regia pods was characterized using Scanning Electron Microscope (SEM) and Fourier Transform Infrared (FTIR) Spectrophotometry before and after adsorption. The FTIR, spectra of SADRC pod before and after Aniline Blue adsorption were compared to study the impact of the Aniline Blue on the activated carbon developed from the Delonix regia pod. The stretching vibration band at 2169.54 cm-1 may be due to strong CN, while the stretching vibration band at around 1580 - 1650 cm-1 may be due to C=C stretching vibration. The bands around 1350 and 426.49 cm-1 are due to C-N and –SO3H group, respectively; this further suggests that some functional groups may be present on the surface of the carbon due to the low temperature of carbonization (300°C) of the adsorbent. Equilibrium isotherm studies were carried out by varying the following four parameters: initial concentration of Aniline Blue dye solution, solution pH and adsorbent dose. The equilibrium data obtained were more fitted to Langmuir than Freundlich isotherm models. The correlation coefficient value (R2) of the pseudo first order kinetics ranged from 0.08 to 0.85 while the R2 of the pseudo second order kinetics ranged from 0.963 to 0.997 at all the temperatures and initial concentrations considered. This suggests that the adsorption kinetics of Aniline Blue onto SADRC can be represented with pseudo second order kinetic model. This study showed that Delonix regia pod could be effectively used as an adsorbent for the removal of Aniline Blue from aqueous solutions over a wide range of concentration and temperature.
Highlights
The impact of dyes present in water streams has being of environmental concern on the quality of such water and the aquatic animals within the water as well as its immediate surroundings
The Fourier Transform Infrared (FTIR) spectra of steam activated Delonix regia carbon (SADRC) before and after Aniline Blue adsorption onto the activated carbon developed from the Delonix regia pod (SADRC), were compared
The FTIR spectra before adsorption were in the range of 418 to 2370.81 cm−1 (Figure 1), while spectra after adsorption ranged from 426.49 and 1560 cm−1 (Figure 2), and these changes suggested that Aniline Blue adsorbed onto the SADRC
Summary
The impact of dyes present in water streams has being of environmental concern on the quality of such water and the aquatic animals within the water as well as its immediate surroundings. These dyes are persistent in nature and absorbed sunlight, which are very important for basic activities such as photosynthesis that sustain the aquatic lives in the water stream. The discharge of dye-contaminated wastewater, into natural streams and rivers, is mainly sourced from industries such as textile, paper, carpet, and others, which use dyes and pigments to colour their products. Ingestion of Aniline Blue results in some adverse reactions in certain organs of the human [3]; contact with external organs like eyes results in severe irritation [4] while inhalation gives rise to difficulty in breathing [5]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
