scholarly journals Comparison of Adsorption Capability of Activated Carbon and Metal Doped TiO2for Geosmin and 2-MIB Removal from Water

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Aisha Asghar ◽  
Zahiruddin Khan ◽  
Nida Maqbool ◽  
Ishtiaq A. Qazi ◽  
Muhammad Ali Awan
Keyword(s):  
Activated Carbon ◽  
Room Temperature ◽  
Freundlich Isotherm ◽  
Titania Nanoparticles ◽  
Contaminant Removal ◽  
Consumer Complaints ◽  
Freundlich Isotherms ◽  
Doped Titania ◽  
Metal Doped ◽  
Stock Solutions

This study stemmed from consumer complaints about earthy and musty off-flavours in treated water of Rawal Lake Filtration Plant. In recent years, several novel adsorbents have been developed from nanomaterials for enhancing the contaminant removal efficiency. This paper presents preparation and the use of new adsorbents Pt doped titania and Fe doped titania, for the adsorption capacity of Geosmin and 2-MIB from water under laboratory conditions and their comparison, with most widely used activated carbon, under batch and column experiments. Stock solutions were prepared by using Geosmin and 2-MIB standards, procured by Sigma Aldrich (England). Samples were analysed using SPME-GC-FID. The adsorption of Geosmin and 2-MIB on GAC conformed to the Freundlich isotherm, while that of adsorption on metal doped titania fit equally well to both Langmuir and Freundlich isotherms. Moreover, data, generated for the kinetic isotherm, confirmed that Geosmin and 2-MIB removal is a function of contact time. Breakthrough column tests using 125 mg/L Pt doped titania nanoparticles, coated on glass beads against 700 ng/L of off-flavours, attained later breakthrough and exhaustion points and removed 98% of Geosmin and 97% of 2-MIB at room temperature. All columns could be regenerated using 50 mL 0.1 molar sodium hydroxide.

scholarly journals Arsenic Removal from Aqueous Solution Using Pure and Metal-Doped Titania Nanoparticles Coated on Glass Beads: Adsorption and Column Studies

2013 ◽  
Vol 2013 ◽  
pp. 1-17 ◽  
Author(s):  
M. Ihsan Danish ◽  
Ishtiaq A. Qazi ◽  
Akif Zeb ◽  
Amir Habib ◽  
M. Ali Awan ◽  
...  
Keyword(s):  
Arsenic Removal ◽  
Fixed Bed ◽  
Visible Region ◽  
Glass Beads ◽  
Operating Conditions ◽  
Titania Nanoparticles ◽  
World Population ◽  
Impregnation Method ◽  
Doped Titania ◽  
Metal Doped

Nanosized metal oxide, Titania, provides high surface area and specific affinity for the adsorption of heavy metals, including arsenic (As), which is posing a great threat to the world population due to its carcinogenic nature. In this study, As(III) adsorption was studied on pure and metal- (Ag- and Fe-) doped Titania nanoparticles. The nanoparticles were synthesized by liquid impregnation method with some modifications, with crystallite size in the range of 30 to 40 nm. Band gap analysis, using Kubelka-Munk function showed a shift of absorption band from UV to visible region for the metal-doped Titania. Effect of operational parameters like dose of nanoparticles, initial As(III) concentration, and pH was evaluated at 25°C. The data obtained gave a good fit with Langmuir and Freundlich isotherms and the adsorption was found to conform to pseudo-second-order kinetics. In batch studies, over 90% of arsenic removal was observed for both types of metal-doped Titania nanoparticles from a solution containing up to 2 ppm of the heavy metal. Fixed bed columns of nanoparticles, coated on glass beads, were used for As(III) removal under different operating conditions. Thomas and Yoon-Nelson models were applied to predict the breakthrough curves and to find the characteristic column parameters useful for process design. The columns were regenerated using 10% NaOH solution.

scholarly journals Clarification of Reprocessed Syrup and Use in the Formulation of Lollipop-Type Hard Candies

2020 ◽  
Vol 10 (6) ◽  
pp. 6846-6864
Keyword(s):  
Experimental Data ◽  
Activated Carbon ◽  
Sucrose Solution ◽  
Freundlich Isotherm ◽  
Adsorptive Capacity ◽  
Suitable Model ◽  
Distilled Water ◽  
Visual Evaluation ◽  
Freundlich Isotherms ◽  
Langmuir And Freundlich Isotherms

The objective was to evaluate the removal of dye using activated carbon, and apply the best condition in the removal of candy reprocessing syrup pigment, as well as to evaluate its influence in the visual aspect of a lollipop. Adsorption capacity tests were performed with the dye diluted with and without sucrose, and from the data, the linearization of the Langmuir and Freundlich isotherms were calculated. The lollipop was prepared with syrup treated with activated carbon and visually evaluated using a panel of untrained tasters. The Freundlich isotherm adjusted more appropriately to the experimental data of the adsorption of the dye diluted in distilled water, while for the dye diluted in sucrose solution, the most suitable model was Langmuir's. The experimental design condition showed the highest adsorptive capacity (26.91 mg.g-1) for the dye diluted in the aqueous solution was at a temperature of 60 ºC and pH 5.5, while for the sucrose-diluted dye solution, was 103.09 mg.g-1, under the same conditions. The visual evaluation of the lollipop indicated the possibility of adding up to 15% of reprocessing syrup. Thus, the use of activated carbon is an alternative to remove the coloring from candy syrup and enable its reuse within the industry.

Novel silver nanoparticles/activated carbon co-doped titania nanoparticles for enhanced antibacterial activity

2020 ◽  
Vol 258 ◽  
pp. 126775 ◽  
Author(s):  
V. Poornima Parvathi ◽  
M. Umadevi ◽  
R. Sasikala ◽  
R. Parimaladevi ◽  
V. Ragavendran ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Antibacterial Activity ◽  
Activated Carbon ◽  
Titania Nanoparticles ◽  
Doped Titania ◽  
Co Doped

scholarly journals Removal of Methylene Blue Dye from Synthetic Wastewater using Kenaf Core and Activated Carbon

2018 ◽  
Vol 7 (4.19) ◽  
pp. 909 ◽  
Author(s):  
Saleem Ethaib ◽  
Iqbal K. Erabee ◽  
Ali A. Abdulsahib
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Low Cost ◽  
Correlation Coefficients ◽  
Freundlich Isotherm ◽  
Morphological Properties ◽  
Synthetic Wastewater ◽  
Blue Dye ◽  
Freundlich Isotherms ◽  
Kenaf Core

The removal of textile-based cationic methylene blue (MB) dye from synthetic wastewater was investigated in batch model using low cost agro-based adsorbents named Kenaf core, and the activated carbon. A comparative analysis between these adsorbents was defined via pH, adsorbent dose and contact time on adsorption process, and morphological properties. In addition, isotherms adsorption studies were estimated for determination of the equilibrium adsorption capacity. The experimental observation showed that the optimum pH values for Kenaf core and the activated carbon were 6 and 4 respectively. Meanwhile the optimum adsorbent dosage values for Kenaf and the activated carbon were 1.5g for both. The results showed that a high adsorption efficiency for Kenaf core which was about 84% and 92 % for activated carbon. The correlation coefficients (𝑅2) for kenaf core were equal to 0.8789 and 89 for Langmuir and Freundlich isotherm, respectively. Meanwhile, the correlation coefficients (𝑅2) for activated carbon were equal were 0.8974 and 0.7643 for Langmuir and Freundlich isotherms, respectively. The results illustrated that the Kenaf core has a porous and an irregular surface area which make it a suitable adsorbent for dyes in the wastewater. 

scholarly journals Role of Sawdust in the Removal of Iron from Aqueous Solution

2017 ◽  
Vol 23 (3) ◽  
pp. 223 ◽  
Author(s):  
H.B. Senin ◽  
O. Subhi ◽  
R. Rosliza ◽  
N. Kancono ◽  
M.S. Azhar ◽  
...  
Keyword(s):  
Experimental Data ◽  
Aqueous Solution ◽  
Langmuir Isotherm ◽  
Room Temperature ◽  
Freundlich Isotherm ◽  
Batch Test ◽  
Freundlich Isotherms ◽  
Langmuir And Freundlich Isotherms ◽  
Better Than

Sawdust, inexpensive material has been utilized as an absorbent for the removal of iron from aqueous solution for their safe disposal. The adsorption experiments of untreated sawdust (SD) and treated sawdust (SDC) have been carried out at room temperature using the batch test. The Langmuir and Freundlich isotherms were used to observe sorption phenomena of sawdust in the removal of iron. The results indicate that the sawdust was capable in removing iron in aqueous solution. The results have shown that the Langmuir isotherm was found well fitted into the experimental data as compared to the Freundlich isotherm. It was found that, chemisorptions and physisorption were the prime mechanism for the process of adsorption to occur between the sawdust and iron. The results also proved that the acid sulphuric treated sawdust is much better than that of untreated sawdust as an adsorbent for iron.

scholarly journals Metal doped Titania nanoparticles as efficient photocatalyst for dyes degradation

2020 ◽  
pp. 101312
Author(s):  
Maria Sadia ◽  
RobinaNaz ◽  
Jehangir Khan ◽  
Muhammad Zahoor ◽  
Riaz Ullah ◽  
...  
Keyword(s):  
Titania Nanoparticles ◽  
Doped Titania ◽  
Metal Doped ◽  
Dyes Degradation

scholarly journals Adsorption and Photocatalytic Mineralization of Bromophenol Blue Dye with TiO2 Modified with Clinoptilolite/Activated Carbon

Catalysts ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 7
Author(s):  
Emmanuel Kweinor Tetteh ◽  
Sudesh Rathilal
Keyword(s):  
Activated Carbon ◽  
Photocatalytic Degradation ◽  
Oxygen Demand ◽  
Freundlich Isotherm ◽  
Reaction Rate Constant ◽  
Coefficient Of Determination ◽  
Bromophenol Blue ◽  
Blue Dye ◽  
Order Kinetic ◽  
Co Precipitation

This study presents a hybridized photocatalyst with adsorbate as a promising nanocomposite for photoremediation of wastewater. Photocatalytic degradation of bromophenol blue (BPB) in aqueous solution under UV-irradiation of wavelength 400 nm was carried out with TiO2 doped with activated carbon (A) and clinoptilolite (Z) via the co-precipitation technique. The physiochemical properties of the nanocomposite (A–TiO2 and Z–TiO2) and TiO2 were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and Fourier-transform infrared (FTIR) spectroscopy. Results of the nanocomposite (A–TiO2 and Z–TiO2) efficiency was compared to that with the TiO2, which demonstrated their adsorption and synergistic effect for the removal of chemical oxygen demand (COD) and color from the wastewater. At an optimal load of 4 g, the photocatalytic degradation activity (Z–TiO2 > A–TiO2 > TiO2) was found favorably by the second-order kinetic model. Consequently, the Langmuir adsorption isotherms favored the nanocomposites (Z–TiO2 > A–TiO2), whereas that of the TiO2 fitted very well on the Freundlich isotherm approach. Z–TiO2 evidently exhibited a high photocatalytic efficacy of decomposition over 80% of BPB (COD) at reaction rate constant (k) and coefficient of determination (R2) values of 5.63 × 10−4 min−1 and 0.989, respectively.

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