scholarly journals Modification of Activated Carbon (Prepared From Flaxseed) With Fe3O4, Its Application As Adsorbent And Antibacterial

2021 ◽  
Author(s):  
M. H. Fekri ◽  
S. Isanejad Mohamareh ◽  
M. Hosseini ◽  
M. Razavi Mehr
Keyword(s):  
Activated Carbon ◽  
Contact Time ◽  
Structural Characteristics ◽  
Antibacterial Properties ◽  
Effect Of Temperature ◽  
Maximum Efficiency ◽  
Process Conditions ◽  
Nano Composite ◽  
Initial Concentration ◽  
Central Composite

Abstract In this work, magnetic activated carbon (MGAC) was investigated to remove the antibiotic cefazolin from aqueous solutions as well as its antibacterial properties. To determine the optimal process conditions and achieve maximum efficiency, the effect of temperature, contact time, initial concentration of the drug, composite dosage, and pH using the response surface method (RSM) and the central composite design model (CCD) were investigated by DOE software. Structural characteristics and morphology of the nanocomposite were analyzed by using FTIR, XRD, EDAX, SEM, TEM, BET, TGA, VSM, analyzes. The results showed that pH = 6, the temperature of 30 ℃, contact time 150 minutes, initial concentration of drug 20 mg/l, and composite dosage 0.03 g were the best conditions for removing cefazolin from aqueous solution. In these conditions, the magnetically activated carbon was able to remove 96% of cefazolin. The Langmuir, Freundlich, and Temkin isotherms were also studied and the results showed that the absorption behavior is most consistent with the Temkin isotherm. The results of thermodynamic experiments also showed that the adsorption process is exothermic and spontaneous. Finally, the antibacterial properties of the prepared nano composite on Streptococcus and Salmonella were investigated and the results showed that the prepared sample has antibacterial properties.

scholarly journals Application of Chitosan and Activated Carbon Nano-composite in Removal of Nitrite, Phosphate, and Ammonia From Aquaculture Wastewater

2019 ◽  
Vol 6 (2) ◽  
pp. 106-112
Author(s):  
Hassan Rezaei ◽  
Saeedeh Rastegar ◽  
Sanaz Naseri
Keyword(s):  
Activated Carbon ◽  
Contact Time ◽  
Wastewater Reuse ◽  
Palm Kernel ◽  
Carbon Adsorbent ◽  
Fish Farms ◽  
Nano Composite ◽  
Effluent Concentration ◽  
Quality Of Water ◽  
Aquaculture Wastewater

Developing an adsorbent with natural components is one of the effective methods to reduce the amount of wastewater pollutants. Wastewater reuse can improve the quality of water prior to entering the natural environment. The aim of this study was to evaluate the efficiency of chitosan nano-composite and activated carbon adsorbent in the removal of nitrite, phosphate, and ammonia pollutants from fish farms of Aq-Qala. To prepare the adsorbents, the shrimp shells were converted to nano-chitosan. The date palm kernel was prepared and activated with oxalic acid in pyrolysis furnace by injecting nitrogen gas into activated carbon, then, the nano-composite was prepared from nanochitosan and activated carbon. A field-laboratory study was conducted during the winter of 2018, and then, batches of synthesized nano-composite were investigated and the effects of pH, initial effluent concentration, and adsorption time were investigated. The experiments were performed in the pH range of 5-8, effluent concentration of 25-100 mg/L, and contact time of 15-90 minutes. The results showed that at optimum conditions (pH of 7, effluent concentration of 50 mg/L, and contact time of 60 minutes), the highest removal percentage and adsorption capacity for nitrite, phosphate, and ammonia contaminants were 99.98%, 99.77%, and 65.65%, and 6.65, 6.14, and 7.32 mg/g , respectively. Due to the high removal percentage (99.98%) of the chitosan and activated carbon nano-composite, the adsorbent was highly capable of removing pollutants (nitrite, phosphate, and ammonia).

Removal of Geosmin by Powered Activated Carbon as an Emergency Method

2014 ◽  
Vol 587-589 ◽  
pp. 616-619
Author(s):  
Zheng Wang ◽  
Dong Zhang ◽  
Ping Xia ◽  
Hui Ye ◽  
Wen Qi Zhou
Keyword(s):  
Activated Carbon ◽  
Contact Time ◽  
Adsorption Efficiency ◽  
Initial Concentration ◽  
Application Point ◽  
Removal Efficiencies

The removal of geosmin by powered activated carbon (PAC) was studied at laboratory to select suitable PAC type and the removal efficiencies of geosmin by PAC in different application point as an emergency method were evaluated. The adsorption efficiency of coal-based PAC on geosmin was superior to that of bamboo-based PAC. The contact time and PAC dose were two important factors that affect the removal effect of geosmin. Geosmin could be controled below 10ng/L at 200ng/L of initial concentration.

scholarly journals Phenol removal from aqueous solution using silica and activated carbon derived from rice husk

2019 ◽  
Vol 14 (4) ◽  
pp. 897-907 ◽  
Author(s):  
Hosseinali Asgharnia ◽  
Hamidreza Nasehinia ◽  
Roohollah Rostami ◽  
Marziah Rahmani ◽  
Seyed Mahmoud Mehdinia
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Water Treatment ◽  
Organic Pollutants ◽  
Rice Husk ◽  
Contact Time ◽  
Adsorption Process ◽  
Phenol Removal ◽  
Initial Concentration ◽  
Maximum Removal

Abstract Phenol and its derivatives are organic pollutants with dangerous effects, such as poisoning, carcinogenicity, mutagenicity, and teratogenicity in humans and other organisms. In this study, the removal of phenol from aqueous solution by adsorption on silica and activated carbon of rice husk was investigated. In this regard, the effects of initial concentration of phenol, pH, dosage of the adsorbents, and contact time on the adsorption of phenol were investigated. The results showed that the maximum removal of phenol by rice husk silica (RHS) and rice husk activated carbon (RHAC) in the initial concentration of 1 mgL−1 phenol, 2 gL−1 adsorbent mass, 120 min contact time, and pH 5 (RHS) or pH 6 (RHAC) were obtained up to 91% and 97.88%, respectively. A significant correlation was also detected between increasing contact times and phenol removal for both adsorbents (p < 0.01). The adsorption process for both of the adsorbents was also more compatible with the Langmuir isotherm. The results of this study showed that RHS and RHAC can be considered as natural and inexpensive adsorbents for water treatment.

Sorption of Methylene Blue and Acid Orange 7 onto Ananas comosus Peels and Leaves Based Activated Carbon

2013 ◽  
Vol 330 ◽  
pp. 112-116 ◽  
Author(s):  
Nabilah A. Lutpi ◽  
N. Najihah Jamil ◽  
C.K. Kairulazam C.K. Abdullah ◽  
Yee Shian Wong ◽  
Soon An Ong ◽  
...  
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Contact Time ◽  
Time Effect ◽  
Ananas Comosus ◽  
Acid Orange 7 ◽  
Initial Concentration ◽  
Adsorbent Dosage ◽  
Acid Orange ◽  
Percentage Removal

The adsorption of Methylene Blue (MB) and Acid Orange 7 (AO7) dye onto Ananas Comosus Mixed Peels and Leaves (ACMPL) were carried out by conducting four different parameters such as initial concentration, pH, dosage of adsorbent, and contact time. Effect of initial concentration for both dyes showed that higher initial concentration would take longer contact time to attain equilibrium due to higher amount of adsorbate molecules. The effect of pH showed highest percentage removal for MB is at pH 9 which is 95.81%. Meanwhile for AO7 the highest percentage removal is 31.06% at pH 3. The percentage removal of MB had reached the equilibrium at dosage 0.5g while AO7 keep increasing with the increment of adsorbent dosage. The percentage removal of MB and AO7 had increased until hour 2.5 which was from 72.5% to 86.93% and 19.441% to 36.89% respectively and reached equilibrium at 3 hour contact time.

scholarly journals Adsorption Ability of Cephalexin onto the Straw-Based Activated Carbon: Performance and Mechanism

2020 ◽  
Vol 32 (8) ◽  
pp. 2084-2090
Author(s):  
Lam Van Tan ◽  
Hong-Tham Nguyen Thi ◽  
To-Uyen Dao Thi ◽  
Nguyen Thi Thuy Hong
Keyword(s):  
Activated Carbon ◽  
Adsorption Capacity ◽  
Contact Time ◽  
Bet Surface Area ◽  
Surface Material ◽  
Adsorption Ability ◽  
Initial Concentration ◽  
Carbon Performance ◽  
Adsorbent Materials ◽  
Performance And Mechanism

A straw-activated carbon has been successfully synthesized with the high BET surface area, at 494.9240 m2/g, which is perfectly suitable for the adsorption of cephalexin antibiotic from aqueous water. It is noted that the adsorption capacity of straw-activated carbon is demonstrated by the effect of initial concentration, contact time, pH solution and dosage. The straw-activated carbon exhibited improved decontaminant efficiency towards cephalexin antibiotics. Quick and improved sorption could be attributable to the distinctive structural and compositional merits as well as the synergetic contribution of functional groups to surface material. Most interestingly, the adsorption capacity achieved at pH 6 was ~98.52%. A mechanism adsorption has been proposed to demonstrate adsorption of the straw-activated carbon (AC-S). By comparison with other studies, it is confirmed that AC-S in this study obtained a higher removal efficiency than other adsorbent materials, suggesting that straw-activated carbon may be an appropriate candidate to treat cephalexin from wastewater media

scholarly journals Activated Carbon and Ozone to Reduce Simazine in Water

Water ◽  
2020 ◽  
Vol 12 (10) ◽  
pp. 2900
Author(s):  
Alejandro Aldeguer Esquerdo ◽  
Pedro José Varo Galvañ ◽  
Irene Sentana Gadea ◽  
Daniel Prats Rico
Keyword(s):  
Activated Carbon ◽  
Contact Time ◽  
Advanced Oxidation Processes ◽  
Powdered Activated Carbon ◽  
Carbon Powder ◽  
Combined Treatments ◽  
Initial Concentration ◽  
Oxidation Processes ◽  
By Products ◽  
Granulated Activated Carbon

In this study, the reduction of the pesticide simazine at an initial concentration of 0.7 mg L−1 in water has been investigated using two different technologies: adsorption with powdered and granulated activated carbon, advanced oxidation processes with ozone and finally, the combination of both technologies. The results obtained for a carbon dose of 16 mg L−1 show that powdered activated carbon, with contact times of 60 min, obtained 81% of reduction and in 24 h 92%, while granulated activated carbon at 60 min obtained a reduction of 2%, rising to 34% after 24 h of contact time. Therefore, powdered activated carbon achieves better reductions compared to granulated; when ozone was applied at a dose of 19.7 mg L−1, with a reaction time of 18 min, a reduction of 93% was obtained, achieving a better reduction in less time than with adsorption treatments; however, during oxidation, by-products of simazine were produced. In the combined treatments, with the same doses of carbon and ozone mentioned above, the treatment that starts with ozone followed by activated carbon powder is recommended due to the adsorption in the last phase reaching a 90% reduction of the simazine and its by-products in 38 min of time.

scholarly journals Study Into Dynamic Behaviour of the Methylene Blue Adsorption on Activated Carbon

2021 ◽  
Vol 29 (48) ◽  
pp. 105-113
Author(s):  
Alica Pastierová ◽  
Maroš Sirotiak
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Contact Time ◽  
Dynamic Behaviour ◽  
Time Effect ◽  
Adsorption Kinetic ◽  
Optimum Conditions ◽  
Methylene Blue Adsorption ◽  
Initial Concentration ◽  
Pseudo Second Order

Abstract This paper presents a study into dynamic behaviour of the methylene blue adsorption (MB) on activated carbon. Effect of four parameters were studied: effect of the adsorbent dosage, effect of contact time, effect of pH, and effect of the initial concentration of methylene blue. The adsorption kinetic data were modelled using the pseudo-first and pseudo-second orders. Results show that, based on the experimental data, the pseudo-second order could be considered satisfactory. Thermodynamic parameters proved that adsorption of dye was spontaneous owing to increase in temperature and endothermic nature. Taguchi method was applied to determine the optimum conditions for removal of methylene blue by activated carbon. The optimum conditions were found to be pH = 7, contact time 60 min, initial concentration of MB 4 mg/L.

scholarly journals A novel activated carbon prepared from grapefruit peel and its application in removal of phenolic compounds

2018 ◽  
Vol 77 (10) ◽  
pp. 2517-2527 ◽  
Author(s):  
Xiao Liu ◽  
Yibei Wan ◽  
Penglei Liu ◽  
Yanzhen Fu ◽  
Weihua Zou
Keyword(s):  
Activated Carbon ◽  
Phenolic Compounds ◽  
Contact Time ◽  
Order Kinetic ◽  
Initial Concentration ◽  
Bet Analysis ◽  
Order Kinetic Model ◽  
Grapefruit Peel ◽  
Pseudo Second Order ◽  
Activating Agent

Abstract The most ideal conditions for preparing activated carbon from grapefruit peel (GPAC) were studied using NH4H2PO4 as a chemical activating agent and the obtained material was characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR) and Brunauer–Emmett–Teller (BET) analysis. The adsorption capacity of the resulting material has been checked using three phenolic compounds (pyrocatechol (CA), 4-chlorophenol (4-CP) and 2,4-dichlorophenol (2,4-DCP)). The adsorption characteristics of phenolic compounds from aqueous solution by GPAC have been investigated as a function of contact time, pH, initial concentration and temperature. The equilibrium experimental data fitted well with Freundlich and Koble–Corrigan isotherms. The adsorption of the three phenolic compounds on GPAC fitted well with pseudo-second-order kinetic model. Different thermodynamic parameters were also evaluated and it was found that the adsorption was spontaneous, feasible and endothermic in nature. Adsorbents were regenerated by 0.1 mol/L NaOH and GPAC could be reused in phenolic compounds removal.

An Eco-Friendly Procedure for Preparation of Activated Carbon as a Capture Material of Heavy Metals in Wastewater

2020 ◽  
Vol 12 (8) ◽  
pp. 1157-1163
Author(s):  
Foziah F. Al-Fawzan
Keyword(s):  
Electron Microscopy ◽  
Heavy Metals ◽  
Activated Carbon ◽  
Contact Time ◽  
Heavy Elements ◽  
Surface Scanning ◽  
Dried Fruits ◽  
Initial Concentration ◽  
Synthetic Adsorbents ◽  
Scanning Electron

This study aims to prepare an activated carbon from environmentally and inexpensive materials such as banana peels. The synthetic activated carbon has been employed in the capture of heavy elements e.g., copper (Cu), zinc (Zn) and cadmium (Cd) ions from wastewater. The spectroscopic (Fourier-transform infrared; FTIR) and morphological surface (scanning electron microscopy; SEM) investigations of the activated carbon were assigned. Adsorption of mentioned heavy metals upon the activated carbon studies were performed with different parameters such as effect of contact time, initial concentration of the heavy metal and pH (2–10) of the solution. A comparison of the adsorption capacity of the synthetic activated carbon (dried banana peels) with different adsorbents previously used (dried fruits peels) for Cu(II), Zn(II) and Cd(II) ions removal from wastewater streams shows its observable efficiency over many other treated and untreated natural and synthetic adsorbents. The Cu(II) ions showed the highest removal efficiency followed by Cd(II) then Zn(II) ions.

scholarly journals Application of Central Composite Design in the Adsorption of Ca(II) on Metakaolin Zeolite

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Upenyu Guyo ◽  
Lycenter Yard Phiri ◽  
Fidelis Chigondo
Keyword(s):  
Central Composite Design ◽  
Correlation Coefficient ◽  
Contact Time ◽  
Adsorption Process ◽  
Freundlich Isotherm ◽  
Zeolite A ◽  
Chi Square ◽  
Initial Concentration ◽  
Excel Solver ◽  
Central Composite

Metakaolin zeolite-A was synthesized from thermally activated kaolin clay and characterized by Fourier Transform Infrared Spectroscopy and X-Ray Diffraction Spectroscopy. The effects of pH (2–10), contact time (10–180 min), initial concentration (5–120 mgL−1), and dosage (0.1–2 g) and their interactions were investigated using response surface methodology following a central composite design. Optimum removal (87.70%) was obtained at pH 6, contact time 180 min, initial concentration 40.0 mgL−1, and adsorbent dosage 1.0 g by Excel Solver using the GRG solving method. The adsorption data fitted best to the Langmuir model with correlation coefficient R2=0.993 and Chi-square value χ2=4.76. The Freundlich isotherm gave a correlation coefficient R2=0.933 and χ2=37.91. The adsorption process followed the pseudo-second-order model. The calculated thermodynamic parameters showed that the adsorption process was endothermic and not thermodynamically spontaneous. The studied zeolite-A can therefore be used as a promising adsorbent for the removal of Ca(II) ions from aqueous solutions.

Sign in / Sign up

Export Citation Format

Share Document