scholarly journals A comprehensive study on adsorption behavior of some azo dyes from aqueous solution onto different adsorbents

2017 ◽  
Vol 76 (2) ◽  
pp. 478-489 ◽  
Author(s):  
Nihan Kaya
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Azo Dyes ◽  
Binding Capacity ◽  
Agricultural Wastes ◽  
Walnut Shell ◽  
Isotherm Models ◽  
Adsorption Parameters ◽  
Dye Pollutants ◽  
Comprehensive Study

One of the major environmental problems is the existence of dye materials in water sources. This pollutant must be removed from water by appropriate methods. Although most of these methods are efficient for the treatment of waters contaminated with dye pollutants, they are very costly and commercially unattractive. Adsorption is one of the most popular methods for the removal of dye pollutants from water especially if the sorbent is inexpensive. Sorbents are classified as natural sorbents, commercial sorbents, and the sorbents obtained from industrial and agricultural wastes. Although commercial activated carbon is widely used in wastewater treatment applications, it is very expensive. In this study, usability of inexpensive materials – sepiolite as a natural adsorbent, and walnut shell and hazelnut shell as agricultural wastes – was investigated instead of commercial activated carbon to remove some azo dyes (methyl red, methyl orange and methyl yellow) from aqueous solution. Batch experiments were carried out to determine the effect of different adsorption parameters such as pH, initial dye concentration, contact time, adsorbent dose and temperature. The equilibrium of adsorptions was modeled using Langmuir and Freundlich isotherm models. This comprehensive study showed that these alternative adsorbents had sufficient binding capacity to remove these azo dyes from water.

scholarly journals Kinetic and thermodynamic studies on the adsorption of Cu2+ ions from aqueous solution by using agricultural waste-derived biochars

2020 ◽  
Vol 20 (8) ◽  
pp. 3120-3140
Author(s):  
Nihan Kaya ◽  
Ferhat Arslan ◽  
Zeynep Yıldız Uzun ◽  
Selim Ceylan
Keyword(s):  
Aqueous Solution ◽  
Copper Ions ◽  
Agricultural Waste ◽  
Experimental Results ◽  
Walnut Shell ◽  
Isotherm Models ◽  
Batch Adsorption ◽  
Adsorption Parameters ◽  
Mixing Speed ◽  
Hazelnut Shell

Abstract In this study, it was aimed to investigate the adsorption properties of the biochars obtained by pyrolysis of hazelnut and walnut shells for removal of copper ions from aqueous solutions. The characterization of raw biomasses and also biochars were performed using TGA-DTG, FT-IR, BET, SEM, partial and elemental analysis techniques. The optimum conditions were determined by investigating the effect of adsorption parameters (initial concentration, temperature, adsorbent amount, pH, contact time and mixing speed) for efficient removal of copper ions from aqueous solution by batch adsorption experiments carried out under different conditions. The highest adsorption efficiencies were recorded as 82 and 86% respectively for hazelnut and walnut shell biochars at pH 4, Co = 15 ppm, adsorbent dosage = 3 g/L and mixing speed = 600 rpm. Experimental results showed that the adsorption efficiency for copper ions increased with the increase of temperature (T = 45 °C) in studies only using biochar obtained from hazelnut shell. While the time of equilibrium in the aqueous solution containing copper ions was determined to be 75 min for walnut shell char, this duration was 30 min for hazelnut shell char. The experimental results were investigated in terms of Langmuir, Freundlich and Temkin isotherm models. Together with the calculated thermodynamic parameters, the adsorption mechanism was explained. In order to determine the kinetic model of the adsorption process, the experimental data were applied to pseudo first-order, pseudo second-order and intra-particle diffusion models, and the model constants were investigated.

scholarly journals Uptake of Pb(II) ion From Aqueous Solution Using Silk Cotton Hull Carbon: An Agricultural Waste Biomass

2006 ◽  
Vol 3 (4) ◽  
pp. 218-229 ◽  
Author(s):  
R. Shanmugavalli ◽  
P. S. Syed Shabudeen ◽  
R. Venckatesh ◽  
K. Kadirvelu ◽  
S. Madhavakrishnan ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Metal Ion ◽  
Agricultural Waste ◽  
Raw Material ◽  
Ion Concentration ◽  
Isotherm Models ◽  
Agricultural Product ◽  
Waste Biomass ◽  
Adsorption Parameters

Activated carbon prepared from silk cotton hull (SCH) was used for the adsorptive removal of Pb(II) ion from aqueous solution. The raw material used for the preparation of activated carbon is the waste of agricultural product; the production of this carbon is expected to be economically feasible. Parameters such as agitation time, metal ion concentration, adsorbent dose,pH and Particle size were studied. Adsorption equilibrium was reached within 80 min for 10, 20, 30 and 40mg/l of Pb(II) ion with 50mg of carbon per mL of solution. Adsorption parameters were determined using both Langmuir and Freundlich isotherm models. The adsorption efficiency reached 100% for 20, 30 and 40mg/l of Pb(II) ion with 120, 140 and 150mg of carbon. Pb(II) ion removal increased as thepH increased from 2 to 5 and remains constant up topH 10. Desorption studies were also carried out with dilute hydrochloric acid to know the mechanism of adsorption. Quantitative desorption of Pb(II) ion from carbon indicates that adsorption of metal ion is by ion-exchange. Efficiency of the adsorption of SCH was also studied with Pb containing industrial wastewater by varyingpH and carbon concentration.

Nanoparticle Fe3O4 magnetized activated carbon from Armeniaca sibirica shell for the adsorption of Hg(II) ions

BioResources ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. 6100-6120
Author(s):  
Yinan Hao ◽  
Yanfei Pan ◽  
Qingwei Du ◽  
Xudong Li ◽  
Ximing Wang
Keyword(s):  
Activated Carbon ◽  
Adsorption Capacity ◽  
Ph Value ◽  
Removal Rate ◽  
Freundlich Isotherm ◽  
Entropy Change ◽  
Isotherm Models ◽  
Order Kinetic ◽  
Adsorption Parameters ◽  
Initial Concentration

Armeniaca sibirica shell activated carbon (ASSAC) magnetized by nanoparticle Fe3O4 prepared from Armeniaca sibirica shell was investigated to determine its adsorption for Hg2+ from wastewater. Fe3O4/ASSAC was characterized using XRD (X-ray diffraction), FTIR (Fourier transform infrared spectroscopy), SEM (scanning electron microscopy), and BET (Brunauer–Emmett–Teller). Optimum adsorption parameters were determined based on the initial concentration of Hg2+, reaction time, reaction temperature, and pH value in adsorption studies. The experiment results demonstrated that the specific surface area of ASSAC decreased after magnetization; however the adsorption capacity and removal rate of Hg2+ increased 0.656 mg/g and 0.630%, respectively. When the initial concentration of Hg2+ solution was 250 mg/L and the pH value was 2, the adsorption time was 180 min and the temperature was 30 °C, and with the Fe3O4/ASSAC at 0.05 g, the adsorption reaching 97.1 mg/g, and the removal efficiency was 99.6%. The adsorption capacity of Fe3O4/ASSAC to Hg2+ was in accord with Freundlich isotherm models, and a pseudo-second-order kinetic equation was used to fit the adsorption best. The Gibbs free energy ΔGo < 0，enthalpy change ΔHo < 0, and entropy change ΔSo < 0 which manifested the adsorption was a spontaneous and exothermic process.

scholarly journals Removal of nitrate from synthetic aqueous solution and groundwater in a continuous pilot system using chemical activated carbon derived from walnut shell

2016 ◽  
Vol 11 (4) ◽  
pp. 784-795 ◽  
Author(s):  
Abolghasem Alighardashi ◽  
Shooza Shahali
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Average Pore Size ◽  
Fixed Bed ◽  
Walnut Shell ◽  
Maximum Adsorption Capacity ◽  
Average Pore ◽  
Langmuir Adsorption ◽  
Bet Specific Surface Area ◽  
Nitrate Adsorption

Excessive nitrate in the water impose a danger to human health and contribute to eutrophication. The present continuous fixed bed pilot study was carried out using granular activated carbon made from walnut shell for removal of nitrate from aqueous solution and natural groundwater. The carbon was characterized using SEM, FTIR and BET. The BET specific surface area and average pore size before nitrate adsorption were 1434.6 m2g−1 and 2.08 nm, respectively, and after were 633.28 m2g−1 and 2.04 nm, respectively. Optimum removal of nitrate was achieved at a contact time of 2 min, pH of 6.5 and a nitrate concentration of 200 mg/l. The hydraulic loading rate was calculated to be 10 m3/h.m2 and the maximum adsorption capacity using the Langmuir adsorption isotherm model (R2 = 0.99) was 10 mg NO3/g. These experiments were also carried out using groundwater and the removal of nitrate decreased from 68% to 60% because of competition with other cations and anions.

scholarly journals Adsorption of selected azo dyes from an aqueous solution by activated carbon derived from Monotheca buxifolia waste seeds

2020 ◽  
Vol 15 (No. 3) ◽  
pp. 166-172 ◽  
Author(s):  
Ruqia Nazir ◽  
Muslim Khan ◽  
Riaz Ur Rehman ◽  
Shaukat Shujah ◽  
Mansoor Khan ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Azo Dyes ◽  
Solution Ph ◽  
Electron Microscopic ◽  
Adsorption Models ◽  
Electron Microscopic Image ◽  
Monotheca Buxifolia ◽  
Ph Range ◽  
Scanning Electron Microscopic Image

In this study, activated carbon derived from Monotheca buxifolia waste seeds was used for the adsorptive removal of a number of selected azo dyes such as Eriochrome Black T (EBT), Remazol brilliant blue (RBB), Remazol yellow (RY) and Remazol brilliant orange (RBO) from an aqueous solution by changing the initial dye concentration, adsorbent dosage, solution pH, contact time and temperature. A Fourier transform infrared spectroscopic analysis of the activated carbon showed the existence of hydroxyls, methyl, methylene, carbonyls, alkane and alkenes groups while the scanning electron microscopic image displayed the gradual formation of cavities and open pores on the surface. The results showed that as the amount of the adsorbent and the shaking time were increased, the removal percentage of the dye increased accordingly. Higher adsorption percentages were observed at a lower dye concentration and temperature in an acidic media at a pH range (1–5). The investigated data were evaluated with the Langmuir and Freundlich adsorption models. The maximum adsorption capacities obtained from the Langmuir model were 112.36, 96.34, 97.65 and 90.91 mg/g for EBT, RBB, RY and RBO, respectively. The results indicated that the electrostatic interaction was the main cause of the adsorption of these anionic azo dyes on the surface of the activated carbon.

Adsorptive Removal of Ni2+ from Aqueous Solution Using Rice Husk-Based Activated Carbon

2015 ◽  
Vol 754-755 ◽  
pp. 950-954
Author(s):  
Mohd Faisal Taha ◽  
Anis Suhaila Shuib ◽  
Maizatul Shima Shaharun ◽  
Azry Borhan
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Rice Husk ◽  
Textural Properties ◽  
Freundlich Isotherm ◽  
Isotherm Models ◽  
Adsorption Studies ◽  
Adsorptive Removal ◽  
Equilibrium Data ◽  
Good Potential

An attempt was made to study the potential of rice husk as an alternative cheap precursor for activated carbon to remove Ni2+ from aqueous solution. Rice husk was treated chemically (with NaOH) and physically (carbonization) to prepare rice husk based activated carbon (RHAC). The textural properties of RHAC, i.e. surface area (255 m2/g) and pore volume (0.17 cm2/g), were determined by N2 adsorption using Brunauer-Emmett-Teller (BET) surface analyzer. RHAC was also characterized for its morphology and its elemental compositions. The adsorption studies for the removal of Ni2+ from aqueous solution were carried out using different dosage of RHAC as adsorbent as a function of varied contact time. The concentration of Ni2+ was determined by atomic absorption spectrometer (AAS). The results obtained from adsorption studies indicate good potential of rice husk as a cheap precursor to produce activated carbon for the removal of Ni2+ from aqueous solution. The equilibrium data from adsorption studies fitted well the of Langmuir and Freundlich isotherm models.

scholarly journals Nitrogen-Doped Carbonaceous Materials for Removal of Phenol from Aqueous Solutions

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Magdalena Hofman ◽  
Robert Pietrzak
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Liquid Phase ◽  
Carbonaceous Material ◽  
Phase Changes ◽  
Waste Materials ◽  
Isotherm Models ◽  
Phenol Content ◽  
Nitrogen Doped ◽  
Adsorption Isotherm Models

Carbonaceous material (brown coal) modified by pyrolysis, activation, and enrichment in nitrogen, with two different factor reagents, have been used as adsorbent of phenol from liquid phase. Changes in the phenol content in the test solutions were monitored after subsequent intervals of adsorption with selected adsorbents prepared from organic materials. Significant effect of nitrogen present in the adsorbent material on its adsorption capacity was noted. Sorption capacity of these selected materials was found to depend on the time of use, their surface area, and pore distribution. A conformation to the most well-known adsorption isotherm models, Langmuir, and Freundlich ones, confirms the formation of mono- and heterolayer solute (phenol) coverage on the surface of the adsorbent applied herein. The materials proposed as adsorbents of the aqueous solution contaminants were proved effective, which means that the waste materials considered are promising activated carbon precursors for liquid phase adsorbents for the environmental protection.

scholarly journals Removal of amoxicillin from aqueous solution using sludge-based activated carbon modified by walnut shell and nano-titanium dioxide

2020 ◽  
Author(s):  
Xiaorong Kang ◽  
Yali Liu ◽  
Can Yang ◽  
Han Cheng
Keyword(s):  
Aqueous Solution ◽  
Titanium Dioxide ◽  
Activated Carbon ◽  
Adsorption Process ◽  
Removal Rate ◽  
Total Pore Volume ◽  
Raw Material ◽  
Walnut Shell ◽  
Order Kinetic ◽  
Nano Titanium Dioxide

Abstract Dewatered municipal sludge was used as raw material to prepare activated carbon (SAC), and the SAC was modified by walnut shell and nano-titanium dioxide (MSAC). The results showed that the MSAC had a higher specific surface area (SBET) (279.147 m2/g) and total pore volume (VT) (0.324 cm3/g) than the SAC. Simultaneously, the functional groups such as C-O, C = O, and Ti-O-Ti on the surface of MSAC were enhanced due to modification. These physicochemical properties provided prerequisites for the diffusion and degradation of pollutants in MSAC. Furthermore, the MSAC was applied to adsorb amoxicillin (AMX) from aqueous solution, in batch experiments, the maximum removal rate (88.19%) was observed at an initial AMX concentration of 30 mg/L, MSAC dosage of 5.0 g/L, pH of 8, contact time of 180 min, and temperature of 25 °C. In addition, the adsorption process was well described by the Freundlich isotherm model and pseudo-second-order kinetic model, indicating that the adsorption of AMX onto MSAC was dominated by multilayer chemisorption. Also, the adsorption thermodynamics suggested that the adsorption process of AMX onto MSAC was endothermic, feasible and spontaneous.

scholarly journals Reuse of Waste Materials as Precursors of Activated Carbon Synthesis for the Abatement of Antibiotic Cefpodoxime Proxetil from Industrial Effluents.

2020 ◽  
Author(s):  
Suryyia Manzoor ◽  
Naseem Abbas ◽  
Javier Fernandez ◽  
Amir Mirza ◽  
Ghazala Yasmin ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Activated Carbons ◽  
Raw Materials ◽  
Industrial Effluent ◽  
Freundlich Isotherm ◽  
Industrial Effluents ◽  
Walnut Shell ◽  
Isotherm Models ◽  
Maximum Removal

Abstract The release of antibiotics to aquatic environment creates aquatic ecotoxicity and their bioaccumulation results in antibiotic resistance. Hence to lessen the risk of ecotoxicity and depletion of natural resources, it is imperative to disclose alternate precursor raw materials that can be successfully employed for the synthesis of new sorbents capable to remove antibiotics from the environment. This research reports the synthesis of activated carbon based sorbents derived from waste biomaterials like coconut shell (CNAC), walnut shell & peach stone (WNAC) and Bombax ceiba fruit capsule (BCAC) and their ability to remove antibiotic Cefpodoxime from the industrial effluents. Activation of carbon was done by HNO3 and H3PO4. FTIR, BET and SEM techniques were used for characterization of sorbents. Langmuir and Freundlich isotherm models were applied to study the adsorption behavior. Moreover, the experimental adsorption capacity (qe) of the three activated carbons was found to be 32 mg/g for CNAC, 40 mg/g for WNAC and 10 mg/g for BCAC. The maximum removal efficiency of the drug was found to be 96% using the WNAC. HPLC analysis was performed to confirm the removal of Cefpodoxime from industrial effluent.

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