scholarly journals Adsorption of Reactive Black 5 on Synthesized Titanium Dioxide Nanoparticles: Equilibrium Isotherm and Kinetic Studies

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Majeed A. Shaheed ◽  
Falah H. Hussein
Keyword(s):  
Titanium Dioxide ◽  
Aqueous Solutions ◽  
Titanium Dioxide Nanoparticles ◽  
Kinetic Studies ◽  
Second Order ◽  
Reactive Black 5 ◽  
Adequate Model ◽  
Factors Affecting ◽  
Freundlich Isotherms ◽  
Pseudo Second Order

The synthesized titanium dioxide nanoparticles (TiO2-NPs) were used as adsorbent to remove reactive black 5 (RB 5) in aqueous solution. Various factors affecting adsorption of RB 5 aqueous solutions such as pH, initial concentration, contact time, dose of nanoparticles, and temperature were analyzed at fixed solid/solution ratio. Langmuir and Freundlich isotherms were used as model adsorption equilibrium data. Langmuir isotherm was found to be the most adequate model. The pseudo-first-order, pseudo-second-order, and intraparticle diffusion models were used to describe the adsorption kinetics. The experimental data was fitted to pseudo-second-order kinetics. The thermodynamic parameters such as Gibbs-free energy, enthalpy, and entropy changes were determined. These parameters indicated the endothermic and spontaneity nature of the adsorption. The results demonstrated the fact that the TiO2-NPs are promising adsorbent for the removal of RB 5 from aqueous solutions.

scholarly journals Comparison of novel Ziziphus lotus adsorbent and industrial carbon on methylene blue removal from aqueous solutions

2018 ◽  
Vol 78 (10) ◽  
pp. 2055-2063
Author(s):  
Asmaa Msaad ◽  
Mounir Belbahloul ◽  
Samir El Hajjaji ◽  
Abdeljalil Zouhri
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Aqueous Solutions ◽  
Low Cost ◽  
Sorption Process ◽  
Second Order ◽  
Order Kinetic ◽  
Industrial Carbon ◽  
Freundlich Isotherms ◽  
Pseudo Second Order

Abstract In this work, the use of a novel low-cost adsorbent derived from Ziziphus lotus (ZL) and industrial carbon (IC) has been successfully applied to the removal of methylene blue (MB) from aqueous solutions. The efficiency of this material was studied through Lagergren pseudo-first-order and pseudo-second-order kinetic models. The process for the novel activated carbon and the IC were best represented by the pseudo-second-order rate model. Langmuir and Freundlich isotherms were used to describe the sorption equilibrium data. The Langmuir model turned out to be the most adequate and maximum capacities were measured to be 833.33 and 142.85 mg.g−1 for ZL activated carbon and IC from Sigma Aldrich, respectively. The thermodynamic study revealed that the sorption process is spontaneous and endothermic for the two adsorbents. To explain the effectiveness of MB removal, ZL activated carbon was characterized by scanning electron microscopy, Brunauer–Emmett–Teller surface area, X-ray diffraction and Fourier transform infrared spectroscopy.

Adsorption of methyl violet from aqueous solution using brown algae Padina sanctae-crucis

2018 ◽  
Vol 43 (6) ◽  
pp. 623-631 ◽  
Author(s):  
Reza Mahini ◽  
Hossein Esmaeili ◽  
Rauf Foroutan
Keyword(s):  
Aqueous Solutions ◽  
Brown Algae ◽  
Contact Time ◽  
Methyl Violet ◽  
Kinetic Studies ◽  
Maximum Adsorption Capacity ◽  
Order Model ◽  
Equilibrium Study ◽  
Freundlich Isotherms ◽  
Pseudo Second Order

Abstract Objective The presence of dyes in the water is toxic and harmful to human body so, it must be removed from the water. In the present study, the removal of methyl violet (MV) from aqueous solutions using brown algae “Padina sanctae-crucis” was investigated. Materials and methods The rate of adsorption was investigated under various parameters such as contact time (5–200), pH (2–11), dye concentration (10–60 mg/L), amount of adsorbent (0.25–5 g/L) and temperature (25–45°C). Results The maximum adsorption was achieved in 10 mg/L, pH=8 and adsorbent dose 2 g/L and 80 min contact time for removal of MV from aqueous solutions. Kinetic studies showed that the pseudo second-order model describes adsorbent kinetic behavior better. Besides, experimental data have been modeled using Langmuir and Freundlich isotherms and the results showed that both models are proper to describe adsorption isotherm behavior. In addition, the equilibrium study shows that the adsorption was physical and favorable. Moreover, a thermodynamic study revealed that the adsorption process is exothermic and spontaneously in nature. Furthermore, Maximum adsorption capacity using adsorbent was 10.02 mg/g. Conclusions It could be concluded that the P. sanctae-crucis biomass is a good adsorbent for removing MV dyes from aqueous solutions.

Synthesis and characterization of a novel magnetic biochar from sewage sludge and its effectiveness in the removal of methyl orange from aqueous solution

2017 ◽  
Vol 75 (7) ◽  
pp. 1539-1547 ◽  
Author(s):  
Jing Zhang ◽  
Mao Liu ◽  
Tao Yang ◽  
Kai Yang ◽  
Hongyu Wang
Keyword(s):  
Aqueous Solution ◽  
Methyl Orange ◽  
Sewage Sludge ◽  
Kinetic Studies ◽  
Second Order ◽  
Environmental Cleanup ◽  
Magnetic Biochar ◽  
Freundlich Isotherms ◽  
Equilibrium Data ◽  
Pseudo Second Order

A novel magnetic biochar from sewage sludge (MSBC) using SrFe12O19 as magnetic substrate was successfully synthesized under high-temperature and oxygen-free conditions. Several techniques and methodologies (X-ray diffraction, Fourier transform infrared spectroscopy and vibrating sample magnetometer) were used to determine the surface functional groups and physicochemical properties of MSBC, which showed that the MSBC combined the features of both SrFe12O19 and sludge biochar (SBC). And then the adsorption behavior of methyl orange (MO) from aqueous solution onto the MSBC was investigated. And the influence of variables including pH, initial concentration of MO, adsorbent dosage and contact time was studied in detail. The optimal adsorption amount of MO (149.18 mg·g−1) was obtained with 600 MO mg·L−1, 2 MSBC g·L−1, at pH of 5 for 40 min. The equilibrium data were evaluated using Langmuir and Freundlich isotherms. The Langmuir model better described the absorption of MO. Besides, the kinetic data were analyzed using pseudo-first-order and pseudo-second-order equations, and the pseudo-second order exhibited the better fit for the kinetic studies (R2 = 0.9982). This study showed that MSBC could be utilized as an efficient, magnetically separable adsorbent for the environmental cleanup.

scholarly journals SYNTHESIS OF STARCH MODIFIED MONTMORILLONITE AS AN EFFECTIVE ADSORBENT FOR Pb (II) REMOVAL FROM WATER

2019 ◽  
Vol 57 (3A) ◽  
pp. 94
Author(s):  
Tam Hoang Luu ◽  
Hung Van Nguyen ◽  
Nhan Thuc Chi Ha ◽  
Khoa Nguyen Dang Vo
Keyword(s):  
Experimental Data ◽  
Kinetic Studies ◽  
Batch Process ◽  
Second Order ◽  
X Ray Diffraction ◽  
Equilibrium Studies ◽  
Factors Affecting ◽  
Order Rate ◽  
Monolayer Adsorption ◽  
Pseudo Second Order

The adsorbent is prepared by the montmorillonite co-modification with starch for the removal of Pb (II) ions from aqueous solution. The Fourier-transformed infrared (FTIR), X-ray diffraction (XRD) spectroscopies were used to determine the structure and characteristics of the adsorbent. The main factors affecting the removal of Pb (II) ions were investigated, including the effect of pH, contact time, adsorbent dosage and the initial concentration of Pb (II). Batch process can be used for adsorption and equilibrium studies. The experimental data were fitted using Freundlich and Langmuir adsorption models. The Langmuir isotherm best fitted the experimental data with R2> 0.99 and maximum Pb (II) adsorption capacity of 21.5 mg/g indicated monolayer adsorption. Kinetic studies using pseudo-first-order and pseudo-second-order rate models showed that the process complied well with the pseudo second-order rate model.

scholarly journals Macroalgae of Iridaea cordata as an efficient biosorbent to remove hazardous cationic dyes from aqueous solutions

2017 ◽  
Vol 76 (12) ◽  
pp. 3379-3391 ◽  
Author(s):  
Leticia Belén Escudero ◽  
Patricia Nora Smichowski ◽  
Guilherme Luiz Dotto
Keyword(s):  
Aqueous Solutions ◽  
Kinetic Studies ◽  
Second Order ◽  
Marine Macroalgae ◽  
Equilibrium Studies ◽  
Biosorption Process ◽  
Effects Of Ph ◽  
Pseudo Second Order ◽  
Good Concordance ◽  
Iridaea Cordata

Abstract In the present work, Iridaea cordata (IC), a red marine macroalgae, was used as an efficient biosorbent for the removal of crystal violet (CV) and methylene blue (MB) dyes from aqueous solutions. The effects of pH (5, 7, and 9) and IC concentration (1, 3, and 5 g L−1) on the biosorption were studied through a 32 full factorial design. Under the optimal conditions (pH: 7, biosorbent concentration: 1 g L−1), biosorption kinetic studies were developed and the obtained experimental data were evaluated by pseudo-first order and pseudo-second order models. The results showed that the pseudo-second order model was in agreement with the experimental kinetic data for both dyes. Equilibrium studies were also carried out, and results exhibited good concordance with the Brunauer–Emmett–Teller isotherm. The biosorption capacities were 36.5 and 45.0 mg g−1 for CV and MB dyes, respectively. The dye removal percentages were around 75% for CV and 90% for MB. Thermodynamically, the biosorption process proved to be exothermic, spontaneous, and favorable. These results showed that IC biomass is a promising biosorbent for removal of CV and MB dyes from aqueous solutions.

scholarly journals Removal of Fluorescein Dye from Aqueous Solutions Using Natural and Chemically Treated Pine Sawdust

2020 ◽  
Vol 2020 ◽  
pp. 1-9
Author(s):  
Nada S. Al-Kadhi
Keyword(s):  
Aqueous Solutions ◽  
Dye Removal ◽  
Physical Adsorption ◽  
Kinetic Studies ◽  
Optimal Conditions ◽  
Factors Affecting ◽  
Pine Sawdust ◽  
Pseudo Second Order ◽  
Fluorescein Dye ◽  
Parameter Values

The various factors affecting the removal of fluorescein dye using sawdust from aqueous solutions such as time, initial concentration, pH, and temperature were studied. The optimal conditions for removing the FD are 1 g of sawdust at pH 3 and 120 min time of contact. Dye removal dropped from 93.42% to 80.04% with natural pine sawdust (NPS) and from 96.83% to 81.51% with synthetic pine sawdust (SPS) by increasing their concentration from 2 to 10 mg/L. Isotherm, kinetic, and thermodynamic models were applied for determining their constants. The results indicated that the FD removal equilibrium was effectively defined by the Langmuir, Freundlich, and Temkin models. Kinetic studies showed that the pseudo-second order was well suited for dye removal, and the internal diffusion process was by two steps. The thermodynamic parameter values suggested that FD removal were physical adsorption, exothermic, lower randomness, and spontaneous.

scholarly journals Removal of Methylene Blue from Aqueous Solution by Activated Carbon Prepared from Pea Shells (Pisum sativum)

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Ünal Geçgel ◽  
Gülce Özcan ◽  
Gizem Çağla Gürpınar
Keyword(s):  
Methylene Blue ◽  
Activated Carbon ◽  
Aqueous Solutions ◽  
Kinetic Studies ◽  
Second Order ◽  
Order Kinetic ◽  
Adsorption Processes ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Langmuir And Freundlich Models

An activated carbon was prepared from pea shells and used for the removal of methylene blue (MB) from aqueous solutions. The influence of various factors such as adsorbent concentration, initial dye concentration, temperature, contact time, pH, and surfactant was studied. The experimental data were analyzed by the Langmuir and Freundlich models of adsorption. The adsorption isotherm was found to follow the Langmuir model. The monolayer sorption capacity of activated carbon prepared from pea shell for MB was found to be 246.91 mg g−1at 25∘C. Two simplified kinetic models including pseudo-first-order and pseudo-second-order equation were selected to follow the adsorption processes. Kinetic studies showed that the adsorption followed pseudo-second-order kinetic model. Various thermodynamic parameters such as , , and were evaluated. The results in this study indicated that activated carbon prepared from pea shell could be employed as an adsorbent for the removal of MB from aqueous solutions.

scholarly journals ADSORPTION OF REACTIVE BLACK 5 FROM AQUEOUS SOLUTION BY ZEOLITE FROM COAL FLY ASH: EQUILIBRIUM AND KINETIC STUDIES

2011 ◽  
Vol 08 (16) ◽  
pp. 17-24
Author(s):  
Patricia CUNICO ◽  
Denise Alves FUNGARO ◽  
Carina Pitwak MAGDALENA
Keyword(s):  
Fly Ash ◽  
Aqueous Solutions ◽  
Coal Fly Ash ◽  
Kinetic Studies ◽  
Reactive Black 5 ◽  
Order Kinetic ◽  
Zeolitic Material ◽  
Isotherm Adsorption ◽  
Coal Fly Ashes ◽  
Pseudo Second Order

Zeolite synthesized from coal fly ash (ZC) and coal fly ashes (CC) were used as adsorbents to remove Reactive Black 5 (RP5) dye from aqueous solutions. The equilibrium time was reached after 420 min. The kinetics studies indicated that the adsorption followed the pseudo-second order kinetic and that surface adsorption and intraparticle diffusion were involved in the adsorption mechanism. The isotherm adsorption data fit accordingly to the Langmuir model for both adsorbents. The maximum adsorption capacities were 0.685 mg g-1 for RP5/ZC system and 0.577 mg g-1 for RP5/CC system. The efficiencies of adsorption were found to be between 47.7-88.1% for ZC and 65.4-99.6% for CC. The results indicate that zeolitic material is suitable as adsorbent for adsorption of reactive azodye from aqueous solutions.

scholarly journals Use of fly ash and fly ash agglomerates for As(III) adsorption from aqueous solution

2014 ◽  
Vol 16 (1) ◽  
pp. 21-27 ◽  
Author(s):  
Justyna Ulatowska ◽  
Izabela Polowczyk ◽  
Wojciech Sawiński ◽  
Anna Bastrzyk ◽  
Tomasz Koźlecki ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Fly Ash ◽  
Aqueous Solutions ◽  
Thermodynamic Parameters ◽  
Kinetic Studies ◽  
Second Order ◽  
Isotherm Models ◽  
Pseudo Second Order ◽  
Chemisorption Model

Abstract The objective of the present study is to assess the efficiency of fly ash and fly ash agglomerates to remove arsenic(III) from aqueous solution. The maximum static uptakes were achieved to be 13.5 and 5.7 mgAs(III)/adsorbent for nonagglomerated material and agglomerated one, respectively. Isotherm studies showed good fit with the Langmuir (fly ash) and the Freundlich (fly ash agglomerates) isotherm models. Kinetic studies indicated that the sorption of arsenic on fly ash and its agglomerates follows the pseudo-second-order (PSO) chemisorption model (R2 = 0.999). Thermodynamic parameters revealed an endothermic nature of As(III) adsorption on such adsorbents. The adsorption results confirmed that fly ash and its agglomerates can be used for As(III) removal from aqueous solutions. Fly ash can adsorb more arsenic(III) than agglomerates, which are easier to use, because this material is less dusty and easier to separate from solution.

scholarly journals REMOVAL OF As (V) BY USING BOTTOM ASH AS ADSORBENT

2017 ◽  
Vol 5 ◽  
pp. 1259-1265
Author(s):  
Meral Yildirim ◽  
Nevin Karamahmut Mermer ◽  
Funda Demir ◽  
Emek Moroydor Derun
Keyword(s):  
Industrial Development ◽  
Bottom Ash ◽  
Freundlich Isotherm ◽  
Kinetic Studies ◽  
Order Rate Constant ◽  
Second Order ◽  
Experimental Results ◽  
Order Kinetic ◽  
Freundlich Isotherms ◽  
Pseudo Second Order

Industrial development brings waste problem which is a challenge for both human health and ecological cycle. Arsenic is a toxic and carcinogenic heavy metal that should be removed from drinking or waste water. In this study, an industrial waste of bottom ash was used as an adsorbent to remove As (V). To find an appropriate adsorption conditions, the adsorption temperatures and contact time were varied between 30 °C-50 °C and 5-180 min, respectively. The experimental results were fitted to the Langmuir and Freundlich isotherms. The highest values of n and KF for Freundlich isotherm were obtained for 30 °C and calculated as 0.432 and 0.006, respectively. According to kinetic studies, the kinetics of these experiments could be explained by pseudo-second order kinetic model, and the pseudo-second order rate constant was calculated as 0.034 g/mg.min, 0.033 g/mg.min and 0.030 g/mg.min for 30 °C, 40 °C and 50 °C, respectively. According to experimental results, bottom ash can be used for removal of As (V) from water sources.

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