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.

Studies of Chromium Removal from Tannery Effluents by Dead Streptomyces Rimosus

2008 ◽  
Vol 3 (1) ◽  
Author(s):  
Mohamed Nasser Sahmoune ◽  
Krim Louhab ◽  
Aissa Boukhiar
Keyword(s):  
Fractional Power ◽  
Kinetic Studies ◽  
Second Order ◽  
Order Kinetic ◽  
Streptomyces Rimosus ◽  
Tannery Effluents ◽  
Equilibrium Data ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Ph Range

Dead streptomyces rimosus was found to be an effective biosorbent for the removal of chromium from industrial tanning effluents. A sorption level of 65 mg/g was observed at pH 4.8 while the precipitation effect augmented this value at a higher pH range. Chromium desorption increased with decreasing desorption agents pH (including HCl and H2SO4) to a maximum value of 95% at approximately zero pH. The biosorption data of trivalent chromium by streptomyces rimosus has been used for kinetic studies based on fractional power, Elovich, pseudo-first order and pseudo-second order rate expressions. The time-dependent Cr (III) biosorption data were well-described by a pseudo-second-order kinetic model. The intraparticle diffusion is not the rate-limiting step for the whole reaction. It was found that the biosorption equilibrium data fit well with the Langmuir model.

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.

Removal of Pb (II) from Aqueous Solution by Blast-Furnace Slags

2013 ◽  
Vol 726-731 ◽  
pp. 2736-2741
Author(s):  
Ming Da Liu ◽  
Ge Tian ◽  
Liang Jie Zhao ◽  
Yao Sheng Wang ◽  
Lei Guo ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Blast Furnace ◽  
Freundlich Isotherm ◽  
Kinetic Studies ◽  
Sorption Process ◽  
Second Order ◽  
Order Model ◽  
Pseudo Second Order ◽  
Solution Kinetic ◽  
Second Order Model

Five blast-furnace slags were used as adsorbents to remove Pb (II) from aqueous solution. Kinetic studies showed that the sorption process was best described by pseudo-second-order model. Among Langmuir, Freundlich and Temkin isotherms, the Freundlich isotherm had a better fit with the simulation of the adsorption of Pb (II).

scholarly journals Lead removal using Fallen Coffee Plant Leaves (FCPL) powder: Characterization, Equilibrium, Kinetics and Thermodynamic studies

2021 ◽  
Vol 309 ◽  
pp. 01077
Author(s):  
M Tukaram Bai ◽  
Ch. I. A. Raju ◽  
V Sridevi ◽  
Nalluri Chittibabu ◽  
P Venkateswarlu
Keyword(s):  
Correlation Coefficient ◽  
Kinetic Studies ◽  
Lead Removal ◽  
Order Kinetic ◽  
Plant Leaves ◽  
Coffee Plant ◽  
Freundlich Isotherms ◽  
Equilibrium Data ◽  
Order Kinetic Model ◽  
Pseudo Second Order

Biosorption of lead onto Fallen Coffee Plant leaves (FCPL) powder from an aqueous solution was studied in the present study. The characterization of FCPL powder was done by FTIR, XRD, SEM and BET. The equilibrium agitation time for lead biosorption is 60 min. The optimum pH and dosage values are 5.2 and 20 g/L respectively. In the range of variables studied, percentage biosorption is increased from 75.1 to 95.5 %. The maximum uptake capacity of 3.664 mg/g is obtained at 303 K. In the present investigation the equilibrium data was well explained by Langmuir, Redlich-Peterson with a correlation coefficient of 0.99, and followed by Temkin and Freundlich isotherms. The kinetic studies reveal that the biosorption system obeyed the pseudo second order kinetic model by considering the correlation coefficient value as 0.99. From the values of ∆S, ∆H and ∆G it is observed that the biosorption of lead onto Fallen coffee plant leaves(FCPL) powder was irreversible, endothermic and spontaneous.

scholarly journals Removal of phenol from aqueous solution using biochar produced from Araucaria Columnaris Bark

2021 ◽  
Author(s):  
Dinesh Chandola ◽  
Pooja Thathola ◽  
Ankit Bisht
Keyword(s):  
Aqueous Solution ◽  
Linear Regression ◽  
Contact Time ◽  
Regression Method ◽  
Second Order ◽  
Linear Regression Method ◽  
Batch Mode ◽  
Freundlich Isotherms ◽  
Nature Study ◽  
Pseudo Second Order

Abstract Abstract This work investigates the removal of phenol from aqueous solution using Araucaria Columnaris bark (ACB) as biochar. Five different types of biochars were developed through pyrolysis at different temp from 300 to 500°C. The effects of initial concentration, contact time, pH and temperature on adsorption behavior were studied in batch mode for each biochar. The optimum contact time observed for equilibrium condition was 60 mins for every biochar. And, the maximum adsorption followed the order 298 K > 308 K > 318 K. Adsorption equilibrium data were fitted to Langmuir and Freundlich isotherms by non-linear regression method and kinetic data by linear regression method, and fitted to pseudo-first order, pseudo-second order and Intraparticle diffusion models. Adsorption kinetics was reasonably described by pseudo-second order model with R 2 value 0.99. Thermodynamic parameters were also estimated that implied, the adsorption process was spontaneous and exothermic in nature. Study further showed that the acidic pH increased adsorption capacity of biochar but decreases continuously towards basic side. The removal of phenol with prepared biochar was achieved as high as 100 % for ACB-500. The maximum iodine adsorption value of prepared biochar was found to be 453.3 mg/g.

scholarly journals Fabrication of magnetic lignin-based adsorbent for removal of methyl orange dye from aqueous solution

BioResources ◽  
2021 ◽  
Vol 16 (3) ◽  
pp. 5436-5449
Author(s):  
Chao Cao ◽  
Lupeng Shao ◽  
Lucian A. Lucia ◽  
Yu Liu
Keyword(s):  
Aqueous Solution ◽  
Methyl Orange ◽  
Influence Factors ◽  
Maximum Adsorption Capacity ◽  
X Ray Diffraction ◽  
Adsorption Mechanisms ◽  
Equilibrium Data ◽  
Pseudo Second Order ◽  
Methyl Orange Dye ◽  
Adsorption Desorption

Magnetic lignin-based adsorbent (MLA) was successfully fabricated to remove methyl orange dye from aqueous solution. The synthesized MLA was characterized by means of Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), N2 adsorption-desorption, scanning electron microscopy (SEM), and vibrating sample magnetometer (VSM). In the process of adsorption, influence factors and recycling performance were considered, and the adsorption mechanisms such as isotherm and kinetics were investigated. The result showed that the equilibrium data was consisted with the Langmuir model with a maximum adsorption capacity of 85.0 mg/g. The adsorption kinetics followed a pseudo-second-order model. Based the adsorption performance, MLA showed good recyclability. Therefore, these results demonstrate that MLA could offer a great potential as an efficient and reusable adsorbent in the wastewater treatments.

scholarly journals Adsorptive Removal of Anionic Azo Dye Acid Black 194 from Aqueous Solution using NNMBA-Crosslinked Poly N-Vinyl Pyrrolidone Hydrogel

2019 ◽  
Vol 32 (2) ◽  
pp. 311-316
Author(s):  
Rino Laly Jose ◽  
M.G. Gigimol ◽  
Beena Mathew
Keyword(s):  
Aqueous Solution ◽  
Azo Dye ◽  
Freundlich Isotherm ◽  
Kinetic Studies ◽  
Vinyl Pyrrolidone ◽  
Batch Adsorption ◽  
Freundlich Isotherms ◽  
Physico Chemical ◽  
Before And After ◽  
Pseudo Second Order

N,N-Methylene bis-acrylamide crosslinked poly-N-vinyl pyrrolidone hydrogels were synthesized and binding of the hydrogel with the dye solution was followed spectrophotometrically. The chemical structure and morphology of the hydrogel before and after adsorption of acid black 194 was confirmed by FT-IR and SEM. Effect of various physico-chemical parameters such as concentration, temperature, pH, time and the amount of hydrogel used were investigated by batch adsorption studies. Hydrogel used as adsorbent in this study was characterized by UV-Vis spectrophotometer before and after adsorption of acid black 194. Kinetic studies suggested pseudo second order reaction. Langmuir and Freundlich isotherms were applied on equilibrium adsorption data and found that Freundlich isotherm fit better for the present investigation. N,N-methylene bisacrylamide crosslinked poly-N-vinyl pyrrolidone hydrogel displayed excellent properties for the removal of the azo dye, acid black 194 from aqueous solution.

Kinetic Studies of Adsorption of Disperse Blue 2BLN from Aqueous Solution by Expanded Graphite

2011 ◽  
Vol 148-149 ◽  
pp. 357-360
Author(s):  
Jin Bo Huang ◽  
Min Cong Zhu ◽  
Zhi Fang Zhou ◽  
Hong Xia Zhang
Keyword(s):  
Aqueous Solution ◽  
Room Temperature ◽  
Ph Value ◽  
Expanded Graphite ◽  
Kinetic Studies ◽  
Second Order ◽  
Batch Adsorption ◽  
Initial Ph ◽  
Intra Particle Diffusion ◽  
Pseudo Second Order

Expanded graphite (EG) was prepared by microwave irradiation and evaluated as adsorbent for the removal of disperse blue 2BLN (DB) from aqueous solution by the batch adsorption technique under different conditions of initial pH value, adsorbent dosage, initial dye concentration and contact time. The experimental data were analyzed considering pseudo-first-order, pseudo-second-order and intra-particle diffusion approaches. The adsorption kinetics at room temperature could be expressed by the pseudo second order model very well. The results indicate that the adsorption rate is fast enough and more than eighty percent of the adsorbed DB can be removed in the first 15 min at room temperature, which makes the process practical for industrial application.

scholarly journals Adsorption removal of methylene blue from aqueous solution on carbon-coated Fe3O4 microspheres functionalized with chloroacetic acid

2018 ◽  
Vol 25 (2) ◽  
pp. 353-361
Author(s):  
Zefei Zhang ◽  
Cholhwan Kim ◽  
Carlos Fernandez ◽  
Manickam Minakshi Sundaram ◽  
Thippeswamy Ramakrishnappa ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Chloroacetic Acid ◽  
Second Order ◽  
Magnetic Microspheres ◽  
Order Kinetic ◽  
Adsorption Model ◽  
Equilibrium Data ◽  
Carbon Coated ◽  
Pseudo Second Order

AbstractWe report the preparation and employability of carbon-coated Fe3O4(Fe3O4/C) microspheres functionalized with chloroacetic acid (CAA) for the removal of methylene blue (MB) in aqueous solution. The prepared magnetic microspheres (Fe3O4/C-CAA) were characterized by the following techniques: X-ray diffraction, transmission electron microscopy, Fourier-transform infrared spectrometer, vibrating sample magnetometry, and Brunauer-Emmett-Teller. The characterization results showed that Fe3O4/C microspheres were modified by CAA without any phase change. Fe3O4/C-CAA microspheres have higher adsorption capacity for MB compared to Fe3O4/C microspheres. The Langmuir, Freundlich, and Temkin adsorption models were applied to describe the equilibrium isotherms, and the Langmuir adsorption model fitted well with the equilibrium data. The pseudo-first-order and pseudo-second-order kinetic models were used to describe the kinetics data. However, the pseudo-second-order kinetic model fitted better with the adsorption kinetics data.

Use of papaya seeds as a biosorbent of methylene blue from aqueous solution

2013 ◽  
Vol 68 (2) ◽  
pp. 441-447 ◽  
Author(s):  
Diego S. Paz ◽  
Alexandre Baiotto ◽  
Marcio Schwaab ◽  
Marcio A. Mazutti ◽  
Mariana M. Bassaco ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Methylene Blue ◽  
Second Order ◽  
Adsorption Kinetic ◽  
Maximum Adsorption Capacity ◽  
Order Model ◽  
Equilibrium Data ◽  
Pseudo Second Order ◽  
Papaya Seeds ◽  
Second Order Model

In this study papaya seeds were used to remove methylene blue dye from aqueous solution. Papaya seeds were characterized as possessing a macro/mesoporous texture and large pore size. Studies were carried out in batches to evaluate the effect of contact time and pH (2–12) on the removal of dye. It was observed that the adsorption of dye was better in the basic region (pH 12). The equilibrium data were analyzed using Langmuir, Freundlich, Dubinin–Raduschkevich, Tempkin, Jovanovich, Redlich–Peterson, Sips, Toth and Radke–Prausnitz isotherms. The equilibrium data were best described by the Langmuir isotherm with a maximum adsorption capacity of 637.29 mg g–1. Adsorption kinetic data were fitted using the pseudo-first-order and pseudo-second-order model. The adsorption kinetic is very fast and was best described by the pseudo-second-order model.

Sign in / Sign up

Export Citation Format

Share Document