scholarly journals Isotherm study of banana stem waste adsorbents to reduce the concentration of textile dying waste

2021 ◽  
Author(s):  
Asep Bayu Dani Nandiyanto ◽  
◽  
Nissa Nur Azizah ◽  
Salma Rahmadianti ◽  
◽  
...  
Keyword(s):  
Methyl Orange ◽  
Single Layer ◽  
Maximum Adsorption Capacity ◽  
Adsorption Models ◽  
Isotherm Study ◽  
Washing Process ◽  
Isotherm Adsorption ◽  
Temperature And Pressure ◽  
Negative Impacts ◽  
Banana Stem

The purpose of this study was to make carbon from banana stem waste and determine the isotherm adsorption characteristics of carbon from banana stem waste to methyl orange compounds. The process for making carbon from banana stem waste was done through the stages of preparation and carbonization at a temperature of 250°C for 1.5 h. Before being used as carbon, banana stem waste was cleaned, washed, dried, and mashed using a mill. The carbon then went through a washing process to remove impurities and tested for its absorbance ability into a solution containing a methyl orange compound under constant conditions of pH, temperature, and pressure. The experimental results showed that the appropriate sequence of adsorption models is the Langmuir, Temkin, Freundlich, and Dubinin-Radushkevich models. Adsorption occurs on the surface of a single layer (monolayer) and the interaction between the adsorbent and the adsorbate occurs physically. The value of maximum adsorption capacity (Qmax) is 37.5940 mg/g. The presence of banana stem carbon is expected to reduce the negative impacts, one of which is the disposal of industrial wastewater from textile factories.

scholarly journals Adsorción del naranja de metilo en solución acuosa sobre hidróxidos dobles laminares

2015 ◽  
Vol 25 (3) ◽  
pp. 25-34 ◽  
Author(s):  
Laura Alicia Ramírez Llamas ◽  
Araceli Jacobo Azuara ◽  
J. Merced Martínez Rosales
Keyword(s):  
Methyl Orange ◽  
Adsorption Capacity ◽  
Dye Adsorption ◽  
Temperature Programmed Desorption ◽  
Maximum Adsorption Capacity ◽  
X Ray Diffraction ◽  
X Ray ◽  
Suitable Temperature ◽  
Temperature Programmed ◽  
Double Hydroxides

In this paper, layered double hydroxides (LDH) were synthesized and characterized using techniques of Physisorption of Nitrogen, Infrared, Temperature Programmed Desorption, X-Ray Diffraction, TGA and Immersion Microcalorimetry, in order to determine the basic properties of the adsorbent. The methyl orange (MO) is used as a dye and as a result, it is frequently found in effluents from textile industries. The dye adsorption isotherms on LDH were studied as function of pH and temperature. The maximum adsorption capacity of methyl orange on LDH was carried out at pH 5, and the minimum adsorption capacity at pH 11, being 40.2 mg/g and 22.1 mg/g, respectively. Furthermore, the suitable temperature to promote the adsorption of methyl orange on LDH was at 25 °C, as at 35 °C shows a significant decrease. 

scholarly journals Efficient and Selective Adsorption of Gold Ions from Wastewater with Polyaniline Modified by Trimethyl Phosphate: Adsorption Mechanism and Application

Polymers ◽  
2019 ◽  
Vol 11 (4) ◽  
pp. 652 ◽  
Author(s):  
Wang ◽  
Zhao ◽  
Wang ◽  
Zhang ◽  
Zhang
Keyword(s):  
Adsorption Capacity ◽  
Adsorption Process ◽  
Selective Adsorption ◽  
Interaction Mechanism ◽  
Single Layer ◽  
Phosphate Adsorption ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Trimethyl Phosphate ◽  
Selective Recovery

The selective recovery of gold from wastewater is necessary because it is widely used in various fields. In this study, a new polymeric adsorbent (TP-AFC) was prepared by modifying polyaniline with trimethyl phosphate for the selective recovery of gold from wastewater. Bath experiments were carried out to explore the adsorption capacity and mechanism. The optimum pH of adsorption is 4. The adsorption equilibrium is reached at 840 min. The maximum adsorption capacity is 881 mg/g and the adsorption was a spontaneous endothermic process. The adsorption process fitted well with pseudo second-order kinetic and the Langmuir-models. The single-layer chemisorption governed the adsorption process. In addition, the application in wastewater indicated that the interfering ions had no effect on the adsorption of gold ions. TP-AFC has good selectivity. The interaction mechanism was mainly ion exchange and complexation. In general, TP-AFC was successfully prepared and has an excellent future in practical application.

Fe3O4-CS-L: a magnetic core-shell nano adsorbent for highly efficient methyl orange adsorption

2017 ◽  
Vol 77 (3) ◽  
pp. 628-637 ◽  
Author(s):  
Shuangzhen Guo ◽  
Jian Zhang ◽  
Xianlong Li ◽  
Fan Zhang ◽  
Xixi Zhu
Keyword(s):  
Methyl Orange ◽  
Adsorption Capacity ◽  
Thermo Gravimetric Analysis ◽  
Kinetic Studies ◽  
Magnetic Core ◽  
Infrared Spectrometry ◽  
Core Shell ◽  
Maximum Adsorption Capacity ◽  
Gravimetric Analysis ◽  
Equilibrium Studies

Abstract A novel core-shell bio-adsorbent was fabricated by using biological materials for removing methyl orange (MO) from aqueous solution. The structure characteristics results of scanning electron microscopy (SEM), Fourier transform infrared spectrometry (FT-IR), thermo-gravimetric analysis (TGA), vibrating sample magnetometer (VSM), and Brunauer–Emmett–Teller (BET) shows that Fe3O4-CS-L has been successfully prepared. The effects of contact time, pH, temperature and initial concentration were explored. The results suggested pH was a negligible factor in adsorption progress. Kinetic studies showed that the experiment data followed pseudo-second-order model. Boyd mode suggested that external mass transfer showed a rather weak rate control for MO adsorption onto Fe3O4-CS-L. Equilibrium studies showed that isotherm data were the best described by Langmuir model. The maximum adsorption capacity of MO estimated to be 338.98 mg/g at 298 K. Moreover, the adsorption capacity of Fe3O4-CS-L can keep about 74% in the fifth adsorption–regeneration cycle. Thus, the Fe3O4-CS-L could be a kind of promising material for removing MO from wastewater.

Utilization of cross-linked chitosan/bentonite composite in the removal of methyl orange from aqueous solution

2014 ◽  
Vol 71 (2) ◽  
pp. 174-182 ◽  
Author(s):  
Ruihua Huang ◽  
Qian Liu ◽  
Lujie Zhang ◽  
Bingchao Yang
Keyword(s):  
Methyl Orange ◽  
Aqueous Solutions ◽  
Ph Value ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Wide Ph Range ◽  
Order Kinetic Model ◽  
Langmuir Isotherm Model ◽  
Ph Range ◽  
A Minor

A kind of biocomposite was prepared by the intercalation of chitosan in bentonite and the cross-linking reaction of chitosan with glutaraldehyde, which was referred to as cross-linked chitosan/bentonite (CCS/BT) composite. Adsorptive removal of methyl orange (MO) from aqueous solutions was investigated by batch method. The adsorption of MO onto CCS/BT composite was affected by the ratio of chitosan to BT and contact time. pH value had only a minor impact on MO adsorption in a wide pH range. Adsorption kinetics was mainly controlled by the pseudo-second-order kinetic model. The adsorption of MO onto CCS/BT composite followed the Langmuir isotherm model, and the maximum adsorption capacity of CCS/BT composite calculated by the Langmuir model was 224.8 mg/g. Experimental results indicated that this adsorbent had a potential for the removal of MO from aqueous solutions.

Synthesis of NH2-Functionalized Nano-Fe3O4 Magnetic Polymer Adsorbent and its Application for the Removal of Cr (VI) from Industrial Wastewater

2009 ◽  
Vol 79-82 ◽  
pp. 1883-1886 ◽  
Author(s):  
Yong Gang Zhao ◽  
Hao Yu Shen ◽  
Mei Qin Hu ◽  
Feng Wei ◽  
Yun Jie Luo ◽  
...  
Keyword(s):  
Langmuir Isotherm ◽  
Industrial Wastewater ◽  
Ph Value ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Adsorption Efficiency ◽  
Mechanism Study ◽  
Study Results ◽  
Isotherm Adsorption ◽  
Effects Of Ph

In this study, a novel NH2-functionalized nano-sized magnetic polymer (TEPA-NMP) adsorbent coupling with tetraethylenepentamine (TEPA) had been prepared. Its application for the removal of Cr(VI) from industrial wastewater was investigated. Batch adsorption studies were carried out to evaluate the effects of pH value, initial concentration, adsorption isotherm, adsorption kinetics, and desorption characters etc. The adsorption of Cr(VI) reached equilibrium rapidly within 30 mins. The adsorption efficiency of the TEPA-NMP on Cr(VI) was dependent on pH value and the initial Cr(VI) concentration. The adsorption efficiency of Cr(VI) decreased with the increasing of the initial Cr(VI) concentration and pH value. The adsorption data were well fitted with the Langmuir isotherm. The maximum adsorption capacity calculated from the Langmuir isotherm was 370.4 mg/g at temperature of 35 °C and pH of 2.0. Regeneration studies indicated that the adsorbent could be reused for 8 times with only 3.4 % lost of adsorption efficiency. The adsorption mechanism study results suggested that the adsorption of Cr(VI) could be related with electrostatic attraction, ion exchange and coordination interactions.

scholarly journals Mechanosynthesis of MFe2O4 (M = Co, Ni, and Zn) Magnetic Nanoparticles for Pb Removal from Aqueous Solution

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
America R. Vazquez-Olmos ◽  
Mohamed Abatal ◽  
Roberto Y. Sato-Berru ◽  
G. K. Pedraza-Basulto ◽  
Valentin Garcia-Vazquez ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Xrd Analysis ◽  
Maximum Adsorption Capacity ◽  
Sorption Behavior ◽  
Order Kinetic ◽  
X Ray ◽  
Isotherm Adsorption ◽  
Crystallite Sizes ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order

Adsorption of Pb(II) from aqueous solution using MFe2O4 nanoferrites (M = Co, Ni, and Zn) was studied. Nanoferrite samples were prepared via the mechanochemical method and were characterized by X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), micro-Raman, and vibrating sample magnetometry (VSM). XRD analysis confirms the formation of pure single phases of cubic ferrites with average crystallite sizes of 23.8, 19.4, and 19.2 nm for CoFe2O4, NiFe2O4, and ZnFe2O4, respectively. Only NiFe2O4 and ZnFe2O4 samples show superparamagnetic behavior at room temperature, whereas CoFe2O4 is ferromagnetic. Kinetics and isotherm adsorption studies for adsorption of Pb(II) were carried out. A pseudo-second-order kinetic describes the sorption behavior. The experimental data of the isotherms were well fitted to the Langmuir isotherm model. The maximum adsorption capacity of Pb(II) on the nanoferrites was found to be 20.58, 17.76, and 9.34 mg·g−1 for M = Co, Ni, and Zn, respectively.

scholarly journals Removal of Metronidazole residues from aqueous solutions based on magnetic multiwalled carbon nanotubes by response surface methodology and isotherm study

2020 ◽  
Vol 3 (03) ◽  
pp. 44-53
Author(s):  
Mohammad Reza Rezaei Kahkha ◽  
Gholamreza Ebrahimzadeh ◽  
Ahmad Salarifar
Keyword(s):  
Response Surface Methodology ◽  
Aqueous Solutions ◽  
Response Surface ◽  
Sewage Treatment ◽  
Pharmaceutical Products ◽  
Quadratic Equation ◽  
Equation Model ◽  
Maximum Adsorption Capacity ◽  
Multiwalled Carbon ◽  
Isotherm Study

Antibiotics and pharmaceutical products cannot remove by conventional sewage treatment. In this work, an effective adsorbent magnetic multiwalled carbon nanotube (Fe3O4@MWCNTs) was synthesized by co-precipitation of MWCNTs with Fe3O4 and used for removal of Metronidazole from aqueous solutions. Response surface methodology on central composition design (CCD) was applied for designing of experiments and building of models for Metronidazole removal before a determination by HPLC. Four factors including pH, the adsorbent dose, time, and temperature were studied and used for the quadratic equation model to the prediction of optimal points.  By solvent the equation and considering the regression coefficient (R2 =0.9997), the optimal points obtained as follows: pH =2.98; adsorbent dosage =2.16 g; time =22 min and temperature = 37.9 o C. The isotherm study of adsorption showed that the metronidazole adsorption on Fe3O4@MWCNTs follows the Langmuir model. The maximum adsorption capacity (AC) is 215 mg g-1 obtained from Langmuir isotherm.

scholarly journals USE OF ACTIVATED CHARCOAL AS BIO-ADSORBENT FOR TREAMENT OF RESIDUAL WATERS: A REVIEW

Nativa ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 215-221
Author(s):  
Lucélio Mendes Ferreira ◽  
Rafael Rodolfo de Melo
Keyword(s):  
Environmental Management ◽  
Activated Charcoal ◽  
Contact Time ◽  
Water Adsorption ◽  
Adsorption Process ◽  
Industrial Effluents ◽  
Adsorption Models ◽  
Initial Concentration ◽  
Isotherm Adsorption ◽  
Removal Of Contaminants

ABSTRACT: Adsorption is gaining attention by becoming one of the most used technologies for the removal of contaminants from water. Adsorption with activated charcoal (AC) is an efficient method for treatment of effluents; the main advantage of AC production is the use of residues that would be inappropriate discarded. The objective of this work was to gather and organize the information available about the potential of using activated charcoal as a bio-adsorbent. Researches were conducted on scientific articles about the production of activated charcoal with adsorption characteristics for the removal of contaminants from residual waters. The efficiency of this technique is dependent on different parameters that affect the adsorption process, such as: pH of the solution, dye initial concentration, contact time, adsorbent amount, and temperature. The articles studied showed that the bio-adsorbent characteristics of charcoals are promising for the removal of pollutants from residual waters. The isotherm adsorption models developed by Langmuir, Freundlich, and Brunauer, Emmett, and Teller (BET) are often used to evaluate the adsorption capacity of activated charcoals. Keywords: industrial effluents; contaminants; environmental management.   Emprego do carvão ativado como bioadsorvente para o tratamento de águas residuais: uma revisão   RESUMO: A adsorção vem ganhando destaque com uma das tecnologias mais empregadas na remoção de contaminantes em águas. No tratamento de efluentes, a adsorção com carvão ativado (CA) apresenta-se como um método eficiente. A principal vantagem da produção de CA é o aproveitamento de resíduos que seriam descartados de forma inadequada. O objetivo desta pesquisa é organizar algumas informações disponíveis com relação ao potencial do carvão ativado como bioadsorvente. Foram realizadas pesquisas em periódicos sobre produção de carvão ativado com características adsortivas na remoção de contaminantes em águas residuais. A eficácia dessa técnica sob diferentes parâmetros influencia no processo de adsorção, tais como: pH da solução, concentração inicial do corante, tempo de contato, quantidade do adsorvente e temperatura. Em todos os artigos estudados, as características dos carvões como bioadsorventes se mostraram promissores no processo para remoção de poluentes em águas residuais. Conclui-se que os modelos de isotermas de adsorção desenvolvidos por Langmuir, Freundlich e BET são frequentemente utilizados para avaliar a capacidade de adsorção dos carvões ativados. Palavras-chave: efluentes industriais; contaminantes; gestão ambiental.

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 THE ADSORPTION OF Pb(II) AND Cr(III) BY POLYPROPYLCALIX[4]ARENE POLYMER

2010 ◽  
Vol 9 (3) ◽  
pp. 437-444 ◽  
Author(s):  
Suryadi Budi Utomo ◽  
Jumina Jumina ◽  
Tutik Dwi Wahyuningsih
Keyword(s):  
Metal Binding ◽  
Adsorption Equilibrium ◽  
Yellow Crystal ◽  
Maximum Adsorption Capacity ◽  
Adsorption Model ◽  
Heavy Metal Cations ◽  
Optimum Ph ◽  
Isotherm Adsorption ◽  
Pseudo Second Order ◽  
Relative Molecular Weight

A research has been conducted to investigate the adsorption behavior of Pb(II) and Cr(III) onto polypropylcalix[4]arene polymer. The polypropylcalix[4]arene polymer was synthesized in the presence of H2SO4 catalyst and chloroform under N2 condition for 5 h using 25-allyloxy-26,27,28-trihydroxycalyx[4]arene as the precursor. The Polymer was obtained as yellow crystal with melting point of  288-290 °C and its relative molecular weight was 44.810 g.mol-1. The application of polypropylcalix[4]arene for trapping heavy metal cations and its adsorption model were examined by stirring the suspension of the calixarene in the sample solutions for various pH, time, and concentration of Pb(II) and Cr(III) solution. Effect of pH on batch experiments for the mentioned ions indicated that the optimum pH for metal binding were 5 for lead(II) and chromium(III). The adsorption model of metal ions on polypropylcalix[4]arene followed both the pseudo second order adsorption of Ho's and Langmuir isotherm adsorption kinetics models with rate constant (k) were 6.81 x 101 min-1 for Pb(II) and 2.64 x 10-2 min-1 for Cr(III). The adsorption equilibrium constant, K, were 5.84 x 105 L.mol-1 for Pb(II) and 4.66 x 105 L.mol-1 for Cr(III). The maximum adsorption capacity of polypropylcalix[4]arene to Pb(II) and Cr(III) were 16.31 and 18.14 mg.g-1 with adsorption energy of 32.90 and 32.34 kJ.mol-1, respectively.   Keywords: polypropylcalix[4]arene, adsorption, Pb(II), and Cr(III)

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