scholarly journals Adsorption Isotherm Studies of Rhodamine B on Citrus sinesis Peel

2018 ◽  
Vol 3 (1) ◽  
pp. 47-53
Author(s):  
Gani Purwiandono ◽  
Puji Lestari ◽  
Wahyu Widodo ◽  
Marlina Marlina ◽  
Nadia Aprilia
Keyword(s):  
Adsorption Isotherm ◽  
Rhodamine B ◽  
Adsorption Mechanism ◽  
Adsorption Process ◽  
Active Surface ◽  
Adsorption Model ◽  
Freundlich Model ◽  
Neutral Ph

Adsorption of Rhodamine B on Citrus sinesis peel biosorbent has been conducted. The adsorption process was carried out in neutral pH for 90 min. The active surface of the Citrus sinesis peel biosorbent was 15 m2/g and the density was 0.52 g/cm3. The adsorption mechanism of Rhodamine B on Citrus sinesis peel biosorbent was studied using 4 adsorption model; Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich. The adsorption fitted the Freundlich model with the regression value of 0.906. This indicates that the adsorption of Rhodamine B on the surface of Citrus sinesis peel biosorbent was a multilayer interaction.

scholarly journals Coexistence and Adsorption Properties of Heavy Metals by Polypropylene Microplastics

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Tingyu Fan ◽  
Jie Zhao ◽  
Yingxiang Chen ◽  
Miao Wang ◽  
Xingming Wang ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Photoelectron Spectroscopy ◽  
Adsorption Mechanism ◽  
Adsorption Process ◽  
Adsorption Properties ◽  
Primary Sources ◽  
Freundlich Model ◽  
X Ray ◽  
Sources Of Pollution ◽  
Best Fitting

Plastic particles with a diameter of 5 mm or less are called microplastics. Microplastics are one of the primary sources of pollution in the environment. It has been proven that microplastics are also carriers of heavy metals, but there are few studies on their adsorption mechanism. In this study, the adsorption of Pb, Cu, Cd, and Zn by polypropylene (PP) microplastics was analyzed and discussed. The morphology of PP was observed by scanning electron microscopy (SEM), the surface elemental composition of PP was determined by X-ray photoelectron spectroscopy (XPS), and the functional groups of PP were analyzed by Fourier transform infrared spectroscopy (FTIR). The results showed that the adsorption behavior of microplastics to different heavy metals could be balanced in 32 hours. Kinetics experiments showed that the adsorption process could be fitted well by a two-stage dynamic model, and the adsorption of Pb and Cu by PP is greater than that of Cd and Zn. The Freundlich model has the best fitting effect on Pb for the adsorption isothermal results. The Langmuir model showed that the process is favorable for adsorption. The adsorption of mixed heavy metals by microplastics showed that when the concentration of the mixed adsorption mass was low, the presence of a coexistence system promoted the adsorption of Zn and Cu by microplastics. With an increasing concentration, the adsorption of 4 heavy metals by microplastics is inhibited.

Synthesis of Modified Metal Organic Skeleton and Its Adsorption of Hydrochloric Acid Wastewater, Mercury and Arsenic in Water

2020 ◽  
Vol 12 (7) ◽  
pp. 1078-1089
Author(s):  
Hongna Xu ◽  
Liguo Jin ◽  
Yan Cheng
Keyword(s):  
Hydrochloric Acid ◽  
Adsorption Capacity ◽  
Adsorption Process ◽  
Thermal Method ◽  
Maximum Adsorption Capacity ◽  
Physical Analysis ◽  
Toxic Substances ◽  
Adsorption Model ◽  
Freundlich Model ◽  
Metal Organic

Metal organic skeleton (MOFs) is a kind of porous material composed of metal ions and organic ligands through coordination, which can be used to absorb a lot of toxic substances from waste water. In this research, UiO-66, UiO-66(Zr) and UiO-66(Zr)–2COOH were synthesized by solvent thermal method, and physical analysis was conducted on the adsorbent properties of the materials by means of XRD, IR, Zeta potential, etc. In the adsorption test of wastewater impurities, UiO-66(Zr)–2COOH was firstly taken as the research object. With the increase of the initial concentration of hydrochloric acid, the adsorption capacity of the organic skeleton was greatly increased. However, when the concentration increases further, the growth rate of adsorption decreases, and with the increase of temperature, the adsorption decreases further. The organic skeleton of Hg(II) adsorption process conforms to the secondary dynamic adsorption model. At the same time, the organic skeleton materials of Hg(II) has strong ability of recognition, the recognition of Hg(II) sex is much stronger than the Ni(II) identification. Uio-66(Zr) and UiO-66(Zr)–2COOH are selected for adsorption of As, and the adsorption process of the two kinds of materials of As is close to the Freundlich model(III). The ability of absorbing As(III) of these materials is stronger than the ability of As(V). At the same time, UiO-66(Zr)–2COOH shows higher adsorption capacity on the As(III), and maximum adsorption capacity is 220 mg/g.

Adsorption Equilibrium and Thermodynamics Behavior of Sodium Pentachlorophenol to Biomass-Derived Biochars at Two Pyrolytic Temperatures

2014 ◽  
Vol 955-959 ◽  
pp. 2243-2247
Author(s):  
Cai Xia Zhang ◽  
Yu Feng Jiang ◽  
Min Zhou ◽  
Xue Fei Hu ◽  
Uwamungu J. Yves
Keyword(s):  
Adsorption Isotherm ◽  
Adsorption Process ◽  
Bet Surface Area ◽  
Adsorption Model ◽  
Isotherm Equation ◽  
Freundlich Adsorption Isotherm ◽  
Equilibrium Data ◽  
Sodium Pentachlorophenate ◽  
Two Temperatures ◽  
Isotherm Equations

Wheat straws were pyrolyzed at two temperatures (200 and 400°C). For two biochar, the Scanning electron microscope (SEM) and the BET surface area were analyzed. The thermodynamics of sodium pentachlorophenate adsorption on biochar were examined. Adsorption isotherm of sodium pentachlorophenate on biochar was determined and correlated with two well-known isotherm equations (Langmuir and Freundlich adsorption isotherm equation). The equilibrium data for sodium pentachlorophenate adsorption were fitted well with the Freundlich adsorption model. The thermodynamic parameters of Gibbs free energy (△Gθ), enthalpy (△Hθ), and entropy (△Sθ) were also calculated, and the positive value of △Hθsuggests the endothermic nature of the adsorption, whereas the negative values of △Gθtend (s) to prove the spontaneous nature of the adsorption process.

scholarly journals Adsorption Study of Rhodamine B and Methylene Blue Dyes with ZSM-5 Directly Synthesized from Bangka Kaolin without Organic Template

2019 ◽  
Vol 20 (1) ◽  
pp. 130 ◽  
Author(s):  
Ani Iryani ◽  
Hadi Nur ◽  
Mardi Santoso ◽  
Djoko Hartanto
Keyword(s):  
Methylene Blue ◽  
Rhodamine B ◽  
Contact Time ◽  
Adsorption Process ◽  
Dye Adsorption ◽  
Standard Entropy ◽  
Order Kinetic ◽  
Adsorption Model ◽  
Isothermal Adsorption ◽  
Initial Concentration

Rhodamine B (RB) and Methylene Blue (MB) dyes adsorption using adsorbent ZSM-5 synthesized from Bangka kaolin were investigated in this study. The effects of the initial concentration, contact time and temperature on the adsorption process were also analyzed. The effect of the initial concentration and contact time played an important role in the adsorption process; however, the effect differs significantly in both dyes. The temperature plays little role in the dye adsorption process. The results showed the adsorption process occurred in ZSM-5 adhere to Langmuir isothermal adsorption model showing that the adsorption process occurred to be monolayer. Based on the kinetics studies, the pseudo-first-order kinetic model represents the adsorption kinetics that occurs for both dyes onto the synthesized ZSM-5. Thermodynamic parameters namely Gibbs free energy (ΔG°), standard entropy changes (ΔS°) and standard enthalpy (ΔH°) reveal that the adsorption process onto ZSM-5 for both dyes was spontaneous and exothermic.

scholarly journals Isoterm Adsorpsi Rhodamin B Pada Arang Aktif Kayu Linggua

Jurnal MIPA ◽  
2013 ◽  
Vol 2 (1) ◽  
pp. 40
Author(s):  
Stero H. Roring ◽  
Mariska M. Pitoi ◽  
Jemmy Abidjulu
Keyword(s):  
Activated Carbon ◽  
Adsorption Isotherm ◽  
Rhodamine B ◽  
Wood Waste ◽  
Batch Experiment ◽  
Adsorption Coefficient ◽  
Freundlich Model ◽  
Rhodamin B ◽  
Langmuir And Freundlich Models ◽  
Better Than

Telah dilakukan penelitian adsorpsi rhodamin B pada arang aktif yang dibuat dari kayu linggua. Penelitian ini bertujuan untuk menentukan koefisien adsorpsi arang aktif limbah gergajian kayu linggua terhadap zat warna rhodamin B dengan menggunakan isoterm adsorpsi Langmuir dan Freundlich. Penelitian dilakukan secara batch di mana 0,1; 0,2; 0,4; 0,7 dan 1 gram arang aktif dimasukkan ke dalam labu Erlenmeyer terpisah yang masing-masing telah berisi 100 mL larutan rhodamin B 100 ppm. Campuran kemudian diperlakukan di atas magnetic stirrer selama 50 menit dan selanjutnya konsentrasi larutan rhodamin B dianalisis menggunakan spektrofotometer UV-Vis. Hasil penelitian menunjukkan bahwa isoterm adsorpsi rhodamin B pada arang aktif kayu linggua lebih mengikuti isoterm adsorpsi Freundlich dengan koefisien adsorpsi 2,999x10-4 dan nilai intensitas adsorpsi 1,459.Adsorption isotherm of rhodamine B by activated carbon made from linggua wood waste was investigated. The adsorption isotherm was analyzed by Langmuir and Freundlich models. The isotherm was measured by batch experiment where 0,1; 0,2; 0,4; 0,7; and 1,0 grams where added into the separated Erlenmeyer flasks filled with 100 mL of 100 ppm rhodamine B. The mixtures were then treated on magnetic stirrers for 50 minutes followed by rhodamine B analysis using spectrophotometer UV-Vis. The result showed that the isotherm followed the Freundlich model better than Langmuir with the Freundlich adsorption coefficient of 2,999x10-4 and the Freundlich exponent of 1,459.

scholarly journals USE OF PHOSPHORIC ACID AS BIOADSORBENT ACTIVATOR OF KETAPANG LEAVES (Terminalia sp.) TO REDUCE RHODAMINE B CONTAMINANTS

Konversi ◽  
2021 ◽  
Vol 10 (2) ◽  
Author(s):  
Nadya Hasna ◽  
Dedy Suprayogi ◽  
Abdul Hakim
Keyword(s):  
Phosphoric Acid ◽  
Rhodamine B ◽  
Contact Time ◽  
Adsorption Process ◽  
Freundlich Isotherm ◽  
Acid Activation ◽  
Adsorption Model ◽  
Mass Variation ◽  
Batch System ◽  
Rhodamine B Dye

Ketapang contains tannin and phenolic compounds which are known to absorb metals and pollutants in the air. The purpose of this study was to determine the effectiveness of the biadsorbent from ketapang leaves (Terminalia sp.) on the adsorption of Rhodamine B dye without activation and with activation by 10% phosphoric acid. The study began with testing the variation of mass, time, and concentration of Rhodamine B by ketapang leaves. Then the adsorption process was carried out using a batch system and the concentration of the filtrate was measured using a UV-Vis spectrophotometer. Followed by the isotherm analysis of Freundlich and Langmuir. The results showed that the bioadsorbent ability of ketapang leaves without activation or with activation by 10% H3PO4 in terms of mass variation, contact time, and Rhodamine B concentration were 300 mg, contact time was 90 & 120 minutes, and Rhodamine B concentration was 10 mg/l. - 30 mg/l. The maximum bioadsorbent capacity of ketapang leaves (Qm) without activation was 3.7037 mg/g, while that of ketapang leaves with phosphoric acid activation was 1.0673 mg/g. The adsorption model used by the ketapang leaf bioadsorbent is the Freundlich isotherm where the R2 value close to 1 is 0.9573.

Experimental Study on Adsorption Mechanism of U(VI) by Modified CMC

2013 ◽  
Vol 650 ◽  
pp. 231-237
Author(s):  
Shu Kui Zhou ◽  
Guang Ming Zeng ◽  
Ying Jiu Liu ◽  
Hai Yang Jiang
Keyword(s):  
Adsorption Mechanism ◽  
Adsorption Process ◽  
Ph Value ◽  
Physical Adsorption ◽  
Order Kinetic ◽  
Freundlich Model ◽  
First Order ◽  
Batch System ◽  
Order Kinetic Model ◽  
Pseudo First Order

The modified carboxymethyl cellulose(CMC) was prepared and explored to adsorb uranium(Ⅵ) ions from aqueous solution in a batch system. The experimental results showed that on the condition of reaction temperature 70~80°C, CMC 30%-35% (w/w), CMC to AA (w/w) of 10:2.5 and reaction time 3.5-4 h, the modification effect was the best. High removal efficient of U(Ⅵ) was obtained 97.1% at temperature of 25°C, pH value of 5.0, dosage of modified CMC 0.1 g/L and contact time of 60 min. It was found that the adsorption process was best described by Freundlich model and pseudo-first-order kinetic model (R2=0.9618), indicating that the adsorption is mainly on the surface of the modified CMC. Thermodynamics parameters of negative value of ΔG0 and positive value of ΔH0 revealed the spontaneity and endothermic nature of the adsorption. The adsorption is primarily due to physical adsorption.

scholarly journals Removal of acid brown 354 from wastewater by aminized cellulose acetate nanofibers: experimental and theoretical study of the effect of different parameters on adsorption efficiency

2021 ◽  
Author(s):  
Mehran Namjoufar ◽  
Ali Farzi ◽  
Afzal Karimi
Keyword(s):  
Adsorption Isotherm ◽  
Cellulose Acetate ◽  
Adsorption Process ◽  
Theoretical Study ◽  
Adsorption Efficiency ◽  
Aquatic Life ◽  
Freundlich Model ◽  
Initial Concentration ◽  
Pseudo Second Order ◽  
Maximum Removal

Abstract Wastewater effluents usually involve dyes which are dangerous for aquatic life and other environments. Many of these dyes are toxic, carcinogenic, and can cause skin and eye irritation. In this study, firstly aminized cellulose acetate was prepared from cellulose acetate and applied for the adsorption of acid brown 354 from aqueous solutions. The effects of different parameters including adsorbent dosage, pH, temperature, and initial concentration of dye on adsorption capacity were examined. Results showed that removal efficiency of dye declined by increasing values of all parameters. Finally, maximum removal of dye was achieved in presence of 0.1 g adsorbent, pH of 2, and 10 mg/L of initial dye concentration at temperature of 25 °C. Also, different adsorption isotherms were investigated including Langmuir, Temkin, and Freundlich models and results demonstrated that the adsorption isotherm of dye followed Freundlich model with correlation coefficient of 0.988 revealing that the bond between dye and the adsorbent is strong. Finally, kinetic study indicated that the adsorption of dye is exactly governed by pseudo-second-order kinetics explaining that the adsorption process is chemical and the adsorbent can not be reused.

scholarly journals Simultaneous adsorption of phenol and nickel from wastewater using tea fiber waste

2018 ◽  
Vol 7 (3) ◽  
pp. 1904
Author(s):  
Gunjal Karania ◽  
Paridhi Singh ◽  
C R. Girish
Keyword(s):  
Particle Size ◽  
Adsorption Mechanism ◽  
Interaction Mechanism ◽  
Isotherm Models ◽  
Freundlich Model ◽  
Component System ◽  
Simultaneous Adsorption ◽  
Equilibrium Data ◽  
Fibre Waste ◽  
Type Of Behavior

The present work explores the potential of tea fibre waste as an adsorbent to remove phenol and nickel from wastewater in both single and binary component mode. The properties of the tea fibre such as surface area, pore volume and particle size were improved by treating with hydrochloric acid. The isotherm models were verified for single component system to find the adsorption mechanism. The equilibrium data were obeying Freundlich model. The simultaneous adsorption of two pollutants were carried out in order to evaluate the interaction mechanism such as synergic, antagonistic or non-interaction effect. It was observed that overall the system was exhibiting synergistic type of behavior.  

scholarly journals Adsorption of Phenol from Aqueous Solution Using Activated Carbon prepared from Coconut Shell

2017 ◽  
Vol 29 (1) ◽  
pp. 9-13
Author(s):  
Masuma Sultana Ripa ◽  
Rafat Mahmood ◽  
Sabrina Khan ◽  
Easir A Khan
Keyword(s):  
Aqueous Solution ◽  
Activated Carbon ◽  
Adsorption Isotherm ◽  
Iodine Number ◽  
Chemical Engineering ◽  
Coconut Shell ◽  
Physical Activation ◽  
Batch Adsorption ◽  
Adsorption Model ◽  
Solution Ph

Adsorption separation of phenol from aqueous solution using activated carbon was investigated in this work. The adsorbent was prepared from coconut shell and activated by physical activation method. The coconut shell was first carbonized at 800°C under nitrogen atmosphere and activated by CO2 at the same temperature for one hour. The prepared activated carbon was characterized by Scanning Electron Microscope (SEM) and BET Surface Analyzer and by the determination of iodine number as well as Boehm titration. The iodine number indicates the degree of relative activation of the adsorbent. The equilibrium adsorption isotherm phenol from aqueous solution was performed using liquid phase batch adsorption experiments. The effect of experimental parameters including solution pH, agitation time, particle size, temperature and initial concentration was investigated. The equilibrium data was analyzed using Langmuir and Freundlich adsorption model to describe the adsorption isotherm and estimate the adsorption isotherm parameters. The results indicate the potential use of the adsorbent for removal of phenol from the aqueous solution.Journal of Chemical Engineering, Vol. 29, No. 1, 2017: 9-13

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