scholarly journals Development of PANI/BN-based absorbents for water remediation

2019 ◽  
Vol 54 (4) ◽  
pp. 290-298
Author(s):  
Muhammad Arsalan ◽  
Azka Awais ◽  
Tingting Chen ◽  
Qinglin Sheng ◽  
Jianbin Zheng
Keyword(s):  
Adsorption Process ◽  
Binding Capacity ◽  
Order Equation ◽  
Langmuir Model ◽  
Water Remediation ◽  
Ionic Bond ◽  
Adsorption Performance ◽  
Optimum Ph ◽  
Pseudo Second Order ◽  
Bond Effect

Abstract In this research, novel PANI/BN-based absorbent was prepared by bonding polyaniline and bentonite for water remediation and their structures were characterized by scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The effect of pH, concentration of metal, and dosage amount on synthesized novel PANI/BN-based absorbent was investigated in detail. The result indicated that the PANI/BN-based absorbent has an excellent adsorption performance towards Cu, Pb, and Ni, and the highest binding capacity of 130 mg g−1 for Ni was obtained under normal conditions. The adsorption of PANI/BN absorbent was found to depend on pH when pH < 7.0, but the adsorption has been found independent from the ionic bond effect. The adsorption at optimum pH for Cu (pH 6) and Pb (pH 5) was observed as 85 mg g−1 and 105 mg g−1, respectively. The best results collected at those conditions of isotherm data and adsorption kinetics are represented by the Langmuir model and pseudo-second order equation, respectively. Thermodynamic results (ΔH > 0, ΔS > 0, ΔG < 0) showed that the adsorption process of Cu, Ni, and Pb is significantly increased by the synthesized novel PANI/BN-based absorbent.

scholarly journals Investigation of competitive adsorption and desorption of heavy metals from aqueous solution using raw rock: Characterization kinetic, isotherm, and thermodynamic

2021 ◽  
Vol 348 ◽  
pp. 01016
Author(s):  
Rajaa Bassam ◽  
Marouane El Alouani ◽  
Nabila Jarmouni ◽  
Jabrane Maissara ◽  
Mohammed El Mahi Chbihi ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Adsorption Process ◽  
Freundlich Isotherm ◽  
Langmuir Model ◽  
Second Order ◽  
Isotherm Models ◽  
Desorption Process ◽  
Pseudo Second Order ◽  
Rock Characterization ◽  
Metals Adsorption

Heavy metals are the most dangerous inorganic pollutants Due to their bioaccumulation and their nonbiodegradability, for this, several studies have focused on the recovery of these metals from water using different techniques. In this context, our study consists of evaluating an efficient and eco-friendly pathway of competitive recovery of heavy metals (Cd, Cr and As) from aqueous solutions by adsorption using raw rock. This adsorbent was characterized before and after the adsorption process by several techniques. The multi-metals adsorption process in the batch mode was undertaken to evaluate the effect of adsorbent mass, contact time, pH, Temperature, and initial heavy metals concentration. The kinetic data were analyzed using the pseudo-first-order, pseudo-second-order and intra-particle diffusion kinetic models. According to the modeling of the experimental results, the adsorption kinetics of heavy metals were adapted to the pseudo-second-order model. The adsorption isotherms were evaluated by the Langmuir and Freundlich isotherm models. The experimental isotherm data of heavy metals were better fitted with the Langmuir model rather than Freundlich isotherm models. The maximum experimental adsorption capacities (Qmax) predicted by the Langmuir model are 15.23 mg/g for Cd (II), 17.54 mg/g for Cr (VI) and 16.36 mg/g for As (III). The values of thermodynamic parameters revealed that the heavy metals adsorption was exothermic, favorable, and spontaneous in nature. The desorption process of heavy metals showed that this raw rock had excellent recycling capacity. Based on the results, these untreated clays can be used as inexpensive and environmentally friendly adsorbents to treat water contaminated by heavy metals.

scholarly journals Utilization of Lapindo Volcanic Mud for Enhanced Sono-sorption Removal of Acid Orange 52

2019 ◽  
Vol 14 (1) ◽  
pp. 189
Author(s):  
Nur Hidayatul Nazirah Kamarudin ◽  
Herma Dina Setiabudi ◽  
Aishah Abdul Jalil ◽  
Siti Hazirah Adam ◽  
Nur Fatien Muhamad Salleh
Keyword(s):  
Adsorption Process ◽  
Order Equation ◽  
Reaction Engineering ◽  
Adsorption Method ◽  
Adsorption Ability ◽  
Acid Orange ◽  
Isotherm Study ◽  
Sorption Method ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order

This study applied ultrasonic irradiation technique to remove acid orange 52 (AO52) and in the meantime utilizing the potential adsorbent, Lapindo volcanic mud (LVM). LVM was collected from the erupted mud in Sidoarjo, Indonesia and calcined prior the adsorption process. Previously in another study, Lapindo was proven to be efficient for adsorption of dyes in single adsorption method. In this study, the combination of adsorption with ultrasound, or as known as sono-sorption shows that the adsorptivity increased from 95.54 mg/g to 129.5 mg/g. The isotherm study shows that this process obeyed Langmuir isotherm model with adsorption capacity of 833.33 mg/g. The enhancement of sono-sorption method as compared to conventional method is believed to be resulted from the facilitated mass transfer driven by the ultrasound, along with the adsorption ability of LVM. The kinetic study fit to the pseudo second order equation. Copyright © 2019 BCREC Group. All rights reservedReceived: 1st October 2018; Revised: 22nd December 2018; Accepted: 7th January 2019; Available online: 25th January 2019; Published regularly: April 2019How to Cite: Kamarudin, N.H.N., Setiabudi, H.D., Jalil, A.A., Adam, S.H., Salleh, N.F.M. (2019). Utilization of Lapindo Volcanic Mud for Enhanced Sono-sorption Removal of Acid Orange 52. Bulletin of Chemical Reaction Engineering & Catalysis, 14 (1): 189-195 (doi:10.9767/bcrec.14.1.3326.189-195)Permalink/DOI: https://doi.org/10.9767/bcrec.14.1.3326.189-195  

scholarly journals Removal of Cd(II) Ions from Simulated Wastewater by HCl Modified Cucumis sativus Peel: Equilibrium and Kinetic Study

2014 ◽  
Vol 7 ◽  
pp. ASWR.S16488 ◽  
Author(s):  
Ruchi Pandey ◽  
Nasreen Ghazi Ansari ◽  
Ram Lakhan Prasad ◽  
Ramesh Chandra Murthy
Keyword(s):  
Cucumis Sativus ◽  
Adsorption Process ◽  
Order Reaction ◽  
Ion Concentration ◽  
Second Order Reaction ◽  
Monolayer Adsorption ◽  
Optimum Ph ◽  
Pseudo Second Order ◽  
Simulated Wastewater ◽  
Maximum Removal

This paper describes the adsorption of Cd(II) ions from aqueous solutions by modified Cucumis sativus peel (CSP) by HCl treatment. The optimum pH, adsorbent mass, contact time, and initial ion concentration were determined. The maximum removal efficiency was 84.85% for 20 mg/L Cd(II) ion at pH 5. The adsorption isotherms were obtained using concentrations of the metal ions ranging from 5 to 150 mg/L. The adsorption process follows Langmuir isotherm and pseudo-second-order reaction kinetics. CSPs exhibit monolayer adsorption capacity of 58.14 mg/g at 298 K. The paper also discusses the thermodynamic parameters of the adsorption (the Gibbs free energy, entropy, and enthalpy). Our results establish that the adsorption process was spontaneous and endothermic under normal conditions.

Adsorption of Congo Red from Aqueous Solution onto Chitosan/Rectorite Composite

2013 ◽  
Vol 690-693 ◽  
pp. 438-441 ◽  
Author(s):  
Tao Feng ◽  
Lei Xu
Keyword(s):  
Aqueous Solution ◽  
Adsorption Kinetics ◽  
Congo Red ◽  
Adsorption Process ◽  
Order Equation ◽  
Interlayer Distance ◽  
Kinetics Studies ◽  
Pseudo Second Order ◽  
Cr Concentration ◽  
Cr Uptake

The chitosan/rectorite composite was prepared and characterized by XRD. The interlayer distance of rectorite was enlarged from 2.53 nm to 3.01 nm. Congo red (CR) was selected as a model anionic dye and the adsorption tests of CR onto chitosan/rectorite composite were carried out. The results showed that the CR adsorption process is dependent on pH and initial CR concentration and temperature. The maximal CR uptake by chitosan/rectorite composite was 73.8 mg g-1 in the test. Adsorption kinetics studies indicated that the sorption processes were better fitted by pseudo-second order equation.

scholarly journals Corn stalk as starting material to prepare a novel adsorbent via SET-LRP and its adsorption performance for Pb(II) and Cu(II)

2020 ◽  
Vol 7 (3) ◽  
pp. 191811
Author(s):  
Yazhen Wang ◽  
Shuang Li ◽  
Liqun Ma ◽  
Shaobo Dong ◽  
Li Liu
Keyword(s):  
Adsorption Capacity ◽  
Potassium Hydroxide ◽  
Adsorption Process ◽  
Hydroxylamine Hydrochloride ◽  
Freundlich Isotherm ◽  
Maximum Adsorption Capacity ◽  
Corn Stalk ◽  
Order Model ◽  
Adsorption Performance ◽  
Pseudo Second Order

Corn stalk was used as the initial material to prepare a corn stalk matrix-g-polyacrylonitrile-based adsorbent. At first, the corn stalk was treated with potassium hydroxide and nitric acid to obtain the corn stalk-based cellulose (CS), and then the CS was modified by 2-bromoisobutyrylbromide (2-BiBBr) to prepare a macroinitiator. After that, polyacrylonitrile (PAN) was grafted onto the macroinitiator by single-electron transfer living radical polymerization (SET-LRP). A novel adsorbent AO CS-g-PAN was, therefore, obtained by introducing amidoxime groups onto the CS-g-PAN with hydroxylamine hydrochloride (NH 2 OH · HCl). FTIR, SEM and XPS were applied to characterize the structure of AO CS-g-PAN. The adsorbent was then employed to remove Pb(II) and Cu(II), and it exhibited a predominant adsorption performance on Pb(II) and Cu(II). The effect of parameters, such as temperature, adsorption time, pH and the initial concentration of metal ions on adsorption capacity, were examined in detail during its application. Results suggest that the maximum adsorption capacity of Pb(II) and Cu(II) was 231.84 mg g –1 and 94.72 mg g −1 , and the corresponding removal efficiency was 72.03% and 63%, respectively. The pseudo-second order model was more suitable to depict the adsorption process. And the adsorption isotherm of Cu(II) accorded with the Langmuir model, while the Pb(II) conformed better to the Freundlich isotherm model.

scholarly journals Thermodynamic and kinetics studies of the adsorption of phosphorus by bioretention media

2012 ◽  
Vol 16 (5) ◽  
pp. 1506-1509 ◽  
Author(s):  
Ying Mei ◽  
Xiao-Hua Yang ◽  
Ya-Nan Guo ◽  
Jun He ◽  
Rong Jiang ◽  
...  
Keyword(s):  
Adsorption Process ◽  
Physical Nature ◽  
Order Equation ◽  
Second Order ◽  
Isothermal Adsorption ◽  
Phosphorus Adsorption ◽  
Removal Capacity ◽  
Pseudo Second Order ◽  
The Media ◽  
The Mean

The objective of this study is to explore the mechanism of phosphorus adsorption in the bioretention media. The phosphorus adsorption characteristics of four media of bioretention are studied by four isothermal adsorption experiments. The result indicate that the maximal adsorption capacity (qm) of phosphorus of the four bioretention media are found to be media I (0.3365 mg/g), media II (0.3302 mg/g), media III (0.2751 mg/g) and media IV 0.8435 mg/g), respectively. The negative values of Gibbs free energy of phosphorus indicate that each of the phosphorus adsorption process by the four bioretention media is a spontaneous process. The mean sorption energies obtained from DR isotherm were 0.0758, 0.0772, 0.0803 and 0.0632 kJ/mol respectively, which indicate the physical nature of the adsorbate/adsorbent interactions. Two kinetic models including pseudo first-order and pseudo second-order equation were selected to follow the adsorption process. The results showed that the adsorption of phosphorus with the four types of bioretention media could be described by the pseudo second-order equation. The media IV was the better media of bioretention with high phosphorus removal capacity.

Kinetic and Equilibrium of Biosorption of Methylene Blue by Sunflower Straw

2012 ◽  
Vol 610-613 ◽  
pp. 194-197
Author(s):  
Li Ping Chen ◽  
Si Qin Dalai
Keyword(s):  
Methylene Blue ◽  
Ph Value ◽  
Low Cost ◽  
Order Equation ◽  
Solution Ph ◽  
Biosorption Process ◽  
Optimum Ph ◽  
Pseudo Second Order ◽  
Batch Biosorption ◽  
Sunflower Straw

With sunflower straw as low-cost biosorbent, the biosorption of methylene blue (MB) from aqueous solution was studied by batch biosorption technique. The biosorption experiments were carried out under different conditions of solution pH, sunflower straw dose, and temperature. The results showed that biosorption of MB on to sunflower straw affected remarkably by the pH value, and the maximum biosorption amount was achieved at an optimum pH of 12.0; the equilibrium biosorption amount decreased as temperature was increasing, and the biosorption process might be depicted primly by Langmuir function; It was shown that the biosorption of methylene blue could be described by the pseudo-second-order equation.

scholarly journals Adsorption of Remazol Brilliant Blue R Using Amino-Functionalized Organosilane in Aqueous Solution

2017 ◽  
Vol 17 (3) ◽  
pp. 343 ◽  
Author(s):  
Ozi Adi Saputra ◽  
Alifia Harista Rachma ◽  
Desi Suci Handayani
Keyword(s):  
Adsorption Process ◽  
Morphological Structure ◽  
Brilliant Blue ◽  
Kinetic Rate ◽  
Isotherm Study ◽  
Remazol Brilliant Blue R ◽  
Infra Red ◽  
Optimum Ph ◽  
Isotherm Adsorption ◽  
Pseudo Second Order

Synthesis of amino functionalized organosilane (AFOS) via UV-irradiation method has been conducted. In this research, the precursors for synthesizing AFOS are 3-glycydiloxypropyl trimethoxysilane (GPTMS) and ethylene diamine. Synthesis of amino functionalized organosilane was performed for 16 h monitored by Infra-red spectroscopy technique. The morphological structure of AFOS was observed by scanning electron microscopy. The adsorption process was conducted in the batch method using Remazol Brilliant Blue R (RBBR) as anionic dye model. In this study, the pH, contact time and dyes concentration were varied to determine the optimum pH, kinetic and isotherm adsorption. Based on the calculation, the kinetic rate of the RBBR adsorbed onto AFOS was determined by k2 (pseudo second-order). Moreover, the isotherm study showed that the Langmuir model fitted for the adsorption of RBBR onto AFOS with Qm by 21.3 mg g-1.

scholarly journals The adsorption behavior and mechanism investigation of Cr(VI) ions removal by poly(2-(dimethylamino)ethyl methacrylate)/poly(ethyleneimine) gels

2015 ◽  
Vol 80 (7) ◽  
pp. 889-902 ◽  
Author(s):  
Zhengbo Hou ◽  
Weixia Zhu ◽  
Hang Song ◽  
Pengfei Chen ◽  
Shun Yao
Keyword(s):  
Photoelectron Spectroscopy ◽  
Adsorption Process ◽  
Interaction Mechanism ◽  
Langmuir Model ◽  
Adsorption Behavior ◽  
Maximum Adsorption Capacity ◽  
X Ray ◽  
Ethyl Methacrylate ◽  
Pseudo Second Order ◽  
Scanning Electron

The composite hydrogels based on N,N?-dimethylamino ethyl methacrylate (DMAEMA) and polyethyleneimine (PEI) were prepared by amino radical polymerization and confirmed by Fourier Transform Infrared Spectra (FTIR) and elemental analysis. Then adsorption behavior and mechanism of Cr(VI) ions on the obtained materials were investigated with scanning electron microscope, Zeta potential and thermal gravity analysis, etc. The adsorption process was found to follow the pseudo-second order kinetics and Langmuir model, and the maximum adsorption capacity of Cr(VI) ions reached 122.8 mg g-1. X-ray photoelectron spectroscopy (XPS) and pH analysis revealed that the Cr(VI) ions were adsorbed into the gels through electrostatic interaction mechanism, and SO42- in the solution had a great effect on the adsorption process. In addition, high pH and ionic strength could reduce the uptakes of adsorbate, which could be used for desorption of Cr(VI) ions from the gels.

scholarly journals Adsorption Kinetics and Equilibrium Isotherms Modeling of H2S on Hydrogel Biochar and Biochar Adsorbent from Rice Husk

2019 ◽  
Vol 8 (4) ◽  
pp. 6871-6878
Keyword(s):  
Rice Husk ◽  
Gas Flow ◽  
Adsorption Process ◽  
Order Equation ◽  
Gas Temperature ◽  
Gas Flow Rate ◽  
Nelson Model ◽  
Activated Biochar ◽  
Adsorption Processes ◽  
Pseudo Second Order

Hydrogen sulphide is a poisonous gas that is commonly found in swamps and areas of high volcanic activities. Due to the dangers and hazards that it may impose such as neurological disorders and miscarriages, continuous innovative attempts to remove the gas are in place. A study was conducted to synthesize an adsorbent that is made from activated rice husk biochar and also hydrogel biochar. This study is complementary to that study where the adsorption processes using the two adsorbents are mathematically modelled. Three parameters were studied which were the adsorbent mass, the gas flow rate, and the gas temperature. It was found that for rice husk-based activated biochar, for all three parameters, the adsorption processes could be mathematically represented using Thomas Model and Yoon-Nelson Model. Meanwhile, for rice husk-based hydrogel biochar, the adsorption process could be mathematically represented using Thomas and Yoon-Nelson Model for the effect of mass of adsorbent, and Adam-Bohart for the effect of gas flow rate and gas temperature. Although the coefficient of determination (R2) suggested that Thomas and Yoon-Nelson Model are more appropriate to be used to model the latter two parameters, because the exit concentration reached the point when it was greater than half the inlet concentration well before 0-th second, the linearly regressed equation became mathematically inconsistent with the isotherm models. Kinetic studies were also done, and it was found that the adsorption processes using the activated biochar fit both pseudo-first and pseudo-second order equation. This means that the adsorption processes using the activated biochar are both physisorption and chemisorption. Meanwhile, the adsorption processes using the hydrogel biochar fit only the pseudo-second order equation, suggesting that the adsorption process is chemisorption.

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