Synthesis and Characteristic Properties of Crosslinked Chitosan with Epichlorohydrin for Nitrate Removal from Water

2021 ◽  
Vol 21 (9) ◽  
pp. 4974-4979
Author(s):  
Seung Jae Lee ◽  
Kyung-Jun Hwang ◽  
Yongjoon Youn ◽  
Sang-Chai Kim ◽  
Soon-Do Yoon ◽  
...  
Keyword(s):  
Energy Distribution ◽  
Gas Adsorption ◽  
Nitrate Removal ◽  
Distribution Models ◽  
Chitosan Beads ◽  
Homogeneous Surface ◽  
Adsorption Behaviors ◽  
Isotherm Adsorption ◽  
Equilibrium And Kinetics ◽  
Nitrate Adsorption

In this study, we prepared chitosan beads cross-linked with epichlorohydrin (CB-ECH) to improve the removal of nitrate in groundwater. It was confirmed that CB-ECH exhibited higher thermal stability and well-developed nano-pores compared to the pure chitosan beads (CB) by the thermogravimetric analyzer, nitrogen gas adsorption and desorption isotherm, and field emission scanning microscopy analysis. The CB-ECH showed a higher nitrate adsorption amount than the pure CB. Nitrate adsorption behaviors of CB-ECH were further investigated using adsorption isotherm, adsorption kinetics, adsorption energy distribution, and Gibbs free energy distribution models. The adsorption equilibrium and kinetics of nitrate ion on CB-ECH were well explained by the Sips isotherm and homogeneous surface diffusion model, respectively. It was also found from the AED analysis that the CB-ECH represent the heterogeneous adsorption behaviors for nitrate.

Nitrate adsorption from aqueous solutions by calcined ternary Mg-Al-Fe hydrotalcite

2017 ◽  
Vol 75 (9) ◽  
pp. 2194-2203 ◽  
Author(s):  
Xiaowen Tong ◽  
Zhiquan Yang ◽  
Pan Xu ◽  
Ying Li ◽  
Xiaojun Niu
Keyword(s):  
Aqueous Solutions ◽  
Nitrate Removal ◽  
Inhibitory Effect ◽  
Molar Ratio ◽  
Batch Adsorption ◽  
Order Kinetic ◽  
Initial Ph ◽  
Isotherm Adsorption ◽  
Nitrate Adsorption ◽  
Co Precipitation

Calcined ternary hydrotalcite like compounds had been synthesized by co-precipitation and calcined at 450 °C for 6 h. It had been applied into the nitrate removal from aqueous solutions. Various factors during adsorption process, such as chemical composition of adsorbents, adsorbent dosage, initial concentration of nitrate, initial pH and co-existing anions on nitrate adsorption had been investigated. It was found that 1.5 g/L CHTlcs (Mg/Al/Fe molar ratio = 3:0.1:0.9) could achieve ideal adsorption efficiency at an initial nitrate concentration of 100 mg/L. The value of pH had little effect on nitrate adsorption. The co-existing anions had the inhibitory effect on nitrate adsorption, which was in the order of PO43− > SO42− > Cl− > ClO4−. The batch adsorption studies showed that experimental data were well described by the pseudo-second-order kinetic model and Langmuir isotherm model, and the maximum isotherm adsorption capacity was 123.305 mg/g. The adsorption of nitrate was a spontaneous exothermic process with the reduction of entropy. The proposed adsorption mechanism obtained from characterization was that CHTlcs uptake nitrate through reconstruction effect and adsorption on external surface.

EQUILIBRIUM AND KINETICS STUDY OF NITRATE REMOVAL FROM WATER BY PUROLITE A520-E RESIN

2012 ◽  
Vol 11 (1) ◽  
pp. 37-45 ◽  
Author(s):  
Liliana Lazar ◽  
Laura Bulgariu ◽  
Anca Ceica ◽  
Igor Cretescu ◽  
Ion Balasanian
Keyword(s):  
Nitrate Removal ◽  
Kinetics Study ◽  
Equilibrium And Kinetics

Nitrate removal from aqueous solutions by cross-linked chitosan beads conditioned with sodium bisulfate

2009 ◽  
Vol 166 (1) ◽  
pp. 508-513 ◽  
Author(s):  
Sudipta Chatterjee ◽  
Dae S. Lee ◽  
Min W. Lee ◽  
Seung H. Woo
Keyword(s):  
Aqueous Solutions ◽  
Nitrate Removal ◽  
Chitosan Beads ◽  
Sodium Bisulfate

In situ growth and optical gas adsorption performance of Zn(ii) metal–organic framework membranes at room temperature

The Analyst ◽  
2019 ◽  
Vol 144 (16) ◽  
pp. 4887-4896 ◽  
Author(s):  
Mariyemu Tuergong ◽  
Patima Nizamidin ◽  
Abliz Yimit ◽  
Rena Simayi
Keyword(s):  
Room Temperature ◽  
Gas Adsorption ◽  
Uv Light ◽  
Metal Organic Framework ◽  
Adsorption Behaviors ◽  
Uv Light Irradiation ◽  
Unit Surface ◽  
Metal Organic ◽  
First Time

The optical gas adsorption behaviors of [Zn2(bdc)2(dpNDI)]n membranes were studied for the first time. Under UV light irradiation, they exhibited a greater adsorption response to xylene gas with adsorption capacity of 6.46 μg cm−2 per unit surface.

scholarly journals First-Principles Investigation of the Adsorption Behaviors of CH2O on BN, AlN, GaN, InN, BP, and P Monolayers

Materials ◽  
2019 ◽  
Vol 12 (4) ◽  
pp. 676 ◽  
Author(s):  
Chuang Feng ◽  
Hongbo Qin ◽  
Daoguo Yang ◽  
Guoqi Zhang
Keyword(s):  
Charge Transfer ◽  
First Principles ◽  
Gas Adsorption ◽  
Indium Nitride ◽  
Single Layer ◽  
Boron Phosphide ◽  
Adsorption Behaviors ◽  
Gas Molecule ◽  
Adsorption Energies ◽  
Adsorption Systems

CH2O is a common toxic gas molecule that can cause asthma and dermatitis in humans. In this study the adsorption behaviors of the CH2O adsorbed on the boron nitride (BN), aluminum nitride (AlN), gallium nitride (GaN), indium nitride (InN), boron phosphide (BP), and phosphorus (P) monolayers were investigated using the first-principles method, and potential materials that could be used for detecting CH2O were identified. The gas adsorption energies, charge transfers and electronic properties of the gas adsorption systems have been calculated to study the gas adsorption behaviors of CH2O on these single-layer materials. The electronic characteristics of these materials, except for the BP monolayer, were observed to change after CH2O adsorption. For CH2O on the BN, GaN, BP, and P surfaces, the gas adsorption behaviors were considered to follow a physical trend, whereas CH2O was chemically adsorbed on the AlN and InN monolayers. Given their large gas adsorption energies and high charge transfers, the AlN, GaN, and InN monolayers are potential materials for CH2O detection using the charge transfer mechanism.

Heterogeneous Adsorption of Activated Carbon Nanofibers Synthesized by Electrospinning Polyacrylonitrile Solution

2006 ◽  
Vol 6 (11) ◽  
pp. 3577-3582
Author(s):  
Jae-Wook Lee ◽  
Hyun-Chul Kang ◽  
Wang-Geun Shim ◽  
Chan Kim ◽  
Kap-Seung Yang ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Energy Distribution ◽  
Carbon Nanofibers ◽  
Distribution Functions ◽  
Significant Information ◽  
Activated Carbon Nanofibers ◽  
Equilibrium And Kinetics ◽  
Adsorption Energy Distribution Functions ◽  
Energy Distribution Functions ◽  
Kinetics Of

This study focuses on the adsorption properties of activated carbon nanofibers (CNFs) fabricated by electrospinning polyacrylonitrile solutions dissolved in dimethylformamide, followed by heat treatment at high activation temperatures (700, 750, 800 °C). The samples were characterized by BET, SEM, and XRD. In addition, the adsorption energy distribution functions of CNFs were analyzed by using the generalized nonlinear regularization method. Comparative analysis of energy distribution functions provided significant information on the energetic and structural heterogeneities of CNFs. Furthermore, an investigation of adsorption equilibrium and kinetics of methylene blue (MB) and congo red (CR) revealed that the adsorption capacity and kinetics of MB are much higher and faster than that of CR on a given sample. Our experimental and theoretical results suggest that the CNFs used in this work may be widely used as an adsorbent.

scholarly journals Kinetic analysis of sucrose activated carbon for nutrient removal in water

2020 ◽  
Vol 3 (1) ◽  
pp. 208-220
Author(s):  
Sara Jamaliniya ◽  
O. D. Basu ◽  
Saumya Suresh ◽  
Eustina Musvoto ◽  
Alexis Mackintosh
Keyword(s):  
Activated Carbon ◽  
Kinetic Analysis ◽  
Adsorption Capacity ◽  
Nitrate Removal ◽  
Freundlich Isotherm ◽  
Langmuir Model ◽  
Phosphate Removal ◽  
Phosphate Adsorption ◽  
Isotherm Models ◽  
Nitrate Adsorption

Abstract A renewable, green activated carbon made from sucrose (sugar) was compared with traditional bituminous coal-based granular activated carbon (GAC). Single and multi-component competitive adsorption of nitrate and phosphate from water was investigated. Langmuir and Freundlich isotherm models were fitted to data obtained from the nitrate and phosphate adsorption experiments. Nitrate adsorption fits closely to either Freundlich or Langmuir model for sucrose activated carbon (SAC) and GAC with a Langmuir adsorption capacity of 7.98 and 6.38 mg/g, respectively. However, phosphate adsorption on SAC and GAC demonstrated a selective fit with the Langmuir model with an adsorption capacity of 1.71 and 2.07 mg/g, respectively. Kinetic analysis demonstrated that adsorption of nitrate and phosphate follow pseudo-second-order kinetics with rate constant values of 0.061 and 0.063 g/(mg h), respectively. Competitive studies between nitrate and phosphate were demonstrated in preferential nitrate removal with GAC and preferential phosphate removal with SAC. Furthermore, nitrate and phosphate removals decreased from 75% removal to 35% removal when subject to multi-component solutions, which highlights the need for adsorption analysis in complex systems. Overall, SAC proved to be competitive with GAC in the removal of inorganic contaminants and may represent a green alternative to coal-based activated carbon.

scholarly journals The Issue of the Free Surface of Adsorbent in the Description of a Monolayer Mobile Gas Adsorption on Solids

2019 ◽  
Vol 69 (4) ◽  
pp. 33-44
Author(s):  
Jerzy K. Garbacz ◽  
Jerzy Ciechalski ◽  
Mariusz Kozakiewicz
Keyword(s):  
Experimental Data ◽  
Free Surface ◽  
Theoretical Basis ◽  
Adsorption Layer ◽  
Gas Adsorption ◽  
Adsorption Equilibrium ◽  
Critical Parameters ◽  
Two Dimensional ◽  
Homogeneous Surface ◽  
Adsorption Equation

AbstractThis paper characterises the concept of monolayer mobile gas adsorption on a homogeneous surface of a solid. The theoretical basis of the phenomenological variant of the description of adsorption equilibrium in the system in question are discussed. The essential features of the solutions to date are discussed, and the effect of the free surface of adsorbent on the form of the final adsorption equation is stressed.An alternative concept of the free surface based on the modified two-dimensional analogue of Reiss, Frisch and Lebowitz equations is also presented. The obtained adsorption equation was tested for critical parameters of two-dimensional condensation of the adsorption layer, and then used to describe the experimental data available in literature. The verification carried out confirmed the correctness and usefulness of the proposed concept.

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