Biosorption of Nickel Ions by Modified Chitosan from Aqueous Solutions

2014 ◽  
Vol 472 ◽  
pp. 835-839 ◽  
Author(s):  
Wei Ma ◽  
Lian Lian Gao ◽  
Zi Hong Cheng ◽  
Ren Wang ◽  
Fu Jun Liu ◽  
...  
Keyword(s):  
Crosslinking Agent ◽  
Maximum Adsorption Capacity ◽  
Order Model ◽  
Chitosan Beads ◽  
Nickel Ions ◽  
Modified Chitosan ◽  
Intra Particle Diffusion ◽  
Pseudo Second Order ◽  
Model Equations ◽  
Main Model

Since commercial chitosan powder may dissolve in water to some degree and demands to be modified chemically to create its own exclusive pore canal we have synthetized two different modified chitosan beads in this investigation by using glutaraldehyde as crosslinking agent, significantly, novel porogen silica sol and methanol, and analysis means SEM, FTIR and BET demonstrated that the surface area and pore size improved signally. Moreover, the adsorption conditions pH and ionic strength have been considered, and the maximum adsorption capacity of nickel ions was 32.40 mg/g at the optimum condition. Furthermore, the main model equations on isotherm and kinetics have been deliberated and the results clearly revealed that Freundlich, external mass transfer, intra particle diffusion and pseudo second order model fitted better to the experimental data (R2> 0.99, all). It is expected that this results would be serviceable to remove metals from wastewater using chitosan and its derivatives.

Adsorption Characteristic of Steel Slag Haydite for Phosphorus Removal from Wastewater

2013 ◽  
Vol 690-693 ◽  
pp. 1033-1036 ◽  
Author(s):  
Xiao Liu ◽  
Mei Yang ◽  
Yong Yang
Keyword(s):  
Steel Slag ◽  
Phosphate Adsorption ◽  
Maximum Adsorption Capacity ◽  
Order Model ◽  
Adsorption Characteristic ◽  
Adsorption Data ◽  
Isotherm Adsorption ◽  
Intra Particle Diffusion ◽  
Pseudo Second Order ◽  
Increasing Temperature

Slag haydite made from steel slag and clay was used for phosphate adsorption, and adsorption characteristic was studied. Results showed that the uptake of phosphate was facilitated for pH 3-8, the adsorption process fitted with pseudo-second-order model and intra-particle diffusion model, and the equilibrium time was about 3h. Isotherm adsorption data on slag haydite were fitted by both the Freundlich and Langmuir models. It was found that the data follows the Langmuir model better, and the maximum adsorption capacity increased from 1.17mg·g-1 to 2.42mg·g-1 as temperature rose from 20°C to 40°C. Thermodynamic parameters G0, H0 andS0 showed that the adsorption was spontaneous, endothermic and entropy increase process and increasing temperature was favorable.

Monosodium Glutamate Functionalized Chitosan Beads for Adsorption of Precious Cerium Ion

2014 ◽  
Vol 970 ◽  
pp. 198-203 ◽  
Author(s):  
Megat Ahmad Kamal Megat Hanafiah ◽  
Zurhana Mat Hussin ◽  
Noorul Farhana Md Ariff ◽  
Wan Saime Wan Ngah ◽  
Shariff Che Ibrahim
Keyword(s):  
Kinetic Model ◽  
Monosodium Glutamate ◽  
Maximum Adsorption Capacity ◽  
Adsorption Efficiency ◽  
Order Model ◽  
Chitosan Beads ◽  
Cerium Ion ◽  
Optimum Ph ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order

Monosodium glutamate functionalized chitosan (MSGC) beads were synthesized and used as an adsorbent for recovering precious cerium ion from aqueous solutions. Several parameters which can affect adsorption efficiency such as effect of pH and adsorbent dosage have been investigated. The optimum pH for Ce (III) adsorption was 4. The rate of Ce (III) uptake was fast as the time to reach equilibrium was less than 10 min. Based on the applied kinetic model, Ce (III) adsorption onto MSGC fitted well with pseudo-second-order model. The maximum adsorption capacity recorded from the Langmuir isotherm model was 369.0 mg g-1 at 300 K.

scholarly journals Application of Scallop shell-Fe3O4 nanoparticles for the removal of Cr(VI) from aqueous solutions

2017 ◽  
Vol 75 (10) ◽  
pp. 2369-2380 ◽  
Author(s):  
Azita Mohagheghian ◽  
Robabeh Vahidi-Kolur ◽  
Melina Pourmohseni ◽  
Jae-Kyu Yang ◽  
Mehdi Shirzad-Siboni
Keyword(s):  
Removal Efficiency ◽  
Fe3o4 Nanoparticles ◽  
Maximum Adsorption Capacity ◽  
X Ray Diffraction ◽  
Scallop Shell ◽  
Order Model ◽  
Adsorbent Dosage ◽  
X Ray ◽  
Intra Particle Diffusion ◽  
Pseudo Second Order

In this study, removal of Cr(VI) by Scallop shell-Fe3O4 nanoparticles was investigated with variation of pH, adsorbent dosage, initial Cr(VI) concentration, ionic strength and temperature. Coating of Fe3O4 nanoparticles onto Scallop shell was identified by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy and energy dispersive X-ray analysis. The maximum adsorption was observed at pH 3. Removal efficiency of Cr(VI) was increased with increasing adsorbent dosage, but was decreased with increasing initial Cr(VI) concentration and temperature. Removal efficiency of Cr(VI) was decreased in the presence of sulfate and carbonate ions. Adsorption kinetic study revealed that a pseudo-second order model better described the removal data than a pseudo-first order model and an intra-particle diffusion model. Maximum adsorption capacity was estimated to be 34.48 mg/g. Thermodynamic studies indicated that adsorption of Cr(VI) onto Scallop shell-Fe3O4 nanoparticles occurred via an exothermic (ΔH = −320.88 KJ mol−1) process. Adsorption efficiency of Cr(VI) by Scallop shell-Fe3O4 nanoparticles was maintained even after eight successive cycles.

scholarly journals Equilibrium and Kinetic Study of Lead and Copper Ion Adsorption on Chitosan-Grafted-Polyacrylic Acid Synthesized by Surface Initiated Atomic Transfer Polymerization

Molecules ◽  
2018 ◽  
Vol 23 (9) ◽  
pp. 2218 ◽  
Author(s):  
Carlos Grande-Tovar ◽  
William Vallejo ◽  
Fabio Zuluaga
Keyword(s):  
Adsorption Capacity ◽  
Polyacrylic Acid ◽  
Adsorption Process ◽  
Kinetic Constant ◽  
Copper Ion ◽  
Toxic Metal ◽  
Maximum Adsorption Capacity ◽  
Order Model ◽  
Equilibrium Studies ◽  
Pseudo Second Order

In this work, we synthesized chitosan grafted-polyacrylic acid (CS-g-PA) through surface-initiated atom transfer radical polymerization (SI-ATRP). We also studied the adsorption process of copper and lead ions onto the CS-g-PA surface. Adsorption equilibrium studies indicated that pH 4.0 was the best pH for the adsorption process and the maximum adsorption capacity over CS-g-PA for Pb2+ ions was 98 mg·g−1 and for Cu2+ it was 164 mg·g−1, while for chitosan alone (CS), the Pb2+ adsorption capacity was only 14.8 mg·g−1 and for Cu2+ it was 140 mg·g−1. Furthermore, the adsorption studies indicated that Langmuir model describes all the experimental data and besides, pseudo-second-order model was suitable to describe kinetic results for the adsorption process, demonstrating a larger kinetic constant of the process was larger for Pb2+ than Cu2+. Compared to other adsorbents reported, CS-g-PA had comparable or even superior adsorbent capacity and besides, all these results suggest that the new CS-g-PA polymers had potential as an adsorbent for hazardous and toxic metal ions produced by different industries.

Preparation of bio-based magnetic adsorbent and application for efficient removal of Cd(II) from water

2018 ◽  
Vol 77 (5) ◽  
pp. 1313-1323 ◽  
Author(s):  
Jianjun Zhou ◽  
Xionghui Ji ◽  
Xiaohui Zhou ◽  
Jialin Ren ◽  
Yaochi Liu
Keyword(s):  
Aqueous Solution ◽  
Adsorption Process ◽  
Low Cost ◽  
Maximum Adsorption Capacity ◽  
Magnetic Adsorbent ◽  
Order Model ◽  
Efficient Removal ◽  
Adsorption Ability ◽  
Adsorption Sites ◽  
Pseudo Second Order

Abstract A novel magnetic bio-adsorbent (MCIA) was developed, characterized and tested for its Cd(II) removal from aqueous solution. MCIA could be easily separated from the solution after equilibrium adsorption due to its super-paramagnetic property. The functional and magnetic bio-material was an attractive adsorbent for the removal of Cd(II) from aqueous solution owing to the abundant adsorption sites, amino-group and oxygen-containing groups on the surface of Cyclosorus interruptus. The experimental results indicated that the MCIA exhibited excellent adsorption ability and the adsorption process was spontaneous and endothermic. The adsorption isotherm was consistent with the Langmuir model. The adsorption kinetic fitted the pseudo-second-order model very well. The maximum adsorption capacity of Cd(II) onto MCIA was 40.8, 49.4, 54.6 and 56.6 mg/g at 293, 303, 313 and 323 K, respectively. And the MCIA exhibited an excellent reusability and impressive regeneration. Therefore, MCIA could serve as a sustainable, efficient and low-cost magnetic adsorbent for Cd(II) removal from aqueous solution.

scholarly journals Removal of Crystal Violet Dye from Aqueous Solutions onto Date Palm Fiber by Adsorption Technique

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Mashael Alshabanat ◽  
Ghadah Alsenani ◽  
Rasmiah Almufarij
Keyword(s):  
Crystal Violet ◽  
Date Palm ◽  
Dye Removal ◽  
Adsorption Process ◽  
Maximum Adsorption Capacity ◽  
Order Model ◽  
Date Palm Fibers ◽  
Crystal Violet Dye ◽  
Pseudo Second Order ◽  
Influence Of Ph

The adsorption of crystal violet (CV) onto date palm fibers (DPFs) was examined in aqueous solution at 25°C. The experimental maximum adsorption capacity value was0.66×10−6. Langmuir, Freundlich, Elovich and Temkin models were applied to describe the equilibrium isotherms. The influence of pH and temperature on dye removal was evaluated. The percentage removal of CV dye by adsorption onto DPF at different pH and temperatures showed that these factors play a role in the adsorption process. Thermodynamic analysis was performed, and the Gibbs free energyΔGο, enthalpy changeΔHο, and entropyΔSοwere calculated. The negative values ofΔGοindicate spontaneous adsorption. The negative value ofΔHοindicates that the interaction between CV and DPF is exothermic, and the positive value ofΔSοindicates good affinity between DPF and CV. The kinetic data were fitted to a pseudo-second-order model.

scholarly journals Simultaneous Adsorption of Cr(VI) and Phenol from Binary Mixture Using Iron Incorporated Rice Husk: Insight to Multicomponent Equilibrium Isotherm

2016 ◽  
Vol 2016 ◽  
pp. 1-11 ◽  
Author(s):  
Ankur Gupta ◽  
Chandrajit Balomajumder
Keyword(s):  
Experimental Data ◽  
Rice Husk ◽  
Low Cost ◽  
Binary Solution ◽  
Multicomponent System ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Order Model ◽  
Adsorption Isotherm Models ◽  
Pseudo Second Order

Fe modified rice husk was prepared as a low cost biosorbent for the removal of Cr(VI) and phenol both singly and in combination from single and binary simulated synthetic waste water. Rice husk was modified by treating with FeSO4·7H2O. The results showed that impregnation of iron onto the surface of rice husk improved the adsorption capability of both Cr(VI) and phenol. The effects of process parameters for multicomponent system such as pH, adsorbent dose, and contact time onto the percentage removal of both Cr(VI) and phenol were investigated. The experimental data for the adsorption of both Cr(VI) and phenol onto the surface of Fe modified rice husk applied to various kinetic and adsorption isotherm models. Multicomponent isotherm models such as Nonmodified Langmuir, Modified Langmuir, Extended Langmuir, Extended Freundlich, Competitive Nonmodified Redlich Peterson, Competitive Modified Redlich Peterson were applied. The results show that Extended Freundlich model best described the experimental data for both Cr(VI) and phenol from binary solution. Pseudo second-order model agreed well with Cr(VI) while pseudo first-order model agreed well with phenol. Maximum adsorption capacity in synthetic binary solution of Cr(VI) and phenol was found to be 36.3817 mg g−1for Cr(VI) and 6.569 mg g−1for phenol, respectively.

Facile synthesis of chitosan nanoparticle-modified MnO2 nanoflakes for ultrafast adsorption of Pb(II) from aqueous solution

2016 ◽  
Vol 17 (1) ◽  
pp. 32-38 ◽  
Author(s):  
Tianli Han ◽  
Xiaoman Zhang ◽  
Xiangqian Fu ◽  
Jinyun Liu
Keyword(s):  
Aqueous Solution ◽  
Ph Value ◽  
Langmuir Model ◽  
Maximum Adsorption Capacity ◽  
Order Model ◽  
Facile Synthesis ◽  
Adsorption Sites ◽  
Chitosan Nanoparticle ◽  
Pseudo Second Order ◽  
Potential Strategy

Chitosan nanoparticle (CS NP)-modified MnO2 nanoflakes were presented as a novel adsorbent for fast adsorption of Pb(II) from aqueous solution. Loading dense CS NPs onto mono-dispersive flower-like MnO2 nanostructures reduces the overlap of CS during adsorption, and thus improves the contact of functional adsorption sites on the surface of MnO2 nanoflakes with heavy metal ions. The results show that the removal efficiency of the nanoadsorbents reaches up to 93% in 3 min for Pb(II). In addition, the maximum adsorption capacity, effects of adsorbent dosage and pH value, and the reusability were investigated. The kinetic process and adsorption isotherm fit well with the pseudo-second-order model and Langmuir model, respectively. These findings provide a potential strategy to address the overlap issue of some common nanoadsorbents.

Adsorption Kinetics of Zn(II) from Aqueous Solutions onto Epichlorohydrin Crosslinked Chitosan

2012 ◽  
Vol 463-464 ◽  
pp. 7-11 ◽  
Author(s):  
Ming Yan Dang ◽  
Hong Min Guo ◽  
Yan Kun Tan
Keyword(s):  
Aqueous Solutions ◽  
Adsorption Kinetics ◽  
Ph Value ◽  
Crosslinking Agent ◽  
Second Order ◽  
Order Model ◽  
Pseudo Second Order ◽  
Crosslinked Chitosan ◽  
Kinetics Of ◽  
Second Order Model

Chitosan was crosslinked using epichlorohydrin as crosslinking agent to prepare crosslinked chitosan which was used as an adsorbent for the removal of Zn(II) from aqueous solutions. The adsorption prosperities of Zn(II) on crosslinked chitosan were studied, including the influence of pH value and the adsorption kinetics. The kinetics of adsorption was discussed using two kinetic models, the pseudo first-order and the pseudo second-order model. Results reveal that the crosslinked chitosan is suitable as adsorbent to remove Zn(II) from dilute solution. The rate parameters for the Zn(II) by crosslinked chitosan were also determined. It was shown that the adsorption kinetics of Zn(II) could be best described by the pseudo second-order model and the adsorption process may involve a physical adsorption.

Biosorption of Acid Dyes Using Modified Chitosan: Effect of Dye Structure, Hydrogen Bonding and PH

2011 ◽  
Vol 236-238 ◽  
pp. 464-469 ◽  
Author(s):  
Zuo Hua Wang ◽  
Bo Xiang ◽  
Zheng Zhai ◽  
Yi Jiu Li
Keyword(s):  
Hydrogen Bonding ◽  
Aqueous Solutions ◽  
Sorption Kinetics ◽  
Acid Dyes ◽  
Order Model ◽  
Modified Chitosan ◽  
Ph Influence ◽  
Pseudo Second Order ◽  
Acid Orange 10 ◽  
Acid Green 25

This work investigated sorption properties of diethylenetriamine derivative of chitosan (CTSN) for removal of acid dyes (Acid Green 25 (AG25), Acid Red 18 (AR18) and Acid Orange 10 (AO10)) from aqueous solutions. Sorption kinetics was firstly evaluated. It was found that pseudo-second-order model fits well with these dyes adsorbed on CTSN. Compared with normal chitosan, CTSN has higher capacity for AR18 and AO10, but a lower value for AG25. Mechanisms and interactions of dyes with CTSN were also discussed by study the effect of pH, influence of hydrogen-bonding and comparing the sorption capacities.

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