scholarly journals Fabrication and Adsorption Optimization of Novel Magnetic Core-shell Chitosan/Graphene Oxide/β-cyclodextrin Composite Materials for Bisphenols in Aqueous Solutions

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5408
Author(s):  
Yichao Gong ◽  
Jianbing Su ◽  
Muyuan Li ◽  
Aixue Zhu ◽  
Guisui Liu ◽  
...  
Keyword(s):  
Composite Material ◽  
Graphene Oxide ◽  
Adsorption Mechanism ◽  
Raw Materials ◽  
Environmentally Friendly ◽  
Magnetic Core ◽  
Magnetic Composite ◽  
Order Kinetic ◽  
Mixed Solution ◽  
Adsorption Parameters

A novel magnetic composite material, Fe3O4@SiO2/chitosan/graphene oxide/β-cyclodextrin (MCGC), was prepared by multi-step methods. Various methods were used to systematically characterize the morphology, composition, structure, and magnetic properties of MCGC. The results obtained show that the composite material has good morphology and crystal structure and can be separated quickly by an external magnetic field. The operation is relatively easy, and the raw materials used to prepare this material are economical, easy to obtain, and environmentally friendly. The performance and adsorption mechanism for using this material as an adsorbent to remove bisphenol A (BPA) and bisphenol F (BPF) from water were studied. The adsorption parameters were optimized. Under optimal conditions, MCGC was found to remove more than 90% of BPA and BPF in a mixed solution (20 mg/L, 50 mL); the adsorption process for BPA and BPF on MCGC was found to follow a Redlich–Peterson isotherm model and Pseudo-second-order kinetic model. The adsorption mechanism for MCGC may involve a combination of various forces. Recycling experiments showed that after five uses, MCGC retained a more than 80% removal effect for BPA and BPF, and through real sample verification, MCGC can be used for wastewater treatment. Therefore, MCGC is economical, environmentally friendly, and easy to separate and collect, and has suitable stability and broad application prospects.

Synergetic Performance of Graphene Oxide and Chitosan on the Removal of Direct Red 7

2019 ◽  
Vol 35 (6) ◽  
pp. 1789-1798
Author(s):  
Sumathi Ganesan ◽  
Gurumallesh Prabu Halliah
Keyword(s):  
Graphene Oxide ◽  
Adsorption Mechanism ◽  
Kinetic Studies ◽  
Batch Adsorption ◽  
Order Kinetic ◽  
First Order ◽  
Plot Analysis ◽  
Monolayer Adsorption ◽  
Endothermic Process ◽  
Ft Ir

Graphene oxide/Chitosan (GOCH) composite was synthesized by hydrothermal method and structurally characterized by FT-IR, RAMAN, XRD and BET analyses which provide support for graphene oxide and chitosan incorporation. The synthesized composite was employed for the removal of direct red 7 (DR7) by batch adsorption process. Langmuir, Freundlich, Temkin, Dubinin-Radushkevic, Harkin-Jura, Scatchard plot analysis and Hasley isotherms were used to elucidate adsorption mechanism. The value of R2 revealed that isotherm was well explained by Langmuir model. The extent of monolayer adsorption capacity of GOCH was calculated as 34.2 mg/g. The pseudo first order kinetic studies were in agreement with experimental data. Thermodynamic parameters such as activation energy (Ea = 8.405 KJ/mol), enthalpy (ΔH = 89.417 KJ/mol), free energy change (ΔG) and entropy (ΔS = 0.2971 KJ/mol) were calculated. It propounded that the adsorption of DR7 on GOCH was favorable, spontaneous and an endothermic process.

scholarly journals Facile preparation of a tetraethylenepentamine-functionalized nano magnetic composite material and its adsorption mechanism to anions: competition or cooperation

RSC Advances ◽  
2018 ◽  
Vol 8 (19) ◽  
pp. 10686-10697 ◽  
Author(s):  
Meiqin Hu ◽  
Haoyu Shen ◽  
Si Ye ◽  
Yan Wang ◽  
Jiali Zhang ◽  
...  
Keyword(s):  
Composite Material ◽  
Adsorption Mechanism ◽  
Solvothermal Method ◽  
Magnetic Composite ◽  
One Pot ◽  
Facile Preparation

A tetraethylenepentamine (TEPA)-functionalized nano-Fe3O4 magnetic composite material (nFe3O4@TEPA) was synthesized by a facile one-pot solvothermal method.

scholarly journals Facile preparation and highly efficient sorption of magnetic composite graphene oxide/Fe3O4/GC for uranium removal

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Aili Yang ◽  
Zhijun Wang ◽  
Yukuan Zhu
Keyword(s):  
Aqueous Solution ◽  
Graphene Oxide ◽  
Adsorption Capacity ◽  
High Efficiency ◽  
Removal Rate ◽  
Low Cost ◽  
Hydrothermal Carbonization ◽  
Maximum Adsorption Capacity ◽  
Magnetic Composite ◽  
Order Kinetic

AbstractIn this work, we reported for the first time a novel magnetic composite graphene oxide/Fe3O4/glucose-COOH (GO/Fe3O4/GC) that was facilely prepared from glucose through the hydrothermal carbonization and further combination with graphene oxide (GO). The chemical and structural properties of the samples were investigated. By the batch uranium adsorption experiments, the magnetic composite GO/Fe3O4/GC exhibits an excellent adsorption performance and fast solid–liquid separation for uranium from aqueous solution. GO/Fe3O4/GC (the maximum adsorption capacity (Qm) was 390.70 mg g−1) exhibited excellent adsorption capacity and higher removal rate (> 99%) for U(VI) than those of glucose-COOH (GC) and magnetic GC (MGC). The effect of the coexisting ions, such as Na+, K+, Mg2+, Ca2+, and Al3+, on the U(VI) removal efficiency of GO/Fe3O4/GC was examined. The equilibrium sorption and sorption rate for the as-prepared adsorbents well fit the Langmuir model and pseudo second-order kinetic model, respectively. The thermodynamic parameters (ΔH0 = 11.57 kJ mol−1 and ΔG0 < 0) for GO/Fe3O4/GC indicate that the sorption process of U(VI) was exothermic and spontaneous. Thus, this research provides a facile strategy for the preparation of the magnetic composite with low cost, high efficiency and fast separation for the U(VI) removal from aqueous solution.

scholarly journals Adsorption Analysis of Fluoride Removal Using Graphene Oxide/Eggshell Adsorbent

2020 ◽  
Vol 20 (3) ◽  
pp. 579
Author(s):  
Norhusna Mohamad Nor ◽  
Nur Hidayahtul Nazrah Kamil ◽  
Amirul Izan Mansor ◽  
Hawaiah Imam Maarof
Keyword(s):  
Graphene Oxide ◽  
Second Order ◽  
Fluoride Removal ◽  
Order Kinetic ◽  
Adsorption Parameters ◽  
Fluoride Ions ◽  
Thermodynamic Studies ◽  
Adsorption Analysis ◽  
Order Kinetic Model ◽  
Pseudo Second Order

Graphene oxide with eggshells (GO/ES) adsorbent has been studied for fluoride ions (F–) removal. An adsorption study was conducted in batch experiments at different adsorption parameters, which are initial F– concentration, contact time, and temperature. The effects of these adsorption parameters towards F– removal by using GO/ES adsorbent were investigated. The adsorption parameters were then analyzed with adsorption isotherms (Langmuir and Freundlich), kinetics (pseudo-first-order and second-order) and thermodynamic studies. Under various parameters, GO/ES is proven as an effective adsorbent with an adsorption capacity of F– are up to 48 mg/g. The experimental data were satisfactorily fitted with Langmuir isotherm, which illustrated the monolayer pattern of F– adsorption into GO/ES adsorbent. The adsorption kinetic analysis indicated that the adsorption data could be well described by Pseudo-second-order kinetic model, which indicated the chemisorption process, while thermodynamic studies revealed that the adsorption of F– was an exothermic process.

Co nanoparticles decorated on N-doped rGO carbon aerogel as a highly efficient electrocatalyst for oxygen reduction

2019 ◽  
Vol 13 (01) ◽  
pp. 1950090 ◽  
Author(s):  
Xin Xu ◽  
Guopeng Feng ◽  
Fang Yuan
Keyword(s):  
Composite Material ◽  
Graphene Oxide ◽  
Oxygen Reduction ◽  
Freeze Drying ◽  
Raw Materials ◽  
Carbon Aerogel ◽  
Reduction Reaction ◽  
Ion Exchange Reaction ◽  
Ammonia Atmosphere ◽  
Co Nanoparticles

With sodium alginate and graphene oxide (GO) as raw materials, cobalt alginate/GO aerogel was prepared by ion-exchange reaction and subsequent freeze-drying technique. The aerogel was transported into a Co/N-rGO composite material through high-temperature carbonization at ammonia atmosphere. The Co/N-rGO composite material was then used for catalyzing oxygen reduction reaction in fuel cell and showed excellent catalytic activity and stability.

scholarly journals Fast Removal of Propranolol from Water by Attapulgite/Graphene Oxide Magnetic Ternary Composites

Materials ◽  
2019 ◽  
Vol 12 (6) ◽  
pp. 924 ◽  
Author(s):  
Yuehua Deng ◽  
Yani Li ◽  
Wenjie Nie ◽  
Xiang Gao ◽  
Lei Zhang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Kinetic Model ◽  
Adsorption Process ◽  
Freundlich Isotherm ◽  
Surface Characteristics ◽  
Magnetic Composite ◽  
Order Kinetic ◽  
Magnetic Graphene Oxide ◽  
Factors Affecting ◽  
Order Kinetic Model

In this work, a novel adsorbent attapulgite/graphene oxide magnetic composite (ATP/Fe3O4/GO) was synthesized for removing propranolol (PRO) from aqueous water. The factors affecting the PRO adsorption process onto ATP/Fe3O4/GO including pH, ionic strength, sorbent dosage, and humic acid were systematically investigated by batch experiments. Meanwhile, magnetic attapulgite (ATP/Fe3O4) and magnetic graphene oxide (GO/Fe3O4) were prepared for the comparison of the adsorption performance for PRO. The structural and surface characteristics of the resulting materials were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, zeta potential measurements, and scanning electron microscope. The results showed that the adsorption rate of PRO onto ATP/Fe3O4/GO was up to 99%, faster and higher than that of other adsorbents involved at neutral pH. Moreover, the adsorption kinetics were better fitted with pseudo-first-order kinetic model than the second-order kinetic model. The adsorption data were fitted well with the Freundlich isotherm equations, implying that the adsorption process was heterogeneous. The adsorption reaction was endothermic and spontaneous according to the thermodynamic parameters. All results indicated that ATP/Fe3O4/GO was a promising adsorbent for removing PRO from water.

scholarly journals Facile Preparation and Highly Efficient Sorption of Magnetic Composite Graphene Oxide/Fe3O4/GC for Uranium Removal

2021 ◽  
Author(s):  
Aili Yang ◽  
Zhijun Wang ◽  
Yukuan Zhu
Keyword(s):  
Aqueous Solution ◽  
Graphene Oxide ◽  
Adsorption Capacity ◽  
High Efficiency ◽  
Removal Rate ◽  
Low Cost ◽  
Hydrothermal Carbonization ◽  
Maximum Adsorption Capacity ◽  
Magnetic Composite ◽  
Order Kinetic

Abstract In this work, we reported for the first time a novel magnetic composite graphene oxide/Fe3O4/glucose-COOH (GO/Fe3O4/GC) that was facilely prepared from glucose through the hydrothermal carbonization and further combination with graphene oxide (GO). The chemical and structural properties of the samples were investigated. By the batch uranium adsorption experiments, the magnetic composite GO/Fe3O4/GC exhibits an excellent adsorption performance and fast solid-liquid separation for uranium from aqueous solution. GO/Fe3O4/GC (the maximum adsorption capacity (Qm) was 390.70 mg g-1) exhibited excellent adsorption capacity and higher removal rate (> 99%) for U(VI) than those of glucose-COOH (GC) and magnetic GC (MGC). The effect of the coexisting ions, such as Na+, K+, Mg2+, Ca2+, and Al3+, on the U(VI) removal efficiency of GO/Fe3O4/GC was examined. The equilibrium sorption and sorption rate for the as-prepared adsorbents well fit the Langmuir model and pseudo second-order kinetic model, respectively. The thermodynamic parameters (ΔH0 = 11.57 kJ mol-1 and ΔG0 < 0) for GO/Fe3O4/GC indicate that the sorption process of U(VI) was exothermic and spontaneous. Thus, this research provides a facile strategy for the preparation of the magnetic composite with low cost, high efficiency and fast separation for the U(VI) removal from aqueous solution.

Synthesis of Functionalized Magnetite Titanium Dioxide Nanocomposite for Removal of Acid Fuchsine Dye

2018 ◽  
Vol 21 (8) ◽  
pp. 583-593 ◽  
Author(s):  
Sara Rahnama ◽  
Shahab Shariati ◽  
Faten Divsar
Keyword(s):  
Titanium Dioxide ◽  
Removal Efficiency ◽  
Magnetic Core ◽  
Fractional Factorial ◽  
Order Kinetic ◽  
Sorption Data ◽  
Salt Addition ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Ft Ir

Objective: In this research, a novel magnetite titanium dioxide nanocomposite functionalized by amine groups (Fe3O4@SiO2@TiO2-NH2) was synthesized and its ability for efficient removal of Acid Fuchsine as an anionic dye from aqueous solutions was investigated. Method: The core-shell structure of Fe3O4@SiO2@TiO2 was prepared using Fe3O4 as magnetic core, tetra ethyl orthosilicate as silica and tetra butyl titanate as titanium source for shell. The synthesized nanocomposites (particle size lower than 44 nm) were characterized by FT-IR, XRD, DRS, SEM and TGA instruments. The various experimental parameters affecting dye removal efficiency were investigated and optimized using Taguchi fractional factorial design. Results: The synthesized adsorbent showed the highest removal efficiency of Acid Fuchsine (99 %) at pH= 3.5, without salt addition and during stirring at contact times less than 10 minutes. The study of kinetic models at two concentration levels showed the fast dye sorption on the surface of proposed nanocomposites with pseudo second order kinetic model (R2=1). Also, the fitting of Acid Fuchsine sorption data to Freundlich, Langmuir and Temkin isotherms suggested that Freundlich model gave a better fitting than other models (R2=0.9936, n=2). Conclusion: Good chemical stability, excellent magnetic properties, very fast adsorption kinetics and high removal efficiency make the synthesized nanocomposite as a proper recoverable sorbent for removal of Acid Fuchsine dye from wastewaters.

Nano-ZrO2/TiO2 Impregnated Orange Wood Sawdust and Peach Stone Shell Adsorbents for Cr (VI) Removal

2020 ◽  
Vol 16 (7) ◽  
pp. 880-892
Author(s):  
Şerife Parlayıcı ◽  
Kübra Tuna Sezer ◽  
Erol Pehlivan
Keyword(s):  
Contact Time ◽  
Ph Value ◽  
Order Kinetic ◽  
Adsorption Parameters ◽  
Wood Sawdust ◽  
Adsorption Data ◽  
Langmuir Isotherm Model ◽  
Pseudo Second Order ◽  
Ft Ir ◽  
Equilibrium Status

Background: In this work, Cr (VI) adsorption on nano-ZrO2๏TiO2 impregnated orange wood sawdust (Zr๏Ti/OWS) and nano-ZrO2๏TiO2 impregnated peach stone shell (Zr๏Ti/PSS) was investigated by applying different adsorption parameters such as Cr (VI) concentrations, contact time, adsorbent dose, and pH for all adsorbents. Methods: The adsorbents were characterized by SEM and FT-IR. The equilibrium status was achieved after 120 min of contact time and optimum pH value around 2 were determined for Cr (VI) adsorption. Adsorption data in the equilibrium is well-assembled by the Langmuir model during the adsorption process. Results: Langmuir isotherm model showed a maximum adsorption value of OWS: 21.65 mg/g and Zr๏Ti/OWS: 27.25 mg/g. The same isotherm displayed a maximum adsorption value of PSS: 17.64 mg/g, and Zr๏Ti/PSS: 31.15 mg/g. Pseudo-second-order kinetic models (R2=0.99) were found to be the best models for describing the Cr (VI) adsorption reactions. Conclusıon: Thermodynamic parameters such as changes in ΔG°, ΔH°, and ΔS° have been estimated, and the process was found to be spontaneous.

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