Oxide Hydrogel Research Articles

Metal Oxide Hydrogel Composites for Remediation of Dye-Contaminated Wastewater: Principal Component Analysis.

Water pollution is caused by multiple factors, such as industrial dye wastewater. Dye-contaminated water can be treated using hydrogels as adsorbent materials. Recently, composite hydrogels containing metal oxide nanoparticles (MONPs) have been used extensively in wastewater remediation. In this study, we use a statistical and artificial intelligence method, based on principal component analysis (PCA) with different applied parameters, to evaluate the adsorption efficiency of 27 different MONP composite hydrogels for wastewater dye treatment. PCA showed that the hydrogel composites CTS@Fe3O4, PAAm/TiO2, and PEGDMA-rGO/Fe3O4@cellulose should be used in situations involving high pH, time to reach equilibrium, and adsorption capacity. However, as the composites PAAm-co-AAc/TiO2, PVPA/Fe3O4@SiO2, PMOA/ATP/Fe3O4, and PVPA/Fe3O4@SiO2, are preferred when all physical and chemical properties investigated have low magnitudes. To conclude, PCA is a strong method for highlighting the essential factors affecting hydrogel composite selection for dye-contaminated water treatment.

Histidine-Triggered GO Hybrid Hydrogels for Microfluidic 3D Printing.

Graphene oxide (GO) hydrogels have provided tremendous opportunities in designing and fabricating complex constructs for diverse applications, while their 3D printing without photocuring is still a challenging task due to their low viscosity, uncontrollable gelation, and low interfacial tension. Here, we report a histidine-assisted printing strategy to prepare GO hybrid hydrogels through the microfluidic 3D printing technique. We found that the GO additive could significantly hamper the Knoevenagel condensation (KC) reaction between benzaldehyde and cyanoacetate group-functionalized polymers to form a hydrogel, while these GO mixed solutions were rapidly solidified into a hydrogel when histidine was added. This fascinating phenomenon enabled us to prepare low-viscosity GO mixed polymer solutions as printable inks and generate hydrogel microfibers in histidine solutions. The hydrogel fibers could support cell survival and be further constructed into complex 3D structures through microfluidic 3D printing techniques. Moreover, due to the addition of GO, the microfibers exhibited excellent electrical conductivity and could sense the motion changes and convert these stimuli as electrical resistance signals. This strategy adds an option for the design and application of 3D printable aqueous GO inks in many fields.

Texture and rheological features of strain and pH sensitive chitosan-imine graphene-oxide composite hydrogel with fast self-healing nature

Here we report a smart Chitosan-isophthalaldehyde-Graphene oxide (CS-ISD-GO) hydrogel as a “multicomponent hydrogel”. We witnessed an unprecedented pH responsive changes in viscoelasticity, stretchability, adhesiveness, self-healing and self-adaptability upon changing the pH and concentration of CS and ISD that was authenticated by texture and rheological analysis. The GO provides physical crosslinks and antibacterial properties to the hydrogel. Taking the advantage of dynamic nature of covalent and non-covalent interactions, we tuned the hydrogel adhesion and stretchability in response to the pH changes. Further self-healing of hydrogels was fully investigated by measuring thixotropic response over more than three cycles of strain sweep and real time optical imaging and video recording techniques. The recorded videos display 100 % self-healing response within a time frame of 2–6 min. These properties were observed only over small range of pH (4.5–5.5). The hydrogel becomes mechanically strong above pH 5.5 and becomes unstable above pH 7 leading to subsequent disintegration. The characterization of hydrogel was carried by FTIR, FESEM and TGA analysis. In addition, the hydrogel was reduced using NaBH4 for drug release. The reduced gel appears to be stable at lower pH values also. The reduced hydrogel may potentially be used for drug release purpose with low toxicity.

Continuous removal of pharmaceutical drug chloroquine and Safranin-O dye from water using agar-graphene oxide hydrogel: Selective adsorption in batch and fixed-bed experiments

In this work, Chloroquine diphosphate, and the cationic dye Safranin-O were selectively removed from water using the agar-graphene oxide (A-GO) hydrogel, produced via simple one-step jellification process. The morphology of the A-GO biocomposite was characterized and batch experiments were performed, with adsorption isotherms satisfactorily fitting (R2 > 0.98) Sips (Safranin-O) and Freundlich (Chloroquine) isotherms. Driving force models and Fick's diffusion equation were applied to the modeling of kinetic data, and a satisfactory fit was obtained. Selective adsorption carried out in batch indicated that competitive adsorption occurs when both components are mixed in water solution - the adsorptive capacities dropped ∼10 mg g−1 for each component, remaining 41 mg g−1 for safranin-O and 31 mg g−1 for chloroquine. Fixed-bed breakthrough curves obtained in an adsorption column showed adsorption capacities over 63 mg g−1 and 100 mg g−1 for chloroquine and safranin-O, respectively, also exhibiting outstanding regenerative potentials. Overall, the biocomposite produced using graphene oxide proved to be a viable and eco-friendly alternative to continuously remove both contaminants from water.

RETRACTED ARTICLE: Polydopamine-modified MWCNT/graphene oxide hybrid 3D carbon nano-structure for flexible symmetric supercapacitor electrodes

The nanocarbon-based three-dimensional carbon nano-structure was prepared from the combination of one-dimensional multi-walled carbon nanotubes (MWCNTs) and two-dimensional graphene oxide by a simple hydrothermal method. The MWCNT/graphene hybrid hydrogel (CGOH) was used as electrode, and it exhibited higher specific capacitance (193.3 F g−1) compared to graphene oxide hydrogel (62.5 F g−1) due to the increase of electrical conductivity. Further enhancement of the capacitance was studied in this work by utilizing polydopamine (PDA) coating on the CGOH surface and heat treatment at 600 °C under argon gas condition for 2 h (PDA-CGOH-600). The specific capacitance of the PDA-CGOH-600 (217.4 F g−1) was enhanced by 12.5% compared to the CGOH. Using these hybrids, the flexible symmetric supercapacitor (FSS) devices were prepared with a solid polymer electrolyte (polyvinyl alcohol/sulfuric acid). The charge/discharge tests of FSS device confirmed that the highest capacitance of the FSS based on PDA-CGOH-600 because of the nitrogen-doping effect and the graphitic carbon formation. Furthermore, FSS device can be applied in the wire-shaped supercapacitor and good parameters of the energy storage device were achieved, such as specific capacitance of 50 mF cm−2, stability during 3000 times of charge/discharge, as well as stretchability and bending ability.

Evaluation of the Adsorption Efficiency of Graphene Oxide Hydrogels in Wastewater Dye Removal: Application of Principal Component Analysis.

Industrial dye wastewater is one of the major water pollution problems. Adsorbent materials are promising strategies for the removal of water dye contaminants. Herein, we provide a statistical and artificial intelligence study to evaluate the adsorption efficiency of graphene oxide-based hydrogels in wastewater dye removal by applying Principal Component Analysis (PCA). This study aims to assess the adsorption quality of 35 different hydrogels. We adopted different approaches and showed the pros and cons of each one of them. PCA showed that alginate graphene oxide-based hydrogel (without polyvinyl alcohol) had better tolerance in a basic medium and provided higher adsorption capacity. Polyvinyl alcohol sulfonated graphene oxide-based hydrogels are suitable when higher adsorbent doses are required. In conclusion, PCA represents a robust way to delineate factors affecting hydrogel selection for pollutant removal from aqueous solutions.

Graphene oxide hydrogel electrolyte for improving the performance of electropolymerized polyaniline solar cells

In this proof-of-concept study, we reported the incorporation of a graphene oxide hydrogel (GO-gel) electrolyte as the cathode and the electropolymerized aniline (E-PANI) in situ on a titanium oxide (TiO2)-coated fluorine-doped tin oxide (FTO) as the anode in an organic solar cell (OSC) for the first time, to the best of our knowledge. Fourier-transform infrared (FT-IR) microscopy, scanning electron microscopy (SEM), atomic force microscopy (AFM), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS) were applied for characterization studies. The incorporation of GO-gel electrolyte within E-PANI significantly enhanced the power conversion efficiency (PCE) by 257.0% compared to the standard E-PANI solar cell with a liquid electrolyte. Under an AM 1.5 G (100 mW/cm2) illumination, the final OSC (FTO│TiO2/E-PANI/GO-gel-I-/I3−│Al) demonstrated an overall PCE of 4.35% with an open circuit voltage (Voc) of 0.889 V and a short circuit current density (Jsc) of 15.13 mA/cm2. The photovoltaic properties were found to be superior to those of the previously reported E-PANI-based solar cells. Our preliminary results showed that the rheological properties, PCE and stability were significantly enhanced with the incorporation of GO-gel electrolyte. Thus, GO-gel electrolytes provide a promising platform for the development of high-efficiency photovoltaic devices in the near future.

Shear-thinning and self-healing chitosan-graphene oxide hydrogel for hemostasis and wound healing

Hydrogels with injectability, self-healing ability and adhesiveness have great potential for hemostasis and full-thickness skin wound repair, which are usually fabricated by multistep chemical synthesis and the use of organic solvents and catalyst. Herein, we report an injectable and self-healing hydrogel facilely prepared through one-pot heating of chitosan and graphene oxide mixture solution, without any pollutant and waste generated. The dynamic reversible breakage and recombination of noncovalent bonds between chitosan and graphene oxide endows the hydrogel injectability and self-healing ability. In addition, the mechanical and rheological properties of the hydrogels can be controlled by varying the dosage of graphene oxide. Meanwhile, hydrogels exhibited good adhesiveness and hemocompatibility. Finally, in vivo experiments in a rat liver bleeding model and full-thickness skin defect model verified the outstanding hemostatic and wound healing capability of the hydrogels, indicating the promising future for use as wound dressing.

Synthesis and characterization NS-reduced graphene oxide hydrogel and its electrochemical properties

Developing materials with good electrochemical performance is critical in energy storage applications. One of the promising materials for these applications is reduced graphene oxide (rGO) based materials. Utilizing thiourea as a nitrogen (N) and sulfur (S) source, we present a simple hydrothermal approach for simultaneous doping of nitrogen and sulfur into the rGO hydrogel structure. The visual photograph shows the hydrogel form of the sample. XRD and Raman analysis shows the carbon structural changes during the reduction process. The presence of N and S atoms which spread evenly on the hydrogel structure, was confirmed by energy-dispersive x-ray (EDX) mapping. A cyclic voltammetry measurement at a current density of 0.5 A / g reveals that the NS-rGOH sample has a high specific capacity of 750 C / g. Even at a current density of 10 A / g, it can maintain outstanding charge-discharge stability, with 83.3 % of the initial capacity preserved after 1000 charge-discharge cycles. Moreover, EIS analysis reveals that the low charge transfer resistance and high ionic diffusivity of the rGO hydrogel sample lead to good electrochemical performance. NS doping into the rGOH structure improves the sample's electrochemical performance compared to the undoped sample.

The effect of 3D structure preparation method on lipase/3DMGO biocatalytic parameters and catalytic performance in transesterification of microalgae bio-oil

Nano-biocatalysts, based on Rhizopus oryzae lipase (ROL) immobilized on 3D superparamagnetic graphene oxide (3DMGO) were prepared in two methods and used for the conversion of Chlorella vulgaris oil to biodiesel. The 3D graphene oxide hydrogel was synthetized using two different cross-linking agents, p-phenylene diamine (PPD) and ethylene diamine tetra acetic acid (EDTA), and then magnetized by insitu co-participation of Fe3O4. A modified BG-11 medium was used for cultivation of this microalgae to increase the total biomass lipid (up to 35 wt%). The kinetics parameters, enzyme loading percentage, thermal stability, and storage stability of ROL, ROL/3DMGO-EDTA, and ROL/3DMGO-PPD were evaluated. The biodiesel production yields in the presence of ROL, ROL/3DMGO-PPD, and ROL/3DMGO-EDTA were 75.04%, 74.25%, and 72.12%, respectively. The reusability tests confirmed that the ROL/3DMGO-EDTA had better performance. Therefore, 3D graphene oxide nanostructures can be introduced as a suitable option for enzyme immobilization in the biodiesel production from microalgae oil.

Green starch/graphene oxide hydrogel nanocomposites for sustained release applications

Green nanocomposite hydrogels (ST-PHEMA/GO) comprised of starch and 2-Hydroxyethyl methacrylate (HEMA) reinforced with different ratios of graphene oxide (GO) were prepared via gamma radiation induced crosslinking polymerization. The chemical structure and morphology and the crystallinity were studied by FTIR FE-SEM, AFM, TEM and XRD, respectively. The swelling behavior of the claimed hydrogels was verified versus time and the pH-dependent swelling at three different irradiation dose:10, 20 and 30 kGy was also investigated. The results of the swelling study showed that the swelling capacity of the hydrogel networks varied with the changes of the pH of the solution, the GO content and the irradiation doses. Moreover, the swelling isotherm of all the prepared hydrogels followed a Fickian diffusion mechanism n < 0.5.Graphical abstract

Dual Action Nitric Oxide and Fluoride Ion-Releasing Hydrogels for Combating Dental Caries.

Demineralization and breakdown of tooth enamel are characterized by a condition called dental caries or tooth decay, which is caused by two main factors: (1) highly acidic food intake without proper oral hygiene and (2) overactive oral bacteria generating acidic metabolic byproducts. Fluoride treatments have been shown to help rebuild the hydroxyapatite structures that make up 98% of enamel but do not tackle the bacterial overload that continues to threaten future demineralization. Herein, we have created a dual-function Pluronic F127-alginate hydrogel with nitric oxide (NO)- and fluoride-releasing capabilities for the two-pronged treatment of dental caries. Analysis of the hydrogels demonstrated porous, shear-thinning behaviors with tunable mechanical properties. Varying the weight percent of the NO donor S-nitrosoglutathione (GSNO) within the hydrogel enabled physiologically actionable NO release over 4 h, with the fabricated gels demonstrating storage stability over 21 days. This NO-releasing capability resulted in a 97.59% reduction of viable Streptococcus mutans in the planktonic state over 4 h and reduced the preformed biofilm mass by 48.8% after 24 h. Delivery of fluoride ions was confirmed by a fluoride-sensitive electrode, with release levels resulting in the significant prevention of demineralization of hydroxyapatite discs after treatment with an acidic demineralization solution. Exposure to human gingival fibroblasts and human osteoblasts showed cytocompatibility of the hydrogel, demonstrating the potential for the successful treatment of dental caries in patients.

High-Energy-Density Asymmetric Supercapacitor Based on Free-Standing Ti3C2TX@NiO-Reduced Graphene Oxide Heterostructured Anode and Defective Reduced Graphene Oxide Hydrogel Cathode.

The rational design of an asymmetric supercapacitor (ASC) with an expanded operating voltage window has been recognized as a promising strategy to maximize the energy density of the device. Nevertheless, it remains challenging to have electrode materials that feature good electrical conductivity and high specific capacitance. Herein, a 3D layered Ti3C2TX@NiO-reduced graphene oxide (RGO) heterostructured hydrogel was successfully synthesized by uniform deposition of NiO nanoflowers onto Ti3C2TX nanosheets, and the heterostructure was assembled into a 3D porous hydrogel through a hydrothermal GO-gelation process at low temperatures. The resultant Ti3C2TX@NiO-RGO heterostructured hydrogel exhibited an ultrahigh specific capacitance of 979 F g-1 at 0.5 A g-1, in comparison to that of Ti3C2TX@NiO (623 F g-1) and Ti3C2TX (112 F g-1). Separately, a defective RGO (DRGO) hydrogel was found to exhibit a drastic increase in specific capacitance, compared to untreated RGO (261 vs 178 F g-1 at 0.5 A g-1), owing to abundant mesopores. These two materials were then used as free-standing anode and cathode to construct an ASC, which displayed a large operating voltage (1.8 V), a high energy density (79.02 Wh kg-1 at 450 W kg-1 and 45.68 Wh kg-1 at 9000 W kg-1), and remarkable cycling stability (retention of 95.6% of the capacitance after 10,000 cycles at 10 A g-1). This work highlights the unique potential of Ti3C2TX-based heterostructured hydrogels as viable electrode materials for ASCs.

Effect of magnesium oxide nanoparticles, hydroxyapatite and hydrogel on regeneration of transverse fracture of distal radius

Study's purpose of this study is to conduct synthesis and evaluate the effect of hydroxyapatite (HA) with hydrogel locally magnesium oxide nanoparticles (MgONPS) locally or intraperitoneally (IP) on the healing of the distal third radial fracture. Concentrations of MgONPs 200μg/ml, dissolved in 1 cc distilled water and the solution stirred by a stirrer for 10 min. HA 0.5 mg in 1ml hydrogel and the solution stirring at the vortex for 15 min. These materials were evaluated in vitro to ensure their suitability with the tissues. Seventy-five healthy adult male rabbits, aged about 1.5- 2 years old with average weighting 1.7- 2.3 Kg. B.W were used. Rabbits were divided into three groups randomly (n=25), group A (HA mixed hydrogel applied locally), group B (HA mixed with hydrogel and MgONPs applied locally) and group C (HA mixed hydrogel applied locally and MgONPs IP). Animals were anesthetized by i.m 40 mg/ kg B.W ketamine hydrochloride and 5mg/ kg B.W xylazine. A 5cm incision had made cranio-medially in the skin of the forelimb (right forelimb) and exposure radius and ulna. The macroscopic evaluation revealed that all groups at 2nd week showed bone reaction in different degrees.

Adsorption of Pb2+ and Cd2+ on reduced graphene oxide hydrogel prepared from natural cryptocrystalline graphite

In this study, graphene hydrogel with small pore size and high specific surface area was prepared from unpurified natural cryptocrystalline graphite and was used to adsorb Pb2+ and Cd2+ from aqueous solution. The adsorption performance of reduced graphene oxide hydrogel under different pH, time, initial metal ion concentration and reuse time was investigated. It was experimentally found that the adsorption capacities of reduced graphene oxide hydrogel for Pb2+ and Cd2+ increased with the increase of pH. The adsorption of Pb2+ and Cd2+ followed the Langmuir monolayer adsorption model and pseudo second-order kinetic model. The maximum adsorption capacities of reduced graphene oxide hydrogel for Pb2+ and Cd2+ can reach 2503.62 mg/g and 1185.27 mg/g, respectively. The adsorption for metal ions can finish in about 5 min because of the existence of electrostatic attractive and cation-π interaction between them. The reduced graphene oxide hydrogel remained above 80% adsorption capacities for both Pb2+ and Cd2+ after 6 adsorption-desorption cycles. These results indicated that the graphene oxide prepared from unpurified natural cryptocrystalline graphite was an effective and stable adsorbent for the treatment of heavy metal ions in aqueous.

Novel preparation of attapulgite-reduced graphene oxide hydrogel composite and its application in flexible solid-state supercapacitors

After graphite oxide assisted the liquid phase shear exfoliation of attapulgite, the good dissociation and dispersion of attapulgite rod crystals are realized. Due to the spatial hindrance effect of attapulgite, which prevents the stacking of RGO sheets, the attapulgite-reduced graphene oxide three-dimensional porous hydrogel with abundant pore structure enables rapid transfer of electrolyte ions and exhibits good electrochemical performance and rate performance. The assembled flexible solid-state supercapacitor has a high operating voltage window and good flexibility and cycle stability. At a current density of 0.1 mA cm−2, it has an area specific capacitance of 127.33 mF cm−2. A series of solid-state supercapacitors can be used as the power supply for LED lights.

Acidic and basic self-assembling peptide and peptide-graphene oxide hydrogels: characterisation and effect on encapsulated nucleus pulposus cells

Extracellular pH can have a profound effect on cell metabolism, gene and protein expression. Nucleus pulposus (NP) cells, for example, under acidic conditions accelerate the production of degradative enzymes and pro-inflammatory cytokines, leading ultimately to intervertebral disc degeneration, a major cause of back pain. Self-assembling peptide hydrogels constitute a well-established class of biomaterials that could be exploited as pH-tunable platform to investigate cell behaviour under normal and non-physiological pH. In this paper we formulated acidic (pH = 4) and basic (pH = 9) hydrogels, from the same octapeptide FEFKFEFK (F8) (F = phenyalanine, E = glutamic acid, K = lysine), to test the effect of non-physiological pH on encapsulated NP cells. Similarly, graphene oxide-containing F8 hydrogels (GO-F8) were formulated as stiffer analogues. Acidic and basic hydrogels showed peculiar morphologies and rheological properties, with all systems able to buffer within 30 minutes of exposure to cell culture media. NP cells seeded in acidic F8 hydrogels showed a more catabolic phenotype compared to basic hydrogels, with increased gene expression of degradative enzymes (MMP-3, ADAMTS-4), neurotrophic factors (NGF and BDNF) and NF-κB p65 phosphorylation. Acidic GO-F8 hydrogels also induced a catabolic response, although milder than basic counterparts and with the highest gene expression of characteristic NP-matrix components, aggrecan and collagen II. In all systems, the cellular response had a peak within 3 days of encapsulation, thereafter decreasing over 7 days, suggesting a ‘transitory’ effect of hydrogel pH on encapsulated cells. This work gives an insight on the effect of pH (and pH buffering) on encapsulated NP cells and offers new designs of low and high pH peptide hydrogels for 3D cell culture studies. Statement of significanceWe have recently shown the potential of graphene oxide - self-assembling peptide hybrid hydrogels for NP cell culture and regeneration. Alongside cell carrier, self-assembling peptide hydrogels actually provide a versatile pH-tunable platform for biological studies. In this work we decided to explore the effect of non-physiological pH (and pH buffering) on encapsulated NP cells. Our approach allows the formulation of both acidic and basic hydrogels, starting from the same peptide sequence. We showed that the initial pH of the scaffold does not affect significantly cell response to encapsulation, but the presence of GO results in lower inflammatory levels and higher NP matrix protein production. This platform could be exploited to study the effect of pH on different cell types whose behaviour can be pH-dependent.

3D MXene-holey graphene hydrogel for supercapacitor with superior energy storage

MXene, a new two-dimensional material, has attracted much attention in the field of energy storage. Assembling it into a three-dimensional structure is an effective way to solve the self-stacking problem. However, the assembly of MXene into a three-dimensional structure inevitably reduces the density of the electrode, resulting in a low volumetric capacitance. Here, three-dimensional MXene-holey reduced graphene oxide hydrogel with hierarchical porous structure was obtained by low-temperature hydrothermal treatment, which was used as superior performance binder-free supercapacitor electrode. In the MXene-holey reduced graphene oxide hydrogel electrode, holey reduced graphene oxide can accelerate ion transport, shorten ion and electron transport pathways, and improve the gravimetric capacitance as well as the volumetric capacitance of the electrode. When MX-HGH is applied to the electrode of supercapacitor, it can release gravimetric capacitance up to 415 F g−1 and volumetric capacitance of 597 F cm−3. This work demonstrates a practical method to construct three-dimensional MXene structures with high gravimetric capacitance and relatively high volumetric capacitance, opening up a fresh idea for the application of MXene three-dimensional structures in supercapacitors.

Antifouling performance of in situ synthesized chitosan-zinc oxide hydrogel film against alga M. aeruginosa

The undesirable settlement and growth of microalgae on submerged installations is a universal problem in water environment. Soft hydrogels are promising fouling-resistant materials due to the inherent surface properties. Herein, a kind of chitosan hydrogels with increasing zinc oxide (ZnO) mineral phase content were prepared by in situ sol–gel and solvent casting method, to prevent growth of algae Microcystis. aeruginosa. Incorporation with ZnO mineral phase improved mechanical property, water absorption, and stability of the obtained chitosan-zinc oxide (CS@ZnO) hydrogel films in Zn dose-dependent manner. The highest strength and growth inhibition (63.45 ± 8.93%) were observed by CS@ZnO-1.5 hydrogel films with the concentrations of 1.5% precursor in comparison with other hydrogel films. During this process, algal cell membrane was slightly damaged (24.5 ± 1.57%) and accompanied by significantly synthesis inhibition such as chlorophyll a (55.22 ± 2.72%) and total soluble protein (42.97 ± 1.66%). To sum up, synthesis inhibition of algal cell is the main mechanism of CS@ZnO hydrogel films inhibiting algal growth, which has the potential in antibiofouling application.

Development of Magnetite/Graphene Oxide Hydrogels from Agricultural Wastes for Water Treatment

A novel magnetic hydrogel loaded with graphene oxide (GO) was developed in this study. Firstly, GO was prepared from bagasse through a single step via oxidation in the presence of ferrocene under muffled atmospheric conditions, followed by the loading of different amounts of magnetite onto GO via co-precipitation reaction of iron onto GO sheets. Finally, the 2-acrylamido-2-methyl-1-propane sulfonic acid was grafted onto carboxymethyl cellulose in the presence of magnetite GO and N, N′-methylenebisacrylamide as crosslinker yielded hydrogel. The structure, morphological, and thermal behavior of the prepared hydrogels were investigated. In addition, the adsorption performance of Ni(II) ions from aqueous media by the prepared hydrogels was investigated as a function of temperature, time, and concentration of adsorbate in a batch system. The results demonstrated a remarkable enhancement in the adsorption process of Ni(II) (Removal efficiency = 98.82%). All isotherms were found to fit the Langmuir model best. The adsorption properties of both magnetic GO and magnetic hydrogel showed promising properties as green and cheap adsorbents.