Preparation Of Nanocomposites Research Articles

A Novel Green Preparation of Ag/RGO Nanocomposites with Highly Effective Anticancer Performance.

The efficacy of current cancer therapies is limited due to several factors, including drug resistance and non-specific toxic effects. Due to their tuneable properties, silver nanoparticles (Ag NPs) and graphene derivative-based nanomaterials are now providing new hope to treat cancer with minimum side effects. Here, we report a simple, inexpensive, and eco-friendly protocol for the preparation of silver-reduced graphene oxide nanocomposites (Ag/RGO NCs) using orange peel extract. This work was planned to curtail the use of toxic chemicals, and improve the anticancer performance and cytocompatibility of Ag/RGO NCs. Aqueous extract of orange peels is abundant in phytochemicals that act as reducing and stabilizing agents for the green synthesis of Ag NPs and Ag/RGO NCs from silver nitrate and graphene oxide (GO). Moreover, the flavonoid present in orange peel is a potent anticancer agent. Green-prepared Ag NPs and Ag/RGO NCs were characterized by UV-visible spectrophotometry, transmission electron microscopy (TEM), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and dynamic light scattering (DLS). The results of the anticancer study demonstrated that the killing potential of Ag/RGO NCs against human breast cancer (MCF7) and lung cancer (A549) cells was two-fold that of pure Ag NPs. Moreover, the cytocompatibility of Ag/RGO NCs in human normal breast epithelial (MCF10A) cells and normal lung fibroblasts (IMR90) was higher than that of pure Ag NPs. This mechanistic study indicated that Ag/RGO NCs induce toxicity in cancer cells through pro-oxidant reactive oxygen species generation and antioxidant glutathione depletion and provided a novel green synthesis of Ag/RGO NCs with highly effective anticancer performance and better cytocompatibility.

Durability of Biodegradable Polymer Nanocomposites.

Biodegradable polymers (BP) are often regarded as the materials of the future, which address the rising environmental concerns. The advancement of biorefineries and sustainable technologies has yielded various BP with excellent properties comparable to commodity plastics. Water resistance, high dimensional stability, processability and excellent physicochemical properties limit the reviewed materials to biodegradable polyesters and modified compositions of starch and cellulose, both known for their abundance and relatively low price. The addition of different nanofillers and preparation of polymer nanocomposites can effectively improve BP with controlled functional properties and change the rate of degradation. The lack of data on the durability of biodegradable polymer nanocomposites (BPN) has been the motivation for the current review that summarizes recent literature data on environmental ageing of BPN and the role of nanofillers, their basic engineering properties and potential applications. Various durability tests discussed thermal ageing, photo-oxidative ageing, water absorption, hygrothermal ageing and creep testing. It was discussed that incorporating nanofillers into BP could attenuate the loss of mechanical properties and improve durability. Although, in the case of poor dispersion, the addition of the nanofillers can lead to even faster degradation, depending on the structural integrity and the state of interfacial adhesion. Selected models that describe the durability performance of BPN were considered in the review. These can be applied as a practical tool to design BPN with tailored property degradationand durability.

A review on polymer nanocomposite hydrogel preparation, characterization, and applications

Nanocomposite hydrogels, made by incorporating nanoparticles into a hydrogel matrix, have been developed to fulfill the need for materials with enhanced and predictable mechanical properties and functionality. This review breaks down the process of preparing and characterizing nanocomposite hydrogels and looks at the various applications they can be used for. Through careful selection of the nanoparticle and hydrogel types, as well as the preparation method, the degree of crosslinking and the strength of the intermolecular interactions between the nanoparticles and the hydrogel matrix can be controlled. Once the nanomaterial is prepared, the morphology, gel content, thermal stability, and mechanical properties are investigated. By varying the concentrations of nanoparticles within the hydrogel matrix, nanocomposite hydrogels with optimal functionality and mechanical properties are produced. The optimized nanomaterial can then be used for its intended application(s); here the focus is on applications in the biomedical and dye adsorption fields. With further research, it is predicted that nanocomposite hydrogels will fulfill their potential to be used in practical, everyday applications.

Preparation and studying the electrical characteristics of (PS-PMMA-BaTiO3) nanocomposites for piezoelectric applications

The preparation of (PS-PMMA-BaTiO3) nanocomposites for piezoelectric applications has been investigated. Barium titanate nanoparticles were added to a polymer blend of (PS-PMMA) at various concentrations (3, 6, 9 and 12) weight percent. We investigated structural, and ac electrical characteristics of (PS-PMMA-BaTiO3) nanocomposites. Results indicate as frequency of the (PS-PMMA-BaTiO3) nanocomposites increases, dielectric constant & dielectric loss decreases. Conductivity of ac current increase with frequency. At increasing BaTiO3 NPs concentration, dielectric constant, dielectric loss & ac conductivity for (PS-PMMA) polymer blend increases. Application of piezoelectric demonstrated decreasing (PS-PMMA-BaTiO3) nanocomposites resistance as increasing the pressure.

Facile one pot preparation of magnetic chitosan-palygorskite nanocomposite for efficient removal of lead from water

Development of polymeric magnetic adsorbents is a promising approach to obtain efficient treatment of contaminated water. However, the synthesis of magnetic composites involving multiple components frequently involves tedious preparation steps. In the present study, a magnetic chitosan-palygorskite (MCP) nanocomposite was prepared through a straight-forward one pot synthesis approach to evaluate its lead (Pb2+) removal capacity from aqueous solution. The nano-architectural and physicochemical properties of the newly-developed MCP composite were described via micro- and nano-morphological analyses, and crystallinity, surface porosity and magnetic susceptibility measurements. The MCP nanocomposite was capable to remove up to 58.5 mg Pb2+ g−1 of MCP from water with a good agreement of experimental data to the Langmuir isotherm model (R2 = 0.98). The Pb2+ adsorption process on MCP was a multistep diffusion-controlled phenomenon evidenced by the well-fitting of kinetic adsorption data to the intra-particle diffusion model (R2 = 0.96). Thermodynamic analysis suggested that the adsorption process at low Pb2+ concentration was controlled by chemisorption, whereas that at high Pb2+ concentration was dominated by physical adsorption. X-ray photoelectron and Fourier transform infrared spectroscopy results suggested that the Pb adsorption on MCP was governed by surface complexation and chemical reduction mechanisms. During regeneration, the MCP retained 82% Pb2+ adsorption capacity following four adsorption–desorption cycles with ease to recover the adsorbent using its strong magnetic property. These findings highlight the enhanced structural properties of the easily-prepared nanocomposite which holds outstanding potential to be used as an inexpensive and green adsorbent for remediating Pb2+ contaminated water.

Single-Step Preparation of Ultrasmall Iron Oxide-Embedded Carbon Nanotubes on Carbon Cloth with Excellent Superhydrophilicity and Enhanced Supercapacitor Performance.

Nanocomposites consisting of carbon materials and metal oxides are generally preferred as anodes in electrochemical energy storage. However, their low capacitance limits the achieved energy density of supercapacitors (SCs) in aqueous electrolytes. Herein, we propose a rapid combustion strategy to construct a novel electrode architecture-ultrasmall Fe2O3 anchoring on carbon nanotubes (FeO-CNT)-as a superhydrophilic and flexible anode for SCs. In 1 M Na2SO4 aqueous electrolyte, such an FeO-CNT-20 anode presents a high capacitance of 483.4 mF cm-2 (326 F g-1) at 1 mA cm-2. The aqueous asymmetric supercapacitor devices (ASCs) assembled by FeO-CNT-20 and MnO2 present a maximum operating potential of 2.0 V with a high areal energy density of 0.11 mWh cm-2 at a power density of 0.5 mW cm-2. The flexible solid-state ASCs display an energy density of 0.99 mWh cm-3 at 14.3 mW cm-3. The rapidly prepared FeO-CNT not only offers an attractive electrode for SCs but also would open up exciting new avenues to the rational design and large-scale preparation of Fe2O3-based nanocomposites for electrochemical energy storage.

Synthesis of phosphoric triamide nanostructures, characterization, X-ray crystallography, and preparation of P2O5-RGO nanocomposites by solvothermal method

Rod-shaped and hexagon-like nanostructures of a phosphoric triamide 4-NO2C6H4C(O)NHP(O)(NHC(CH3)3)2 have been prepared by a sonochemical method and a microwave process, respectively. The new nano-structures were characterized by SEM, XRD, UV–vis, infrared spectroscopy, and elemental analyses. The crystal structure of compound showed a distorted tetrahedral geometry for phosphorus with anti-configuration for the P(O) and C(O) groups respect to each other. Non-covalent interactions, that is, hydrogen bonding, stacking, and CH…HC contacts connected the chains into a 3D framework. Thermal stability in single crystalline and nano-scale was carried out by TGA and DSC. Further, P2O5 nanosphericals have been prepared from a precursor nano-rod phosphoric triamide at 750 °C with a diameter of 30–40 nm. P2O5 nanoparticles have been decorated from a single source precursor phosphoramide, 4-NO2C6H4C(O)NHP(O)(NHC(CH3)3)2, onto reduced graphen oxide surfaces by a solvothermal approach. Decorated nanoparticles have an orthorhombic phase with a sphere-like morphology and average size of 10–20 nm.

Utilization of copper sulphide nanoparticles for the development of cashew tree gum/ chitin biopolymer blend nanocomposites

This work focused on the preparation of biopolymer blend nanocomposites from chitin (CT) and cashew tree gum (CTG) with different contents of copper sulphide nanoparticles (CuS) by solution casting method. The formation of nanocomposites have been characterized by FT infrared (FTIR), UV spectroscopy, X-ray diffraction (XRD), scanning electron microscope (SEM), high-resolution transmission electron microscope (HRTEM), thermogravimetry (TGA), differential scanning calorimetry (DSC) and impedance analysis. The characteristic absorption of nanoparticles in the FTIR spectra and shift in UV spectra of blend composites revealed the strong interaction between CuS nanoparticles and the polar segments of CT/CTG blend. With the increase in dosage of nanoparticles, a decrease in amorphous domains has been noted in the XRD scans. The uniform distribution of nanoparticles in CT/CTG network has been confirmed by the SEM analysis. HRTEM of the blend composites reveals the formation of hemispherical nanoparticles with a diameter of 15–30 nm. The glass transition temperature of blend composites increased with the addition of nano-CuS in the polymer matrix. Compared to the pure CT/CTG blend, the prepared nanocomposite showed higher thermal stability. Mechanical properties such as tensile strength and hardness of the blend nanocomposites were greatly enhanced by the reinforcement of CuS into the CT/CTG matrix. The AC conductivity and dielectric properties of the nanocomposites increased with the concentration of fillers and the magnitude of these properties was higher than the pure polymer blend.

Application of a Catechol-Polyamine Co-Deposition method for synthesis of Heteroatom-Doped carbon nanomaterials

Mussel-inspired chemistry, based on dopamine and its derivatives, has attracted widespread attention in the past decade. However, dopamine and its derivatives are expensive and the modification process requires a large amount of buffer solution, which greatly hinder their large-scale application. Here, a simple, versatile and cost-effective catechol-polyamine (Cat-amine) co-deposition method, which has excellent conformal coating performance independent of the composition, dimension, and shape of the substrate, has been developed. The co-deposition takes place in water, and the thickness of the resultant conformal Cat-amine polymer coating can be precisely tailored. In addition, due to the elemental composition of the as-prepared Cat-amine coating is adjustable, N doped or N, S co-doped carbon frameworks with various shapes can be easily prepared. As representative examples, yolk-shell structured nanospheres with nickel silicate inside the hollow N doped carbon nanospheres have been prepared. The composite nanospheres exhibit excellent cycle stability and superior rate capability when evaluated as anode materials for lithium-ion batteries. This highly reproducible and scalable approach provides new ideas for the large-scale preparation of advanced carbon nanocomposites.

One step synthesis approach of mesoporous silica packed with graphene oxide nanosheet: Characterisation and drug release aspects

ABSTRACT The motive of the present investigation was to establish a novel, hybrid multifunctional lipid-coated graphene oxide mesoporous silica nanocomposite (GO-MSN) for controlled delivery of Rizatriptan Benzoate (RiB). The lipid coating helps to achieve a longer circulation time of the fabricated carrier for targeted delivery of RiB. The modified Hummers method with slight modification gives a uniform sheet of GO, subsequently sol-gel approach use to synthesized mesoporous silica for the preparation of nanocomposite. The in-vitro RiB release from RiB-GO-MSN and lipid decorated GO-MSN was found to be 70.74% and 63.45% respectively. The lipid coating retards the release of RiB around 8 h. The entrapment efficiency of RiB-MSN and GO-MSN were found to be 48.17% and 62.29% respectively. In the presence of GO, RiB entrapment increases as RiB may entrap within inter and intra spacing of GO. The present investigation oversee, simple methodology adopted for synthesis of GO-MSN can effectively deliver RiB towards brain for the management of migraine.

Preparation of nanocomposites of PbS quantum dots dispersed in MAPbI3 matrix from precursor solution of Pb xanthate

Organic-inorganic hybrid perovskites attract attentions because of their unique electro-optical properties which are expected to be applied to various devices. The perovskite compounds are generally prepared from precursor solutions consisting of two materials, AX and BX2 for ABX3. Generally, methylammonium lead triiodide (MAPbI3) perovskite is formed from the precursor solution consisting of methylammonium iodide (MAI) and lead iodide (PbI2). In this report, we select Pb(-S-C(S)-OR)2 (lead xanthate, abbreviated as Pb(XT)2) as the perovskite precursor instead of PbI2. We found that the precursor solutions consisting of the MAI and the Pb(XT)2 give nanocomposites consisting of MAPbI3 and PbS nanomaterials including PbS quantum dot without changing the MAPbI3 bandgap. In this report, nanocomposites prepared from precursors consisting of Pb(XT)2/MAI with various ratios are analysed by using XRD, XPS, TG-DTA, TEM and UV/VIS spectroscopy.

Preparation of graphene-supported Co-CeOx nanocomposites as a catalyst for the hydrolytic dehydrogenation of ammonia borane

Low-cost and high-performance catalyst is crucial for hydrogen generation via the hydrolysis of ammonia borane (NH3BH3, AB) as a chemical hydrogen storage material. In this work, Co-CeOx nanocomposites supported on graphene (Co-CeOx/graphene) were prepared through a facile impregnation and chemical reduction method and used as a catalyst in the hydrolytic dehydrogenation of ammonia borane. The results indicate that the as-prepared Co-CeOx/graphene nanocomposite exhibits superior catalytic activity and recycling stability in the hydrolysis of ammonia borane, owing to the ultra-fine size of Co-CeOx particles, the strong synergistic electronic effect between Co and CeOx, as well as the strong metal-support interaction between Co-CeOx and graphene. For the hydrolysis of ammonia borane over the optimized Co-CeOx/graphene catalyst, the turnover frequency (TOF) reaches 45.1 min−1, with the activation energy (Ea) of 39.5 kJ/mol; such a TOF value is 12 times and 9 times higher than those over Co and Co/graphene, respectively, also much higher than those reported for most noble-metal-free catalysts.

Preparation of Let-7b Nanocomposite and Its Effect on the Level of Inflammatory Factors in Cerebrospinal Fluid of Purulent Meningitis

This study was to explore the effect and mechanism of Let-7b nanocomposite on the expression of inflammatory factors in the cerebrospinal fluid (CSF) of purulent meningitis. 45 patients with purulent meningitis (PM) were selected as observation group (group A), and 38 patients with normal CSF without central nervous system diseases were selected as the control group (group B). The CSF of the two groups were collected to detect the inflammatory factors interleukin-8 (IL-8), macrophage inflammatory protein-1α (MIP-1α), matrix metalloproteinase 9 (MMP9), interleukin 1β (IL-1β), tumor necrosis factor-α (TNF-α), and Let-7b level with the double antibody sandwich enzyme-linked immunosorbent assay (ELISA). The Let-7b nanocomposite was prepared, and its morphology, particle size, and Zeta potential were analyzed. In addition, the degradation kinetics, cytotoxicity, and phagocytic efficiency (PE) of Let-7b nanocapsules were detected. 36 healthy adult New Zealand (NZL) rabbits were randomly grouped into a control group (group C) (0.9% normal saline (NS)), a model group (Escherichia coli (E. coli) modeling, group D), and a test group (E. coli modeling + Let-7b nanocapsules, group E), with 12 rabbits in each group. The changes of inflammatory factors in CSF of the three groups were detected and compared. It was found that the expression levels of IL-8 and IL-1 β in the group A were much higher than those in the group B (P < 0.01), and the MMP9 and TNF-α levels in the group B were much lower in contrast to the group A (P < 0.001). The expression of Let-7b in the group A was lower obviously in contrast to the group B (P < 0.001). Let-7b nanocapsules were irregularly spherical, with an average particle size (APS) of 23.1 nm, a polydispersity index (PDI) of 0.232, and the Zeta potential of around +15 mV. Let-7b nanocapsules showed obvious polymer shell absorption peaks at 1,015 cm-1, 1,228 cm-1, and 1,547 cm-1. The IL-8 and IL-1β levels of the group D were greatly different from those in the other two groups (P < 0.01). The levels of TNF-α and MMP9 in the group D were greatly different in contrast to the group C (P < 0.001) and the group E (P < 0.01). It indicated that Let-7b nanocomposite could lower the expression levels of IL-8, IL-1β, MMP9, and TNF-α in the CSF of patients with purulent meningitis dramatically, which provides a reliable basis for immunotherapy of purulent meningitis with Let-7b.

Preparation, Characterization and Antibacterial activity of polyaniline-CdS nanocomposites

Polyaniline (PANI) semiconductor polymer and cadmium sulfide nanoparticles (CdS NPs) was prepared by chemical oxidation method and sol-gel method respectively. (10-40) wt% content of CdS NPs was added polyaniline conductive polymer powder to prepared PANI-CdS nanocomposites. The Fourier transform infrared analysis FT-IR spectra of the prepared samples revealed that the effective groups and peak locations referred to the confirming chemical bond are well-matched with the reported literature. The XRD results shows a very wide peak of PANi polymer which indicate to some crystallinity of PANi structure. Whereas the diffraction pattern of CdS NPs shows high crystallinity and polycrystalline nature of hexagonal wurtzite phase. The diffraction pattern of PANI-CdS nanocomposites shows lower peaks intensity than of CdS NPs and improved with the increase of CdS NPs content. The antibacterial activity of PANi and PANi-CdS nanocomposites was estimated by agar well diffusion method against four types of pathogenic bacteria Proteus mirabilis, Staphylococcus aureus, Escherichia coli and Klebsiella pneumonia. It was found that there is a strong antibacterial activity and the greatest effect was for the prepared PANi-CdS NPs 40 wt% and the highest activity was found against Staph. aureus bacteria as well as with the increase of nanoparticles content.

Preparation and Characterization of Wood-Plastic Nanocomposites Based on Acrylonitrile-Butadiene-Styrene.

The new wood-plastic nanocomposites (WPC) based on acrylonitrile-butadiene-styrene (ABS) resin was successfully blended with ABS and poplar flour (PF) through a HAAKE rheomix. The mechanical properties of nanocomposites, except for flexural modulus, were reduced after increasing the PF content. SEM photos show the reduction resulting from weak interfacial adhesion between the PF phase and ABS phase. Higher PF content leads to a low thermal stability and a high water absorption ratio. Different coupling agents (CA) were employed to improve the compatibility between PF and ABS. The results suggest that ABS-g-MAH is more effective than POE-g-MAH, EVA and SEBS. Maleic anhydride (MA) was blended in situ with PF and ABS as the reactive compatibilizer and mechanical properties of nanocomposites were improved except impact strength.

TiO2/reduced hydroxylated graphene nanocomposite photocatalysts: Improved electron–hole separation and migration

In the catalytic process of semiconductor, the rapid recombination of electron-holes greatly reduces the catalytic activity of the semiconductor catalyst. In this study, a low-defect reduced hydroxylated graphene (RGOH) was used as a carrier material to prepare TiO 2 /reduced hydroxylated graphene (T/RGOH) nanocomposite photocatalyst by one-step hydrothermal method. The nanocomposite photocatalysts were used to degrade methylene blue (MB). The degradation efficiency of MB catalyzed by T/RGOH nanocomposite photocatalyst was about 48.5% higher than that of the pure TiO 2 , and about 19.7% higher than that of the TiO 2 /reduced graphene oxide (T/RGO) nanocomposite photocatalyst. This was because the electrical conductivity of RGOH was much higher than that of RGO, which greatly improved the separation and migration efficiency of photogenerated electron-holes. At the same time, there might exist the Ti– O –C bond in the T/RGOH, which was advantageous to transfer photogenerated electrons through this bond to the RGOH flakes and prevented rapid recombination of photogenerated electron-holes. This study indicated that the preparation of catalyst nanocomposites using RGOH as carrier was an effective method to improve the catalytic performance of semiconductor catalysts. • The low-defect reduced hydroxylated graphene, whose conductivity was about 1000 times that of reduced graphene oxide. • The degradation efficiency of T/RGOH nanocomposite photocatalyst for MB is about 48.5% higher than that of pure TiO 2 . • The degradation efficiency of T/RGOH nanocomposite photocatalyst for MB is about 19.7% higher than that of pure T/RGO.

Thermal Stability and Decomposition Mechanism of PLA Nanocomposites with Kraft Lignin and Tannin.

Packaging applications cover approximately 40% of the total plastics production, whereas food packaging possesses a high proportion within this context. Due to several environmental concerns, petroleum-based polymers have been shifted to their biobased counterparts. Poly(lactic acid) (PLA) has been proved the most dynamic biobased candidate as a substitute of the conventional polymers. Despite its numerous merits, PLA exhibits some limitations, and thus reinforcing agents are commonly investigated as fillers to ameliorate several characteristics. In the present study, two series of PLA-based nanocomposites filled with biobased kraft-lignin (KL) and tannin (T) in different contents were prepared. A melt–extrusion method was pursued for nanocomposites preparation. The thermal stability of the prepared nanocomposites was examined by Thermogravimetric Analysis, while thermal degradation kinetics was applied to deepen this process. Pyrolysis–Gas Chromatography/Mass Spectrometry was employed to provide more details of the degradation process of PLA filled with the two polyphenolic fillers. It was found that the PLA/lignin nanocomposites show better thermostability than neat PLA, while tannin filler has a small catalytic effect that can reduce the thermal stability of PLA. The calculated Eα value of PLA-T nanocomposite was lower than that of PLA-KL resulting in a substantially higher decomposition rate constant, which accelerate the thermal degradation.

Binary Mixtures of Colloidal Cellulose Nanocrystals and Laponite for Preparation of Functional Nanocomposites

Binary Mixtures of Colloidal Cellulose Nanocrystals and Laponite for Preparation of Functional Nanocomposites

Synergistic Effects of Thermal and Near-Infrared Radiation Heating on the Self-Healing Effect of Shape Memory Polyethylene Elastomer Nanocomposites

The preparation of commodity polymers that can undergo self-healing of scratched surfaces is still quite challenging without involving complicated synthetic processes and high cost of healing agents. In the research described here, we prepared a self-healing acrylic acid-functionalized metallocene polyethylene elastomer (mPE-g-AA) nanocomposite with the addition of arginine to form supramolecular hydrogen bonding. Thermal characterization, mechanical properties, shape memory effect, and self-healing properties were investigated. The addition of mutilwall carbon nanotubes (MWCNTs) effectively increased the tensile properties of the modified mPE. The acrylic acid-modified mPE greatly improved its shape recovery ratio, up to 94.2 ± 4.7%, and maintained a high shape fixing ratio (91.6 ± 1.3%) due to the hydrogen bonding acting as physical crosslinks. Overall, all modified mPE samples showed good shape memory performance. Besides the conventional thermal heating to heal the scratched surface cracks, MWCNTs were incorporated to permit healing the surface cracks through near-infrared radiation (NIR). However, the MWCNTs-filled samples under the thermal healing process unexpectedly resulted in the crack widths increasing, perhaps due to the effect of the MWCNTs with high recovery stress pushing outward on both sides of the crack during heating. Interestingly, the synergistic approach of combining thermal healing and NIR was found to be the most effective in improving the healing efficiency of the mPE-g-AA-Arg/MWCNTs, close to 50% within a short time, in comparison with the existing literature with required healing times of 60 min to have a self-healing efficiency of 45% for mPE modified with maleic anhydride and 3-amino-1,2,4-triazole. To the best of the authors’ knowledge, no work has been reported on the preparation of self-healing thermoplastic elastomer nanocomposites through this approach so far.

Preparation of graphene quantum dots-doped TiO2 nanocomposites via a sol-gel method for photocathodic protection

Titanium dioxide (TiO2) is a promising semiconductor for photocathodic protection, but the low efficiency of visible-light absorption and quantum restricts its application. In this study, graphene quantum dots-doped TiO2 (TiO2-GQD) nanocomposites with mesopores were prepared by a sol-gel method under ultrasonic radiation conditions. The prepared TiO2-GQD nanocomposites exhibit excellent performance in the aspects of sunlight absorption, and photocathodic protection. It can protect the active metal and reduce the corrosion rate effectively. It is expected the TiO2-GQD nanocomposites will be used in marine engineering to realize the efficient and sustainable development of marine corrosion protection.