UV Absorption Capacity Research Articles

LLDPE/TiO2 composites with high UV aging resistance and mechanical properties by controlling the alumina coating on TiO2

AbstractFor preparing high performance LLDPE film, the photocatalytic activity and the UV absorption capacity of TiO2 were regulated by the alumina coating content on the surface of TiO2. Alumina‐coated TiO2 was prepared by the chemical liquid deposition method, and characterized by element analysis, TGA, FTIR, and morphology observation. The alumina coating layer had been proven to covalently bind to the surface of TiO2 through AlOTi bonds, which formed a continuous and dense coating layer, followed by forming a loose flocculent coating layer with the increase of alumina content. The alumina coating layer could significantly reduce the formation of carbonyl group on the LLDPE chains, and enhance UV aging resistance of LLDPE by inhibiting the photocatalytic activity of TiO2. Moreover, the dispersion of alumina‐coated TiO2 in the LLDPE matrix was improved. Thus, the transmittance of LLDPE/alumina‐coated TiO2 composites was reduced and the whiteness was improved. Importantly, the continuous and dense alumina coating layer was enough to inhibit the photocatalysis effect of TiO2 on LLDPE. The further increase of alumina coating content reduced the UV absorption capacity of alumina‐coated TiO2 and its compatibility with the LLDPE matrix. Therefore, the best alumina coating content on the surface of TiO2 was 1.46 wt% for preparing high performance LLDPE/TiO2 composites.Highlights Alumina‐coated TiO2 with controllable coating thickness was successfully synthesized. LLDPE/alumina‐coated TiO2 has excellent UV aging resistance and mechanical properties. The photocatalytic activity and UV absorption capacity of TiO2 could be regulated. 1.46 wt% of alumina coating is the best content for high performance LLDPE/TiO2 composites.

The polytannic acid‐Fe(III) functionalized graphene oxide in poly (propylene carbonate) nanocomposite enabling enhanced shape memory, UV‐resistance, and self‐healing performance

AbstractPolypropylene carbonate (PPC) is a promising candidate of substrate materials used for human wearable devices due to its excellent ductility and biocompatibility. However, PPC is prone to be deformed, thus resulting in poor shape recovery property. One effective solution is to construct composites. In this work, poly (tannic acid) with Fe3+ (FPTA) @ graphene oxide (GO) was added to fabricate FPTA@GO/PPC composites. The results show that FPTA@GO can construct a tight network of hydrogen bonds into PPC to improve shape memory and self‐healing properties. By varying the FPTA@GO content, the composites exhibit tunable shape memory property. Dynamic mechanical analysis confirms that FPTA@GO/PPC composites show better shape memory properties compared with pure PPC. 5 wt% FPTA@GO/PPC composite demonstrates superior shape fixation ratio (Rf = 99%) as well as superior shape recovery ratio (Rr = 94%) in 37°C. Moreover, 5 wt% FPTA@GO/PPC composite possesses great self‐healing efficiency of 81% and tensile strength (17.2 MPa). The UV absorption capacity of 5 wt% FPTA@GO/PPC is increased by 150% (far and mid‐UV regions) and 400% (near‐UV region) compared with pure PPC. Thus, FPTA@GO/PPC composites have potential applications in developing shape memory, self‐healing, and UV‐resistant materials for human wearable devices.

UV-absorption Capacity of Selected Crude and Functionalized Lignin for Use in Sunscreens

The most commonly used commercial sunscreen agents are aromatic compounds oxybenzone and octinoxate, as they offer a wide range of protection in the UV spectrum. However, oxybenzone has the highest rate of skin irritation, while octinoxate has poor photostability. Oxybenzone is also a genotoxicant and skeletal endocrine disruptor to corals. Appropriate, less toxic and preferentially biorenewable alternatives should be recommended. Lignin, an abundant byproduct of pulp and biorefinery industries, is expected to be an effective replacement for oxybenzone and octinoxate due to its aromatic structure, which, in synergy with a wide variety of functional groups, produces the absorption of energy in the entire UV region. Additionally, lignin is a biocompatible polyphenolic with a strong radical quenching ability, i.e., anti-oxidizing potential. Therefore, it is a promising replacement for synthetic chemicals in cosmetics, sunscreen, and other applications. The UV absorption analysis of selected crude and functionalized lignin samples was conducted, and the results were compared to those of commercially used UV-absorption agents—oxybenzone and octinoxate. The results showed that the total absorption capacity of the lignin samples is lower by 6.4x and 16.3x compared to oxybenzone and octinoxate, respectively; however, it covers a wide absorption range in the UV spectrum. The lignin samples also showed good photostability and color stability, in contrast to the observed yellowing of octinoxate after 3 hours of exposure to sunlight. The UV spectra of some of the lignin samples indicate that their UV absorption capacity was enhanced by as much as 13.31% after exposure to sunlight.

First-principles investigations on the physical properties of the double perovskite Cs2OsI6

The double perovskites, as a novel material with promising applications in solar cells, have garnered significant research interest. The mechanical, electrical, optical, and thermodynamic characteristics of Cs2OsI6 are systematically studied using first-principles calculations. The material's mechanical stability satisfies the Born criteria, and it exhibits commendable elasticity and anisotropy. The application of the HSE06 hybrid functional reveals that Cs2OsI6 has a direct band gap of 1.14 eV at the Γ-point, with electronic states primarily originating from the I-p orbitals and Os-d orbitals. The optical properties, including the dielectric function, refractive index, and absorption coefficient, indicate that it has a strong UV absorption capacity. The thermodynamic properties, including the Debye temperature, heat capacity, enthalpy, entropy, and free energy, conform to the laws of thermodynamics. The results indicate that Cs2OsI6 exhibits good stability with changes in temperature. In addition, it has a suitable band gap and a strong light absorption coefficient, making it suitable for photovoltaic applications. It has great potential to be a candidate for perovskite solar cell materials.

Enhanced ultraviolet aging resistance of epoxy resins through surface enrichment achieved by fluorinated graphene oxide@CeO2

Fluorinated graphene oxide@CeO2 (FGO@CeO2) was synthesized using an in-situ growth method and incorporated as a filler into epoxy resins to improve their UV aging resistance. On UV irradiation, it facilitated the surface enrichment of the modified epoxy resin (MEP), forming a UV-blocking layer. Incorporating FGO@CeO2 induced n→π* electronic transitions within the MEP and lowered the electronic excitation threshold, expanding the UV spectral absorption band and enhancing the UV absorption intensity. A 785% increase in the UV absorption capacity was achieved in the MEP compared with that in the pristine epoxy resin. After 300 h of UV exposure, the photothermal temperature rise in the MEP was 13.67 ± 2 °C higher than that in pure epoxy resin.

Fabrication of CeO2/CaO nanocomposite as ultraviolet screening agent and its application in sunscreen

In order to improve CeO2 ultraviolet absorption performance and transparency, this paper puts forward that different proportions of calcium oxide are doped during the formation of CeO2. Doping calcium ions with larger ion size and lower valence leads to the formation of oxygen defects by inhibiting the precipitation of oxygen from cerium oxide and keeps the fluorite structure of cerium oxide stable. The effects of CaO doping on the crystal structure, morphology, and optical characteristics of CeO2 were analyzed by XRD, SEM, TEM, TGA, XPS, UV–vis spectrophotometry. The pH of sunscreen, spread ability and some physical as well as chemical evaluations were carried out, while to study its UV protection performance the sunscreen SPF test was performed. The UV–vis results revealed that CeO2/20%CaO showed highly efficient UV absorption capacity. After adding calcium oxide, the catalytic activity of the material is reduced, due to which the generation of free radicals is demoted, and the harm to human body is decreased. After the addition of 3 wt% nanomaterials into sunscreen, the sun protection factor（SPF ）values of pure cerium oxide and CeO2/20%CaO are 1.95 and 2.81, and their sun protection coefficient is increased by 69.39%. Therefore, it is an ideal candidate as a component of ultraviolet screening agent in sunscreens and provides a new idea for the research direction of cerium oxide in anti-ultraviolet applications.

Potential use of Polyphenol-Enriched Extract from Moringa oleifera Leaves as an Active Ingredient in Sunscreen

Moringa oleifera is commonly referred to as the “tree of life” due to its high nutrient content and valuable biological activities. Widely found in tropical zones, this plant is usually used in local cuisine, cosmetic products and nutraceuticals. In this paper, we explored the potential of Moringa oleifera leaf alcoholic extract as a bioactive ingredient in sunscreen. Characterizations of extract were firstly investigated, including total polyphenol content, antioxidant activity. Formulations of extract containing creams were then created in order to examine its ability to protect against UVB radiation in the presence of other ingredients. Various evaluations of cream were carried out, including stability testing, UV absorption capacity, in vitro SPF values and microbial testing. The results revealed that Moringa oleifera extract showed a promising active ingredient in sunscreen, with a moderate antioxidant activity. Cream containing 2% of extract incorporated with 2% of oxybenzone demonstrated good in vitro SPF values.

Exploring marine algae-derived phycocyanin nanoparticles as a safe and effective adjuvant for sunscreen systems

BackgroundUV radiation (UV) exposure risks skin damage and cancer due to DNA damage and oxidative stress. Synthetic chemical sunscreens that protect against UV radiation can have health and environmental concerns. This study explores phycocyanin (PC), a marine algae-derived natural photoprotective compound, and its crosslinked nanoparticles (PCNP) as safe and effective adjuvants for sunscreen systems.MethodsPCNP was synthesized via genipin-crosslinking. PC and PCNP biocompatibility were assessed on mouse embryonic fibroblast cells. ABTS evaluated antioxidant activity, and the UV absorption capacity of PC and PCNP were analyzed. PCNP skin permeability was tested in vitro and in vivo. Gel formulations with PCNP were examined for UV absorption effects.ResultsPCNP showed good biocompatibility, maintaining cell viability above 90% across concentrations. Both PC and PCNP demonstrated concentration-dependent antioxidant activity, efficiently scavenging free radicals. PCNP exhibited enhanced UV absorption in the UVB range compared to PC alone. Skin permeation studies displayed limited PCNP penetration through skin layers. In vivo, absorption assessments indicated PCNP localized mainly in the stratum corneum. PCNP-containing gels displayed improved UV absorption compared to gels without PCNP.ConclusionThis study showcases PCNP’s potential as a natural and safe adjuvant for sunscreen with enhanced UV protection capabilities. PCNP preserved antioxidant activity, displayed limited skin penetration, and enhanced UV absorption. The findings suggest PCNP’s promise as a viable alternative to synthetic sunscreen agents, delivering effective photoprotection while minimizing health and environmental concerns.

Poly(methyl methacrylate)/hyperbranched polysiloxane hybrid prepared by gamma‐radiation polymerization: Thermal stability, optical transparence, and UV shielding

AbstractIt is challenging to endow poly(methyl methacrylate) (PMMA) with good dielectric properties and UV absorption capacity while simultaneously overcoming its poor heat resistance. Herein, we report for the first time a novel organic–inorganic hybrid (PMMA‐HBPSi) derived from methyl methacrylate (MMA) and hyperbranched polysiloxane (HBPSi) fabricated via γ‐radiation curing. The typical properties (thermal stability, optical characteristics, and dielectric properties) of the hybrids were systematically investigated and discussed. The results demonstrated that the incorporation of HBPSi into the PMMA resin not only increased the thermal resistance, dimensional stability, and dielectric properties but also remarkably reduced the UV transmittance. Specifically, in comparison with pure PMMA, the initial degradation temperature (Tdi) of PMMA‐HBPSi increased by 31°C, with no phase transition occurred in a temperature range of 60–230°C, thus illustrating a significant improvement in the glass‐transition temperature. Moreover, the thermal expansion coefficient decreased by 86.9% at temperatures exceeding 118°C. The UV transmittance of PMMA was also found to decrease by 80% at 295 nm after the introduction of HBPSi. These attractive features of PMMA‐HBPSi demonstrate that the new approach proposed here is suitable for developing high‐performance organic glasses for optical, aviation, and electronic applications.

A novel multisource energy harvester with enhanced thermal conductivity for efficient energy harvesting and superior EMI shielding

With the rapid growth of industries, renewable energy sources like wind and solar have emerged as prominent alternatives. However, their inherent intermittency demands the development of efficient energy harvester technologies. Conventional energy harvesters are limited to capturing a single energy type, resulting in compromised storage capabilities. Moreover, the detrimental effects of electromagnetic interference (EMI) on equipment necessitate immediate attention. To address these challenges, we present the development of a novel phase change composite, CMW@PEG, which possesses remarkable enhancements in thermal conductivity (1.26 W/m∙K), electrical conductivity (71.9 S/cm), and UV absorption capacity (close to 1). Notably, this composite exhibits an outstanding EMI shielding capability of 49.36 dB, safeguarding equipment operations effectively. Furthermore, it showcases impressive solar-thermal (87.9 %) and electric-thermal (93.3 %) conversion efficiencies. The unique properties of CMW@PEG offer a pioneering strategy for harnessing and utilizing renewable energy efficiently and hold tremendous promise in advancing the sustainable energy landscape.

An in-depth understanding of the effects of colorants on the structure and properties of borosilicate glasses for pharmaceutical packing

Fe2O3 and TiO2 were used as colorants in borosilicate glass, aimed to form amber-colored pharmaceutical glass. The status of the Fe and Ti ions and their influences on the glass structure were analyzed by FTIR, Raman and Mössbauer spectroscopic technique. The large addition of Fe2O3 led to the decrease of connectivity of silica network and the increase of [BO3]. TiO2 showed even larger depolymerization effect. Fe3+ coordinated with the bridging oxygen in [SiO4] increasing the aggregation of silica network and the [Fe2+O6] filled the voids of glass network. Both types of iron ions helped to restrain the mobility of Na+ and improved the water resistance of the glass, while TiO2 as a network modifier did the opposite. Either Fe2O3- or TiO2-containing samples exhibited enhanced UV-absorption capacity. The glass sample containing both Fe2O3 and TiO2 as colorants completely blocked the UV light, and exhibited the best water resistance. The results obtained herein enriched the understanding of the effects of colorants on borosilicate glasses and could provide useful information for the production of amber glasses used in pharmaceutical packing.

Carbon dots, cellulose nanofiber, and essential oil nanoemulsion from Torreya grandis aril added to fish scale gelatin film for tomato preservation

In this study, carbon dots (CDs), cellulose nanofibers (CNF) and essential oil nanoemulsion (EON) were extracted from the aril waste of Torreya grandis following nuts production. These three nanomaterials were formulated for the preparation of a composite film to be employed for postharvest tomato storage. Visual, microscopical and physicochemical properties of the prepared nanocomposite films were analyzed at different levels of CDs and CNF for optimization purposes. The UV absorption and antioxidant capacity of gelatin film with 10 % CDs (G/10CD) were enhanced compared with gelatin (G) film, concurrent with a reduction in water barrier capacity, water contact angle (WCA) and tensile strength (TS). Compared with G/10CD film, the WCA of G film after incorporation of 10 % CDs and 3 wt% CNF (G/10CD/3CNF) was significantly increased by 14.5°at 55 s. In contrast, TS increased by 1.26 MPa, as well as the significant enhancement in water barrier capacity. The above composite film mixed with EON (G/10CD/3CNF/EON) exerted further antimicrobial effects against Escherichia coli. G/10CD/3CNF/EON coating effectively extended tomato shelf life compared with the control group. Therefore, this new eco-friendly film presents several advantages of biodegradability, sustainability as well as multifunctional properties posing it as potential packaging material for food applications.

Sodium alginate/chitosan-coated TiO2NPs hybrid fiber with photocatalytic self-cleaning property, UV resistance and enhanced tensile strength

SA/CS-coated TiO2NPs hybrid fibers with photocatalytic self-cleaning properties, UV resistance and enhanced tensile strength were successfully prepared by adding CS-coated TiO2NPs to SA matrix. The FTIR and TEM results demonstrate the successful preparation of CS-coated TiO2NPs core-shell structured composite particles. SEM and Tyndall effect results showed that the core-shell particles were uniformly dispersed in the SA matrix. When the content of Core-shell particles increased from 0.1 to 0.3 wt%, the tensile strength of SA/CS-coated TiO2NPs hybrid fibers increased from 26.89 to 64.45 % compared with SA/TiO2NPs hybrid fibers. The SA/CS-coated TiO2NPs hybrid fiber (0.3 wt%) exhibits excellent photocatalytic degradation performance, achieving a 90 % degradation rate for the RhB solution. And the fibers also exhibit outstanding photocatalytic degradation performance towards various dyes and stains commonly encountered in daily life, including methyl orange, malachite green, Congo red, coffee and mulberry juice. The UV transmittance of the SA/CS-coated TiO2NPs hybrid fibers decreased significantly from 90 % to 75 % with the increase in core-shell particle addition, and correspondingly, the UV absorption capacity increased. The SA/CS-coated TiO2NPs hybrid fibers prepared lay the groundwork for potential applications in various fields, including textiles, automotive engineering, electronics and medicine.

Systematic studies on improving structural properties of myofibrillar proteins and pork quality based on electrical stimulation

SummaryElectrical stimulation (ES) is a green food processing technique in the meat industry. We explored the effect of different current (0.5 A, 1 A, the 90 s) ES treatments on the structural properties of the myofibrillar fibronectin (MP) and meat quality of pork tenderloin during storage at 4 °C. The results showed that ES enhanced the tenderness and redness of pork tenderloin by up to 41.36% and 27.33%, respectively, (P < 0.05) during storage but reduced the water holding capacity of the meat. Additionally, ES increases the solubility and sulfhydryl content of MP at the same storage time points, reducing the oxidation and thus making the structural properties of MP more stable, and the 1 A effect is more significant (P < 0.05). Furthermore, ES disrupts the protein secondary structure and also enhances the surface hydrophobicity and UV absorption capacity of MP. Overall, the relationship between the quality changes of ES‐treated pork tenderloin and the structural properties of the protein was initially described, providing a theoretical basis for the application of ES in the deep processing of pork.

A functional cobalt-organic framework constructed by triphenylamine tricarboxylate: Detect nitroaromatics by fluorescence sensing and UV-shielding

Luminescent metal-organic frameworks (LMOF) with ligand-modified are a promising strategy to be applied to fabricate chemical sensors. Herein, a novel Co (II) metal-organic framework (Co-MOF), namely Co [(NTB) bpy] (NTB = 4,4′4″-tricarboxylic acid triphenylamine, bpy = 4,4 ′-bipyridyl), was successfully synthesized with excellent water stability and fluorescence properties. Due to the propeller structure of NTB ligands, a special topological structure of Co-MOF was shown: {24.416.68}{2}4. It was proved that Co-MOF has great stability by soaking in different solvents for two weeks. Remarkably, the fluorescence quenching experiment verified that Co-MOF has excellent fluorescence sensor performance. Trinitrophenol, 2,4-dinitrophenol, and 2-amino-4-nitrotoluene (10−5 M) with LOD of 9.00 × 10−5, 5.40 × 10−5 and 5.07 × 10−6 M can be detected via the process of fluorescence enhancement and quenching. Throughout the investigation, the mechanics of fluorescence quenching was performed. Due to the excellent UV absorption capacity of Co-MOF, it was a promising application to combine low-dimensional nanomaterials with sustainable biomass materials. A hybrid films of Co-MOF and cellulose acetate (CA) was generated. The hybrid films had highly transparency in the visible wavelength range and excellent UV-shielding ability owing to the CA/Co-MOF hybrid films enhanced the UV absorption capacity of Co-MOF.

Microalgae growth rate multivariable mathematical model for biomass production

BackgroundThe use of microalgae has been emerging as a potential technology to reduce greenhouse gases and bioremediate polluted water and produce high-value products as pigments, phytohormones, biofuels, and bioactive compounds. The improvement in biomass production is a priority to make the technology implementation profitable in every application mentioned before. MethodsThe present study was conducted to explore the use of microalgae from genus Chlorella and Tetradesmus for the generation of substances of interest with UV absorption capacity. A mathematical model was developed for both microalgae to characterize the production of microalgae biomass considering the effects of light intensity, temperature, and nutrient consumption. The model was programmed in MATLAB software, where the three parameters were incorporated into a single specific growth rate equation. ResultsIt was found that the optimal environmental conditions for each genus (Chlorella T=36°C, and I<787 μmol/m2s; Tetradesmus T=23°C and I<150 μmol/m2s), as well as the optimal specific growth rate depending on the personalized values of the three parameters. ConclussionThis work could be used in the production of microalgae biomass for the design and development of topical applications to replace commercial options based on compounds that compromise health and have a harmful impact on the environment.

Valorization of flavonoid-rich invasive weed-Eupatorium adenophorum in the cleaner production of coloristic and functional wool fabric with a research focus on photofading mechanism

The ecological destructions and economic losses caused by the invasion of Eupatorium adenophorum have been perplexing researchers and governments. The resource utilization of invasive weeds provides an emerging direction for the control and management of Eupatorium adenophorum. The objective of this study is to utilize Eupatorium adenophorum as a cost-effective source of flavonoid compounds for the cleaner production of coloristic and functional wool. First, the extraction, purification, and identification of Eupatorium adenophorum flavonoids (EAFs) were investigated. The crude extraction of EAFs was implemented by using ethanol/water and the highest total flavonoid content of 37.8 mg rutin equivalent/g was obtained. The crude EAFs extract was further purified by using macroporous adsorption resin. The main components of purified EAFs were patuletin and myricetin, identified by FT-IR and liquid chromatography-mass spectrometry (LC-MS). Afterward, the adsorption mechanism and dyeing performance of EAFs on the pre-mordanted wool were studied. Results stated that the adsorption between them belonged to mono-layer adsorption driven by coordination bond, electrovalent bond, and hydrogen bond, which endowed the dyed wool with a good color fastness of rubbing and washing. The building-up property of EAFs on wool fabric was quite acceptable, implying the feasibility of large-scale production. In addition, the dyed wool showed a ultraviolet protection factor value of 345 and a half-life period of 0.89 s (at 65% relative humidity), demonstrating excellent UV-shielding and antistatic properties, respectively. The improved functionalities of dyed wool were owing to the good UV absorption capacity and hygroscopicity of flavonoids. However, such dyed wool suffered from photofading due to the inferior photostability of EAFs. For exploring the photofading mechanism of dyed wool, the photo-degradation pathway of EAFs on the fabric was speculated based on the detection of the photo-degradation products of EAFs by LC-MS. The founding of some colorless hydroxybenzoic acids in the photo-degradation products suggested the occurrence of oxidation and ring-opening of pyranone structure in flavonoids. In general, our work made an attempt to valorize invasive weed in the green dyeing and finishing of wool and provided theoretical support for the development of the light resistance of flavonoid-treated wool.

Photocatalytic efficiency of green synthesized ZnO nanoparticles for the degradation of methyl orange dye: A review

The primary global source of water pollution is industrial and textile dyes. These industries produce Highly stable organic dyes that are released untreated into nearby ponds, lakes and rivers. As ZnO nanoparticles (NPs) are inexpensive, non-toxic, chemically and thermally stable, and have a higher UV absorption capacity, they are an effective nano-catalyst for removing hazardous contaminants such as organic and inorganic dyes from wastewater. The green synthesis of synthesised ZnO NPs, their shape and size, and their photocatalytic effectiveness against the dye methyl orange are all described in this paper. The emphasis is on environmentally friendly synthesis of ZnO NPs using plant extracts because the synthesis process impacts the characteristics and applications of ZnO NPs. Additionally, based on recently published literature, the shape and size factors that affect the photocatalytic activity in the degradation of MO dye are highlighted.

A polymerizable difunctional photoinitiator featuring a bio-based group and its photoinitiating properties

A polymerizable difunctional photoinitiator 2-methylene-succinic acid bis-{2-[4-(2-hydroxy-2-methylpropionyl)phenoxy]ethyl} ester (IAHHMP) based on the commercial photoinitiator 2-hydroxy-1-[4-(2-hydroxyethoxy)phenyl]-2-methylpropanone (HHMP) and a biorenewable itaconic acid is synthesized by esterification. The structure is confirmed by ultraviolet spectroscopy, Fourier transform infrared spectroscopy, nuclear magnetic resonance spectroscopy (1H NMR, 13C NMR) and thermogravimetric analysis. The photopolymerization behaviour of the photoinitiator is investigated using photo-differential scanning calorimetry and compared with that of two commercial photoinitiators, HHMP (or photoinitiator 2959) and 1-hydroxycyclohexyl phenyl ketone (or photoinitiator 184). The results show that IAHHMP has a strong UV absorption capacity at 245~300 nm and can initiate polymerization of monomers containing a double bond. The relative migration of IAHHMP is less than that of the systems containing an HHMP or 1-hydroxycyclohexyl phenyl ketone photoinitiator. Therefore, IAHHMP is expected to have potential applications in more environmentally friendly materials, such as in food and medical packaging.

In Situ Functionalization of Cellulose with Polyoxometalate for UV-Resistant Performance

ABSTRACT Polyoxometalate-based composite materials have recently attracted extensive attention due to their unique structural characteristics and physicochemical properties. In the present work, a flexible anti-UV blocker compatible with cotton fabric was prepared by simple covalent bond self-assembly of carboxyl group (−COOH) and phosphomolybdate. The resultant cotton fabrics were investigated and confirmed by FT-IR, PXRD and SEM-EDS, demonstrating the successful preparation of polyoxometalate-based composite fabric. The UV spectrum of as-designed composite fabric imparts excellent UV absorption capacity and the UPF value reaches 397.19, which is far superior to original cotton (7.09). Furthermore, the blocker was tested on the photosensitive material in direct UV irradiation, which proved its outstanding performance as a flexible, wearable, and visualized UV blocker. In addition, the experimental results confirmed that the prepared composite material exhibited an excellent and stable UV resistant performance (UPF: 100+) after 5 days UV aging irradiation and five times washing. The proposed fabrication strategy could promisingly endow polyoxometalate-based fiber materials with extensive applicability potential.