UV Irradiation Time Research Articles

Polyacrylamide/sodium alginate photochromic hydrogels with enhanced toughness and fast response for optical display and rewritable information record

Photochromic hydrogels have broad prospects in wearable optoelectronic technology, rewritable information storage technology, biological imaging agents and chemical sensors, etc. However, it is still a challenge to develop photochromic hydrogels with high transparency, mechanical properties, fast response, stability and color reversibility. In this study, a novel photochromic hydrogel (PAAm/SA-Mo7) was prepared by loading ammonium molybdate (Mo7) into a double-network hydrogel of polyacrylamide (PAAm) and sodium alginate (SA) through a facile one-step method. The introduction of SA and Mo7 significantly improved the mechanical properties of hydrogels, and the maximum elongation and breaking energy are 27.5 and 86 times higher than those of pure PAAm. Furthermore, the photochromic hydrogels have fast response and stable reversible color change. The coloring process of hydrogels can be precisely controlled by the time and intensity of UV irradiation, and the fading process can also be controlled by temperature. The photochromic hydrogel can be applied to self-erasing rewritable media and information storage. This work provides a new approach for the development of flexible wearable optoelectronic materials.

Predicting the degradation of reactive red-147 dye in textile wastewater using response surface methodology technique

The human health, aquatic life and environment are greatly affected by the existence of industrial waste in water especially the textile dye. Advanced oxidation processes (AOPs) are considered more effective in removing the toxic pollutants from the waste water in comparison with traditional biological, physical and chemical processes. The later have the limitations of high energy requirement, cost and production of secondary pollutants during the treatment process. AOPs received significant attentions to eliminate the recalcitrant dyes from the aqueous environment owing to the production of highly reactive hydroxyl radicals produced via light irradiation. This study focused on using the response surface methodology (RSM) to evaluate its prediction and optimizing capability in the deployment of AOPs in removing obstinate pollutants from industrial waste water. The data were obtained from the existing literature related to the decomposition of textile dye [reactive red (RR-147)] under UV illumination in the presence of hydrogen peroxide (H2O2) and the photocatalyst, i.e., titanium dioxide (TiO2). The influence of different process parameters like dye concentration, pH of the solution, H2O2 contents, UV illumination time and photocatalyst were studied on dye removal percentage. The input parameters for efficient removal process were optimized using developed RSM models. Four different scenarios were created to see the effect of selected parameters while keeping the remaining process parameters maintained at fixed values. The predicted results depicted that the dye removal percentage was mainly affected by the tested variables, as well as their synergistic effects which was observed compliant with the experimental results. Performance analysis of the developed RSM models showed a high coefficient of determination value significantly higher than R2 = 0.99), thus guaranteed a satisfactory prediction equations of the second-order regression models. The observed results showed that for 50 ppm dye concentration, H2O2 0.9 ml, pH 3.4, TiO2 0.6 g and UV irradiation time 60 min, the maximum breakdown of 92% was observed. The degradation of the RR-147 dye is tested to be more effectively accomplished by the UV/H2O2/TiO2 system.

Synthesis of a naphthalenediimide with photo-induced fluorescence enhancement and its visual dual-response to highly polar solvents

A photochromic 1,4,5,8-naphthalenediimide (NDI) derivative N,N-bis(4,6- diamino-1,3,5-triazinyl-2-)naphthalenediimide (DDNDI) was synthesized and the photo-induced fluorescence enhancement of DDNDI was found for the first time for NDI materials, the fluorescence intensity increases with the increase of sunlight or UV irradiation time. For sunlight irradiation, it shows a linear relationship of y=22.38821x+85.37868 (R=0.9987). And the photochromism and fluorescence of the DDNDI solution have synchronous “on-off” characteristic. Under continuous irradiation, the photochromic color of the DDNDI solution changes from colorless to yellow and the fluorescence color changes from colorless to green. After adding polar solvent, photochromism and fluorescence can be suppressed simultaneously due to the twisted intramolecular charge transfer (TICT) and the photoinduced electron transfer (PET). Based on the dual changes of photochromic and fluorescent colors caused by UV, visual dual-response to highly polar solvents can be observed, and the fluorescence intensity is linearly related to the amount of the added DMSO: y=-1.21857x+780.04855 (R=0.9966). • Photo-induced fluorescence enhancement for the naphthalenediimide materials is found first. • The photo-induced fluorescence enhancement is linearly related to the sunlight irradiation time. • The mechanism is investigated by the turn on and off of the fluorescence and photochromism simultaneously.

Synergism in sequential inactivation of Cryptosporidium parvum with trypsin and UV irradiation.

Cryptosporidium, a protozoan parasite, in wastewater presents a major public health concern for water safety. However, bactericidal efficiencies of conventional disinfection methods towards Cryptosporidium oocysts are still hampered owing to the presence of their thick outer wall. In this study, we present a novel UV inactivation process where the efficiency has been significantly enhanced by addition of a trypsin pretreatment stage. Notably, inactivation (log-reduction) of oocysts was noted to be 73.75-294.72% higher than that obtained by UV irradiation alone, under identical conditions. Experimental observations and supporting mechanistic analyses suggest that trypsin led to cleavage of the protein layers on the oocyst wall, facilitating penetration of UV radiation into the oocysts leading to degradation of their genomic DNA (gDNA). The dissociative effect of trypsin on the oocyst wall was indicated by the fact that 64.50% of oocysts displayed early apoptosis after trypsinization. Imaging by scanning electron microscopy indicated that this combined treatment led to substantial disruption of the oocyst coat, deforming their shape. This resulted in the release of cellular proteins and gDNA, their concentrations in bulk solution increasing by 1.22-8.60 times. As UV irradiation time was prolonged, gDNA was degraded into smaller fragments with lower molecular masses. Both laddering and diffuse smear patterns in gel analysis indicated significantly detrimental effects on gDNA and viability of oocysts. Overall, this study demonstrated enhancement of UV inactivation of Cryptosporidium oocysts by trypsin and explored the underlying mechanisms for the process.

Fabrication of ultraviolet/thermal-sensitive PMMA/PDMS wrinkle structures and the demonstration as smart optical diffusers

Although smart optical diffusers have received increasing attention for the next generation of flexible optoelectronics, the exploration and fabrication of low-cost ultraviolet/thermal-sensitive optical diffusers are still challenging. In this study, we used a cost-effective method to fabricate flexible PMMA/PDMS wrinkle structures, demonstrating their applicability as tunable ultraviolet/thermal-sensitive optical diffusers. As the temperature gradually increased, the wrinkle wavelength changed slightly while the amplitude decreased. The wrinkle wavelength remained unchanged after UV light exposure, while the wrinkle amplitude decreased with the illumination time. When the fabricated structures were used as optical diffusers, the number of light diffraction pattern rings decreased with the wavelength of the wrinkle structures. Optical diffusers with different wrinkle patterns and the same aspect ratio exhibited different diffusing properties. The number of apertures and the coverage area of the diffused spot gradually decreased when the optical diffuser structure was exposed to heating. Remarkably, the optical diffusers could recover to their original state quickly after cooling. The number of apertures and the coverage area of the diffused spot gradually decreased with UV irradiation time. The prepared PMMA/PDMS wrinkle structures exhibit great potential for intelligent displays, wise medical systems, and other smart devices.

Photochromism of TiO2 Nanoparticles Doped with Molybdenum Ions: Neutral Color Change from Colorless to Black via Gray.

Transition metal oxide nanoparticles have been extensively studied for the development of smart windows which are expected to be a promising technology to save energy in buildings. However, most of them turn blue under UV irradiation. Since the blue coloration affects the color of objects through the windows, the development of materials with a neutral color which hardly disturbs the view is more beneficial. In this work, we prepared a colorless-transparent TiO2 colloidal solution containing Mo6+ ions (Mo-TiO2), which turns black via gray in a nitrogen atmosphere under UV irradiation. An absorption peak was observed at 535 nm, which increased with an increase in the UV irradiation time and reached a constant value (Absmax). The Absmax value increased linearly with an increase in the Mo doping amount. We demonstrated that the photochromic behavior of the Mo-TiO2 nanoparticles is completely different from that of pure MoO3 or the mixture of MoO3 and TiO2. In addition, we performed a kinetic study to elucidate the mechanism and found that the coloration rate at the initial stage decreased with an increase in Mo doping amount. Based on the kinetic analysis, the following results are obtained: a color center is formed at a deeper energy level than the Mo dopant level; the number of the color center depends on the Mo doping amount, and the color center traps the photogenerated electrons more rapidly when it is isolated. The black color was bleached by purging the air in the solution. In particular, the gray state which is observed as a transient color is promising for the development of smart windows to shield the sunlight while allowing a clear and undistorted view.

Optimal Serum 25(OH)D Level and Vitamin D Intake in Young Korean Women.

Vitamin D status is essential for preventing bone disease. Young Korean women have the highest vitamin D deficiency prevalence compared with other demographic groups. This study aimed to establish the optimal vitamin D intake level for maintaining an adequate serum 25-hydroxyvitamin D (25[OH]D) level by season in young Korean women (mean age: 23.1 years). Each participant (wintertime, n = 101; summertime, n = 117) completed a lifestyle survey, dietary record, bone mineral density, and biochemical tests. Seasonal factors impacting 25(OH)D were identified, vitamin D intake for sufficient 25(OH)D levels was calculated, and the relationship between 25(OH)D and intact parathyroid hormone (iPTH) was analyzed. During summertime, 25(OH)D levels were higher than in wintertime (17.9 vs. 15.0 ng/mL). A 1 µg/1000 kcal increase in vitamin D intake increased 25(OH)D levels by 0.170 ng/mL in wintertime and 0.149 ng/mL in summertime. iPTH levels reached a theoretical plateau corresponding to an 18.4 ng/mL 25(OH)D level. The vitamin D intake threshold for maintaining 25(OH)D levels at ≥20 and ≥18.4 ng/mL was ≥10.97 μg/day. For a sufficient level of 25(OH)D in young Korean women, increasing summertime UV irradiation time and increasing vitamin D supplements and vitamin D-containing foods throughout the year is beneficial.

A facile method for fabricating super-slippery surface with long term and high-efficiency sustained release performance

Slippery liquid infused porous surfaces (SLIPS) process potential applications in surface liquid repellency, self-cleaning and anti-adhesion, while exhibiting long-term and stable release of lubricants is remaining a great challenge. Herein, an efficient liquid injection method was proposed to construct SLIPS by altering the surface energy and adjusting the inner porous structure using the facile method of direct UV irradiation. The infusion efficiency and release behavior were significantly improved and verified with various techniques such as wetting measurement, confocal fluorescence microscopy and optical microscopy. It was found that the infusion and release behavior of lubricants were varied for different specimens with different UV irradiation time. Compared to the prime substrate, PDMS treated with 90 min UV irradiation showed the highest volume of lubricant penetration which was increased almost by 833 %. Additionally, the amount of infusion consisted with the surface energy and specimens with moderate wetting exhibited the most effective lubricating performance. For the sample with 90 min UV irradiation, an ultra-low friction coefficient of 0.018 was observed under water lubrication and its releasing could be detected even after a long period of 768 h. Our results provided a facile method for the future development of long-term lubricating surfaces which may broaden their applications in fields of anti-corrosion, anti-icing and anti-fog, anti-fouling, micro-flow control and oil-water ultra-slippery occasions.

Fast and Reversible Photoresponsive Self-Assembly Behavior of Rosin-Based Amphiphilic Polymers.

Designing stimulus-responsive amphiphilic polymers with a fast photoresponsive self-assembly behavior remains a challenge. Two series of rosin-terminated and azobenzene-terminated amphiphilic polymers (PAMn and PMAn) with fast and reversible photoresponsive properties were prepared using rosin-based azobenzene groups and polyethylene glycol, respectively. Under 5-10 s of UV irradiation, the polymers showed trans-to-cis isomerization and reached a photosteady state. For the PAMn polymer, the absorbance of the absorption peak at 325 nm recovered to more than 95% of the initial value under visible light for 5-10 s, whereas that of the PMAn polymer recovered completely. Notably, the PAMn and PMAn polymers initially self-assembled to vesicles or spherical micelles, and various morphological changes were achieved by manipulating UV irradiation time, with the initial morphology again recovered under dark conditions or visible-light irradiation. Remarkably, vesicles of the PAM34 and PMA34 polymers presented an intermediate open-vesicle state before being completely deformed under UV irradiation because of the existence of a π-π interaction. Finally, the ability of PAM34 and PMA34 polymer vesicles to perform the controlled release and reversible loading of a fluorescent probe was evaluated.

Ionizing radiation based advanced oxidation process for reactive orange 122 dye degradation and kinetics studies

Abstract In the current study, the degradation of reactive orange 122 (RO 122) dye was carried out under UV and gamma irradiation in presence of H2O2. The effect of variables such as UV exposure time, gamma-ray absorbed dose, initial concentration of dye and oxidant dose were investigated. The removal of 64.10, 58.84 and 55.46 (%) was observed for 50, 100 and 150 (mg/L) dye concentrations, respectively using UV radiation time of 150 (min). The degradation was enhanced to 80.39, 69.95 and 67.01 (%) when UV radiation was employed in the presence of H2O2 (0.5 mL/L) for above concentrations respectively. The degradation was further improved to 97, 92.54 and 81.32 (%) using 5 kGy absorbed dose along with H2O2 (0.5 mL/L). The reduction in chemical oxygen demand (COD) was 77, 64 and 57 (%) using UV/H2O2 (0.5 mL/L), while 63, 56 and 53 (%) in case of gamma/H2O2 for aforementioned concentrations. The removal efficiency (G-value), dose constants (k), dose indispensable for 50, 90 and 99 (%) degradation (D 0.5, D 0.90, and D 0.99) after the treatment with gamma radiation were determined. The G-value was noted as 0.46–0.0711 for 50–150 mg/L dye concentration for gamma irradiated samples which improved to 0.57–0.1204 for above mentioned concentrations in presence of H2O2. The FTIR analysis showed that all the peaks were disappeared using gamma/H2O2 at 5 kGy absorbed dose except a minor peak of −CO stretching. The degradation mechanism of dye followed pseudo-first-order kinetics. A significant decrease in peak area was observed by the HPLC analysis after treating the dye samples with gamma/H2O2 (0.5 mL/L) at absorbed dose of 5 kGy which has proven the process efficiency for dye degradation.

Study on enhanced photoluminescence properties of Au surface-modified ZnO NRAs composites

Au nanoparticles were deposited on the surface of ZnO nanorods arrays (NRAs) by photoreduction method under different UV irradiation time. The content and size of Au nanoparticles deposited on ZnO nanorods become larger with the increase of UV irradiation time. In addition, When the UV irradiation time is 40 min, the UV emission peak and UV–visible ratio of the prepared Au surface-modified ZnO NRAs are relatively largest, and the visible emission peak of that is relatively smallest, indicating that its photoluminescence performance is relatively best. The study indicates the Au surface-modified ZnO NRAs composites are promising candidate for light emitting applications.

바이오매스 부산물에 상용화제를 첨가하여 제조한 멀칭필름의 분해 실태 연구

Mulching film was produced by LDPE and LLDPE adding biomass byproducts and MA(maleic anhydride), talc/clay/CaO/CaCO3. And also surveyed to tensile strength, elongation, TGA and DSC according to the UV irradiation time. The tensile strength and elongation showed 20 N/cm2 and 5% after UV irradiation 100 hours, and those was nearly 0 N/cm2 and 0% after 200 hours, respectively. TGA of film was showed to peak of polymer itself, and DSC was slightly higher than that of initial value. At the pilot scale test, we were able to see the differentiate of degradation between control and developed film after 12 weeks, and also torn off at several part of mulching film. The degradation of mulching film after growing corn showed similar to a pilot scale test. Above the results, the developed mulching film adding biomass will be to used for agricultural farming.

Photocatalytic Properties of Co-precipitated Bismuth Cobalt Ferrite

Bismuth substituted cobalt ferrite nanoparticle is studied for photocatalytic in this paper. Bismuth cobalt ferrite has been synthesized by the coprecipitation method and low-temperature annealing treatment. The characterization results showed that the XRD spectral pattern is consistent with ICDD 221086. The crystallite size of bismuth cobalt ferrite increases with increasing annealing temperature. FTIR results confirm the available metal-oxide at number wave around 570/cm and 475/cm which is the appearance of octahedral and tetrahedral sites owing cobalt ferrite. The photocatalyst test was carried out by varying the catalyst mass and UV irradiation time. The absorption spectrum decreases with increasing catalyst mass. The increase in UV irradiation time causes the formation of more holes (h+) and electrons (e-). So that the hydroxide reaction occurs that produces free radicals. The results of this study indicate that cobalt ferrite-based nanoparticles have potential as photocatalyst materials.

Enhanced trichloronitromethane formation during chlorine-UV treatment of nitrite-containing water by organic amines

This study explored the risk of trichloronitromethane (TCNM) formation during chlorination of the nitrite-containing water after pre-chlorination and subsequent UV irradiation (i.e., the chlorine-UV process). The competitive reaction between amino acid (AA) and NO2− for chlorine produced organic chloramine and reduced the oxidation from NO2− to NO3−, resulting in a significant enhancement of TCNM in the presence of AA (>5.52 μg L−1) as compared to the absence of AA (0.42 μg L−1). The generation of HO• during UV photolysis of organic chloramines was confirmed. Among the process parameters, pre-chlorination time (from 5 min to 30 min) had no significant effect on TCNM formation; the highest TCNM formation occurred at pH 7 (from pH 6 to pH 8); prolonged UV irradiation time (from 5 min to 30 min) and increased chlorine to AA ratio (Cl2:AA) (from 1 to 3) decreased the TCNM formation. The hydroxylated, chlorinated and nitrosated products were detected. The quantum chemical calculation results indicated the attack of NO2• was more likely to occur at the meta and para positions of benzoic acid (BZA), because of the steric hindrance of the carboxylic group in BZA to the ortho position. Based on the results of the toxicity assessment, pre-chlorination with a higher chlorine dosage could be an effective method of controlling both TCNM formation and acute toxicity. Overall, the results of this study contributed to the understanding of the TCNM formation mechanism as well as optimizing the parameters of the chlorine-UV process to reduce the risk of TCNM formation.

Green synthesis of (CS/OLE) AgNPs and evaluation of their physico-chemical characteristic

The present article involves the bio-synthesis of (Chitosan/olive leaf extract) silver nanoparticles (CS/OLE) AgNPs using a simple green electrochemical procedure followed by UV-irradiation time. The properties and structure of the resulting (CS/OLE) AgNPs were characterized by employing several analytical techniques including, Infrared spectrum (FT-IR), UV–VIS spectroscopy, X-ray analysis (XRD), energy-dispersive X-ray (EDX) and degredation. Besides, the studying of the thermal characteristics of the (CS/OLE) AgNPs electrets were also investigated. Formation of Ag nanoparticles was observed upon varying the solution color from faint yellow into yellowish brown and was achieved by the appearance of absorption peak at about ~ 410 nm of the resulting AgNPs corresponding to the surface plasmon resonance (SPR). The sharp peaks appear at 32.16°, 46.19°, 54.75°, 57.59°, and 76.7°, indicating the presence of AgNPs as shown from XRD. With comparing the anti-bacterial efficiency of (CS/OLE) AgNPs and (CS/OLE) we found that the AgNPs display a relatively high anti-bacterial activity than in plant extract and chitosan alone. The electrical properties of (CS/OLE) AgNPs films were studied by global thermally stimulated depolarization current (TSDC) spectra for explaining the relaxation phenomena of the samples. In addition, the molecular parameters (The activation energy Ea and pre-exponential time τo), have been evaluated by the Arrhenius equation. The Ea was found in ~ (0.39–0.62 eV) for (CS/OLE).

Electro-optical characteristics of polymer-dispersed liquid crystal containing copper (II) phthalocyanine as a function of UV irradiation time

We describe a method of dispersing copper (II) phthalocyanine that can expand the application range of polymer-dispersed liquid crystals (PDLCs) among smart-window technologies. Property changes were monitored during the polymerization-induced phase separation method as the ultraviolet (UV) irradiation time was increased from 70 to 175 s. With increasing UV irradiation time, the number of droplets in the polymer matrix within the PDLC increased, while the droplet size decreased, as observed by polarized optical and low vacuum-scanning electron microscopies. Voltage–transmittance and response time were measured to observe the effects on electro-optical properties; the threshold and saturation voltages increased with increasing UV-irradiation time. The falling time of the response decreased with increasing irradiation time; a fast switching time of < 20 ms was observed in all cases. This study provides the performance of the produced PDLC varies according to the UV irradiation time, and conditions and processes necessary for producing blue PDLC are presented.

Effect of UV irradiation on microbial structure, metabolic pathways and functional genes of nitrogen metabolism in highland wastewater

&lt;p&gt;In this experiment, in the background of the plateau environment, the effects of ultraviolet irradiation on the microbial community structure, metabolic pathways and nitrogen metabolism function genes of sewage were studied at 0 (control group), 5, 10, 30, and 180 min. The results showed that the increase of UV irradiation time promoted the microbial richness of sewage, but decreased the microbial diversity. In terms of community structure, the increase of ultraviolet irradiation time will inhibit or promote some bacterial genera, for example, it has a promoting effect on Bacteroidota, norank_f_ Saprospiraceae, etc., and an inhibitory effect on Phreatobacter. The relative abundance of metabolic pathways changed significantly with the increase of UV irradiation time, and the change trends at different metabolic levels were the same. In nitrogen metabolism pathways, the relative abundance of genes involved in nitrification and denitrification functions was inhibited by the duration of UV irradiation.&lt;/p&gt;&#x0D;

Effects of UV Aging on Physical Properties and Physicochemical Properties of ASA Polymer-Modified Asphalt

The purpose of this study was to characterize and evaluate the effects of UV radiation on the rheological and physicochemical properties of ASA polymer-modified asphalt. The conventional properties (penetration, softening point, ductility, and Brookfield viscosity) of ASA polymer-modified asphalt were tested. Based on rheology, the effect of different UV irradiation times on the high-temperature performance of ASA polymer-modified asphalt was systematically characterized, the thermogravimetric analyzer (TGA) was used to analyze thermogravimetric properties of ASA polymer-modified asphalt, and the micromorphological characteristics of ASA-modified asphalt under different UV irradiation times were characterized by scanning electron microscope (FIB-SEM). The results show that the ASA polymer has a significant effect on the basic properties of asphalt. Compared with the base asphalt, the high-temperature stability of the modified asphalt was decreased, and the low-temperature ductility performance was improved. ASA polymer can effectively reduce the aging effect of ultraviolet radiation on the base asphalt and inhibit the generation of microcracks. ASA polymers improve the thermal stability of asphalt binders. During the aging process, the formation of carbonyl and sulfoxide groups was inhibited, indicating that ASA polymer can effectively delay the UV aging of asphalt.

Photoinitiator Selection and Concentration in Photopolymer Formulations towards Large-Format Additive Manufacturing.

Photopolymers are an attractive option for large-format additive manufacturing (LFAM), because they can be formulated from structural thermosets and cure rapidly in ambient conditions under low-energy ultraviolet light-emitting diode (UV LED) lamps. Photopolymer cure is strongly influenced by the depth penetration of UV light, which can be limited in the 2–4 mm layer thicknesses typical of LFAM. Photoinitiator (PI) systems that exhibit photobleaching have proven useful in thick-section cure applications, because they generate a photoinitiation wavefront, but this effect is time-dependent. This study investigates the light transmission and through-thickness cure behavior in (meth)acrylate photopolymer formulations with the photobleaching initiator bis(2,4,6-trimethylbenzoyl)-phenylphosphine oxide (BAPO). Utilizing an optical model developed by Kenning et al., lower concentrations (0.1 wt% to 0.5 wt%) of BAPO were predicted to yield rapid onset of photoinitiation. In situ cure measurements under continuous UV LED irradiation of 380 mW/cm2 showed that a 0.1 wt% concentration of BAPO achieved peak polymerization rate within 2.5 s at a 3-mm depth. With only 1 s of irradiation at 1.7 W/cm2 intensity, the 0.1 wt% BAPO formulation also achieved the highest level of cure of the formulas tested. For an irradiation dose of 5.5 J/cm2 at a duration of 3.7 s, cured polymer specimens achieved a flexural strength of 108 MPa and a flexural modulus of 3.1 GPa. This study demonstrates the utility of optical modeling as a potential screening tool for new photopolymer formulations, primarily in identifying an upper limit to PI concentration for the desired cure depth. The results also show that photobleaching provides only a limited benefit for LFAM applications with short (1.0 s to 3.7 s) UV irradiation times and indicate that excess PI concentration can inhibit light transmission even under extended irradiation times up to 60 s.

Photochemical assisted novel formation of δ-lactone utilizing trimethylsilylacetylene, isopropanol and ironpentacarbonyl

As evidenced by previous research, photochemical reaction of terminal acetylene and ironpentacarbonyl produces a variety of products with slight changes in reaction conditions. The time of UV-irradiation is one of the most important parameter which decide the selectivity of the product of the reaction. In this report, a novel method for the synthesis of a (tricarbonyl)iron complex of δ-lactone/2-pyranone has been achieved by photochemical reaction of trimethylsilyl acetylene, ironpentacarbonyl and iso-propanol. The pyranone ring was formed by the cyclization of acetylene, iso-propanol and carbonmonoxide. Further, the Fe(CO)3 moiety coordinatively attaches to the π-electron clouds of lactone ring. The successful transformation of 2-pyranone from the (tricarbonyl)iron complex of 2-pyranone was also established by following the demetalation of Fe(CO)3. The formation of (tricarbonyl)iron complex and 2-pyranone were confirmed by various spectroscopic techniques, which includes the 1H, 13C and mass spectrometry. Moreover, the molecular structure of (tricarbonyl)iron complex of δ-lactone or 2-pyranone was established by the single crystal X-ray diffraction analysis.