Gas Solid Phase Research Articles

Application of sodium bicarbonate abrasive jet technology for PCB desmear process: Conditions and simulation

The desmear of blind hole is a critical process in Printed Circuit Board (PCB) manufacturing. An environmental-friendly, non-destructive and efficient sodium bicarbonate abrasive jet desmearing method was proposed in this study. The desmearing process was to drive the abrasive particles into the blind hole by pressurized air, and realized the cleaning of drilling dirt through collision. By comparing the cleaning effect, the process parameters (jet pressure, jet time, jet angle and jet distance) of sodium bicarbonate abrasive jet desmearing method were optimized, and the optimal process parameters were determined as 0.3 MPa, 10 s, 90° and 1 cm. Under the optimal process conditions, by comparing with the permanganate swelling method that widely used in the industry, it was confirmed that the cleanliness of sodium bicarbonate abrasive jet desmearing method could reach the commercial cleaning level while ensuring no damage, and the improvement of surface roughness (Ra = 7.57220 μm) was also at the same level. Through the research on the abrasive recycling process, it was detected that the recovery rate of abrasive could reach 80.18% by a simple recrystallization operation, which could significantly reduce the cleaning cost. The trajectory of abrasive particle in the blind hole was simulated by the gas-solid coupling discrete phase model (DPM), and the vortex cutting erosion desmearing mechanism based on the analysis of velocity vector characteristics was proposed. Due to its advantages of high cleaning efficiency, low damage, less pollution and recyclability of abrasive, the sodium bicarbonate abrasive jet desmearing method was expected to be applied in PCB blind hole desmearing process in the future.

Inerting characteristics of ultrafine Mg(OH)2 on starch dust explosion flame propagation

Experiments on the flame propagation of starch dust explosion with the participation of ultrafine Mg(OH)2 in a vertical duct were conducted to reveal the inerting evolution of explosion processes. Combining the dynamic behaviors of flame propagation, the formation law of gaseous combustion products, and the heat dissipation features of solid inert particles, the inerting mechanism of explosion flame propagation is discussed. Results indicate that the ultrafine of Mg(OH)2 powders can cause the agglomeration of suspended dust clouds, which makes the flame combustion reaction zone fragmented and forms multiple small flame regions. The flame reaction zone presents non-homogeneous insufficient combustion, which leads to the obstruction of the explosion flame propagation process and the obvious pulsation propagation phenomenon. As the proportion of ultrafine Mg(OH)2 increases, flame speed, flame luminescence intensity, flame temperature and deflagration pressure all show different degrees of inerting behavior. The addition of ultrafine Mg(OH)2 not only causes partial inerting on the explosion flame, but also the heat dissipation of solid inert particles affects the acceleration of its propagation. The explosion flame propagation is inhibited by the synergistic effect of inert gas-solid phase, which attenuates the risk of starch explosion. The gas-solid synergistic inerting mechanism of starch explosion flame propagation by ultrafine Mg(OH)2 is further revealed.

Influence of transition metal catalysts on the decomposition product distribution of PCBs and PCDD/Fs

In this study, reliable and stable polychlorinated biphenyls (PCBs) and polychlorinated dibenzo-p-dioxins/dibenzofurans (PCDD/Fs) generation systems were used to investigate catalyst performance. The distribution characteristics of PCBs and PCDD/Fs after reaction were evaluated under different simulated flue gas conditions using NiO- and MnO2-loaded γ-Al2O3 and ZSM-5 catalysts. The results showed that the active metal of the catalyst affected mainly the decomposition efficiency, the substrate type affected the distribution characteristics of PCBs, and both the active metal and substrate type jointly determined the fingerprint distribution characteristics of PCBs. Moreover, there was an apparent marginal effect of the active metal loading on the same catalyst and the decomposition efficiency of the pollutants. In the temperature range of 100–350 °C, temperature variation had little effect on the removal efficiency of PCBs, but the gas–solid phase distribution characteristics of the pollutants changed significantly, and large amounts of di- and tri-CBs were generated in the products at 200 °C. A small amount of water generated hydrogen via the water–gas shift reaction at medium temperature, which promoted the hydro-dechlorination reaction of the chlorinated organics. However, excess water in the substrate gas competes with the pollutants for adsorption sites and reduces the reaction activity of the catalyst.

Silicon disulfide for high-performance Li-ion batteries and solid-state electrolytes

A layered silicon disulfide (SiS2) was synthesized on a large-scale via a solid–gas phase reaction and applied as an anode material for Li-ion batteries and solid-state electrolytes for all-solid-state batteries.

CFD modelling of copper flash smelting furnace – reaction shaft

ABSTRACT Flash smelting furnace (FSF) technology by Outokumpu is one of the most widely employed methods for copper smelting. Developing an understanding of the impact of the process parameters on smelting operation through modelling is the key to improve the smelting efficiency. Though several numerical approaches for modelling the FSF have been reported, this paper focuses on a detailed approach of computational fluid dynamics (CFD) modelling which overcomes the limitations of the earlier models by incorporating feed mineralogy and smelting reaction kinetics. The FSF based at Birla Copper, Dahej was modelled considering the reaction shaft and settler freeboard as the domain, where most of the gas-solid phase reactions occur. This model provides an exhaustive information on the FSF operation which aids in visualizing the phenomena occurring inside the furnace. A parametric study was done to validate and demonstrate the impact of various process parameters on smelting.

Gas chromatography for β-caryophyllene determination in St. John’s wort infused oil

Hypericum Perforatum L., commonly known as St. John’s wort, is one of the best-known medicinal herbs. St. John’s wort infused oils are mostly used externally, but can be taken orally for stomach ulcers, are used as a food supplement. Therefore, it is important to develop methods that allow a rapid and reliable determination of β-caryophyllene, which is one of the main active components of St. John’s wort. In this work, two gas chromatographic techniques, static headspace gas chromatography (SHS-GC) and solid phase microextraction, combined with gas chromatography-mass spectrometry (SPME-GC-MS), were examined for the determination of β-caryophyllene in St. John’s wort infused oils. A comparison of these two techniques revealed that SPME-GC-MS can be successfully applied for the analysis. The other method, SHS-GC, is simple and fast, but because of its high detection limit, it can only be applied to oil samples with β-caryophyllene concentration higher than 0.1 mg/g.

Multifunctional superelastic graphene aerogels derived from ambient-dried graphene oxide/camphene emulsions

• Graphene aerogels (GAs) were prepared by ambient drying of GO/camphene emulsions. • Pore structures of GAs were crucially determined by phase transitions of camphene. • GAs exhibited excellent mechanical/thermal properties and oil adsorption capability. Graphene oxide (GO) emulsions have been widely adopted to fabricate lightweight graphene aerogels (GAs). However, preparing high-performance GAs from conventional GO emulsions under ambient conditions seems rather challenging because of the structural collapse caused by strong capillary forces during drying. Here, we report a new, low-cost route to prepare high-performance, multifunctional GAs by the ambient drying of GO/camphene emulsions. Benefiting from the liquid–solid and solid–gas phase transitions of camphene, highly porous GO aerogels were obtained under ambient conditions. Moreover, the thermally annealed GO aerogels exhibited excellent mechanical properties, fire resistance, thermal insulation performance, and oil adsorption capability.

Boosting visible light driven gas–solid phase photocatalytic reduction of CO2 on BiOCl microspheres by enhanced carrier transportation through lattice structure modification

BiOCl powders with different amounts of thiourea addition (0, 25 mg, 50 mg, 100 mg versus 8 mmol Bi(NO3)3, denoted as BOC, BOC-S1, BOC-S2, BOC-S3) in precursor were prepared by solvothermal method. In this work, thiourea generated modification of lattice structure, stimulating shrinkable Bi-O bond rather than S element doping or composite structure forming. Shrinkable Bi-O bond generated enhanced interaction between [Bi2O2]2+ and adjacent Cl-, causing stronger inner electric field. Shorter Bi-O bond endows valence band(VB) more Cl 3p component, enhancing Cl 3p dominance. With intrinsic Bi 6p dominant conduction band, holes could be transferred to VB on Cl while electrons be transferred to CB on Bi under stronger inner electric field, performing heterojunction like efficient charge separation and transfer. Prominent promotion on CO2 photocatalytic reduction was thus achieved due to improved charge separation and transfer efficiency, where BOC-S2 reach about 5.6 times higher CH4 yield than BOC with CH4 selectivity increasing from 80.673 % (BOC) to 96.473 % (BOC-S2), certifying successful CO2 reduction ability promotion through lattice structure modulation.

Promote hydroxyl radical and key intermediates formation for deep toluene mineralization via unique electron transfer channel

The degradation and mineralization of volatile organic compounds (VOCs) in gas–solid phase photocatalytic systems suffer great challenges due to the low electron transfer efficiency and slow benzene ring-opening kinetics. Hence, a heterojunction photocatalyst of Bi2SiO5/TiO2 has been synthesized by a facile method. Bi2SiO5/TiO2 shows the ability of mineralizing toluene to CO2 with a degradation rate of 85.5%, while TiO2 is 49.0% and presents a continuous deactivation. Experimental characterizations and theoretical calculations indicate that a unique electron transfer channel of Bi/Si-O-Ti can be established in the heterojunction sample due to the coupling of the interface. The channel facilitates electron transfer to the catalyst surface, generating •OH radicals with strong oxidation and ring-opening ability. Moreover, in-situ DRIFTS reveal that the selective generation of benzoic acid on Bi2SiO5/TiO2 heterojunction plays a critical role in the ring-opening of toluene. This work discloses a novel paradigm to obtain the deep and durable photocatalytic mineralization of toluene.

Rotation induced by non-uniform gas–solid phase reactions of a non-spherical particle

• The particle rotation induced by gas–solid phase reactions is revealed; • The non-uniform gas–solid phase reaction directly results to the rotation of non-spherical particle; • The rotation characteristics of coal particle during combustion are discussed. Particle rotation plays an important role in gas–solid flow. The particle rotation induced by gas–solid phase reaction is investigated in this work. The non-uniform gas–solid phase reaction direct results to the rotation of a non-spherical particle. Based on the random distribution of active sites, the combustion of non-spherical particles is numerical investigated. According to the numerical results of chemical reaction rate on the particle surface, the net force and the rotation frequency of non-spherical particle were obtained by post-processing. The bearing force and rotation of cubic particles caused by gas–solid chemical reactions are systematically numerically studied. The rotational frequency is basically consistent with the experimental results in the reference. For coal char particles with an active area ratio of 0.8, the rotational frequency can reach 1000 Hz at side length of 60 μm. The effects of active area ratio, ambient gas temperature and particle size on the induced thrust and the rotational frequency of coal char particles are analyzed. The unbalanced force on the particle surface increase with the reaction rates. The rotation velocity increases with the decrease of particle size. And it increases with the increase of ambient temperature..

Agglomeration-influenced transformation of heavy metals in gas-solid phases during simulated sewage sludge co-incineration: Effects of phosphorus and operating temperature

Phosphorus and operating temperature not only affect the agglomeration behavior but also the transformation and migration of heavy metals. Accordingly, this study examined the effect of temperature and phosphorus in a fluidized bed combustion process to understand the emission and distribution of heavy metals by both experimental and thermodynamic calculations. The experimental results indicated that the sodium-phosphate reactions occur before the sodium-silicate reaction in the solid phase when the ratio of P/Na was 1/2. A low-melting-point sodium phosphate component, such as NaPO3, leads to easier particle agglomeration than Na2O-SiO2. In terms of the emissions of heavy metals, Pb and Cd show a similar trend: both the amount of emission smaller than that without adding phosphorus and the amount of emission share an upward trend with the operating time increased during MSS fluidized bed combustion. However, with the presence of phosphorus, the emission of Cr shows slightly decreased, and then sharply dropped, after that, increasing with operating time increased. Generally speaking, the maximum amount of Pb and Cd emitted was at 900 °C, followed by 800 °C and 700 °C. The higher temperature would promote the volatilization of Pb and Cd to emit. On the other hand, Cr emitted at the beginning tended to increase but later decreases when the temperatures were 700 and 900 °C, which may be due to the emission of Cr being influenced by the different affinities of both Al and Cr, reacting with Na in a fluidized bed incinerator. As for the distribution of heavy metals in the solid phase, a higher concentration of heavy metals was found in both the coarsest and finest particles during the process of agglomeration/defluidization.

Study on fluidization characteristics and drying characteristics of fine coal in thermal vibration separation fluidized bed

By studying the fluidization characteristics of the granular bed in the separation process of fine coal, this paper explores the effect of coal particles on the distribution and evolution of the fluidization behavior of the bed, and analyzes the separation and drying characteristics of fine coal. The results indicated that the stable value of pressure drop curve of bed with medium particles is larger than that of mixed particle bed of medium and coal. Meanwhile, with the increase of the coal particle size, the stable value of pressure drop gradually decreases, as well as the drying rate of lignite increases first and then decreases with the increase of gas velocity, vibration frequency and amplitude. Contrarily, the drying time of fine-grained coal decreases and then increase with the increase of vibration amplitude. Under the conditions of N = 1.4, f = 20 Hz, A = 2 mm, the contact efficiency between the gas–solid phases is good, and the bed pressure fluctuation is stable. After the separation of −6 + 3 mm and −3 + 1 mm fine coal, the ash content of clean coal is 13.4 % and 9.1 % respectively, and the gangue ash reached 43.7 % and 63.5 % respectively. With the increase of gas velocity, vibration frequency and amplitude, the activation energy Ea of fine coal drying process decreases first and then increases, and then the activation energy Ea in the separation process of fine coal is the lowest under the conditions of N = 1.4, f = 20 Hz, A = 2 mm.

Lattice Boltzmann Simulation of Coupling Heat Transfer between Solid and Gas Phases of Nanoporous Materials.

In order to deeply study the heat conduction of nanoporous aerogel, a model of gas-solid heat conduction was established based on the microstructure of aerogel. The model was divided into two subdomains with uniform mesh because of the different gas-solid characteristics, and simulation was performed on each domain using the lattice Boltzmann method. The value of temperature on the boundaries of subdomains was determined by interpolation. Finally, the temperature distribution and the thermal conductivity were maintained. It can be concluded that when the gas-phase scale was fixed, the temperature distribution of the solid phase became more uniform when the scale increased; when the solid-phase scale was fixed, the temperature jump on the gas-solid interface decreased with the increase in the gas-phase scale; and the thermal conductivity of gas-solid coupling varied with the scale of the gas phase or solid phase, showing a scale effect in varying degrees.

Waste utilization of sewage sludge and red mud based on chemical looping catalytic oxidation

Sewage sludge and red mud are industrial wastes that are potentially harmful to the environment. Their environmentally friendly treatment has been a global challenge due to their huge production and limited disposal capacity. Red mud, which contains Fe2O3 and Al2O3, can be used as an oxygen carrier. The organic matter contained in the sludge can be used as fuel. Based on the above characteristics, we propose a comprehensive waste reuse method: red mud was used as an oxygen carrier, sewage sludge was used as fuel and ultra-low concentration methane was used as an oxidizing gas. The method employs waste's heat and mass transfer properties to achieve comprehensive treatment and reuse of gas–solid phase waste. The factors influencing waste treatment efficiency as well as the mechanism of the reaction process have been thoroughly investigated. By adjusting the O/C ratio and water vapor percentage at 950℃, the carbon conversion and CO2 selectivity could reach 94.34 %, 76.50 %, respectively. The methane conversion was close to 99.80 %, and the H2 and CO yields were up to 37.98 × 10−4 mol and 21.67 × 10−4 mol, respectively. The microscopic morphology and properties of used OC particles remained stable. The migration characteristics of heavy metal elements indicated that bed material composed of sludge and red mud has the potential to be used as a raw material for construction after sieving. This study proposes a new comprehensive method for reusing sewage sludge, red mud, and low-concentration methane that would be efficiently recycled in one process.

In Situ Removal of Benzene as a Biomass Tar Model Compound Employing Hematite Oxygen Carrier

Tar is an unavoidable biomass gasification byproduct. Tar formation reduces gasification efficiency and limits the further application of biomass gasification technology. Hence, efficient tar removal is a major problem to be solved in the formation and application of biomass gasification technology. Chemical looping gasification (CLG), a novel and promising gasification technology has attracted extensive attention owing to its low tar generation. Active oxygen carriers (OCs), the reduced OC in CLG, are considered to be excellent catalysts for tar cracking. In this study, the use of benzene as a typical tar model compound for tar removal using the iron ore OC is investigated. In the blank experiment, where an inert material (SiO2) is used as the carrier, the benzene cracking is relatively low, and the benzene conversion, H2 yield, and carbon conversion are 53.65%, 6.33%, and 1.24%, respectively. The addition of hematite promotes benzene cracking. A large amount of oxygen-containing gases (CO and CO2) are generated. Additionally, the conversion degrees for benzene, H2 and carbon are about 67.75%, 21.55%, and 38.39%, respectively. These results indicate that hematite performs both oxidation and catalysis during benzene cracking. The extension of the residence time facilitates benzene removal, owing to the good interaction between the gas phase and solid phase. The addition of water vapor inhibits the benzene conversion and promotes the conversion of carbon deposition. The lattice oxygen reactivity of hematite OC shows an uptrend as the cycle number is increased during the benzene conversion cycle. The experimental results confirm that CLG has a low-tar advantage and that hematite is an effective OC for benzene removal.

Recovering copper ions from wastewater with chitosan to synthesize lead-free primary explosives

Chitosan (CTS) is a well-known adsorbent capable of absorbing copper ions. It's also a high-quality biomass carbon source. The carbon skeleton formed by the pyrolysis of CTS has outstanding electrical conductivity, which can help copper azide (CA), a new type of primary explosive that's particularly sensitive to electrostatic stimuli, be more electrostatically safe. The CTS-Cu complex is precipitated by using CTS to adsorb and flocculate copper ions in wastewater. To construct the Cu@carbonized chitosan (CCTS) precursor material, the organic ligands in the CTS-Cu complex are calcined into a porous three-dimensional carbon matrix, and the copper ions are transformed into copper nanoparticles embedded in CCTS. The azide reaction converts copper nanoparticles (CuNPs) into high-energy CA. With its good electrical conductivity, CCTS maintains its framework structure and effectively improves the electrostatic safety of composite energetic materials. CA@CCTS has a CA content of 69.7%, an electrostatic ignition energy (E 50 ) of about 1.19 mJ, and a heat release of 1803.22 J/g. This work takes advantage of CA and CTS's environmental friendliness. CA@CCTS, as a novel lead-free primary explosive, has good electrostatic safety while containing a high proportion of CA. • The CTS-Cu complex is precipitated by using CTS to adsorb and flocculate copper ions in wastewater. • The Cu@CCTS precursor is constructed by carbonizing the CTS-Cu complex. • The Cu@CCTS precursor is converted to CA@CCTS via a gas-solid phase azide reaction. • CA@CCTS has a CA content of 69.7%, an 50% electrostatic ignition energy (E 50 ) of about 1.19 mJ.

Black phosphorus/Bi19Br3S27 van der Waals heterojunctions ensure the supply of activated hydrogen for effective CO2 photoreduction

Photocatalytic CO2 reduction (PCC) into solar fuels has been identified as a green avenue for carbon emission reduction. The reactions are usually restricted by the competitive hydrogen production reactions so that the acquisition and utilization of activated hydrogen (H*) in photocatalytic CO2 reduction are hard to guarantee. Herein, heterojunction engineering, regarding amendatory H* supply and balancing hydrogen production reactions simultaneously, for enhancing PCC is achieved by fabricating black phosphorus (BP) nanosheets supported on Bi19Br3S27 nanorods (BP/BBS). Density functional theory calculations united with experimental researches confirm the charge transfer conforms to S-scheme mechanism, which guarantee the efficient separation of photogenerated carriers to facilitate CO2 photoreduction. Free energy analysis reveals the formation of BP/BBS heterojunction changes the active sites from BBS to BP, which decrease the rate-limiting H* formation step from 1.94 (on BBS) to 1.13 eV (BP/BBS heterojunction), ensuring the supply of activated H* for PCC. We found that the heat of the PCC is conducive to dominant protonation of CO2 not H* desorption, which can greatly improve the reduction efficiency of CO2. As a result, the optimized BP/BBS heterojunction achieves an enhanced generation rate of solar fuels in liquid or gas-solid phase system with CO generation rate of 395.7 and 35.4 μmol g−1catalyst, respectively. This work provides an efficient strategy to achieve the supply of activated H* for PCC and other photochemical process.

Three-Dimensional CFD simulation of waste plastic (SRF) gasification in a bubbling fluidized bed with detailed kinetic chemical model

The utilization of municipal solid waste combustible fractions as a fuel is generally preferred over landfilling. Fuels derived from waste materials, such as solid refuse fuel (SRF), can be utilized for energy generation using pyrolysis, gasification, and combustion. A three-dimensional computational fluid dynamics (CFD) model was developed for the simulation of SRF gasification process in a bubbling fluidized bed (BFB). The gas phase and solid phase were studied using the large eddy simulation (LES) approach and the multiple particle-in-cell (MP-PIC) method, respectively. The simulation included the chemical kinetic model of SRF drying, pyrolysis, gas–solid reactions, and homogeneous reactions. The kinetic chemistry model was expanded to reflect a higher yield of C2-C3 gases and tars evolved from SRF. The simulation results were compared with the gas composition obtained from experiments conducted on a lab-scale reactor having a capacity, height, and internal diameter of 1 kg/h, 1 m, and 0.114 m, respectively. The independence of the accuracy of the model on the mesh resolution and computational particle number was examined. Varying air-to-fuel equivalence ratio (ER) to 0.20, 0.25, and 0.30 changed syngas LHV to 25.40, 16.86, and 14.30 kJgas/gfuel respectively and changed C2-C3 hydrocarbons yield to 0.30, 0.18, and 0.16 g/gfuel respectively. Changing the SRF feed location to below the bed at ER = 0.25, increased the gas LHV to 19.85 kJgas/gfuel and increased C2-C3 hydrocarbons yield to 0.21. SRF BFB gasification reactor model can be exploited for simulation of low ER autothermal decomposition of SRF to C2-C3 hydrocarbons or high LHV gas production.

Effects of bioelectricity generation processes on methane emission and bacterial community in wetland and carbon fate analysis

Wetlands are an important carbon sink for greenhouse gases (GHGs), and embedding microbial fuel cell (MFC) into constructed wetland (CW) has become a new technology to control methane (CH4) emission. Rhizosphere anode CW–MFC was constructed by selecting rhizome-type wetland plants with strong hypoxia tolerance, which could provide photosynthetic organics as alternative fuel. Compared with non-planted system, CH4 emission flux and power output from the planted CW–MFC increased by approximately 0.48 ± 0.02 mg/(m2·h) and 1.07 W/m3, respectively. The CH4 emission flux of the CW–MFC operated under open-circuit condition was approximately 0.46 ± 0.02 mg/(m2·h) higher than that under closed-circuit condition. The results indicated that plants contributed to the CH4 emission from the CW–MFC, especially under open-circuit mode conditions. The CH4 emission from the CW–MFC was proportional to external resistance, and it increased by 0.67 ± 0.01 mg/(m2·h) when the external resistance was adjusted from 100 to 1000 Ω. High throughput sequencing further showed that there was a competitive relationship between electrogenic bacteria and methanogens. The flora abundance of electrogenic bacteria was high, while methanogens mainly consisted of Methanothrix, Methanobacterium and Methanolinea. The form and content of element C were analysed from solid phase, liquid phase and gas phase. It was found that a large amount of carbon source (TC = 254.70 mg/L) was consumed mostly through microbial migration and conversion, and carbon storage and GHGs emission accounted for 60.38% and 35.80%, respectively. In conclusion, carbon transformation in the CW–MFC can be properly regulated via competition of microorganisms driven by environmental factors, which provides a new direction and idea for the control of CH4 emission from wetlands.Graphical

TiO2 nanorods doped with g-C3N4 – Polyethylene composite coating for self-cleaning applications

Visible-light-absorbing graphitic carbon nitride–TiO2 nanorod nanomaterials (g-C3N4@TiO2NR) were successfully immobilized using a one-step UVA-induced photocatalytic procedure on commercially obtained flexible low-density polyethylene (LDPE) films. Self-cleaning properties were evaluated in solid–liquid and solid–gas phases using malachite green as a model molecule under UV-A and visible light irradiation. For comparison purpose, LDPE films containing P25 TiO2 nanoparticles was prepared using the same synthetic strategy (P25/LDPE). Among the fabricated films, the g-C3N4@TiO2NR/LDPE films exhibited the highest photocatalytic activity both in solid–liquid and solid–gas phases after 120 min of visible light irradiation (λ > 455 nm) removing efficiently malachite green stains probably due to the attack of photoinduced reactive oxygen species (ROS) such as singlet oxygen (1O2), hydroxyl radical (•OH) and superoxide anion radical (O2−•). Furthermore, the g-C3N4@TiO2NR/LDPE films retained their visible-light-photoinduced photocatalytic properties after four reuse cycles. The g-C3N4@TiO2NR/LDPE films also exhibited significant visible-light-photoinduced hydrophilicity. The high visible-light-photoinduced photocatalytic capacity of g-C3N4@TiO2NR/LDPE films was found to be related to the textural and electronic properties, superior visible-light absorption, and surface roughness of the films.