Removal Rate Of Methyl Orange Research Articles

Degradation of methyl orange by pyrite activated persulfate oxidation: mechanism, pathway and influences of water substrates.

Degradation mechanism of methyl orange (MO), a typical azo dye, with pyrite (FeS2) activated persulfate (PS) was explored. The results showed that when the initial concentration of MO was 0.1 mM, FeS2 was 1.6 g/L and PS was 1.0 mM, the removal rate of MO could reach 92.9% in 150 min, and the removal rate of total organic carbon could reach 14.1%. In addition, both pH ≤ 2 and pH ≥ 10 could have an inhibitory effect in the FeS2/PS system. Furthermore, Cl- and low concentrations of HCO-3 had little effect on the degradation of MO with FeS2/PS. However, H2PO-4 and high concentrations of HCO-3 could inhibit the degradation of MO in the system. Besides, MO in river water and tap water were not degraded in FeS2/PS system, but acidification (pH = 4) would greatly promote the degradation. In addition, the removal rate of MO with FeS2/PS could still reach about 90% after five cycles of FeS2. Furthermore, the intermediates and possible degradation pathways were speculated by LC-MS, and the degradation mechanism of MO by FeS2/PS was that the cycle of Fe(III)/Fe(II) could continuously activate persulfate to produce SO4•-. The results could provide technical support for azo dye degradation in the FeS2/PS system.

Treatment of wastewater containing methyl orange dye by fluidized three dimensional electrochemical oxidation process integrated with chemical oxidation and adsorption

The integrated high-efficiency treatment technology for dye industry wastewater is one of the current research hot topic in industrial wastewater treatment area. This article reports a new fluidized three-dimensional electrochemical treatment process integrating activated carbon adsorption, direct electro-oxidation and ·OH oxidation. In the process, activated carbon is polarized in a fluidized bed electrochemical reactor to enhance the direct electro-oxidation and ·OH oxidation, and there is a synergistic effect of effective adsorption and electrochemical oxidation to strengthen the treatment efficiency. When 200 mg/L methyl orange is processed, its removal rate reaches 99.9% in 30min, and the synergistic efficiency is 57.3%. After 8 cycles of activated carbon reusage in the process, the removal rate of methyl orange still kept at 89.2%. It is also founded that the activated carbon maintains 64.5% of its original adsorption capacity during the cycle. These results shows its interesting application potential in the fields of high-efficiency, low-cost and green treatment of various industrial organic wastewaters. Further improvements should focus on the development of continuous operation model and the improvement of the activated carbon electro-catalytic performance and the practical regeneration ways of the activated carbon particle electrodes.

Removal of methyl orange from water by Fenton oxidation of magnetic coconut-clothed biochar.

Water pollution has become a serious environmental problem to date. Advanced oxidation processes (AOP) have been widely applied in water treatments. However, the traditional Fenton reaction based on the Fe2+–H2O2 system has obvious drawbacks, limiting further practical applications. In this work, an Fe3O4 and nano-clothed biochar (Fe3O4/CBc) composite was prepared through a precipitation method and used for the degradation of methyl orange (MO) in water. The Fe3O4/CBc composite was characterized by FTIR, BET, SEM, TEM, XRD, and VSM. In addition, the adsorption/catalytic oxidation of MO were also tested. Specifically, Fe3O4/CBc had a rough surface, abundant porous structure, high surface area of 835.82 m2 g−1, and obvious magnetization. The catalyst showed rather high performance towards MO removal. The optimal conditions for MO removal were as follows: the dosage of hydrogen peroxide was 16 mmol L−1, pH = 3, the temperature was 35 °C, and the addition amount of adsorbent was 10 mg. Under optimal conditions, the MO removal rate can be higher than 99%. The synergistic effect between catalytic degradation and adsorption in removing MO was also observed. Besides high performance in removing MO, Fe3O4/CBc also exhibited high stability, easy magnetic separation, and great reusability, as well as the potential to be developed as a new heterogeneous Fenton catalyst.

ZrMOX Particles for Enhanced Removal of Methyl Orange from Wastewater: Preparation, Characterization, and Adsorption Study

The wide application of organic dyes in many industries has brought challenges to the effective treatment of organic wastewater. In this study, a series of ZrMOX (M: Fe, Co, Ni, Cu) particles were prepared by the coprecipitation method to adsorb methyl orange (MO) in aqueous solution. The adsorbents were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), and N2 adsorption-desorption. The selected adsorbent with the best adsorption performance was ZrFeOX with a molar ratio of 1 : 1 and calcination temperature of 573 K; the maximum adsorption capacity was 138.95 mg·g-1. The adsorption behavior of MO onto the adsorbent was studied as a function of contact time, initial concentrations, adsorption temperature, and pH conditions. The analysis results showed that pseudo-second-order, Elovich, and Langmuir models were suitable to describe the adsorption behavior of MO on the adsorbent. In addition, regeneration experiments presented that the MO removal rate reached over 96% after repeated recycling for 5 times. The adsorbent developed in this work is not only simple to prepare and low cost but also green and energy-saving, which can make some contributions to environmental governance.

Z-scheme 0D/3D p-Ag6Si2O7 nanoparticles-decorated n-Bi2O2CO3 micro-flowers heterojunction photocatalyst for efficient degradation of organic contaminants

Novel Z-scheme 0D/3D p-Ag6Si2O7/n-Bi2O2CO3 micro-flowers heterojunctions were fabricated by a CTAB-aided deposition and in-situ growth route for the first time. The photocatalysts were characterized systematically via XRD, XPS, SEM, BET, EDS, TEM and Mott-Schottky. Under simulated sunlight irradiation, the AB0.15 (the molar ratio of Ag6Si2O7/Bi2O2CO3 is 0.15:1) presented optimal removal rate of methyl orange (0.1064 min−1), which was 18 and 15 times that of Bi2O2CO3 and Ag6Si2O7, respectively. Simultaneously, the AB0.15 can effectively eliminate colourless ciprofloxacin from water (0.0768 min−1), which ruled out the photosensitization. The outstanding organics mineralization ability and photocatalytic stability of AB0.15 were verified by TOC and cyclic tests. As evidenced by UV–vis DRS, PL and electrochemical experiments, AB0.15 exhibited broaden light absorption and improved charge separation efficiency compared with single-phase samples. Trapping experiments and ESR electron spin test proved that h+ and •O2− were principal active species during the degradation. The performance enhancement was mainly ascribed to the synergistic action of p-n heterojunction built-in electric field and Z-scheme charge migration mode, extremely promoted the activization and separation of carriers. This study offers a new perspective for designing high-performance Z-scheme photocatalysts for sewage purification.

SuFEx modification of silk fibroin silicon aerogel and its adsorption behavior and antibacterial performance

A silk fibroin silicon-based composite aerogel (SSA) has been modified via a SuFEx reaction for application in the adsorption of anionic pollutants and antimicrobials in water. The tyrosine fragment in the silk fibroin was modified by a high yielding SuFEx click reaction. A quaternary ammonium salt functionality was introduced into the silk fibroin protein and the modified silk fibroin protein was crosslinked with tetraethyl orthosilicate. The aerogel was then prepared by freeze-drying. The aerogel obtained has biocompatibility and biodegradability properties. Four types of dyes (Methyl orange, Rhodamine B, Methylene blue and Acid red) were applied as targets and the saturated adsorption amounts were calculated. The adsorption behavior of the dyes towards SSA was studied by fitting Langmuir and Freundlich adsorption models. A pseudo-first order kinetic model and a pseudo-second order kinetic model were used to study the kinetics of the adsorption process. After 6 cycles, the removal rate of methyl orange by SSA remained at 81.25%. The adsorption capacity and anti-interference ability of SSA on some other polluting anions such as PO43− and CrO42− were also measured and the efficiency adsorption reached up to 70.94% and 77.91%, respectively. The antibacterial effect of SSA was evaluated with Escherichia coli and Staphylococcus aureus as representative examples.

Adsorption performance of chitosan Schiff base towards anionic dyes: Electrostatic interaction effects

In this paper, an electropositive adsorbent, salicylaldehyde-chitosan Schiff base (SCSB), was prepared via chitosan modification. The results showed that SCSB exhibited electrostatic adsorption on anionic dyes with a better adsorption performance than chitosan, corresponding to 24.75% and 79.80% removal rate of methyl orange (MO), respectively. Furthermore, the positive charge from the C = N was not strong enough to counter the electron-donating effect of salicylaldehyde, the MO removal rates of 0.5SCSB, 1.0SCSB, and 1.5SCSB were 79.80%, 69.02% and 59.60%, respectively. In the pH test, the imine group (C = N) hydrolysis showed a greater impact on charges changing than the amino group (–NH2) hydrolysis.

Zn/S-modified Cu2O nanoparticles for applications in photocatalysis

A Zn/S Co-doped Cu2O composite photocatalyst with excellent performance is reported. Zn-Cu2O/S composite was prepared by simple hydrothermal synthesis and impregnation method. XRD, SEM and EDS analysis showed that Cu9S5 and ZnO were formed after Zn/S Co-doping, and p-n heterojunction was formed. Zn-Cu2O/S has good visible light sensing performance, rapid carrier transport, higher photocurrent density and 100% removal rate of methyl orange. The new ternary composite Zn-Cu2O/S has potential application value in the treatment of toxic dye wastewater.

Alkali Lignin from Rice (Oryza sativa L.) Husk as Adsorbent for Aqueous Methyl Orange and Bromothymol Blue: Analysis of the Adsorption Kinetics and Mechanism

In this study, lignin was isolated from rice (Oryza sativa L.) husk using alkaline extraction method and was used as an adsorbent for aqueous solutions of methyl orange (MO) and bromothymol blue (BTB). The equilibrium removal rate of MO was found to be at 61.4%, with experimental equilibrium adsorbate uptake, qe, of 1.23 mg·g-1, achieved at 150 minutes contact time. For BTB, the equilibrium removal rate was found to be at 78.3%, with an experimental qe of 1.57 mg·g-1, achieved at 150 minutes contact time. Pseudo-first order (PFO) and pseudo-second order (PSO) kinetic models were then used to investigate the kinetics of the adsorption process. Both MO and BTB on lignin were found to follow a PSO kinetic model, with rates of 6.84 x 10-3 g·mg-1·min-1 and 0.69 g·mg-1·min-1, respectively. Langmuir, Freundlich, Dubinin-Radushkevich (DR), Brunauer-Emmett-Teller (BET), Flory Huggins (FH), and Temkin adsorption isotherm models were then used to determine the appropriate equilibrium adsorption model for both substrates. Based on the calculations performed, the Temkin model best described the adsorptive removal of both MO and BTB. Based on the Temkin model, the adsorption processes of both MO and BTB were found to occur spontaneously, with equilibrium rate constants of 0.083 L·mg-1 and 0.012 L·mg-1, respectively.

Effective removal of Cr(VI) and methyl orange from the aqueous environment using two-dimensional (2D) Ti3C2Tx MXene nanosheets

Industrial use of heavy metals and dyes critically depends on the effective handling of industrial effluents. Effective remediation of industrial effluents using various adsorbent materials has thus become critical. In this paper, we study two-dimensional MXenes as an adsorbent for removing Cr(VI) and methyl orange (MO) in waters. The physico-chemical performance of MXenes was studied using X-ray diffraction, Fourier transform infrared spectroscopy, Brunauer−Emmett−Teller, scanning electron microscopy, high resolution-transmission electron microscopy, thermogravimetric analysis, and X-ray photoelectron spectroscopy techniques. The adsorption system, including influence of contact time, pH of solutions, co-ions, and desorption experiments were performed for effective Cr(VI) and MO removal. The Cr(VI) and MO removal rate of the MXenes was very fast, and the kinetic system was driven by pseudo-second-order kinetics. The sorption isotherm closely well-tailored with the Langmuir isotherm, and the maximum removal efficiencies were 104 and 94.8 mg/g for Cr(VI) and MO, respectively. The MXenes was successfully regenerated by 0.1 M NaOH aqueous solution and can be repeatedly recycled. The uptake of Cr(VI) and MO by the MXenes was mainly due to chemical adsorption, namely electrostatic adsorption, complexation, surface interactions, and ion exchange mechanisms. This investigation demonstrates the selectivity and feasibility of the MXenes as a real adsorbent for eliminating Cr(VI) and MO from the aqueous environment.

Depositing Ag2S quantum dots as electron mediators in SnS2/g-C3N4 nanosheet composites for constructing Z-scheme heterojunction with enhanced photocatalytic performance

The novel Z-scheme heterojunction photocatalyst g-C3N4/Ag2S/SnS2 with Ag2S quantum dots as electron mediators was successfully synthesized by in-situ ion exchange reaction and self-peeling of g-C3N4. Compared with g-C3N4, SnS2 or g-C3N4/SnS2, the photocatalyst g-C3N4/Ag2S/SnS2 exhibited more excellent photocatalytic performance under visible light irradiation. The removal rate of methyl orange was 96.8% after 30 minutes visible light irradiation and the reaction rate constant reached 0.10225 min-1. The enhanced photocatalytic activity could be attributed to the formation of Z-scheme heterojunction structure and the 2D layered structure. The electrochemical and photoelectric performance tests showed that the separation and transfer efficiency of the photogenic electron-hole pairs as well as the redox potential were significantly improved. Additionally, the quenching experiments showed that the superoxide radicals and holes were the primarily active species. Combined with other characterizations, the reaction mechanism of the g-C3N4/Ag2S/SnS2 for degrading the target pollutant methyl orange under visible light irradiation was proposed.

Acid etching followed by hydrothermal preparation of nanosized Bi2O4/Bi2O3 p-n junction as highly efficient visible-light photocatalyst for organic pollutants removal

As a promising visible-light photocatalyst, Bi2O4 has the advantage of broadband spectral response range. However, the high recombination rate of photoexcited charge carriers induced by the submicrorod morphology of pure Bi2O4 greatly restricts its visible-light photocatalytic performance. Herein, a novel nanosized Bi2O4/Bi2O3 p-n junction was developed by a dilute HCl acid etching and subsequent hydrothermal method, using NaBiO3·2H2O as the sole bismuth precursor. A product of NaBiO3·2H2O@BiOCl was formed firstly when NaBiO3·2H2O was partially reduced by insufficient dilute HCl aqueous solution. Then, BiOCl reacted with NaBiO3·2H2O during the following hydrothermal reaction process, resulting in the formation of Bi2O4 nanoparticles (NPs) anchored on the surface of plate-like Bi2O3. The content of Bi2O3 in the junction can be easily controlled by changing the added amount of dilute HCl acid. This strategy could not only realize the NPs-sized Bi2O4 but also construct nanometered Bi2O4/Bi2O3 p-n junction simultaneously, which remarkably improves the separation efficiency of charge carriers. Furthermore, the obtained Bi2O4/Bi2O3 heterojunctions have larger specific surface areas than Bi2O4 alone. Due to these advantages, the photocatalytic removal rate of methyl orange (MO) and phenol for the optimal Bi2O4/Bi2O3 heterostructure increased respectively by 5.06 and 2.16 times under visible light, when compared with single Bi2O4. The results of active species trapping experiment and electron spin resonance (ESR) spectra indicate that holes (h+) and superoxide radicals (O2−) are the primary and secondary reactive active species during the photocatalytic degradation process, respectively. This work provides a novel perspective for the design and preparation of high performance Bi2O4-based photocatalyst.

Preparation of novel carbon spheres based on molecular design and adsorption/degradation of methyl orange

Novel carbon spheres (GAC-GAC-nZVI) were designed and prepared based on the Kirkendall effect. Granular activated carbon sphere (GAC) was prepared by suspension polymerization, and fabricated into an iron-carbon composite (nZVI-GAC) which was then coated with a carbon shell on the surface (GAC-nZVI-GAC). GAC-GAC-nZVI was prepared using air calcination as the driving force. After GAC-GAC-nZVI treatment of methyl orange (MO) solution, the appearance of sulfamic acid (SA) showed that GAC-GAC-nZVI doubled the role of adsorption and degradation in the process of removing MO. At the same time, compared with GAC(specific surface areas (SBET): 900.257 m2/g, pore volume (Vtot): 0.447902 cc/g) as well as GAC that was coated with a carbon shell (GAC-GAC) (SBET: 715.102 m2/g, Vtot: 0.387417 cc/g), the good characterization of GAC-GAC-nZVI (SBET: 1347.287 m2/g, Vtot: 0.735180 cc/g) results and the high removal rate of MO(99.2% within 100 mins) prove the significance of the work.

Optimized design and mechanistic understanding of plasmon and upconversion enhanced broadband photocatalysts

Abstract A series of core@shell particles composed of upconverting NaYF4: Yb3+/Er3+/Tm3+ cores with different Tm3+:Er3+ molar ratios and porous TiO2 shells loaded with Au nanoparticles (NPs) (altogether denoted as NYF@TiO2-Au) were designed and synthesized. The emissions upconverted from near-infrared (NIR) to ultraviolet (UV), blue and green regions were tuned by varying the doping ratio of Tm3+:Er3+ in NYF. The quenching of UV emissions in samples involving TiO2 and the quenching of green emissions with Au loading suggest the energy transfer from NYF to TiO2 and to Au NPs, respectively. In the photocatalytic degradation of methyl orange (MO), all the prepared NYF@TiO2-Au samples show greatly enhanced photocatalytic activities under UV, visible, and NIR irradiation. In terms of NIR-photocatalytic activity, the optimized doping ratio of Tm3+:Er3+ was found to be 6:0, leading to the highest MO removal rate of 84% within 20 h of NIR irradiation. The contribution of NYF-to-TiO2 energy transfer was about 3 times higher than that of NYF-to-Au energy transfer in the NIR-photocatalysis, which was confirmed by the performed control experiments. This work provides guidelines for the rational design of efficient broadband photocatalysts involving upconversion materials, and offers physical insights into the energy transfer processes in plasmon and upconversion enhanced photocatalysis.

Removal of organic dye by biomass-based iron carbide composite with an improved stability and efficiency.

The efficiency of zero-valent iron (Fe0) for the degradation of contaminants in water or soil can be highly reduced by side reactions with oxygen or water. This work was conducted to test whether this drawback can be effectively suppressed by the carbonation of Fe0 with pyrolyzed biomass, which forms a Fe3C composite. The composite Fe3C was characterized and its reactivity and stability were assessed in batch tests with methyl orange (MO) as a model pollutant. The results indicated that the removal rate of MO on Fe3C composite was higher than that of Fe0 (7.587 mg/(g·min) vs. 4.306 mg/(g·min)) at pH 4, where the degradation mechanism was confirmed by high-performance liquid chromatography-mass spectrometry. More importantly, the produced iron oxide in the Fe3C composite was highly suppressed. Regeneration studies showed that after three times of cycling, the removal efficiency of MO on Fe3C composite was kept to 99.42%, but Fe0 almost lost its reactivity. In situ chemical reduction of a colorimetric redox probe (indigo-5, 5'-disulfonate, I2S) quantitatively demonstrated that Fe3C composite has the reduction kinetics of I2S obviously slower than Fe0, indicating that Fe3C composite improved the stability of incorporated Fe0 to resist the side oxidation.

Design of graphitic carbon nitride supported Ag–Cu2O composites with hierarchical structures for enhanced photocatalytic properties

A novel ternary photocatalytic nanocomposite, Ag–Cu2O/C3N4, has been successfully synthesized via a facile two-step reduction procedure at room temperature, wherein Ag nanoparticles are directly growing on the surface of Cu2O supported by C3N4 nanosheets. The resulting ternary Ag–Cu2O/C3N4 photocatalyst exhibits enhanced photocatalytic activity towards methyl orange (MO) degradation compared with its counterparts (Cu2O, spherical Ag–Cu2O and Cu2O/C3N4), demonstrating a removal rate of MO up to 95.7% within 30 min. The enhanced photocatalytic activity can be ascribed to the following factors: (1) the surface plasmon resonance effect of Ag nanoparticles broadening the visible light response of Cu2O; (2) the introduction of C3N4 functioning not only as a fast electron delivery but also a fine stabilizer to prevent the Ag–Cu2O composite from agglomeration. Mechanism studies reveal that MO is cracked into smaller fragments and the h+ is the main reactive species participating in the photocatalytic process. Moreover, the Ag–Cu2O/C3N4 photocatalyst also shows high photodegradation ability for another two representative azo dyes, acid orange II and congo red. This study demonstrates the potential of Ag–Cu2O/C3N4 in the degradation of azo dyes and also provides a guide to design of Cu2O-based ternary photocatalysts for further wastewater remediation.

Facile preparation of binder-free NiO/MnO2-carbon felt anode to enhance electricity generation and dye wastewater degradation performances of microbial fuel cell

Binder-free NiO/MnO2-carbon felt electrode is prepared with a facile two-step hydrothermal method. The NiO self-grown on the carbon felt is used as the skeleton structure to support the in-situ growth of MnO2. Both the core and shell materials are excellent pseudocapacitance materials. The compositing of such pseudocapacitance metal oxides can produce synergistic effects, so that the modified electrode has a high capacitance. NiO/MnO2-carbon felt electrode also possesses a high specific surface area, super hydrophilicity and good biocompatibility, which are conducive to the enrichment of typical exoelectrogen Geobacter. As the anode, NiO/MnO2-carbon felt electrode can effectively improve the electricity generation and methyl orange (MO) wastewater degradation performances of microbial fuel cell (MFC). The highest output voltage and the maximum power density of MFC with NiO/MnO2-carbon felt anode are respectively 652 mV and 628 mW m−2, which are much higher than those of MFC with MnO2-carbon felt anode (613 mV, 544 mW m−2), NiO-carbon felt anode (504 mV, 197 mW m−2) and unmodified carbon felt anode (423 mV, 162 mW m−2). The decolourization efficiency and the chemical oxygen demand (COD) removal rate of MO for MFC with NiO/MnO2-carbon felt anode are respectively 92.5% and 58.2% at 48 h.

Removal of Methyl Orange from Water Using Sulfur-Modified nZVI Supported on Biochar Composite

A biochar-supported FeS/nZVI hybrid material (S-nZVI/BC) was synthesized and used for methyl orange (MO) removal from aqueous solutions. The effects of the S/Fe ratio, initial pH, MO concentrations, contact time, and coexisting ions were investigated. S-nZVI/BC was characterized by X-ray diffraction, transmission electron microscopy, vibrating sample magnetometer, BET surface areas, and X-ray photoelectron spectroscopy. A 1.44-fold increase in MO removal rate (from 36.84 to 53.13%) was observed as the S/Fe molar ratio increased from 0 to 0.5. The removal of MO was highly pH-dependent and the adsorption kinetics data were in agreement with the pseudo-second-order model. The maximum removal rate of MO (0.5 mM) was 76.09% (1.902 ± 0.229 mmol/g) for S-nZVI/BC at pH 2.5. The presence of Cl−, Ca2+, NH4+, and humic acid exerted an inhibitory effect on MO removal, both at low and high concentrations. These results indicate that the sulfidation process would improve the wastewater treatment efficiency. Another benefit is that S-nZVI/BC could be removed from the solution easily by an external magnetic field.

NiO/C3N4: hybrid photocatalyst for the enhanced photodegradation of organic pollutant under visible light

Photocatalysis utilizing semiconductor oxides is being researched widely for the degradation of dyes. This examination depicts the visible light actuated photocatalytic degradation of azo dye, methyl orange, utilizing NiO/C3N4 hybrid photocatalyst. The NiO/C3N4 hybrid photocatalyst with differing weight percentage were effectively synthesized by a simple calcinations method. The synthesized materials were described using x-ray diffraction, Fourier-transform infrared spectroscopy, Scanning electron microscopy-Electron dispersive spectroscopy, High resolution transmission spectroscopy, UV–vis diffuse reflectance spectroscopy, Atomic absorption spectroscopy and Photoluminescence. The photocatalytic action of NiO/C3N4 hybrid photocatalyst was assessed by the removal of methyl orange under visible light illumination (>400 nm). The loading of NiO on C3N4 was confirmed by AAS analysis. It is discovered that 4 wt% of NiO loaded C3N4 photocatalyst demonstrated maximum photocatalytic action and its comparing removal rate of methyl orange is accomplished 50% higher than that of bare g-C3N4 photocatalyst. Moreover, 78% of total organic carbon (TOC) removal was obtained with 4 wt% of NiO/C3N4 hybrid photocatalyst in 50 min.

A novel zein/poly (propylene carbonate)/nano-TiO2 composite films with enhanced photocatalytic and antibacterial activity

Abstract Composite films were prepared by extrusion technology using zein, poly propylene carbonate (PPC) and nano-TiO2. The samples were characterized by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), fourier transform infrared spectroscopy (FTIR) and mechanical properties experiments. Based on the Halsey equation, the relationship between tensile strength and relative humidity is established to predict the tensibility of the composite films under different humidity conditions. The SEM study revealed that zein and PPC could form a homogeneous network structure and uniform distribution of nano-TiO2 in films. Furthermore, the composite films presented a good thermal stability. The structural analysis showed that ester groups were major forces responsible for complex formation. In addition, the photocatalytic degradation of methyl orange (MO) followed pseudo first-order kinetics was also investigated, and the removal rate of MO could achieve up to 85.06%. The antibacterial experiment indicated that zein/PPC/nano-TiO2 film had good activity against the E. coli, S. aureus and salmonella. The obtained results indicated the designed film may be a potential alternative for food packaging.