Acid Orange II Research Articles

Predicted kinetic behaviour of the oxidative degradation of organic pollutant using substituted MeCuFeO3 (Me = Ca, Sr, CaSr) perovskite catalysts

The substitution of different types of A-site metal cations within the perovskite structure leads to a change in the catalytic activity of the resultant catalyst, which subsequently affects the overall kinetic behaviour of the degradation of organic pollutants. Hence, understanding the kinetics behaviour of the substituted perovskite catalysis is crucial for determining the reaction rates of the degradation process. This study investigates the catalytic performance and kinetic analysis of substituted MeCuFeO3 (Me = Ca, Sr, CaSr) perovskite catalysts in the oxidation of organic pollutants, namely acid orange II (AOII) dye. The highest AOII degradation was achieved by CaCuFeO3 (97 %) followed by CaSrCuFeO3 (95 %) and SrCuFeO3 (91 %) within 60 min of reaction in the presence of oxidant (H2O2). Interestingly, the AOII oxidation by CaCuFeO3 followed a pseudo-second-order kinetic model while SrCuFeO3 and CaSrCuFeO3 were fitted to the BMG kinetic model. The reaction rate constant of CaCuFeO3 (k = 1.9 × 10−2 L.mg−1.min−1) was higher by a magnitude of two and three than that of CaSrCuFeO3 (k = 9.4 × 10−3 L.mg−1.min−1) and SrCuFeO3 (k = 6.3 × 10−3 L.mg−1.min−1), respectively. These results indicate that the partial substitution of Sr in the A-site of CaCuFeO3 leads to a slight deterioration in the overall catalytic performance of the oxidative degradation of AOII, which contributes to a change in the behaviour of the reaction kinetic models.

Synthesis of β-FeOOH/polyaniline heterogeneous catalyst for efficient photo-Fenton degradation of AOII dye.

Discharge of the untreated dye-containing wastewaters will induce water source pollution and further harm aquatic organisms. In this study, the akaganéite/polyaniline catalyst (β-FeOOH/PANI, about 1.0μm) could be successfully composed by polyaniline (PANI, (C6H7N)n, 200-300nm) and akaganéite (β-FeOOH, FeO(OH)1-xClx, less than 200nm), according to the identification and characterization results of XRD, Ramon, FTIR, XPS, SEAD, EDS, and FESEM (or HRTEM). Due to PANI providing more photogenerated electrons, the β-FeOOH/PANI composite (compared with β-FeOOH) in photo-Fenton system had the more highly catalytic degradation capacity to Acid Orange II (AOII) under an optimal condition (7.5mmol/L of H2O2 oxidant, 40mg/L of AOII, 0.2g/L of catalyst dosage, and pH 4.0). The AOII degradation kinetics could be well fitted by pseudo-first-order model. In photo-Fenton catalytic process of AOII dye, the ∙OH and h+ were the main reaction substances. The AOII in solutions could be gradually mineralized into non-toxic inorganic H2O molecule and CO2. The β-FeOOH/PANI catalyst also had a good reusable ability of about 91.4% AOII degradation after 4 runs. These results can provide a reference for synthesis of catalyst used in photo-Fenton system and the applications in degradation removal of organic dye from wastewaters.

Functional role of B-site substitution on the reactivity of CaMFeO3 (M = Cu, Mo, Co) perovskite catalysts in heterogeneous Fenton-like degradation of organic pollutant

BackgroundSubstitution of different types of B-site metal cations in the perovskite structure led to a significant change in the catalytic reactivity of the resulting catalysts. In this work, the functional role of B-site substitution on the catalytic reactivity of mixed oxides containing B-site substituted CaMFeO3 (M = Cu, Mo and Co) perovskite catalysts is investigated. MethodsThe catalysts were synthesized via a modified EDTA-citric acid complexation method and tested for the heterogeneous Fenton-like reaction for oxidative degradation of acid orange II (AOII) dye in the presence of H2O2. Significant findingsCaCuFeO3 exhibited the highest AOII degradation (97%) followed by CaMoFeO3 (90%), CaFeO3 (64%) and CaCoFeO3 (40%) within 60 min of reaction, and the reaction followed a pseudo-second-order kinetics model. Interestingly, the partial substitution of Cu in the B-site of CaFeO3 enhanced the reaction rate constant achieving a k value of 1.9 × 10−2 L mg−1 min−1, approximately twenty-one times higher than that of the blank catalyst CaFeO3. The enhanced catalytic reactivity of CaCuFeO3 is associated with the high reducibility of copper/iron ions within the B-site structure in the presence of oxidant which facilitated fast redox cycling of the active sites during catalysis. The fast redox cycling is attributed to the decent electron mobility due to low electron transfer resistance between the active sites.

Enhancing acid orange II degradation in ozonation processes with CaFe2O4 nanoparticles as a heterogeneous catalyst.

This study used CaFe2O4 nanoparticles as a catalyst for ozonation processes to degrade Acid Orange II (AOII) in aqueous solution. The study compared heterogeneous catalytic ozonation (CaFe2O4/O3) with ozone treatment alone (O3) at different pH values (3-11), catalyst dosages (0.25-2.0 g L-1), and initial AOII concentrations (100-500 mg L-1). The O3 alone and CaFe2O4/O3 systems nearly completely removed AOII's color. In the first 5 min, O3 alone had a color removal efficiency of 75.66%, rising to 92% in 10 min, whereas the CaFe2O4/O3 system had 81.49%, 94%, and 98% after 5, 10, and 20 min, respectively. The O3 and CaFe2O4/O3 systems degrade TOC most efficiently at pH 9 and better with 1.0 g per L CaFe2O4. TOC removal effectiveness reduced from 85% to 62% when the initial AOII concentration increased from 100 to 500 mg L-1. The study of degradation kinetics reveals a pseudo-first-order reaction mechanism significantly as the solution pH increased from 3 to 9. Compared to the O3 alone system, the CaFe2O4/O3 system has higher k values. At pH 9, the k value for the CaFe2O4/O3 system is 1.83 times higher than that of the O3 alone system. Moreover, increasing AOII concentration from 100 mg L-1 to 500 mg L-1 subsequently caused a decline in the k values. The experimental data match pseudo-first-order kinetics, as shown by R2 values of 0.95-0.99. AOII degradation involves absorption, ozone activation, and reactive species production based on the existence of CaO and FeO in the CaFe2O4 nanocatalyst. This catalyst can be effectively recycled multiple times.

Polyaniline/FeOOH composite for removal of Acid Orange II from aqueous solutions

The synthesized polyaniline/FeOOH composite characterized by SEM, HRTEM, XRD, FT-IR and BET, was used as adsorbent for Acid Orange II (AOII). The kinetics, isotherm and thermodynamics of AOII adsorption by polyaniline/FeOOH were studied by batch experiments. And effects of pH and coexisting ions on AOII removals were also investigated. Adsorption kinetics and isotherm well fitted pseudo second-order kinetic model and Langmuir isotherm model, respectively. The maximum adsorption capacity of polyaniline/FeOOH for AOII could reach 155.8 mg g−1. It showed that polyaniline/FeOOH composite could rapidly and efficiently remove AOII from aqueous solutions. In addition, thermodynamic result indicated that the adsorption was a spontaneous endothermic process. Removal ratio of AOII (100 mg/L) increased as pH decreased and could reach 98.6% at pH3. And anions coexisting in the solutions could inhibit the adsorption effect, while the cations have negligible influence. Also, PANI/FeOOH had better applicability to the different types of anionic dyes. The regeneration of polyaniline/FeOOH loading 98.6% of AOII evaluated for three cycles and there was about 70% of AOII loaded on final adsorbent.

Degradation mechanism of acid orange II in persulfate/Fe-based metallic glass system

Fe-based metallic glasses (MGs) not only are an industrially produced amorphous zero-valent iron (AZVI) with a promising reductive degradability to azo dyes but also can activate persulfate (PS) with sulfate radicals (SO4•-, Eo = 2.5–3.1V) for wastewater remediation. In this study, acid orange II (AOII) was rapidly and efficiently decolored by Fe78Si8B14 MG/PS system with a 99% degradation rate in 8 min. Based on monitoring the degradation rate and the concentration of Fe2+/Fe3+, a two-step degradation mechanism is proposed, that one is deductive degradation by AZVI with products of small organic molecules and Fe2+, and the other is oxidative degradation, where AZVI and Fe2+ activate PS with products of SO4•- and •OH confirmed by the electron spin resonance (ESR) analysis test. The orthogonal experimental design proves that the effects of the experiment operating parameters on the decolorization efficiency from high to low are Fe-based MGs dosage, PS dosage, and reaction temperature. Meanwhile, the high efficiency of the Fe-based MGs/PS system is also illustrated for the mineralization of AOII by an indication of the TOC removal rate as high as 57%. This work gives new insight into Fe-based MGs for activating PS and will accelerate the application of Fe-based MGs as catalysts in the field of wastewater treatment.

MOFs derived Co/Cu bimetallic nanoparticles embedded in graphitized carbon nanocubes as efficient Fenton catalysts

In this work, Cu-Co bimetallic nanoparticles embedded carbon nanocubes (CuxCo10-x/CNC) are synthesized by direct carbonization of Cu-Co bimetal ZIF. The ratio of Cu and Co nanoparticles in CuxCo10-x/CNC as well as morphology, pore structure and graphitization degree of carbon substrates can be tuned by adjusting the molar ratio of Cu/Co (0:10, 1:9, 2:8, 3:7, 4:6 and 5:5) in ZIF precursors. The Fenton catalytic performances of CuxCo10-x/CNC are further studied by degrading a typical azo dye, Acid Orange II (AOII). The results show the CuxCo10-x/CNC with a Cu/Co ratio of 4/6 display the highest catalytic activity with faster dye degradation rate than other catalysts, which may be ascribed to the synergetic effects of optimized ratio of Cu/Co bimetals, high surface area and graphitized carbon framework. The stability and reusability of the catalyst has been investigated, showing a good performance after five consecutive runs. The catalysts prepared in this study can be used as an attractive alternative in heterogeneous Fenton chemistry and wastewater treatment.

Chlorhexidine-grafted coating to improve antibacterial property of the micro/nanoporous titanium surfaces

Objective: To investigate the antibacterial properties and the osteoblast-compatibility of chlorhexidine (CHX)-modified porous titanium. Methods: Smooth pure titanium specimen with diameter of 10.0 mm and thickness of 1.5 mm treated with alkali heat method were set as control group. Those with covalent conjugation of aminosilane were set as silane group, and those with CHX grafted by glutaraldehyde were set as CHX group. Scanning electron microscope (SEM) was used to observe the surface morphology and element compositions were detected by X-ray photoelectron spectroscopy. Hydrophilicity was analyzed by surface water contact angle test (n=6), while surface amino/imine groups quantification were performed through acid orangeⅡ(n=5) and the CHX was quantified by optical densitometric method (n=5). Live/dead bacterial staining, the morphology of adherent bacteria by SEM, plate counting method and inhibition zone method were executed to evaluate the antibacterial property of the samples. Osteoblast compatibility was evaluated by methyl thiazolyl tetrazolium. Cell-bacterial co-culture was conducted to evaluated the cell viability on the samples under the circumstance with bacteria. Results: After CHX grafting, pores on the titanium surface were decreased, while the atom ratio of C, N, Cl increased and the water contact angle decreased to 37.5°±4.0°. The density of CHX on the surface was (5.07±0.39) μg/cm(2). The results of live/dead bacterial staining and the morphology of adherent bacteria showed that only little dead bacterial (bacterial wall rupture) adherent on the surface of CHX group, which proved that the modified surface could inhibit bacteria adhesion and even destroyed bacteria; the plate counting displayed sporadic colonies and a transparent inhibition zone could be observed, which demonstrated that CHX group could suppress bacteria multiplication from surrounding environment. When incubating for 1 and 3 days, the cell viability of CHX group showed no significant difference from that of control group (P>0.05) ; when incubating for 5 days, the value of cell viability of CHX group was 0.547±0.087, and this was significantly lower than that of the control group (0.751±0.056) (P<0.05), demonstrating a slight inhibition of cell proliferation by CHX. The results of bacteria-cell co-culture for 3 days showed that a mass of bacteria adhered on the surface of the control group while considerable cells adhered on the surface of CHX group and exhibited a good shape. Conclusions: Porous titanium surface grafted by CHX showed an excellent antibacterial properties and allowed cell adhesion in bacterial circumstance, providing immediate implantation options for patients with bad oral health.

Regulate the crystal and optoelectronic properties of Bi2WO6 nanosheet crystals by Sm3+ doping for superior visible-light-driven photocatalytic performance

A series of novel Sm3+/Bi2WO6 nanosheets were successfully fabricated by a facile hydrothermal route. A number of physical chemistry characterizations and photocatalytic performance test showed that the doping of Sm3+ ions into Bi2WO6 caused the lattice contraction of Bi2WO6 crystal, which brought about the enhancement of specific surface area and surface OH groups. Moreover, Sm3+doping strengthened visible light absorption associated with oxygen vacancies. At the same time, oxygen vacancies generated by the substitution of Bi3+ with Sm3+ acted as the positive charge centers to trap the electrons, and consequently increased the life of photogenerated charge carriers. The obtained Sm3+/Bi2WO6 nanosheets were used to degrade different azo dyes, e.g. rhodamine B (RhB), methylene blue (MB), methylorange (MO) and acid orange II (AOII). Sm3+(4at%)/Bi2WO6 sample showed the highest degradation activity, ~3 times of pristine Bi2WO6 with the degradation rate order of AOⅡ ~ RhB > MB > MO. 100% AOⅡ and RhB can be degraded within 40 min visible light irradiation. Electron spin resonance and active species quenching experiments confirmed that superoxide radicals (O2–) and h+ were the major radicals for dyes degradation in this Sm3+/Bi2WO6 system.

Activated persulfate by DBD plasma and activated carbon for the degradation of acid orange II

In this study, the effect of activated peroxydisulfate (PDS) by dielectric barrier discharge (DBD) plasma and activated carbon (HGAC) on the removal of acid orange II (AOII) was investigated. The effects of applied voltage, PDS dosage, HGAC dosage, initial pH value, and inorganic anions on the removal rate of AOII were discussed. The main free radicals degrading azo dyes during the experiment were also studied. Experimental results show that the removal rate of AOII in DBD/HGAC/PDS synergistic system is much higher than that in the single system. With the applied voltage of 16 kV, HGAC dosage of 1 g l−1, PDS and AOII molar ratio of 200:1, initial pH value of 5.4 and concentration of AOII solution of 20 mg l−1, the removal rate of AOII reached 97.6% in DBD/HGAC/PDS process after 28 min of reaction. Acidic and neutral conditions are beneficial for AOII removal. Sulfate and hydroxyl radicals play an important role in the removal of AOII. Inorganic anions are not conducive to the removal of AOII.

Heterogeneous fenton-like reaction using Fe3-xMnxO4-MKSF composite catalyst for degradation of acid orange II dye

The selection of a good catalyst support is crucial in contributing towards the enhancement catalytic activity of a catalyst. Therefore, in this study, the influence of montmorillonite KSF (MKSF) clay loading in relation with catalytic performance of the resultant composite catalyst has been investigated. The MKSF clay loading were varied at x = 20, 40, 60 and 80 wt%, respectively. Interestingly, Fe3-0.3Mn0.3O4-MKSF(40wt%) has shown greater catalytic performance up to 98% of acid orange II (AOII) dye removal in comparison to the Fe3-0.3Mn0.3O4 and Fe3O4 catalysts. The AOII degradation kinetic using Fe3-0.3Mn0.3O4-MKSF(40wt%) was fitted well with first-order reaction kinetic and the reaction rate increased in the order of Fe3O4>Fe3-0.3Mn0.3O4>Fe3-0.3Mn0.3O4-MKSF(40wt%). It also demonstrated in the work that Fe3-0.3Mn0.3O4-MKSF(40wt%) catalyst can be reused several times without affecting its efficiency. Thus, it can be suggested that MKSF clay as catalyst support played a significant role in enhancing the overall catalytic performance of Fe3-0.3Mn0.3O4 catalyst during the heterogeneous Fenton-line reaction as well as the degradation kinetics of the AOII solutions.

Optimization of Acid Orange II Degradation using Fe3-xMnxO4 Catalyst in UV assisted Fenton-like reaction

In this work, detailed investigation on the optimization of acid orange II (AOII) degradation using Fe3-xMnxO4 catalyst in UV assisted Fenton-like reaction was performed. The Central Composite Design (CCD) based on Response Surface Methodology (RSM) with four independent operational parameters (catalyst dosage, oxidant concentration, pH and UV irradiation) and one response (percentage of AOII removal) was applied for statistical and optimization analysis. The maximum AOII removal (~100%) was found at optimal conditions of 0.4 g/L catalyst dosage, 35 mM oxidant concentration, pH 2.6 and 3 x 9W UVC. Interestingly, validation of these optimal conditions was confirmed by the experimental findings of having less than 2% absolute deviation. Such findings confer that the derived empirical quadratic model was in good agreement with the experimental findings.

Ultrafast and efficient removal of anionic dyes from wastewater by polyethyleneimine-modified silica nanoparticles

Trace anionic dyes in wastewater are difficult to be rapidly and efficiently removed because they are completely soluble and poorly biodegradable. Herein, a facile and environmentally friendly adsorbent was fabricated via the surface functioned SiO2 with abundant amine groups of polyethyleneimine (PEI). The structural characterization indicated that PEI was successfully immobilized on the SiO2 surface. The adsorption performance of SiO2-PEI was evaluated using acid orange II (AOII) as model pollutant. The adsorption of AOII on SiO2-PEI displayed high removal rates in the pH range of 2.0–9.0, and exhibited ultrafast removal (99.1% removal rate at 10 min). The adsorption behavior fitted well with the Langmuir isotherm and pseudo-second-order kinetic model, and the maximum uptake capability of AOII was higher than 705.3 mg/g. The excellent adsorption capacity of AOII on SiO2-PEI mainly relied on the electrostatic attraction between the sulfonic acid group of AOII and amine group of PEI in the adsorption process. Additionally, other anionic dyes like acid fuchsin and direct sky blue 5B could also be fast and efficiently removed by SiO2-PEI. This work is expected to open new possibilities for the ultrafast removal of anionic dye pollutants.

Dual electrochemical catalysis of Bi2Mo3O12/Ti cathode for hydrogen peroxide production in electro-Fenton system

In electro-Fenton (EF) technique, the yield of H2O2 is one of important factors affecting the wastewater treatment efficiency, which greatly depends on the cathode material. Recently the metal oxide modified cathode has become one of the most efficient materials for oxygen reduction and H2O2 production. In this paper, a bismuth molybdate with distorted scheelite structure, Bi2Mo3O12, was synthesized and used as cathode to catalyze H2O2 production. The prepared Bi2Mo3O12 was characterized by SEM, FTIR and XPS. The study on voltammetric behavior of Bi2(MoO4)3/Ti cathode found that Bi2Mo3O12 had a dual electrochemical catalysis for H2O2 production, and that was further verified by the high yield of H2O2 for short time in bulk electrolysis. The dual electrochemical catalysis includes a direct electrochemical catalysis and an indirect Bi0 mediated chemical catalysis. Production of chemisorbed oxygen, which is caused by the oxygen vacancies originated from both the distorted scheelite lattice and the electro-generated lower-valence Bi specie at lattice surface, contributes to the direct catalysis. Otherwise, the electro-generated Bi0 from Bi3+ reduction reacts with adsorbed oxygen to H2O2, enhancing H2O2 production. Additionally, Bi2Mo3O12/Ti was used as cathode in EF system containing ferric alginate gel beads. This EF system shows high efficient characteristics toward the degradation of acid orange II (AOII), and the removal percentage of AOII maintained about 94% in the wide pH range of 3.0–9.0. In brief, this paper not only provides a high efficient Bi2(MoO4)3/Ti cathode for H2O2 production, but also reveals a dual catalysis mechanism using Bi2(MoO4)3 modified cathode in EF system.

Enhancing visible light photocatalytic performance with N-doped TiO2 nanotube arrays assisted by H2O2

N-doped TiO2 nanotube arrays were prepared by an electrochemical anodization method and subsequent ammonia annealing. Microstructures, morphology, optical properties and photocatalytic properties of the N-doped TiO2 nanotube arrays were measured and analyzed. In the degradation of Acid Orange II(AO-II), the photocatalytic degradation efficiency of the N-doped TiO2 nanotube arrays assisted by H2O2 are 12 times, 2 times and 5 times higher than TiO2 nanotube arrays, TiO2 nanotube arrays assisted by H2O2 and H2O2, respectively. Experimental results show that the N-doped TiO2 nanotube arrays is a promising photocatalytic material for organic pollutant degradation under visible light, especially under the assistance of H2O2.

CeO2/Bi2MoO6 heterostructured microspheres with synergistic effect for accelerating photogenerated charge separation

CeO2/Bi2MoO6 heterostructured microspheres were successfully synthesized through precipitation and hydrothermal method. The as-obtained samples were well characterized by XRD, SEM, TEM, UV–Vis DRS and XPS. The photocatalytic activity was evaluated by degrading acid orange II (AO-II) under visible light irradiation. The test results show that CeO2/Bi2MoO6 heterostructured microspheres have broad absorption in the visible region and havemore superior catalytic activities than pure Bi2MoO6, which is attributed to the synergistic effect of the suitable band gap matching between CeO2 and Bi2MoO6. Moreover, 0.1CeO2/Bi2MoO6 composite has the highest activity. Radical scavenger experiments proves that the superoxide radical anions (O2−) and photogenerated holes (h+) are dominating active species. The recycling experiment confirms that CeO2/Bi2MoO6 heterostructure keep high stabilization during the photocatalytic reaction. Onthisbasis, a photogenerated charge carriers transfer and photocatalytic progress on the CeO2/Bi2MoO6 heterostructure has beendiscussed.

Enhanced heterogeneous Fenton-like systems based on highly dispersed Fe0-Fe2O3 nanoparticles embedded ordered mesoporous carbon composite catalyst

Acceleration of Fe3+/Fe2+ cycle and simultaneous reduction of particle size with enhanced stability is extremely important for iron-based heterogeneous Fenton catalysts. In this work, Fe0-Fe2O3 composite nanoparticles embedded ordered mesoporous carbon hybrid materials (Fe0-Fe2O3/OMC) were rationally designed as efficient heterogeneous Fenton catalysts. Because of the confinement and reduction of OMC, highly dispersed Fe0-Fe2O3 active species with diameter of ∼8 nm were generated by an optimized carbothermic reduction process. In addition, Fe0-Fe2O3/OMC possesses ordered mesoporous structure with uniform mesopore, high surface area and pore volume. For comparison, two other catalysts, including solely Fe0 nanoparticles supported on ordered mesoporous carbon (Fe0/OMC) and solely Fe2O3 nanoparticles supported on ordered mesoporous carbon (Fe2O3/OMC) were also prepared. The Fenton catalytic performance of synthesized catalysts was evaluated by using H2O2 as oxidizing agent to degrade Acid Orange II (AOII). The results show that almost 98.1% of 100 mg L−1 AOII was removed by Fe0-Fe2O3/OMC in condition of neutral pH and nearly room temperature, which is much higher than those of compared catalysts. The enhanced catalytic activity of Fe0-Fe2O3/OMC for AOII removal is due to the efficient electron transfer between the Fe0 and iron oxide and the accelerated Fe3+/Fe2+ cycle. The stability and reusability of the catalyst was also investigated, which showed a good performance even after five consecutive runs. The as-synthesized catalyst is proved to be an attractive candidate in heterogeneous Fenton chemistry and practical application.

Synthesis and characterization of Zr(IV) doped immobilized cross-linked chitosan/perlite composite for acid orange II adsorption

To enhance the adsorption capacity of chitosan for acid orange II (AOII) adsorption, a novel adsorbent, zirconium(IV) doped immobilized cross-linked chitosan/perlite (Zr(IV)-CS-PT) composite was synthesized and characterized. Batch studies were conducted to analyze the effect of different parameters on AOII adsorption, such as Zr (IV) loading amount, pH, adsorbent dosage and temperature. Also, kinetic data revealed that AOII adsorption was well described by pseudo-second order kinetic model. Langmuir adsorption isotherm model was best described the isotherm data and maximum adsorption capacity was found 476.2 mg/g at natural pH. The thermodynamic data showed that the AOII adsorption occurred spontaneously and endothermic nature. Desorption and recycle experiments showed that after six cycle the adsorption efficiency was decreased from 95.6% to 90.1%, which shows the Zr(IV)-CS-PT is a reusable, cost-effective and high adsorption capacity adsorbent.

Application of a novel definitive screening design to in situ chemical oxidation of acid orange-II dye by a Co2+/PMS system

In this work, a novel definitive screening design (DSD) was initially used to investigate the in situ chemical oxidation of acid orange-II (AO II) dye using a homogeneous cobalt-catalyzed peroxymonosulfate (Co2+/PMS) system.

One step pyridine-assisted synthesis of visible-light-driven photocatalyst Ag/AgVO3

Ag/AgVO3 nanorods have been obtained for the first time by one step hydrothermal method with the contribution of pyridine. The prepared sample was systematically characterized. Their photocatalytic properties were investigated by degrading acid orange II (AO-II) under visible light. Compared with pure AgVO3, Ag/AgVO3 nanorods showed much higher photocatalytic activity and stability. The enhanced photocatalytic activity was attributed to Ag nanoparticles (NPs) with a strong surface plasmon resonance (SPR). Further studies indicate that the photogenerated holes (h+) and superoxide radical anions (O2−) were major active species. Ag/AgVO3 nanorods has a huge potential application in wastewater treatment.