CaTiO3 Nanoparticles Research Articles

Solar-based Photocatalytic Degradation of Wastewater by Vanadium-doped CaTiO3 Nanoparticles

Solar-based Photocatalytic Degradation of Wastewater by Vanadium-doped CaTiO3 Nanoparticles

CaTiO3 nanoparticles as functional additives for the BaTiO3-based X8R type dielectric ceramics

This research investigates the potential of Calcium titanate (CaTiO3 or CT) nanoparticles as functional additives to enhance the dielectric properties of Barium titanate (BaTiO3 or BT)-based ceramic dielectrics. To address the need for high-temperature stability in MLCC (multilayer ceramic capacitor) applications, especially within the automotive and aerospace sectors, we have explored BT-based complex perovskite solid solutions comprising various cation substitutions, including Ca2+ and Yb3+, into barium titanate (BT) as a method to suppress the dielectric property anomaly near the Curie temperature effectively. The focus is on the impact of the application of CT nanoparticles as additive materials on phase formation, microstructure development, and dielectric behavior of the resulting ceramics to align with the Extended 'Temperature Coefficient of Capacitance (TCC)' criteria defined by the EIA X8R specification. When the hydrothermally synthesized CT nanopowder was applied in the Ca-doped BT ceramics fabrications as source material of the Ca dopants, it was beneficial to achieve both temperature stability and high dielectric constant. The CT nanoparticles are believed to play multiple roles during the solid-state reaction with BT and rare earth dopant (Yb). Since the Yb3+ ions can be more easily dissolved into the CT lattice than BT with their amphoteric character, the CT nanoparticles in the BT-CT-Yb2O3 mixture can act as an intermediary, dissolving the Yb3+ first in its A- or B-site before the final solid-solution formation with the BT. The sequential substitutions of the Yb3+ and Ca2+ into BT via CT nanoparticles could affect the site occupancy of Ca2+ in the BT lattice, which is very important in determining the dielectric properties of the Ca-doped BT processed in reducing atmospheres. Through a comprehensive experimental approach, including phase composition analysis via X-ray diffraction (XRD) and microstructural examination using Field Emission Scanning Electron Microscopy (FE-SEM) and Transmission Electron Microscopy (TEM), this work reveals the significance of synthetic methodology and dopant incorporation strategy on achieving a desired core-shell microstructure and improved dielectric performance. This research underscores the efficacy of CT nanoparticles as a promising route towards the development of BT-based dielectric ceramics with superior temperature stability, offering valuable insights for the advancement of MLCC technology to cater to high-temperature applications.

Twin Boundaries-Induced Centrosymmetric Breaking of Hollow CaTiO3 Nanocuboids for Piezocatalytic Hydrogen Evolution.

Piezocatalysis, a transformative mechanochemical energy conversion technique, has received considerable attention over the past decade for its role in processes such as hydrogen evolution from water. Despite notable progress in the field, challenges remain, particularly in the areas of limited piezocatalysis efficiency and limited availability of materials requiring a non-centrosymmetric structure. Here, a pioneering contribution is presented by elucidating the piezocatalytic properties of hollow CaTiO3 nanocuboids, a centrosymmetric material with a nominally nonpolar state. Remarkably, CaTiO3 nanocuboids exhibit an impressive hydrogen production rate of 3.44mmolg-1h-1 under ultrasonic vibrations, surpassing the performance of the well-established piezocatalyst BaTiO3 (2.23mmolg-1h-1). In contrast, commercial CaTiO3 nanoparticles do not exhibit piezocatalytic performance. The exceptional performance of hollow CaTiO3 nanocuboids is attributed to the abundance presence of twin boundaries on the {110} facet within its crystal structure, which can impart significant polarization strength to CaTiO3. Extending the investigation to other centrosymmetric materials, such as SrZrO3 and BaZrO3, the experimental results also demonstrate their commendable properties for piezocatalytic hydrogen production from water. This research underscores the significant potential of centrosymmetric materials in piezocatalysis.

Perovskite oxide nanoparticles: Dual role as supports for luminescent Eu(III) ions and photocatalysts for bisphenol degradation

Perovskite oxides, such as CaTiO3, SrTiO3, and BaTiO3, have gained significant recognition for their dual role as luminescence supports and photocatalytic materials. In this study, we synthesized perovskite oxide nanoparticles (NPs) using the thermal calcination method and employed them as photocatalysts for the degradation of bisphenol S (BPS) and bisphenol AF (BPAF) under UVC irradiation. The as-synthesized photocatalysts were thoroughly examined for the photocatalytic degradation process and identified secondary products were identified using liquid chromatography in conjunction with high-resolution mass spectrometry. Our observations highlighted the relatively faster photocatalytic degradation of BPS compared to BPAF. Notably, among the perovskite oxide materials, SrTiO3 exhibited the highest catalytic activity for BPS degradation, while BaTiO3 outperformed in the case of BPAF degradation. Perovskite oxide NPs were also utilized as supports for doping with Eu3+ ions to create phosphor supports. Luminescent emissions from the Eu3+ ions, characterized by the 5D0 → 7FJ = 0-4 transitions, were observed and varied depending on the support material. Notably, Eu3+ doped in CaTiO3 nanoparticles exhibited the highest luminescence efficiency. These results highlight the dual functionality of perovskite oxide-based materials in phosphor applications and photocatalysis, offering valuable insights into their potential for both enhancing luminescence efficiency and treating bisphenols.

Effect of calcination temperature on structural, optical and photocatalytic properties of calcium titanate (CaTiO3) nanoparticle

In this study, the sol–gel method was used to synthesize calcium titanate (CaTiO3) at different calcination temperatures (400–800 °C). The main objective of this work is to find, using various characterization techniques, how the calcination temperature influences the optical, structural, and photocatalytic properties of CaTiO3. According to the DTA/TGA analysis, 600 °C was the ideal calcination temperature for the synthesis of CaTiO3 nanoparticles. The photocatalytic treatment of simulated wastewater demonstrates its potential application in wastewater treatment. For all calcination temperatures, the percentage of Chemical Oxygen Demand (COD) removed after treatment was 100 % for the initial COD of 700 mg/L, more than 83 % for the initial COD of 5000 mg/L, and more than 71 % for the initial COD of 16000 mg/l.

Chitosan as a suitable host for sustainable plasticized nanocomposite sodium ion conducting polymer electrolyte in EDLC applications: Structural, ion transport and electrochemical studies

The challenge in front of EDLC device is their low energy density compared to their battery counter parts. In the current study, a green plasticized nanocomposite sodium ion conducting polymer blend electrolytes (PNSPBE) was developed by incorporating plasticized Chitosan (CS) blended with polyvinyl alcohol (PVA), doped with NaBr salt with various concentration of CaTiO3 nanoparticles. The most optimized PNSPBE film was subsequently utilized in an EDLC device to evaluate its effectiveness both as an electrolyte and a separator. Structural and morphological changes were assessed using XRD and SEM techniques. The PNSPBE film demonstrated a peak ionic conductivity of 9.76×10−5 S/cm, as determined through EIS analysis. The dielectric and AC studies provided further confirmation of structural modifications within the sample. Both TNM and LSV analyses affirmed the suitability of the prepared electrolyte for energy device applications, evidenced by its adequate ion transference number and an electrochemical potential window of 2.86 V. Electrochemical properties were assessed via CV and GCD techniques, confirming non-Faradaic ion storage, indicated by the rectangular CV pattern at low scan rates. The parameters associated with the designed EDLC device including specific capacitance, ESR, power density (1950 W/kg) and energy density (12.3 Wh/kg) were determined over 1000 cycles.

Alleviation of calcium hydroxide nanoparticles induced genotoxicity and gastritis by coadministration of calcium titanate and yttrium oxide nanoparticles in mice

Diverse applications of nanoparticles due to their unique properties has rapidly increased human exposure to numerous nanoparticles such as calcium hydroxide (Ca(OH)2), calcium titanate (CaTiO3), and yttrium oxide (Y2O3) nanoparticles almost in all aspect of daily life. However, very limited data are available on the effect of these nanoparticles on genomic DNA integrity and inflammation induction in the gastric tissues. Hence, this study estimated the effect of Ca(OH)2, CaTiO3, or/and Y2O3 nanoparticles multiple oral administration on the genomic DNA damage and inflammation induction in the mice gastric tissues. A suspension containing 50 mg/kg b.w of Ca(OH)2, CaTiO3, or Y2O3 nanoparticles were given orally to male mice separately or together simultaneously three times a week for two consecutive weeks. Multiple oral administration of Ca(OH)2 nanoparticles led to significant elevations in DNA damage induction and ROS generation, in contrast to the non-significant changes observed in the level of induced DNA damage and generated ROS after administration of CaTiO3 or Y2O3 nanoparticles separately or in combination with Ca(OH)2 nanoparticles. Oral administration of Ca(OH)2 nanoparticles alone also highly upregulated INOS and COX-2 genes expression and extremely decreased eNOS gene expression. However, high elevations in eNOS gene expression were detected after multiple administration of CaTiO3 and Y2O3 nanoparticles separately or together simultaneously with Ca(OH)2 nanoparticles. Meanwhile, non-remarkable changes were noticed in the expression level of INOS and COX-2 genes after administration of CaTiO3 and Y2O3 nanoparticles separately or simultaneously together with Ca(OH)2 nanoparticles. In conclusion: genomic DNA damage and inflammation induced by administration of Ca(OH)2 nanoparticles alone at a dose of 50 mg/kg were mitigated by about 100% when CaTiO3 and Y2O3 nanoparticles were coadministered with Ca(OH)2 nanoparticles until they reached the negative control level through altering the expression level of eNOS, INOS and COX-2 genes and scavenging gastric ROS. Therefore, further studies are recommended to investigate the toxicological properties of Ca(OH)2, CaTiO3 and Y2O3 nanoparticles and possibility of using CaTiO3 and Y2O3 nanoparticles to mitigate genotoxicity and inflammation induction by Ca(OH)2 nanoparticles.

Photocatalytic treatment of landfill leachate using CaTiO3 nanoparticles

Perovskite Calcium titanate (CaTiO3)is a versatile material that can be used in several applications, such as biomedicine, electronic devices, photocatalysis, and wastewater treatment.In this study, CaTiO3nanoparticles were synthesized using the sol–gel method at 600 °C with the help of tetra butyl titanate, calcium nitrate, and citric acid as chelating agents. FESEM and TEM analysis shows the synthesized nanoparticle has particle sizes of less than 26.23 and 23.71 nm respectively with a bandgap of 3.57 eV. By using DTA, TGA, XRD, FESEM, TEM, EDX, and UV–Vis, the thermal, structural, and optical properties were examined. Several studies examined the photocatalytic capabilities of CaTiO3for the photocatalytic treatment of simulated dye solution and wastewater produced by the textile industry. In this study, the CaTiO3 nanoparticles are used in the photocatalytic treatment of landfill leachate. The results are promising, showing a 72 % reduction in chemical oxygen demand (COD),a 43.62 % decrease in colour,a 41.75 % improvement in turbidity, 59.01 % removal of total dissolved solids, and35.71 % removal of NH3-N from the landfill leachate under the optimum condition of 33 W UV irradiation for 8 h at a catalyst dose of 3.33 g/L and a pH of 6. After nano-photocatalytic treatment, the percentages of Cr, Ni, and Zn removed are 52.30 %, 63.46 %, and 87.50 %, respectively.

Gamma radiation-induced synthesis of novel PVA/Ag/CaTiO3 nanocomposite film for flexible optoelectronics

A flexible nanocomposite film based on polyvinyl alcohol (PVA), silver nanoparticles, and calcium titanate (CaTiO3) was synthesized using gamma radiation induced-reduction. Temperature-dependent structural, optical, DC electrical conductivity, electric modulus, and dielectric properties of PVA/Ag/CaTiO3 nanocomposite film were investigated. The XRD pattern proved the successful preparation of the nanocomposite film. Also, as the temperature increases, the average crystallite sizes of CaTiO3 and Ag nanoparticles decrease from 19.8 to 9.7 nm and 25 to 14.8 nm, respectively. Further, the optical band gap increased from 5.75 to 5.84 eV with increasing temperature. The thermal stability is improved, and the semiconductor behavior for PVA/Ag/CaTiO3 nanocomposite film is confirmed by thermal activation energy ΔE with values in the 0.11–0.8 eV range. Furthermore, the maximum barrier Wm value was found of 0.29 eV. PVA/Ag/CaTiO3 nanocomposite film exhibits a semicircular arc originating from the material’s grain boundary contributions for all temperatures. The optical, DC electrical conductivity, and dielectric properties of the PVA/Ag/CaTiO3 nanocomposite film can be suitable for flexible electronic devices such as electronic chips, optoelectronics, and energy storage applications.

Improved capacitive energy storage capability of P(VDF-HFP) nanocomposites enabled by cost-effective and ergodic relaxor phase dominant nanofillers

Polymer-based dielectrics with excellent processability are essential for dielectric capacitors applications in modern electronics and electrical power systems. Although significant advances in capacitive storage have been achieved by adding inorganic fillers that are synthesized primarily by liquid-phase technology, this method faces considerable challenges for the industrial production of scalable capacitor films that requires easy process conditions. Herein, P(VDF-HFP) nanocomposites with cost-effective inorganic 0.7[0.955(Bi0.5Na0.5)TiO3-0.045Ba(Al0.5Ta0.5)O3]-0.3CaTiO3 nanoparticles (BNT-BAT-CT nps) that are prepared by a combination of solid phase approach and sieving, are constructed via a scalable and practical mechanical process. Both experimental and simulation results verify that the appropriate BNT-BAT-CT nps can significantly suppress the leakage current density, improve the dielectric constant, and block the penetration of the electrical tree, thus generating substantial enhancements in the breakdown strength and capacitive performance. A large discharge energy density (∼10.82 J/cm3) is realized at 580 MV/m in 3 vol% BNT-BAT-CT/P(VDF-HFP) nanocomposites, which is approximately 2.17 times larger than that of pristine P(VDF-HFP). More significantly, unlike previous polymer nanocomposites incorporated with high-cost nanofillers, the designed nanocomposites contain low preparation cost of nanofillers. Combined with the merits of high energy-storage performance and simple and cost-effective preparation, this work offers a viable method towards the large-scale production of polymer-based high-performance dielectrics.

Low temperature synthesis and thermal expansion study of nanocrystalline CaTiO3

We have successfully synthesized nanocrystalline calcium titanate (CaTiO3) at low temperature by wet chemical method. The prepared CaTiO3 was characterized by simultaneous Thermogravimetry-differential thermal analysis. The CaTiO3 nanoparticles at different annealing temperatures confirms the formation of the single-phase CaTiO3 at 700 °C for 1 h. The influence of annealing temperatures on the microstructures are investigated by SEM and TEM.The thermal expansion of sintered CaTiO3 in the range of 30 °C to 950 °C exhibits average linear thermal expansion coefficient (α) of 12.94 × 10−6 K−1. The nanocrystalline CaTiO3 powder pelletized and sintered at 1250 °C for 5 h has achieved density > 95 %.

Anisotropic chitosan micropatterning containing metformin functionalized calcium titanate (CaTiO3) nanoparticles for regulating dorsal root ganglion behavior

The surface topological structures of the artificial implants are conducive to induce orientation growth of nerve cells and promote nerve regeneration. However, their effect on long-distance extension of dorsal root ganglion (DRG) axons is still limited and needs further enhancement. In this study, an anisotropic chitosan (CS) micropatterning containing metformin (Me) functionalized CaTiO3 (CTO) nanoparticles (NPs) for regulating DRG behavior was fabricated by micro-molding and biomodification method. The physicochemical properties of CTO nanoparticles as a function of biomodification by poly-dopamine (PDA) and Me were monitored by Zeta (ζ) potential, Fourier Transform infrared spectroscopy (FTIR), X-ray Powder Diffraction (XRD), Scanning Electron Microscopy (SEM), and Energy Dispersive X-Ray Spectroscopy (EDX) analysis, respectively. The morphology, structure, and wettability of the CS micropatterning were characterized. In addition, Atomic Force Microscope (AFM) was used to scan the topological membrane surface to explore its surface profile. The in vitro effect of the micropatterning on DRG axon behavior including morphology, length and orientation was evaluated. The results showed that PDA-modified CTO NPs could load Me effectively and showed considerable stability. The addition of Me functionalized CTO NPs obviously improved the hydrophilicity and roughness of the CS micropatterning. DRG culture showed that the axon extension on the topology followed the arrangement direction of the anisotropic microstructure. Compared with the pure CS micropatterning, the length of the axon extension on the surface of Me-PDA-CTO-CS was significantly improved about 61.1%, indicating an obvious axonal extension promotion effect. Therefore, it is concluded that the Me-PDA-CTO-CS could constrain the direction of axon extension while obviously promoting axon growth, which may be expected to provide a new strategy for repairing peripheral nerve injury (PNI).

The high photocatalytic efficiency and stability of the Z-scheme CaTiO3/WS2 heterostructure for photocatalytic removal of 17α-ethinyl estradiol in aqueous solution

In this study, a new Z-scheme CaTiO3/WS2 heterostructure composed of CaTiO3 nanoparticles and WS2 nanosheets was rationally constructed and successfully fabricated through a facile ultrasonication strategy, a continuous stirring process and a heat treatment method, successively. As expected, the resultant Z-scheme CaTiO3/WS2 heterostructure displayed drastically improved photocatalytic performance of 17α-ethinyl estradiol (EE2) degradation in an aqueous solution under UV-light irradiation. Significantly, the optimization of the Z-scheme CaTiO3(20 wt%)/WS2 heterostructure revealed prominent photocatalytic activity for EE2 degradation rate up to 0.0024 min−1 under UV-light irradiation, which was about 12 and 4 times larger than those of pure WS2 and pristine CaTiO3, respectively. The Z-scheme CaTiO3(20 wt%)/WS2 heterostructure achieved the highest photodegradation rate of more than 96 % for EE2 photodegradation in 120 min under visible light irradiation. The improved photocatalytic performance could be mainly ascribed to the formation of a direct Z-scheme LaNiO3/g-C3N4 heterojunction, which results in the interfacial charge transfer efficiency and the strong redox ability of the photogenerated electrons and holes. Additionally, the degradation mechanism of EE2 by active species trapping showed that the synergistic effect of superoxide radicals (•O2–) and holes were the main active species and were responsible for the photodegradation of EE2. This work will provide a new design approach to construct high-performance Z-scheme WS2-based composite photocatalysts for photocatalyst degradation of EE2 and environmental remediation.

Characteristics of PEO Incorporated with CaTiO3 Nanoparticles: Structural and Optical Properties.

In this research, direct band gap polymer composites with amorphous phase, which are imperative for optoelectronic devices applications were synthesized. The solution cast technique was used to produce polyethylene oxide (PEO)/calcium titanate (CaTiO3) nanocomposite (NC) films. The X-ray diffraction (XRD) confirms the growth of amorphous nature within PEO with CaTiO3 addition. The optical band gaps of pure PEO and PEO/CaTiO3 NC films were calculated using analysis of ultraviolet–visible (UV-Vis) spectra. The change in absorption edge toward lower photon energy is evidence of polymer modification. The dispersion behavior of the refractive index of PEO was manipulated to a higher wavelength upon doping with CaTiO3. Upon adding CaTiO3 to the pure PEO polymer, the dielectric constant and refractive index were considerably modified. The band gap shifts from 4.90 eV to 4.19 eV for the PEO incorporated with an optimum portion of 8 wt. % of CaTiO3. The types of the electronic transition in composite samples were specified, based on the Taucs model and the optical dielectric loss. The alteration of UV/Vis absorption spectra of the NC film was considered a suitable candidate to be applied in nanotechnology-based devices. The spherulites ascribed to the crystalline phase were distinguished through the optical microscopy (OM) study.

Unpredicted Visible Light Induced Advanced Photocatalytic Performance of Eu Doped CaTiO3 Nanoparticles Prepared by Facile Sol–Gel Technique

Unpredicted Visible Light Induced Advanced Photocatalytic Performance of Eu Doped CaTiO3 Nanoparticles Prepared by Facile Sol–Gel Technique

Microwave Synthesis of CaTiO3 Nanoparticles by the Sol-Gel Method

A technique for the microwave-activated synthesis of calcium titanate nanopowder was proposed. The microwave effect used in the synthesis of CaTiO3 samples when using sodium carbonate as a precipitant allowed obtaining a chemically homogeneous nanopowder with a significant reduction of the process time.
 
 
 

Size-dependent phase transformation and its correlation with magnetic properties of multiferroic 0.8BiFeO3– 0.2CaTiO3 nanoparticles

Structural and magnetic properties of 0.8BiFeO3–0.2CaTiO3 (BF-20CT) nanoparticles were investigated systematically as a function of heat treatment at 500 °C, 650 °C, 800 °C and 950 °C of a sol-gel derived powder. The structural investigation by the Rietveld refinement revealed the phase transformation from monoclinic (Cc) to rhombohedral (R3c) structure. The lattice parameters, bond angles, bond distance, and unit cell volume significantly changed as temperature increases from 500 to 950 °C. TEM investigation has confirmed the size, morphology, and microstructure of the BF-20CT nanoparticles. Enhanced magnetization with the finite coercive field was observed as phase changed from monoclinic (Cc) to rhombohedral (R3c). The splitting in zero-field cooling (ZFC) and field cooling (FC) magnetization curves with a sharp peak in the ZFC curves revealing a spin-glass type behavior.

Experimental data of CaTiO3 photocatalyst for degradation of organic pollutants (Brilliant green dye) - Green synthesis, characterization and kinetic study.

The data presented here focuses on the physicochemical characterization of perovskite CaTiO3 nanoparticles (orthorhombic) as photocatalyts and the kinetic study of their photodegradation performance toward organic pollutant, i.e. brilliant green (BG) which is azo derivatives dye. The CaTiO3 nanoparticles was synthesized using chicken eggshell-derived CaCO3 and anatase TiO2 with molar ratio of (1:1), (1:3), (2:5), and (2:7). The physical and microstructural properties of CaTiO3 were characterized by X-ray diffractometer (XRD), scanning electron microscope (SEM), Fourier Transform Infrared (FTIR) and UV/vis spectrometer. The effect of initial dye concentration, catalyst composition, and catalyst dosage on the adsorption mechanism of dye on CaTiO3 was investigated in jacketed photoreactor under UV irradiation. The analysis reveals that BG molecules are efficiently chemisorbed, as indicated by pseudo first order kinetic, and degraded within 120 min. Considering the low-cost preparation process and high photocatalytic performance, the resultant CaTiO3 can further be used as an efficient photocatalyst for organic pollutant removal from aqueous and industrial wastewater.

Cross-Linked SPEEK–PEG–APTEOS-Modified CaTiO3 Perovskites for Efficient Acid–Base Cation-Exchange Membrane Fuel Cell

Nanocomposite membranes are synthesized by the combination of sulfonated poly(ether ether ketone) (SPEEK), poly(ethylene glycol) (PEG), and 3-aminopropyl triethoxysilane (APTEOS)-modified CaTiO3. From thermogravimetric analysis (TGA) and mechanical and Arrhenius studies, it is seen that the covalent cross-linking of PEG with SPEEK exhibits a lower weight loss (91.84 wt %) at 120 °C than SPEEK (88.19 wt %). Moreover, higher activation energy (Ea) and tensile stress values are obtained in the order of 26.23 kJ/mol and 23.32 MPa, respectively. The APTEOS-modified CaTiO3 nanoparticles impregnated into the SPEEK/PEG membrane cause the acid–base proton hopping mechanism (HSO3/NH2) and induce a more compact structure. The nanocomposite membranes possess exceptional proton conductivity, thermal, oxidative, and physicochemical properties than SPEEK. Further, 6 wt % functionalized CaTiO3 in the SPEEK/PEG membrane manifests the highest values of proton conductivity, current density, and power density at 80 °C in 100% RH of 65.32 mS cm–1, 403 mA cm–2, and 90 mW cm–2 with an open-circuit voltage (OCV) of 0.90 V, respectively. This membrane retains 95.37 wt % original weight during 3 h of the Fenton test.

Synthesis of Hollow B-SiO2@CaTiO3 Nanocomposites and Their Photocatalytic Performance in Ammonia Nitrogen Degradation

Hollow B-SiO2@CaTiO3 nanocomposites were hydrothermally synthesized at a mild reaction temperature of 120 °C using calcium chloride and titanium (IV) isopropoxide as the starting materials and hollow B-SiO2 microspheres as the supports. CaTiO3 nanoparticles are anchored at the surfaces of hollow B-SiO2 microspheres through the formation of Ti–O–B and Ti–O–Si bonds. The interaction between the CaTiO3 nanoparticles and hollow B-SiO2 microspheres enlarged the band gap of CaTiO3 nanoparticles, giving a higher photocatalytic activity in ammonia nitrogen degradation at a lower catalyst loading and a wider range of ammonia nitrogen concentration. When the hollow B-SiO2@CaTiO3 (5wt%CaTiO3) photocatalyst was hydrothermally synthesized at 120 °C for 12 h, and the photocatalytic degradation reaction of ammonia nitrogen (50 mg L−1) in an aqueous solution was carried out under the simulated solar light irradiation at 25 °C for 4 h; the degradation extent of ammonium nitrogen reached 91%.