Photocatalytic purification of contaminated air in intensive care units by ZnSn(OH)6 nanoparticles

Peng, Xiujuan; Jiang, Mengmeng; Wang, Xinchen; Li, Danzhen; Sun, Shuhui; Shao, Yu; Zheng, Yi

doi:10.1007/s11356-021-12970-2

Cited by 4 publications

(1 citation statement)

References 34 publications

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“…So the indirect bandgaps of diferent morphologies of ZnSn(OH) 6 are approximately 3.0 eV. Based on the previous study [33,34], the conduction band (CB) and the valance band (VB) of the ZnSn(OH) 6 are approximately −0.52 and 3.16 eV vs. NHE, respectively.…”

Section: Brunauer-emmett-teller (Bet) and The Pore Structurementioning

confidence: 90%

Photodegradation of Methylene Blue Using Carbon-Doped ZnSn(OH)6 Composite Coated on Membrane

Fenelon

Ni’am

Nguyen

et al. 2023

Journal of Chemistry

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The dye contamination of water is a global concern in the environment. In this study, the photocatalytic technology and membrane module were combined to improve the surface distribution of the active species of the catalyst for better degradation of the methylene blue (MB) dye under visible light. ZnSn(OH)6 was chosen due to carbon’s complex metal oxide doped to facilitate the application under visible light. The numerous characterizations were analyzed in the composites to verify the consistency of the optimum degradation of MB over the catalyst coated on the membrane. During the preparation of the ZnSn(OH)6 composite, the results confirmed that different reaction times and amounts of sodium hydroxide significantly affected the pollutant’s degradation. The carbon-doped composite denoted the largest surface area and increased the catalyst’s reactive sites on the membrane. The photocatalytic activity test showed that 1% carbon doped on ZnSn(OH)6 prepared at 160°C by hydrothermal method coated on the membrane had the optimal degradation of 89.74% of MB. This study contributes to the ongoing study and development of photocatalytic membranes for the photodegradation of wastewater treatment.

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Section: Brunauer-emmett-teller (Bet) and The Pore Structurementioning

confidence: 90%

Photodegradation of Methylene Blue Using Carbon-Doped ZnSn(OH)6 Composite Coated on Membrane

Fenelon

Ni’am

Nguyen

et al. 2023

Journal of Chemistry

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Development and performance evaluation of an intelligent air purifier/humidifier using fuzzy logic controller

Emenuvwe

Umar

Umaru

et al. 2023

International Journal of Low-Carbon Technologies

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This study aimed to develop and implement a fuzzy logic controlled-intelligent air purifier/humidifier. The concepts of passive purification and evaporative humidification were used to build this device, and engineering ideas and theories were used to guide the development of electrical and mechanical systems. Additionally, a fuzzy logic controller was designed, built, and integrated into the air purifier/humidifier device to help with its operation. It does this by analyzing input signals from all the sensors (dust, VOC gas, humidity, and water level) and activating the actuators (suction and blow fan). On the Arduino IDE, a C/C++ programming code was developed and uploaded onto the Arduino Uno R3 board, which houses the ATmega328P microcontroller processor. In estimating the clean air delivery rate, noise level, and moisture delivery rate, the performance of the developed air purifier/humidifier was assessed. Additionally, the electrical systems’ power consumption and the fuzzy logic controller’s ease of use were each assessed. In light of the room capacity taken into consideration, the findings obtained demonstrated that the proposed air purifier/humidifier device satisfies the minimum standard requirement of a clean air delivery rate of 140m3/hr. The outcome also revealed that the designed device’s noise level is lower than the typical threshold for an air purifier, which is less than 40 decibels. Additionally, after 68 minutes, the device raised the humidity level in a controlled area from 21% to 40%.

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Preparation of La2O3-modified BaSn Composite Nanorods and Photocatalytic Properties toward Crystal Violet

et al. 2023

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Background: The separation efficiency of the electron and hole pairs of the BaSn composite nanorods is limited due to a wide band gap energy restricting the photocatalytic treatment ability of the composite nanorods. It is an efficient route to improve the photocatalytic properties of the semiconductor photocatalysts by La2O3 modification. Objective: This study aims to synthesize La2O3-modified BaSn composite nanorods through a simple method and research the photocatalytic performance of the La2O3-modified BaSn composite nanorods for crystal violet degradation. Methods: La2O3 modified BaSn composite nanorods were synthesized by a facile method using lanthanum acetate as the lanthanum raw material and evaluated by electron microscopy, solid diffuse reflectance spectra, X-ray diffraction, photoluminescence and photocatalytic measurement for crystal violet degradation under ultraviolet light irradiation. Results: BaSn composite nanorods consist of orthorhombic SnO2, monoclinic BaSn(OH)6, and monoclinic Ba(OH)2. La2O3 suppresses the growth of the monoclinic BaSn(OH)6, and orthorhombic SnO2. The La2O3-modified BaSn composite nanorods possess coarse surface covered with the La2O3 nanoscale particles with an average size of about 50 nm. The absorption edge red-shifts to 373 nm and the band gap energy reaches 3.32 eV of the La2O3 modified BaSn composite nanorods compared with the BaSn composite nanorods. 20 mL 10 mg·L-1 crystal violet solution can be entirely removed by 20 mg composite nanorods with 15wt.% La2O3 content under ultraviolet light irradiated for 120 min. The reaction rate constant is 2.4 times higher than that of the non-modified composite nanorods. Hydroxyl radicals and holes are the reaction active substances for crystal violet degradation in the composite nanorod reaction system. Conclusion: La2O3 modification decreases the band gap energy, enhances the light absorption ability, and suppresses the recombination of the electron and hole pairs of the composite nanorods.

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Photocatalytic purification of contaminated air in intensive care units by ZnSn(OH)6 nanoparticles

Cited by 4 publications

References 34 publications

Photodegradation of Methylene Blue Using Carbon-Doped ZnSn(OH)6 Composite Coated on Membrane

Photodegradation of Methylene Blue Using Carbon-Doped ZnSn(OH)6 Composite Coated on Membrane

Development and performance evaluation of an intelligent air purifier/humidifier using fuzzy logic controller

Preparation of La2O3-modified BaSn Composite Nanorods and Photocatalytic Properties toward Crystal Violet

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