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[en] Microcystins (MCs) is a kind of hepatotoxin, which is the secondary metabolite of cyanobacteria. Bi2O2CO3 (BOC) is a kind of cheap and nontoxic semiconductor material. BOC was synthetized by solvothermal method and then microcystin-LR (MC-LR) and microcystin-RR (MC-RR) were removed by BOC, through adsorption and photocatalytic degradation. When the dosage of BOC is 6 g/L, the MC-LR and MC-RR in the natural water sample can be completely adsorbed in 30 min and then after 12 h irradiation, MC-LR and MC-RR were photocatalytically degraded by BOC.
Journal
Environmental Science and Pollution Research International; ISSN 0944-1344; 
; CODEN ESPLEC; v. 25(12); p. 11867-11874
; CODEN ESPLEC; v. 25(12); p. 11867-11874
[en] Highlights: • Pt loaded ZnO-RGO nanoheterostructures have been used for photocatalytic reduction of 4-nitrophenol. • Nanoheterostructure with 5 wt% of RGO and 2 wt% of Pt exhibited highest photocatalytic activity. • Synergetic effect of fast charge transfer across Schottky barrier and high pollutant adsorption ability of RGO has been studied. • Mechanism for enhanced photocatalytic activity has been proposed.
Journal
[en] We have developed a simple apparatus using optical fiber technology and portable spectrometer and used it to investigate photocatalytic degradation process of three kinds of dyes. The material was characterized and the photocatalytic process was studied using this apparatus using in situ spectroscopic technology. Based on the characterization results and the theoretical calculation, the photocatalytic mechanism is also analyzed. (paper)
Journal
Materials Research Express (Online); ISSN 2053-1591; ; v. 5(1); [9 p.]
; v. 5(1); [9 p.]
[en] TiO2 and N-substituted TiO2-xNx were synthesized by using precipitation method. TiO2-xNx compound absorbed whole UV light as well as long wavelength of visible light (400 - 700 nm) because of the change of band gap from 3.2 eV to 1.77 eV. Results obtained revealed that TiO2-xNx showed higher activity than pure TiO2 or P-25 for visible-photocatalytic degradation of 1,4-dichlorobenzene
Journal
Journal of the Korean Chemical Society; ISSN 1017-2548; ; v. 54(1); p. 120-124
; v. 54(1); p. 120-124
[en] We report a chemical bath deposition approach for the preparation of large arrays of oriented ZnO nanostructures by activated substrate processes, and precipitated ZnO nanorods by passive occupation of the crystal surface. Photoluminescence dynamics showed that various visible emission characteristics associated with defects such as oxygen vacancy, zinc interstitial or their complexes. In addition, the precipitated ZnO nanorods exhibited excellent performance in the adsorption and photocatalytic decomposition of organic dyes, achieving 95% photodegradation of Rhodamine 6B. Moreover, oxygen defects function as trap sites with strong adsorption abilities towards organic dyes and showed high performance in the photocatalytic degradation of the dye molecules.
Journal
[en] Core/shell-structured nanodiamonds exhibit excellent adsorption and photocatalytic properties by annealing in an Ar atmosphere. Results show that core/shell-structured nanodiamond/onion-like carbon materials are obtained at high-temperature annealing (1400 °C–1500 °C) and possess a favorable visible light photocatalytic activity. Solutions with 10 and 100 mg L−1 methyl orange can be nearly degraded completely within 30 min and 1 h, respectively, using nanodiamonds annealed at 1500 °C. (paper)
Journal
Materials Research Express (Online); ISSN 2053-1591; ; v. 6(4); [7 p.]
; v. 6(4); [7 p.]
[en] In the present paper, we have investigated the effects of reaction temperature and duration of reaction on the properties of hydrothermally derived nano-crystalline Cu2SnSe3 (CTSe) powder. We report here for the first time, the morphology dependent photocatalytic performance of CTSe nanocrystals, which was analyzed by monitoring the photo-degradation of methylene blue (MB) dye under visible light irradiation. The reaction temperature and time was found to greatly influence the morphology of the nano-crystals, which consisted of flakes, discs or sheets in the nanometer range, depending upon the experimental conditions. Nanoflakes with rough surfaces degrade 73% of the dye in 3 h of light irradiation thus showing that highly crystalline CTSe nanocrystals having rough surfaces have the highest photocatalytic activity. (paper)
Journal
Materials Research Express (Online); ISSN 2053-1591; ; v. 6(2); [11 p.]
; v. 6(2); [11 p.]
[en] Photocatalytic reduction of hexavalent chromium (Cr(VI)) in ferric-tartrate system under irradiation of visible light was investigated. Effects of light resources, initial pH value and initial concentration of various reactants on Cr(VI) photocatalytic reduction were studied. Photoreaction kinetics was discussed and a possible photochemical pathway was proposed. The results indicate that Fe(III)-tartrate system is able to rapidly and effectively photocatalytically reduce Cr(VI) utilizing visible light. Initial pH variations results in the concentration changes of Fe(III)-tartrate complex in this system, and pH at 3.0 is optimal for Cr(VI) photocatalytic reduction. Efficiency of Cr(VI) photocatalytic reduction increases with increasing initial concentrations of Cr(VI), Fe(III) and tartrate. Kinetics analysis indicates that initial Fe(III) concentration affects Cr(VI) photoreduction most significantly
Journal
Bulletin of the Korean Chemical Society; ISSN 0253-2964; ; v. 33(11); p. 3691-3695
; v. 33(11); p. 3691-3695
[en] The present paper examined the photocatalytic degradation (PCD) of gas-phase trichloroethylene (TCE) over thin-film TiO2. A large-scale treatment of TCE was carried out using scale-up continuous flow photo-reactor in which nine reactors were arranged in parallel and series. The parallel or serial arrangement is a significant factor to determine the special arrangement of whole reactor module as well as to compact the multi-modules in a continuous flow reactor. The conversion of TCE according to the space time was nearly same for parallel and serial connection of the reactors.
Journal
[en] Optimized compositions of a four-color CMYK plus a green pigment have been prepared by the ceramic method: cobalt doping in Celsian (Ba0,9Co0,1)Al2Si2O8 (cyan), chromium in armalcolite (MgFe)(Cr0,2Ti2,8Fe)O10 (magenta), nickel in geikielite (Mg0,5Ni0,5)TiO3 (yellow), the perovskite CrNdO3 (green) and the same perovskite mineralized with alkaline earth fluorides (BaF2 and MgF2) (black). Both pigment powder and glazed sample in a conventional double firing frit (1050°C) have been characterized with respect to its colorimetric performance by the model CIEL*a*b*, its cooling capacity (as cool pigments) by the measurement of the solar reflection index SRI and its photocatalytic capacity by means of the OrangeII degradation test. The obtained results are compared with those obtained with commercial pigments of the CMY family of the zircon. The results indicate that the coloration of the powders and the enamelled samples is more intense, with L* values lower than the zircon homologous pigments, whereas the obtained chroma with the pigments of the zircon is better (b* negative for cyan, a* positive for magenta and b* positive for yellow). Regarding its cooling capacity, the results indicate high SRI values for all samples. In the case of Celsian SRI is higher than for vanadium-zircon, the green of perovskite slightly exceeds the eskolaite Cr2O3 value that is taken as reference. In the case of the black perovskite, very low SRI values are measured (SRI=0 in the case of powder) and associated with high middle-infrared emissivity values, making it interesting as a pigment for absorbent substrates in solar collectors. The photocatalytic capacity over OrangeII indicates half-life values around 55-70minutes, lower than those measured in zircons (110-190minutes).
[es]
Se han preparado por el método cerámico composiciones optimizadas de una cuatricromía CMYK más un pigmento verde, basados en el dopado de cobalto en celsiana (Ba0,9Co0,1)Al2Si2O8 (cian), de cromo en armalcolita (MgFe)(Cr0,2Ti2,8Fe)O10 (magenta), de níquel en geikielita (Mg0,5Ni0,5)TiO3 (amarillo), la perovskita CrNdO3 (verde) y la misma perovskita mineralizada con fluoruros alcalinotérreos (BaF2 y MgF2) (negro). Los pigmentos en polvo y los vidriados obtenidos con una frita convencional de bicocción (1.050°C) se han caracterizado respecto de su rendimiento colorimétrico mediante el modelo CIEL*a*b*; su capacidad refrigerante (como cool pigment), mediante la medida del índice de reflexión solar SRI, y su capacidad fotocatalítica, mediante el test de degradación de NaranjaII. Los resultados obtenidos se comparan con los obtenidos con pigmentos comerciales de la familia CMY del circón tomados como referencia. Los resultados indican una coloración intensa de los polvos y de las plaquetas vidriadas con valores L* inferiores a los pigmentos homólogos del circón, en cambio el chroma obtenido con los pigmentos del circón es superior (b* negativo para el cian, a* positivo para el magenta o b* positivo para el amarillo). Respecto a su capacidad refrigerante, los resultados indican valores SRI altos y superiores en el caso de la celsiana al del vanadio-circón, el verde supera ligeramente a la eskolaita Cr2O3, que se ha tomado como referencia, y en el caso de la perovskita negra sus valores SRI muy bajos (SRI=0 en el caso del polvo) y asociados a altos valores de emisividad en el infrarrojo medio la hacen interesante como pigmento para sustratos absorbentes en colectores solares. La capacidad fotocatalítica sobre NaranjaII indica valores de periodo de semivida en torno a 55-70min, inferiores a los medidos en los circones de referencia (110-190min).Journal
Boletin de la Sociedad Espanola de Ceramica y Vidrio; ISSN 0366-3175; ; CODEN BSCVB9; v. 56(4); p. 166-176
; CODEN BSCVB9; v. 56(4); p. 166-176
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