Treatment of Dye Wastewater Using Hydrothermally Prepared Nano-TiO2 Under Natural Light

2015 ◽  
Vol 26 (1) ◽  
pp. 142-146 ◽  
Author(s):  
Fa Chun Yan ◽  
Xun Wang
Keyword(s):  
Natural Light ◽  
Dye Wastewater ◽  
Nano Tio2

PHOTOCATALYTIC DEGRADATION PROPERTY OF NANO-TiO2/DIATOMITE FOR RODAMINE B DYE WASTEWATER

2009 ◽  
Vol 23 (06n07) ◽  
pp. 1683-1688 ◽  
Author(s):  
YUE LIU ◽  
SHUILIN ZHENG ◽  
GAOXIANG DU ◽  
FENG SHU ◽  
JUNTAO CHEN
Keyword(s):  
Reaction Time ◽  
Photocatalytic Degradation ◽  
Ultraviolet Light ◽  
Rhodamine B ◽  
Dye Wastewater ◽  
Nano Tio2 ◽  
Rhodamine B Dye ◽  
Test Result

The Nano- TiO 2/Diatomite compound photocatalyst is used to degrade rhodamine B dye wastewater in photochemical reactor. The test result indicates that the rate of photodegradation of rhodamine B is influenced by reactive conditions. The best technical conditions are concentration of rhodamine B solution 10mg/L, ultraviolet light 300W, the compound photocatalyst amount used 1g/L, the pH 5.8, reaction time 20min. Under these conditions the rate of photodegradation of rhodamine B may reach as high as 97.80%. And the efficiency of photodegradation of catalyst only has a little changed in recycling.

Preparation of Nano-TiO2 and Performance Study on Photocatalytic Degradation of Methylene Blue

2012 ◽  
Vol 430-432 ◽  
pp. 1040-1043
Author(s):  
Jiang Liu ◽  
Zheng Xian Ma ◽  
Shuai Liang
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Degradation ◽  
Ph Value ◽  
Raw Material ◽  
Dye Wastewater ◽  
Performance Study ◽  
Water Addition ◽  
Nano Tio2 ◽  
Blue Solution ◽  
And Performance

Experiment of photocatalytic degradation was conducted through using tetra-n-butyl titanate and ethyl alcohol as raw material, adopting sol-gol method to prepare photocatalyst of nano-TiO2 and using methylene blue solution as analogue dye wastewater. The influences of hydrolyzing temperature, PH value, different water addition, and different speed of adding drops were investigated, as well as the reuse rate of photocatalyst.

The use of waste SNCR catalysts to produce a nano-TiO2 photo-catalyst and to degrade wastewater from the dye making industry

2018 ◽  
Vol 79 (4) ◽  
pp. 789-797
Author(s):  
Yenchun Liu ◽  
Chengyu Tsai ◽  
Robert Lianhuey Liu
Keyword(s):  
Electron Microscopy ◽  
Inductively Coupled Plasma ◽  
Energy Dispersive Spectrometry ◽  
Catalytic Reduction ◽  
Dye Wastewater ◽  
X Ray Diffraction ◽  
Nano Tio2 ◽  
Photo Catalyst ◽  
Inductively Coupled ◽  
Transmission Electron

Abstract This study recycles titanium dioxide (TiO2) that is contained in waste selective non-catalytic reduction (SNCR) catalysts using acid or alkali. The waste SNCR is then filtered, baked, ground and calcined to form a photo-catalytic powder. The nano-TiO2 photo-catalysts that are obtained using both processes are then tested and compared. The two TiO2 photo-catalysts that are produced from waste SNCR catalysts have a diameter of 30–40 nm. Energy dispersive spectrometry (EDS) and inductively coupled plasma (ICP) are used to determine the elemental composition of TiO2 and X-ray diffraction (XRD) is used to determine the crystalline phase. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) are used to determine the surface morphology, the structure and the particle size. The effect of placing porous TiO2 in a suspension is also determined. This study demonstrates the production of a photo-catalyst from an SNCR catalyst and its effect in advanced oxidation processes (AOP). When everdirect supra turquoise blue (FBL) dye wastewater is degraded in the presence of ultraviolet (UV) /TiO2, more than 90% of the total oxidizable carbon (TOC) is removed.

Selection of the Area of Window Openings of Residential Buildings in Conditions of Monsoon Climate of the Far East of the Russian Federation and Northern Areas of China

2019 ◽  
pp. 27-33
Author(s):  
Aleksei K. Solovyov ◽  
Bi Guofu
Keyword(s):  
Residential Buildings ◽  
Russian Far East ◽  
Far East ◽  
Heat Losses ◽  
Natural Light ◽  
Monsoon Climate ◽  
Northern Areas ◽  
Artificial Illumination ◽  
Heat Penetration ◽  
Large Heat

The term “window” in architecture usually stands for an opening in a wall or roof for penetration of natural light, sunrays and fresh air in premises. Recently, the requirement of contact with environment is added to this condition. It is especially relevant for residential buildings where rooms are considered residential if they have windows. The energy consumption of a building depends on sizes, form and location of windows. In winter, windows cause huge heat losses, in summer, on the other hand, large heat enters a building via the windows and is required to be removed by means of air conditioning. Moreover, windows are used for penetration of natural light in premises, which assists in saving of large amounts of power for artificial illumination. This article discusses partial solving the problem of the energy efficiency of residential buildings by determining the most efficient area of windows in terms of energy spending for compensation of heat losses via windows in winter, elimination of heat penetration through them in summer and energy losses for artificial lighting throughout the year. The analysis of the results of calculation of power consumption for residential premises in conditions of monsoon climate of the Russian Far East and Northern areas of China (PRC) is provided.

Review of the Current State and Future Development in Standardizing Natural Lighting in Interiors

2018 ◽  
pp. 5-26 ◽  
Author(s):  
Stanislav Darula
Keyword(s):  
Human Life ◽  
Natural Light ◽  
Artificial Lighting ◽  
Computer Tools ◽  
Natural Lighting ◽  
Current State ◽  
Minimum Requirements ◽  
Life On Earth ◽  
Window Design

Three elements mainly wind, water and sun seemed to determine in ancient ages the basic phenomena of life on Earth. Architectural history documented the importance of sun influence on urban and building construction already in layouts of Mesopotamian and Greek houses. Not only sun radiation but especially daylight played a significant role in the creation of indoor environment. Later, in the 20th century, a search of interaction between human life in buildings and natural conditions were studied considering well­being and energy conscious design recently using computer tools in complex research and more detail interdisciplinary solutions. At the same time the restricted daytime availability of natural light was supplemented by more efficient and continually cheaper artificial lighting of interiors. There are two main approaches to standardize the design and evaluation of indoor visual environment. The first is based on the determination of the minimum requirements respecting human health and visibility needs in all activities while the second emphasizes the behaviour and comfort of occupants in buildings considering year­around natural changes of physical quantities like light, temperature, noise and energy consumption. The new current standardization basis for daylight evaluation and window design criteria stimulate the study of methodology principles that historically were based on the overcast type of sky luminance pattern avoiding yearly availability of sky illuminance levels. New trends to base the daylight standardization on yearly or long­term availability of daylight are using the averages or median sky illuminance levels to characterise local climatological conditions. This paper offers the review and discussion about the principles of the natural light standardization with a short introduction to the history and current state, with a trial to focus on the possible development of lighting engineering and its standards in future.

Dynamics of the macromolecular composition of the biomass of microalgae in the morning under natural light. Model

2020 ◽  
pp. 45-52
Author(s):  
Alexander S. Lelekov ◽  
Anton V. Shiryaev
Keyword(s):  
Biochemical Composition ◽  
Initial Conditions ◽  
Natural Light ◽  
Photoautotrophic Growth ◽  
Structural Part ◽  
Basic Model ◽  
Microalgae Culture ◽  
Simulation Results ◽  
Structural Parts ◽  
Macromolecular Composition

The work is devoted to modeling the growth of optically dense microalgae cultures in natural light. The basic model is based on the idea of the two-stage photoautotrophic growth of microalgae. It is shown that the increase in the intensity of sunlight in the first half of the day can be described by a linear equation. Analytical equations for the growth of biomass of microalgae and its macromolecular components are obtained. As the initial conditions, it is assumed that at the time of sunrise, the concentration of reserve biomass compounds is zero. The simulation results show that after sunrise, the growth of the microalgae culture is due only to an increase in the reserve part of the biomass, while the structural part practically does not change over six hours. Changes in the ratio of the reserve and structural parts of the biomass indicate a change in the biochemical composition of cells.

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