Removal of Gas-Phase Elemental Mercury by Photocatalytic with Liquid Absorption

2012 ◽  
Vol 424-425 ◽  
pp. 430-434 ◽  
Author(s):  
Jie He Chen ◽  
Min Yu Sun ◽  
Jiang Wu ◽  
Ping He ◽  
Wei Guo Pan ◽  
...  
Keyword(s):  
Titanium Dioxide ◽  
Removal Efficiency ◽  
Uv Irradiation ◽  
Positive Impact ◽  
Elemental Mercury ◽  
Mercury Removal ◽  
Experimental Conditions ◽  
Removal Time ◽  
Degussa P25 ◽  
Nano Titanium Dioxide

In order to study the influence of UV irradiation, treat temperature of nano-titanium dioxide and intensity of UV irradiation on the mercury removal performance, experiments were carried out on a photocatalytic oxidization system to find the best experimental conditions. Commercial Degussa P25 was used as a photocatalyst loading on titanium mesh, and the mercury removal efficiency was stable at 8% in the absence of UV irradiation. Under the UV irradiation of 300W mercury lamp, the mercury removal efficiency surged to 100%. With the same light intensity, the same removal time, the mercury removal efficiency of nano-titanium dioxide calcinated at 100°C reached 92.2% after 0.5h while the mercury removal efficiency of nano-titanium dioxide calcinated at 500°C reached 93.6%. Intensity of UV irradiation has a positive impact on the mercury removal performance.

Experimental Study on Titanium Based Photocatalyst and its Catalytic Oxidation on Flue Gas Mercury

2012 ◽  
Vol 252 ◽  
pp. 293-297
Author(s):  
Xue Shi ◽  
Xue Wei Dai ◽  
Jiang Wu ◽  
Xian Li ◽  
Yi Ran Zhang ◽  
...  
Keyword(s):  
Catalytic Oxidation ◽  
Removal Efficiency ◽  
Flue Gas ◽  
Photocatalytic Oxidation ◽  
Elemental Mercury ◽  
Mercury Removal ◽  
Mass Ratio ◽  
Photo Catalytic Oxidation ◽  
Iron Doped ◽  
Oxidation System

This paper mainly studied the effects of different iron-doped volume on photo-catalytic oxidation of TiO2 for mercury removal. Through the photocatalytic oxidation system, we evaluated the elemental mercury removal performance of TiO2 with iron-doped mass ratio of 0.5%, 1%, 2% and 3%. While the iron-doped mass ratio were 0.5%, 1%, 2% and 3%, the elemental mercury removal efficiency were 70.83%，52.89%，72.32% and 62.39% respectively, the removal efficiency increased firstly, then declined, and 2% iron-doped was the most appropriate

scholarly journals Removal of Elemental Mercury from Flue Gas using the Magnetic Attapulgite by Mn-Cu Oxides Modification

2021 ◽  
Author(s):  
Yifei Long ◽  
Zhong He ◽  
Xiaoyi Li ◽  
Yajie Yin ◽  
Yuan Wang ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Flue Gas ◽  
Active Sites ◽  
Chemical Properties ◽  
Elemental Mercury ◽  
Mercury Removal ◽  
Impregnation Method ◽  
Active Components ◽  
Co Precipitation ◽  
Physical And Chemical

Abstract Mercury pollution has become one of the most concerned environmental issues in the world because of its high toxicity, non-degradability and bioaccumulation. Attapulgite adsorbents modified by magnetic manganese-copper (MnxCuy-MATP) were fabricated by co-precipitation and ultrasonic impregnation method,aiming at removing Hg0 from coal-fired flue gas. BET, SEM, XRD, VSM and XPS were used to systematically explore the physical and chemical properties of the adsorbents, the effects of manganese and copper additions, reaction temperature and various components in the flue gas on the efficiency of Hg0 removal were investigated. Mn8Cu5-MATP exhibited the optimal properties, and excessive copper loadings led to the aggregation of the active components. The efficiency of mercury removal can be effectively improved by NO and HCl regardless of the absence and presence of O2, because the NO+, NO3, NO2 and Cl* produced during the reaction can promote the adsorption and oxidation of Hg0. SO2 and H2O inhibited the oxidation of Hg0 because of the competitive adsorption at the active sites, while a large amount of sulfite and sulfate were formed to block the pores. However, the introduction of copper caused the sample to obtain SO2 resistance, which resulted in a mercury removal efficiency of 84.3% even under 1500 ppm SO2. In addition, after 5 cycles of adsorption and regeneration, Mn8Cu5-MATP can still maintain excellent Hg0 removal ability. The fabricated adsorbent can save the actual production cost and effectively improve the mercury removal efficiency in sulfur-containing flue gas.

The Study on the Performance of Wet Limestone-Gypsum Flue Gas Mercury Removal Additive

2013 ◽  
Vol 448-453 ◽  
pp. 608-612
Author(s):  
Li Bao Yin ◽  
Qi Sheng Xu ◽  
Jiang Jun Hu ◽  
Yang Heng Xiong ◽  
Si Wei Chen
Keyword(s):  
Removal Efficiency ◽  
Flue Gas ◽  
Total Mercury ◽  
Elemental Mercury ◽  
Flue Gas Desulfurization ◽  
Mercury Removal ◽  
Additive Increase ◽  
Calcium Sulfite

The influences on the performance of wet flue gas desulfurization system in mercury removing after adding mercury removal additive were studied. As a consequence, the mercury removal efficiency can be improved by this kind of additive, that the efficiency of elemental mercury and total mercury is raised along with the amount of additive is increased. And so can the desulfuration efficiency. The oxidation of calcium sulfite in desulfurization is promoted by the mercury removal additive, increase the reduce speed of calcium sulfite concentration.

Preparation of SiO2–TiO2 Nanocomposite and Its Application on Elemental Mercury Removal in Simulated Flue Gas

2014 ◽  
Vol 960-961 ◽  
pp. 456-461
Author(s):  
Xue Shi ◽  
Bu Ni ◽  
Chao En Li ◽  
Xian Li ◽  
Chong Zhang ◽  
...  
Keyword(s):  
Removal Efficiency ◽  
Flue Gas ◽  
Low Cost ◽  
Physical Method ◽  
Elemental Mercury ◽  
Mercury Removal ◽  
Photocatalytic Ability ◽  
Absorption Of Light ◽  
Nanocomposite Catalyst ◽  
Direct Adsorption

SiO2–TiO2 nanocomposite was synthesized by an ultrasound-assisted pure physical method to oxidize elemental mercury (Hg0) in simulated flue gas. Due to its low cost and photocatalytic ability, SiO2 was used to dope TiO2 to modify the TiO2 photocatalyst. We put different ratio of TiO2 / SiO2 under the UV irradiation to get a low Ti/Si doping ratio and high flue gas mercury removal efficiency of SiO2–TiO2 nanocomposite catalyst. It was found that the photocatalytic activity of nanocomposite materials did not significantly improve, or even decline. This is mainly because that the presence of too much porous SiO2 may affect TiO2 on the effective absorption of light and direct adsorption of contaminants. When Ti: Si ratio was 2:1, SiO2–TiO2 nanocomposite catalyst reached its highest elemental mercury removal efficiency in the simulated flue gas.

Removal of elemental mercury using titania sorbents loaded with cobalt ceria oxides from syngas

2018 ◽  
Vol 42 (15) ◽  
pp. 12503-12510 ◽  
Author(s):  
Xueqian Li ◽  
Jinsong Zhou ◽  
Qixin Zhou ◽  
Juezhen Mao
Keyword(s):  
Low Temperature ◽  
Removal Efficiency ◽  
Elemental Mercury ◽  
Mercury Removal ◽  
High Mercury

A novel CexCoyTi sorbent was synthesized, which exhibited high mercury removal efficiency at low temperature.

Development and production experience of the multilayer curtain-coated linerboard of Ji’an PM No. 3,

TAPPI Journal ◽  
2014 ◽  
Vol 13 (2) ◽  
pp. 17-25
Author(s):  
JUNMING SHU ◽  
ARTHAS YANG ◽  
PEKKA SALMINEN ◽  
HENRI VAITTINEN
Keyword(s):  
Titanium Dioxide ◽  
High Speed ◽  
Food Packaging ◽  
Production Efficiency ◽  
Positive Impact ◽  
Low Cost ◽  
Board Structure ◽  
Flexographic Printing ◽  
Curtain Coating ◽  
Coating Formulations

The Ji’an PM No. 3 is the first linerboard machine in China to use multilayer curtain coating technology. Since successful startup at the end of 2011, further development has been carried out to optimize running conditions, coating formulations, and the base paper to provide a product with satisfactory quality and lower cost to manufacture. The key challenges include designing the base board structure for the desired mechanical strength, designing the surface properties for subsequent coating operations, optimizing the high-speed running of the curtain coater to enhance production efficiency, minimizing the amount of titanium dioxide in the coating color, and balancing the coated board properties to make them suitable for both offset and flexographic printing. The pilot and mill scale results show that curtain coating has a major positive impact on brightness, while smoothness is improved mainly by the blade coating and calendering conditions. Optimization of base board properties and the blade + curtain + blade concept has resulted in the successful use of 100% recycled fiber to produce base board. The optical, mechanical, and printability properties of the final coated board meet market requirements for both offset and flexographic printing. Machine runnability is excellent at the current speed of 1000 m/min, and titanium dioxide has been eliminated in the coating formulations without affecting the coating coverage. A significant improvement in the total cost of coated white liner production has been achieved, compared to the conventional concept of using virgin fiber in the top ply. Future development will focus on combining low cost with further quality improvements to make linerboard suitable for a wider range of end-use applications, including frozen-food packaging and folding boxboard.

Synthesis of Functionalized Magnetite Titanium Dioxide Nanocomposite for Removal of Acid Fuchsine Dye

2018 ◽  
Vol 21 (8) ◽  
pp. 583-593 ◽  
Author(s):  
Sara Rahnama ◽  
Shahab Shariati ◽  
Faten Divsar
Keyword(s):  
Titanium Dioxide ◽  
Removal Efficiency ◽  
Magnetic Core ◽  
Fractional Factorial ◽  
Order Kinetic ◽  
Sorption Data ◽  
Salt Addition ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
Ft Ir

Objective: In this research, a novel magnetite titanium dioxide nanocomposite functionalized by amine groups (Fe3O4@SiO2@TiO2-NH2) was synthesized and its ability for efficient removal of Acid Fuchsine as an anionic dye from aqueous solutions was investigated. Method: The core-shell structure of Fe3O4@SiO2@TiO2 was prepared using Fe3O4 as magnetic core, tetra ethyl orthosilicate as silica and tetra butyl titanate as titanium source for shell. The synthesized nanocomposites (particle size lower than 44 nm) were characterized by FT-IR, XRD, DRS, SEM and TGA instruments. The various experimental parameters affecting dye removal efficiency were investigated and optimized using Taguchi fractional factorial design. Results: The synthesized adsorbent showed the highest removal efficiency of Acid Fuchsine (99 %) at pH= 3.5, without salt addition and during stirring at contact times less than 10 minutes. The study of kinetic models at two concentration levels showed the fast dye sorption on the surface of proposed nanocomposites with pseudo second order kinetic model (R2=1). Also, the fitting of Acid Fuchsine sorption data to Freundlich, Langmuir and Temkin isotherms suggested that Freundlich model gave a better fitting than other models (R2=0.9936, n=2). Conclusion: Good chemical stability, excellent magnetic properties, very fast adsorption kinetics and high removal efficiency make the synthesized nanocomposite as a proper recoverable sorbent for removal of Acid Fuchsine dye from wastewaters.

scholarly journals Low-Cost Organic Adsorbents for Elemental Mercury Removal from Lignite Flue Gas

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2174
Author(s):  
Marta Marczak-Grzesik ◽  
Stanisław Budzyń ◽  
Barbara Tora ◽  
Szymon Szufa ◽  
Krzysztof Kogut ◽  
...  
Keyword(s):  
Flue Gas ◽  
Low Cost ◽  
Elemental Mercury ◽  
Mercury Content ◽  
Flue Gases ◽  
Mercury Removal ◽  
Gas Purification ◽  
Gas Temperature ◽  
Corn Straw ◽  
Flue Gas Purification

The research presented by the authors in this paper focused on understanding the behavior of mercury during coal combustion and flue gas purification operations. The goal was to determine the flue gas temperature on the mercury emissions limits for the combustion of lignites in the energy sector. The authors examined the process of sorption of mercury from flue gases using fine-grained organic materials. The main objectives of this study were to recommend a low-cost organic adsorbent such as coke dust (CD), corn straw char (CS-400), brominated corn straw char (CS-400-Br), rubber char (RC-600) or granulated rubber char (GRC-600) to efficiently substitute expensive dust-sized activated carbon. The study covered combustion of lignite from a Polish field. The experiment was conducted at temperatures reflecting conditions inside a flue gas purification installation. One of the tested sorbents—tire-derived rubber char that was obtained by pyrolysis—exhibited good potential for Hg0 into Hg2+ oxidation, resulting in enhanced mercury removal from the flue. The char characterization increased elevated bromine content (mercury oxidizing agent) in comparison to the other selected adsorbents. This paper presents the results of laboratory tests of mercury sorption from the flue gases at temperatures of 95, 125, 155 and 185 °C. The average mercury content in Polish lignite was 465 μg·kg−1. The concentration of mercury in flue gases emitted into the atmosphere was 17.8 µg·m−3. The study analyzed five low-cost sorbents with the average achieved efficiency of mercury removal from 18.3% to 96.1% for lignite combustion depending on the flue gas temperature.

A comparative study on the efficacy of different probes to predict the photo-activity of nano-titanium dioxide toward biomolecules

RSC Advances ◽  
2015 ◽  
Vol 5 (109) ◽  
pp. 89559-89568 ◽  
Author(s):  
A. Marucco ◽  
E. Carella ◽  
I. Fenoglio
Keyword(s):  
Titanium Dioxide ◽  
Comparative Study ◽  
Systematic Study ◽  
Living Organisms ◽  
Nano Titanium Dioxide

A systematic study has been performed to select cell-free tests able to predict the photo-activity of nano-TiO2 in living organisms.

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