The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform
Jun Xiang - One of the best experts on this subject based on the ideXlab platform.
-
Enhanced capture of Elemental Mercury by bamboo-based sorbents.
Journal of Hazardous Materials, 2012Co-Authors: Zeng-qiang Tan, Jun Xiang, Hancai Zeng, Changsong Zhou, Lushi Sun, Jianrong QiuAbstract:Abstract To develop cost-effective sorbent for gas-phase Elemental Mercury removal, the bamboo charcoal (BC) produced from renewable bamboo and KI modified BC (BC-I) were used for Elemental Mercury removal. The effect of NO, SO 2 on gas-phase Hg 0 adsorption by KI modified BC was evaluated on a fixed bed reactor using an online Mercury analyzer. BET surface area analysis, temperature programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS) were used to determine the pore structure and surface chemistry of the sorbents. The results show that KI impregnation reduced the sorbents’ BET surface area and total pore volume compared with that of the original BC. But the BC-I has excellent adsorption capacity for Elemental Mercury at a relatively higher temperature of 140 °C and 180 °C. The presence of NO or SO 2 could inhibit Hg 0 capture, but BC-I has strong anti-poisoning ability. The specific reaction mechanism has been further analyzed.
-
preparation and characterization of fe2o3 sio2 composite and its effect on Elemental Mercury removal
Chemical Engineering Journal, 2012Co-Authors: Zeng-qiang Tan, Jianrong Qiu, Fanhai Kong, Zean Wang, Fang Hao, Jun XiangAbstract:Abstract The Fe 2 O 3 –SiO 2 composite (FS) with high specific surface area and pore volume was successfully synthesized using sol–gel method. BET surface area analysis, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), thermal gravity analysis (TGA), temperature programmed desorption (TPD) were used to characterize the catalyst. The performance of prepared FS for Elemental Mercury removal was evaluated under simulated flue gas. This study identified the effective temperature range (80–450 °C) for Elemental Mercury removal, with the optimal temperature of 350 °C. A high SO 2 (>1500 ppm) concentration is not conducive to Elemental Mercury removal by FS catalyst. The removal mechanism has been discussed based on the experimental and analytical results.
-
Preparation and characterization of Fe2O3–SiO2 composite and its effect on Elemental Mercury removal
Chemical Engineering Journal, 2012Co-Authors: Zeng-qiang Tan, Jianrong Qiu, Fanhai Kong, Zean Wang, Fang Hao, Jun XiangAbstract:Abstract The Fe 2 O 3 –SiO 2 composite (FS) with high specific surface area and pore volume was successfully synthesized using sol–gel method. BET surface area analysis, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), thermal gravity analysis (TGA), temperature programmed desorption (TPD) were used to characterize the catalyst. The performance of prepared FS for Elemental Mercury removal was evaluated under simulated flue gas. This study identified the effective temperature range (80–450 °C) for Elemental Mercury removal, with the optimal temperature of 350 °C. A high SO 2 (>1500 ppm) concentration is not conducive to Elemental Mercury removal by FS catalyst. The removal mechanism has been discussed based on the experimental and analytical results.
-
Removal of Elemental Mercury by bamboo charcoal impregnated with H2O2
Fuel, 2011Co-Authors: Zeng-qiang Tan, Hao Liu, Hancai Zeng, Jianrong Qiu, Jun XiangAbstract:Abstract Mercury emission from coal combustion is an increasing environmental concern due to its high volatility and toxicity, and activated carbon (AC) adsorption has been proven an effective Mercury-control method, with high-cost limit. The renewable bioresource of bamboo constitutes an important precursor for activated carbon, and the bamboo charcoal (BC) may act as low-cost sorbent used in the Mercury-control. The adsorptive potential of BC and modified BC using H2O2 for Elemental Mercury was investigated for the first time through a parametric study conducted with a bench-scale bed. The effects of pore structure and surface chemistry were investigated based on BET, XPS. Which suggest that BC materials have excellent adsorption potential for Elemental Mercury, especially after modified by H2O2. The modification using H2O2 altered the physical and chemical properties of BC materials, making the sorbents more effective in Mercury adsorption even at a relative higher temperature, and the enhancing-effect was more obvious with increasing H2O2.
Zeng-qiang Tan - One of the best experts on this subject based on the ideXlab platform.
-
Removal Characteristics of Elemental Mercury by Mn-Ce/molecular Sieve
Huan jing ke xue= Huanjing kexue, 2015Co-Authors: Zeng-qiang Tan, Guo-ping Niu, Xiao-wen Chen, An ZhenAbstract:The impregnation method was used to support molecular sieve with active manganese and cerium components to obtain a composite molecular sieve catalyst. The Mercury removal performance of the catalyst was studied with a bench-scale setup. XPS analysis was used to characterize the sample before and after the modification in order to study the changes in the active components of the catalyst prepared. The results showed that the catalyst carrying manganese and cerium components had higher oxidation ability of Elemental Mercury in the temperature range of 300 degrees C - 450 degrees C, especially at 450 degrees C, the oxidation efficiency of Elemental Mercury was kept above 80%. The catalyst had more functional groups that were conducive to the oxidation of Elemental Mercury, and the Mercury removal mainly depended on the chemical adsorption. The SO2 and NO in flue gas could inhibit the oxidation of Elemental Mercury to certain extent.
-
Removal of Elemental Mercury by modified bamboo carbon
Chinese Journal of Chemical Engineering, 2015Co-Authors: Zeng-qiang Tan, Guo-ping Niu, Xiao-wen ChenAbstract:Abstract The Mercury removal performance of modified bamboo charcoal (BC) was investigated with a bench-scale fixed-bed reactor. A simple impregnation method was used to modify the BC with ZnCl 2 and FeCl 3 separately. BET and XPS were used to determine the pore structure and surface chemistry of the sorbents. The role of Fe 3 + in the removal of Elemental Mercury by modified sorbents was discussed. The experimental results suggest that the modified BCs have excellent adsorption potential for Elemental Mercury at a relatively higher temperature, 140 °C. The BET surface area and average pore size of modified sorbents do not show noticeable priority compared to unmodified BC. XPS spectra indicate that Fe atoms mainly exist in the form of Fe 3 + for the FeCl 3 -impregnated BC. Better performance of FeCl 3 -impregnated BC at different temperatures (20, 140 and 180 °C) suggests the enhancement of non-chloride functional groups (Fe 3 + ). Inhibition effect of SOx and NO for Hg 0 removal by BC samples is present in the study.
-
Enhanced capture of Elemental Mercury by bamboo-based sorbents.
Journal of Hazardous Materials, 2012Co-Authors: Zeng-qiang Tan, Jun Xiang, Hancai Zeng, Changsong Zhou, Lushi Sun, Jianrong QiuAbstract:Abstract To develop cost-effective sorbent for gas-phase Elemental Mercury removal, the bamboo charcoal (BC) produced from renewable bamboo and KI modified BC (BC-I) were used for Elemental Mercury removal. The effect of NO, SO 2 on gas-phase Hg 0 adsorption by KI modified BC was evaluated on a fixed bed reactor using an online Mercury analyzer. BET surface area analysis, temperature programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS) were used to determine the pore structure and surface chemistry of the sorbents. The results show that KI impregnation reduced the sorbents’ BET surface area and total pore volume compared with that of the original BC. But the BC-I has excellent adsorption capacity for Elemental Mercury at a relatively higher temperature of 140 °C and 180 °C. The presence of NO or SO 2 could inhibit Hg 0 capture, but BC-I has strong anti-poisoning ability. The specific reaction mechanism has been further analyzed.
-
preparation and characterization of fe2o3 sio2 composite and its effect on Elemental Mercury removal
Chemical Engineering Journal, 2012Co-Authors: Zeng-qiang Tan, Jianrong Qiu, Fanhai Kong, Zean Wang, Fang Hao, Jun XiangAbstract:Abstract The Fe 2 O 3 –SiO 2 composite (FS) with high specific surface area and pore volume was successfully synthesized using sol–gel method. BET surface area analysis, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), thermal gravity analysis (TGA), temperature programmed desorption (TPD) were used to characterize the catalyst. The performance of prepared FS for Elemental Mercury removal was evaluated under simulated flue gas. This study identified the effective temperature range (80–450 °C) for Elemental Mercury removal, with the optimal temperature of 350 °C. A high SO 2 (>1500 ppm) concentration is not conducive to Elemental Mercury removal by FS catalyst. The removal mechanism has been discussed based on the experimental and analytical results.
-
Preparation and characterization of Fe2O3–SiO2 composite and its effect on Elemental Mercury removal
Chemical Engineering Journal, 2012Co-Authors: Zeng-qiang Tan, Jianrong Qiu, Fanhai Kong, Zean Wang, Fang Hao, Jun XiangAbstract:Abstract The Fe 2 O 3 –SiO 2 composite (FS) with high specific surface area and pore volume was successfully synthesized using sol–gel method. BET surface area analysis, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), thermal gravity analysis (TGA), temperature programmed desorption (TPD) were used to characterize the catalyst. The performance of prepared FS for Elemental Mercury removal was evaluated under simulated flue gas. This study identified the effective temperature range (80–450 °C) for Elemental Mercury removal, with the optimal temperature of 350 °C. A high SO 2 (>1500 ppm) concentration is not conducive to Elemental Mercury removal by FS catalyst. The removal mechanism has been discussed based on the experimental and analytical results.
L.w. Milian - One of the best experts on this subject based on the ideXlab platform.
-
sulfur polymer solidification stabilization of Elemental Mercury waste
Waste Management, 2002Co-Authors: M. Fuhrmann, D. Melamed, P. Kalb, J.w. Adams, L.w. MilianAbstract:Abstract Elemental Mercury, contaminated with radionuclides, presents a waste disposal problem throughout the Department of Energy complex. In this paper we describe a new process to immobilize Elemental Mercury wastes, including those contaminated with radionuclides, in a form that is non-dispersible, will meet EPA leaching criteria, and has low Mercury vapor pressure. In this stabilization and solidification process, Elemental Mercury is combined with an excess of powdered sulfur polymer cement (SPC) and sulfide additives in a mixing vessel and heated to ∼ 40 °C for several hours, until all of the Mercury is converted into mercuric sulfide (HgS). Additional SPC is then added and the temperature of the mixture raised to 135 °C, resulting in a molten liquid which is poured into a mold where it cools and solidifies. The final treated waste was characterized by powder X-ray diffraction and found to be a mixture of the hexagonal and orthorhombic forms of mercuric sulfide. The Toxicity Characteristic Leaching Procedure was used to assess Mercury releases, which for the optimized process averaged 25.8 μg/l, with some samples being well below the new EPA Universal Treatment Standard of 25 μg/l. Longer term leach tests were also conducted, indicating that the leaching process was dominated by diffusion. Values for the effective diffusion coefficient averaged 7.6×10 −18 cm 2 /s. Concentrations of Mercury vapor from treated waste in equilibrium static headspace tests averaged 0.6 mg/m 3 .
-
Sulfur polymer solidification/stabilization of Elemental Mercury waste.
Waste management (New York N.Y.), 2002Co-Authors: M. Fuhrmann, D. Melamed, P. Kalb, J.w. Adams, L.w. MilianAbstract:Abstract Elemental Mercury, contaminated with radionuclides, presents a waste disposal problem throughout the Department of Energy complex. In this paper we describe a new process to immobilize Elemental Mercury wastes, including those contaminated with radionuclides, in a form that is non-dispersible, will meet EPA leaching criteria, and has low Mercury vapor pressure. In this stabilization and solidification process, Elemental Mercury is combined with an excess of powdered sulfur polymer cement (SPC) and sulfide additives in a mixing vessel and heated to ∼ 40 °C for several hours, until all of the Mercury is converted into mercuric sulfide (HgS). Additional SPC is then added and the temperature of the mixture raised to 135 °C, resulting in a molten liquid which is poured into a mold where it cools and solidifies. The final treated waste was characterized by powder X-ray diffraction and found to be a mixture of the hexagonal and orthorhombic forms of mercuric sulfide. The Toxicity Characteristic Leaching Procedure was used to assess Mercury releases, which for the optimized process averaged 25.8 μg/l, with some samples being well below the new EPA Universal Treatment Standard of 25 μg/l. Longer term leach tests were also conducted, indicating that the leaching process was dominated by diffusion. Values for the effective diffusion coefficient averaged 7.6×10 −18 cm 2 /s. Concentrations of Mercury vapor from treated waste in equilibrium static headspace tests averaged 0.6 mg/m 3 .
Aruna Kulatunga - One of the best experts on this subject based on the ideXlab platform.
-
A rare case of self-injection of Elemental Mercury
BMC Research Notes, 2016Co-Authors: Singankutti Mudalige Thanuja Nilushi Priyangika, W. G. S. G. Karunarathna, Isurujith Liyanage, Methsala Gunawardana, Buddini Dissanayake, Sumeda Udumalgala, Chamith Rosa, Thilina Samarasinghe, Pravin Wijesinghe, Aruna KulatungaAbstract:Background Self-injection of Elemental Mercury is a rare finding especially in healthy people who are mentally sound. Early detection and removal of Mercury from the body by chelation and physical removal of a stored injected site is required to prevent long term toxicity. Case presentation A 15 year old previously healthy girl presented with an acute febrile illness with a generalized maculopapular skin rash for 3 days with a preceding history of self-injection of Mercury to both her forearms. This was an imitating experimental act influenced by a movie and she was mentally sound. Very high whole blood Mercury levels, x-rays of the forearms and histology confirmed Mercury poisoning. Conclusion Self-injection of Elemental Mercury can also occur in mentally sound people and rapid diagnosis and decontamination is required. This also signifies the importance of imposing limitations for visual media which could misguide minors and lead those to imitate and cause serious self-harm.
-
A rare case of self-injection of Elemental Mercury
BMC Research Notes, 2016Co-Authors: Singankutti Mudalige Thanuja Nilushi Priyangika, W. G. S. G. Karunarathna, Methsala Gunawardana, Buddini Dissanayake, Sumeda Udumalgala, Chamith Rosa, Thilina Samarasinghe, Pravin Wijesinghe, Isurujith Kongala Liyanage, Aruna KulatungaAbstract:Background Self-injection of Elemental Mercury is a rare finding especially in healthy people who are mentally sound. Early detection and removal of Mercury from the body by chelation and physical removal of a stored injected site is required to prevent long term toxicity.
Jianrong Qiu - One of the best experts on this subject based on the ideXlab platform.
-
Enhanced capture of Elemental Mercury by bamboo-based sorbents.
Journal of Hazardous Materials, 2012Co-Authors: Zeng-qiang Tan, Jun Xiang, Hancai Zeng, Changsong Zhou, Lushi Sun, Jianrong QiuAbstract:Abstract To develop cost-effective sorbent for gas-phase Elemental Mercury removal, the bamboo charcoal (BC) produced from renewable bamboo and KI modified BC (BC-I) were used for Elemental Mercury removal. The effect of NO, SO 2 on gas-phase Hg 0 adsorption by KI modified BC was evaluated on a fixed bed reactor using an online Mercury analyzer. BET surface area analysis, temperature programmed desorption (TPD) and X-ray photoelectron spectroscopy (XPS) were used to determine the pore structure and surface chemistry of the sorbents. The results show that KI impregnation reduced the sorbents’ BET surface area and total pore volume compared with that of the original BC. But the BC-I has excellent adsorption capacity for Elemental Mercury at a relatively higher temperature of 140 °C and 180 °C. The presence of NO or SO 2 could inhibit Hg 0 capture, but BC-I has strong anti-poisoning ability. The specific reaction mechanism has been further analyzed.
-
preparation and characterization of fe2o3 sio2 composite and its effect on Elemental Mercury removal
Chemical Engineering Journal, 2012Co-Authors: Zeng-qiang Tan, Jianrong Qiu, Fanhai Kong, Zean Wang, Fang Hao, Jun XiangAbstract:Abstract The Fe 2 O 3 –SiO 2 composite (FS) with high specific surface area and pore volume was successfully synthesized using sol–gel method. BET surface area analysis, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), thermal gravity analysis (TGA), temperature programmed desorption (TPD) were used to characterize the catalyst. The performance of prepared FS for Elemental Mercury removal was evaluated under simulated flue gas. This study identified the effective temperature range (80–450 °C) for Elemental Mercury removal, with the optimal temperature of 350 °C. A high SO 2 (>1500 ppm) concentration is not conducive to Elemental Mercury removal by FS catalyst. The removal mechanism has been discussed based on the experimental and analytical results.
-
Preparation and characterization of Fe2O3–SiO2 composite and its effect on Elemental Mercury removal
Chemical Engineering Journal, 2012Co-Authors: Zeng-qiang Tan, Jianrong Qiu, Fanhai Kong, Zean Wang, Fang Hao, Jun XiangAbstract:Abstract The Fe 2 O 3 –SiO 2 composite (FS) with high specific surface area and pore volume was successfully synthesized using sol–gel method. BET surface area analysis, X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), thermal gravity analysis (TGA), temperature programmed desorption (TPD) were used to characterize the catalyst. The performance of prepared FS for Elemental Mercury removal was evaluated under simulated flue gas. This study identified the effective temperature range (80–450 °C) for Elemental Mercury removal, with the optimal temperature of 350 °C. A high SO 2 (>1500 ppm) concentration is not conducive to Elemental Mercury removal by FS catalyst. The removal mechanism has been discussed based on the experimental and analytical results.
-
Removal of Elemental Mercury by bamboo charcoal impregnated with H2O2
Fuel, 2011Co-Authors: Zeng-qiang Tan, Hao Liu, Hancai Zeng, Jianrong Qiu, Jun XiangAbstract:Abstract Mercury emission from coal combustion is an increasing environmental concern due to its high volatility and toxicity, and activated carbon (AC) adsorption has been proven an effective Mercury-control method, with high-cost limit. The renewable bioresource of bamboo constitutes an important precursor for activated carbon, and the bamboo charcoal (BC) may act as low-cost sorbent used in the Mercury-control. The adsorptive potential of BC and modified BC using H2O2 for Elemental Mercury was investigated for the first time through a parametric study conducted with a bench-scale bed. The effects of pore structure and surface chemistry were investigated based on BET, XPS. Which suggest that BC materials have excellent adsorption potential for Elemental Mercury, especially after modified by H2O2. The modification using H2O2 altered the physical and chemical properties of BC materials, making the sorbents more effective in Mercury adsorption even at a relative higher temperature, and the enhancing-effect was more obvious with increasing H2O2.