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Full-Text Articles in Physical Sciences and Mathematics
Comparative Study Of Interaction Between Pyrite And Cysteine By Thermogravimetric And Electrochemical Techniques, Zhaohui Wang, Xuehui Xie, Shengmu Xiao, Jianshe Liu
Comparative Study Of Interaction Between Pyrite And Cysteine By Thermogravimetric And Electrochemical Techniques, Zhaohui Wang, Xuehui Xie, Shengmu Xiao, Jianshe Liu
Dr Zhaohui Wang
Adsorption mechanism of l-cysteine on pyrite was investigated by thermogravimetric and electrochemical techniques. TG curves provided the direct evidence for chemisorption of cysteine on pyrite surface. Once cysteine adsorbed to pyrite surface, Ecorr (corrosion potential) sharply lowered whereas Icorr (corrosion current) increased rapidly. Pyrite became more susceptible to be oxidized even at lower potential as cysteine was added. However, the mechanism for pyrite oxidation does not fundamentally change, although cysteine can obviously accelerate oxidation rate of pyrite. These findings have important implications for understanding the mechanism of bacterial adhesion to pyrite and even metal sulfide bioleaching.
Adsorption Behavior Of Glucose On Pyrite Surface Investigated By Tg, Ftir And Xrd Analyses, Zhaohui Wang, Xuehui Xie, Shengmu Xiao, Jianshe Liu
Adsorption Behavior Of Glucose On Pyrite Surface Investigated By Tg, Ftir And Xrd Analyses, Zhaohui Wang, Xuehui Xie, Shengmu Xiao, Jianshe Liu
Dr Zhaohui Wang
The interaction of glucose with pyrite has been investigated by a series of surface analyses, such as amounts adsorbed, TG, FTIR and XRD measurements. The adsorption experiment reveals that glucose would rapidly adsorb on the pyrite surface within 60 min. However, physical adhesion characterized as multi-molecular layer adsorption may occur based on adsorption isotherm type. All results obtained by TG and FTIR suggest that no adsorption took place after several times of washing. XRD results indicate that crystal structure of pyrite was not obviously destructed after glucose was added. The interplane distances of (111), (400) after interaction between glucose and …
Climate Change: A Frontier For Acid Sulfate Soil Research, Richard Bush, Leigh Sullivan, Scott Johnston, Edward Burton, Vanessa Wong, Annabelle Keene
Climate Change: A Frontier For Acid Sulfate Soil Research, Richard Bush, Leigh Sullivan, Scott Johnston, Edward Burton, Vanessa Wong, Annabelle Keene
Associate Professor Edward D Burton
Sea-level is predicted to continue to rise this century, threatening the integrity of coastal floodplains throughout the world. The low-lying elevation of much of the 17 million ha of acid-sulfate soils that occur worldwide, renders these landscapes particularly vulnerable to the impacts of climate change. Acid sulfate soils landscapes are regulated by redox driven biogeochemical processes that are sensitive to watertable dynamics, tidal exchange and temperature. The increased likelihood of extreme weather events such as drought and floods and rising global temperatures are directly relevant to the redox and hydrological processes that influence acid sulfate soil behaviour and their impact …