【摘 要】
：
In this study,the degradation efficiencies of zero-valent iron (ZVI) powders with different structures and components were evaluated for methyl orange (MO).The results show that the structure is an essential factor that affects degradation,and added non-m
【机 构】
：
Shenzhen Key Laboratory of Special Functional Materials and Shenzhen Engineering Laboratory for Adva
论文部分内容阅读
In this study,the degradation efficiencies of zero-valent iron (ZVI) powders with different structures and components were evaluated for methyl orange (MO).The results show that the structure is an essential factor that affects degradation,and added non-metallic elements help optimize the structure.The amorphous and balled-milled crystalline Fe70Si10B20 has comparative degradation efficiencies to MO with t1/2 values of 6.9 and 7.0 min,respectively.Increasing the boron content can create a favorable structure and promote degradation.The ball-milled crystalline Fe70B30 and Fe43.64B56.36 powders have relatively short t1/2 values of 5.2 and 3.3 min,respectively.The excellent properties are mainly attributed to their heterogeneous structure with boron-doped active sites in ZVI.Composition segregation in the nanoscale range in an amorphous FeSiB alloy and small boron particles in the microscale range embedded in large iron particles prepared by ballmilling,both constitute effective galvanic cells that promote iron electron loss and therefore decompose organic chemicals.These findings may provide a new,highly efficient,low-cost commercial method for azo dye wastewater treatment using ZVI.
其他文献
The precipitation characteristics and mechanism of vanadium carbides during isothermal transformation at 650 ℃ in a V-microalloyed medium-carbon steel were investigated through scanning electron microscopy and transmission electron microscopy as well as d
Perovskite BaTiO3 (BTO) nanocrystals with a size of 150-200 nm have successfully been synthesized via a facile hydrothermal method by employing titanate nanowires as synthetic precursor.Tetragonality and spontaneous ferroelectric polarization of BTO nanoc
The σ-phase precipitation in 20％ cold-worked 15Cr-15Ni titanium-modified austenitic stainless steel was studied during long-term aging treatment.During the isothermal aging stage,the amount of σ-phase was significantly increased at beginning and gradually
It has been widely demonstrated that addition of Ni in low-carbon steels can effectively improve the cryogenic toughness,but the mechanism behind it has yet to be clarified.In the present work,the evolutions of microstructure and mechanical properties aft
2.98 kGy/h (1007 h) gamma irradiation and 90 ℃ (2000 h) thermal aging were exerted to X65 grade low carbon steel buried in Gaomiaozi bentonite containing 17 wt％ Beishan groundwater.The average corrosion rate of X65 low carbon steel was measured.The elemen
The effect of electropulsing on the mechanical behaviors and microstructures of Ti-6Al-4V titanium alloy was investigated by an uniaxial tensile test.Compared to the value measured in cold tensile test,the alloy exhibits lower ultimate tensile strength wh
Despite the economy of material cost and excellent toughness of Cu-based amorphous alloys,especially Cu5oZr5o,their poor corrosion resistance to a chloride medium limits their widespread applications.In this study,corrosion tests were performed on the Cu5
The hot deformation characteristics and the corrosion behavior of a high-strength low-alloy (HSLA) steel were investigated at deformation temperatures ranging from 800 to 1100 ℃ and strain rates ranging from 0.1 to 10 s-1 using an MMS-200 thermal simulati
The tensile tests of AZ31 magnesium alloy were carried out under room temperature,100,150 and 200 ℃ with and without pulse current.The effect of temperature on dynamic recrystallization (DRX) of AZ31 alloy was studied at different conditions.One-parameter
The voltage was recorded to investigate the influence of the static magnetic field on droplet evolution during the magnetically controlled electroslag remelting (MC-ESR) process.MC-ESR experiments were carried out under different remelting current,and tra