Powder Slurry Research Articles

The expansion behavior of slurries containing recycled glass powder carboxymethyl cellulose, lime and aluminum powder

The rheology and foaming/expansion of the slurries of a waste/recycled glass powder with 50, 55 and 60 wt% of solid (glass powder) were experimentally investigated. The glass powder slurries were foamed using aluminum powder as foaming agent (0.75 wt%) and calcium hydroxide as activator (1 wt%). Sodium carboxymethyl cellulose (CMC) was added to the slurries as a binder with the amounts between 0 and 4 wt%. The expansions of the slurries were measured in-situ using a laser sensor and reported as percent volume expansion. The CMC-addition increased the viscosities of the slurries, particularly the fine size powder slurries. The slurries with the relatively low-viscosity exhibited lower initial expansion rates compared to the slurries with the relatively high-viscosity. The maximum expansions of the slurries increased from 300 to 350%, when the viscosity increased to 5 Pa s and reached a steady value around 400% between 5 and 50 Pa s. The expansions of the slurries could not be achieved above 50 Pa s since they became too thick to be foamed. The foam samples made from the slurries with 55 and 60 wt% of solid and sintered at 700 and 750 °C for 30 min had the average densities between 355 and 530 kg m−3 and the average compressive strengths between 0.2 and 0.5 MPa. Increasing sintering time to 60 min at 750 °C increased the average compressive strength from 0.5 to 1.5 MPa for the foam samples made from the slurry with 60 wt% of solid. These proved that both sintering temperature and time were effective in increasing the compressive strengths of the foamed structures. The thermal conductivities of the sintered foam samples with the densities of 355 and 504 kg m−3 were measured 0.042 and 0.057 W m−1 K−1, respectively.

Effect of Foreign Ion Substitution and Micropore Tuning in Robocasting Single-Phase Bioceramic Scaffolds on the Physicochemical Property and Vascularization.

The inorganic powder slurry extrusion printing technique known as robocasting is an interesting method to fabricate complex porous architectures whereby feedstocks containing organic binders and powders are printed and the resulting scaffolds are subjected to sintering. A major limiting factor of this technique is the simultaneous tailoring of vascularization efficacy and osteogenic activity, usually done by adding the secondary phase in the organic slurry before the writing step. Mechanical mixing of biphasic powders is required to avoid compromising the biological performance and physical defects caused by significantly different physicochemical properties. This study addresses this issue by developing a selective ion doping and microstructure tuning for the production of bioceramic scaffolds with a binozzle robocasting process. Different metal ions (Sr2+, Mg2+) were doped into wollastonite (CaSiO3; CSi) powders considering the mechanical stability and bioactive enhancement of the bioceramic scaffolds. Subsequently, the Mg-doped CSi slurries were used as shell-nozzle feedstocks added with 5, 10, and 15 μm diameter polystyrene microbeads that allowed shell-layer micropore production in pore struts during sintering. Finally, the most promising pore-strut microstructures and mechanical evolution of scaffolds were evaluated, and especially the enhanced fibrovascularization potential was confirmed in dorsal muscle embedding model in rabbits. This study may open an avenue to designing multiproperty-tuned macro- and microporous bioceramics for bone regenerative medicine, especially in challenging bone defect conditions.

Preparation and Characterization of An All Oxide Ceramic Matrix Composite by A Novel Method

Due to the characteristics of high temperature oxidation resistance and high reliability, all oxide composites are ideal materials for components in hot end of aeronautics and astronautics. In this paper, all oxide ceramic matrix composite(CMC) was prepared by a novel method which combined warm pressing of prepreg with PIP using polysilialumoxane as the precursor of mullite. The morphology, structure and mechanical properties of the all oxide CMC were characterized. The results show that polysilialumoxane with a ceramic yield of 53wt%can be completely changed to ceramic at 1200°C and form mullite crystals. The composite with alumina and mullite matrix derived from alumina powder slurry indicated the best mechanical properties, the flexural strength and fracture toughness of the composite reach 208.3Mpa and 128.6Mpa respectively, and the pull-out effect of the fibers is obvious in the process of tensile fracture, and the composites show ductile fracture. whereas the mechanical property decreases significantly after heating at 1200°C for100 hours due to the densification of matrix and abnormal growth of alumina grains in fibers.

Lightweight open cell aluminum foam for superior mechanical and electromagnetic interference shielding properties

In the present investigation, a simple and cost-effective method is described for preparing lightweight open cell aluminum foam by impregnating of aluminum powder into a substrate polyurethane foam template. Aluminum powder impregnated polyurethane foam was converted into open cell aluminum foam by several heat treatments inert as well reduce atmospheric pressure. The different concentrations of slurries of aluminum powder in acetone were used in combination with substrate foams to prepare open cell foams of relative density in the range of 0.08–0.22. The open cell aluminum foam prepared by this sacrificial template techniques is found to possess a compressive strength of 6.2 MPa. Electromagnetic interference shielding of aluminum foam was measured in X-band frequency region (8.2–12.4 GHz) using waveguide method. The electromagnetic interference shielding of aluminum foam with relative density of 0.22 is found −44.6 dB. This technique is fast, very economic and highly reproducible which may help the commercialization of such open cell aluminum foam for various applications.

Direct ink writing core-shell Wollastonite@Diopside scaffolds with tailorable shell micropores favorable for optimizing physicochemical and biodegradation properties

Additive manufacture has recently been proposed as a versatile process for fabricating porous bioceramic scaffolds for bone repair and tissue engineering; however, to control or tailor the biodegradation of the porous biomaterials is still a challenge. Here, the core-shell-structured biphasic bioceramic porous scaffolds with tailorable ion release and biodegradation were prepared by direct ink writing technique with coaxially aligned bi-nozzle system. Our method employed rapidly gelling filaments of wollastonite (CSi) and diopside without and with Zn or Sr doping (Dio, ZnDio, SrDio) derived from bi-flow of sodium alginate-loaded bioceramic slurries, and varying the powder slurry design made it easy to create core-shell struts (e.g. CSi@Dio, CSi@ZnDio, CSi@SrDio) with adjustable bioceramic-phase distribution. It was found that the Zn- or Sr-doping could readily adjust the mechanical strength and biodegradation rate in the early stage. Furthermore, when 30% organic microspheres were pre-mixed into the powder slurry, the controllable high-density micropores could be introduced into the shell layer after sintering (e.g. CSi@Dio-p, CSi@ZnDio-p, CSi@SrDio-p), and thus permeability is maximally tuned and favorable for ion release through the porous shell layer. This new core-shell direct ink writing strategy can be used to fabricate a variety of biphasic bioceramic scaffolds with adjustable physicochemical properties which could be potentially beneficial for improving biological performance and bone repair in situ.

Remineralization Potential of Chicken Eggshell Powder in The Treatment of Artificially Induced Enamel Carious lesion in Permanent Teeth

Objectives: This study aimed to assess and compare the enamel remineralization potential of chicken eggshell powder (CESP) solution or slurry on initial enamel caries in permanent teeth. Materials and methods: 20 caries-free human premolars were used in this study. The mineral content and surface microhardness of all specimens were initially assessed using EDX and Vickers microhardness tester respectively (positive control group). The specimens were artificially demineralized for 96 hours and then reassessed directly after demineralization (negative control group). All demineralized specimens were randomly divided into two equal groups according to the remineralization regimen used : group(I) 10 specimens were immersed in CESP solution for 12 mins, while group (II) : 10 specimens were finger rubbed with CESP slurry for 2 mins. The remineralizing agent was applied twice daily for 7 successive days. After that, the specimens were reassessed for mineral content (Ca and PO4 weight %) and surface microhardness. Finally, the pH-cycling models were used for each group followed by reassessment. The data was statistically analyzed using repeated measures analysis of variance (ANOVA). All analysis was performed with a significance level set at 5% (P≤ 0.05)..Results: There was significant decrease in both Ca and PO4 weight % after demineralization in all specimens and then it was significantly increased after treatment with remineralizing agents as detected by EDX (p <0.001). Vickers microhardness results confirmed elemental analysis results. However, there was no statistical significant difference between the two remineralized groups. In addition, there was no statistically significantly difference in the mean Ca/P wt% between (after pH cycling models ) and that of sound enamel in both groups. Also, there was no statistically significant difference in the mean Ca/P wt% between the two remineralization regimen (Gp I and Gp II) when comparing each step separately. Comparing the microhardness of enamel specimens between the four steps of the study (Sound enamel, demineralized enamel, treatment with CESP and pH cycling after treatment) revealing a statistically significant difference between 4 steps in both group I& II except for the comparison between treatment with CESP and pH cycling after treatment Conclusions: CESP has a promising future in treating initial enamel surfaces lesion due to its natural source and easy bioavailability. Remineralization using CESP solution has a similar efficacy to that of topical application of CESP slurry using finger rubbing.

Computational fluid dynamics simulation and experimental analysis of ultrafine powder suspension

The suspension characteristics of ultrafine powder slurry in the stirred vessel were simulated by using computational fluid dynamics. The results show that the Rushton disk turbine impeller is more conducive to maintaining suspended homogeneity and circulation of slurry compared with the pitch blade turbine pumping up impeller and the pitch blade turbine pumping down impeller. And the increase in stirring speed enhances turbulent fluctuation and anisotropic velocity of the fluid at the cost of more power consumption, which improves dispersibility and suspensibility of the particles. Meanwhile, the change of impeller clearance has a weak influence on the flow pattern, and the impeller clearance of 0.32T (T is the diameter of the bottom of the reactor) can achieve better dispersivity and suspensibility of the particles with lower power consumption and larger axial velocity. The experiments of surface coating modification of ultrafine titanium dioxide (TiO2) were carried out under the same conditions for those of the simulation system. The surface film morphology and photocatalytic properties of the modified TiO2 were analyzed, and the obtained data are well consistent with the simulation results.

Coating Y2O3 nano-particles with ZrO2-additive via precipitation method for colloidal processing of highly transparent Y2O3 ceramics

In the present work, transparent Y2O3 ceramics were prepared via colloidal processing method using ZrO2-coated nano-sized Y2O3 powders. The chemical precipitation method was adopted for the coating of Y2O3 raw powder. The evolution of the coated-ZrO2 layer upon calcination was studied. The rheological behaviors of the slurries of Y2O3 powders coated with different content of ZrO2-additive were investigated. The pHIEP of ZrO2-coated Y2O3 powders shows intermediate values between that of raw Y2O3 and ZrO2 powders. As the ZrO2-coating concentration increased from 0 to 5.0 at%, the magnitude of the negative zeta potential at pH > pHIEP shows a general trend of increment, whereas it decreased at pH < pHIEP. The viscosity decreases pronouncedly with the increase of ZrO2 content from 0.5 at% to 3.0 at%. The suspensions with low viscosity and high stability was achieved for a solid loading of 35.0 vol% using Y2O3 powders coated with 5.0 at% ZrO2. The dispersed suspensions were consolidated by centrifugal casting method and the green bodies shown improved homogeneity. Transparent Y2O3 ceramics were fabricated by vacuum sintering at 1800 ℃ for 5 h. Transmittance at wavelength 800 nm (1.0 mm thick) reached 80.8%, close to the theoretical value of Y2O3.

Production of calcium hexaluminate porous planar membranes with high morphological stability and low thermal conductivity

High-quality Al2O3 porous ceramic planar membranes suffer from severe deformation and cracking, which occur during sintering process. This study reports on solving this problem, by introducing calcium hydroxide powder in the alumina slurry. Phase-inversion tape-casting technology, applied during molding, and sintering at 1550 °C, favored an in-situ expansion reaction, which effectively suppressed deformation, and well-formed and crack-free calcium hexaluminate porous planar membranes were obtained. The produced membranes had a low thermal conductivity (0.69 W·m−1 K−1 at 85 °C), ascribed to the in-situ formed plate-like structure of calcium hexaluminate (CA6) and to the high porosity. After hydrophobic modification, the membranes were applied in membrane distillation processing. High rejection rate (>99.9%) and water flux (19.8 L·m-2 h−1) were achieved at 85 °C, using a 4 wt% NaCl solution as a feed solution.

Fabrication of a Porous Ni-Based Metal with a Multi-pore Structure by a Screen Printing Process

Porous metals are commonly considered as having relatively excellent characteristics, such as a large surface area, light, lower heat capacity levels, high toughness, and good permeability. Ni alloys have high corrosion resistance, good heat resistance and chemical stability for high-temperature applications. In this study, porous Ni-based metals for hydrogen reformer catalyst support are developed with Ni alloys, in this case Ni–Cr powder (28 μm), NiO powder (2 μm), and a fine Ni powder (< 1 μm). Ni–Cr powders are spread onto Al2O3 substrate by a printing process. Ni-based foam is then placed on the printed powder and a loading plate. These are sintered at 1200 °C under a high vacuum condition. The NiO powder and the fine Ni powder slurry are then screen-printed sequentially on the double structure (NiCr-coated Ni foam). In this study, the fine Ni powder is printed one, three, and five passes. The porous Ni alloys, which have double-pore structure, triple-pore structure and quadruple-pore structure, are fabricated by screen printing processes. With increased stacking of the pore structure, the porosity decreased from 86 to 82%, and the pore sizes decreased from 6.25 to 0.3 μm. The porosity and pore size of the multi-pore structure can be controlled by the size of powder and screen printing process.

Silica-Based Infiltrations for Enhanced Zirconia-Resin Interface Toughness

Novel silica-based infiltrations on the surface of zirconia have the potential to improve their bondability, allowing for the etching/silane adhesive bonding technique. Nonetheless, adhesively bonded joints are subject to mixed tensile and shear stresses when the restoration is in occlusal service. Thus, we aimed to investigate the effect of 2 novel silica-based infiltrations on the interfacial toughness of adhesively bonded zirconia using the Brazil nut method, which allows for controlled types of stresses to be applied at the interfaces. In total, 150 3Y-TZP (In-Ceram YZ; Vita) Brazil nuts were machined and randomly assigned to 3 groups: C, control (air abraded); SG, sol-gel silica infiltration; and GI, glass infiltration. SG specimens were immersed twice in silicic acid for 20 min and dried (100°C, 1 h). GI specimens were presintered (1,400°C, 1 h) before a glass powder slurry was applied to the intaglio surface. All specimens were then sintered (1,530°C, 2 h). Following adhesive bonding (Panavia F 2.0, Kuraray) and water storage (37°C) for 10 d, the Brazil nuts were subdivided into groups baseline and aged (40,000 thermal cycles between 5°C and 55°C, with a dwell time of 30 s). The Brazil nuts were subjected to axial-loading tests using various inclinations (precrack angle with load direction): Θ = 0°, 5°, 10°, 15°, or 25°, which define the stress type at the interface, from pure tension (0°) to increasing levels of shear. Under pure tension (0°), GI yielded superior interfacial fracture energy, SG and C were similar, and aging had no effect. Under predominantly shear stresses (25°), aging significantly decreased interfacial fracture energy of C and SG, while GI remained stable and was superior. The glass infiltration of the zirconia intaglio surface increases its adhesive bonding interfacial toughness. The sol-gel silica infiltration method requires improvement to obtain a homogeneous surface infiltration and an enhanced bond strength.

Long term strength and durability parameters of hardened concrete on partially replacing cement by dried waste marble powder slurry

Present study assesses and evaluates the long-term strength and durability performance of concrete on partially replacing cement by weight by dried waste marble powder slurry. Four different replacement percentages (0, 10, 15, and 20 and 25%) and three water-binder ratios (0.35, 0.40 and 0.45) have been tested in the paper. The main reason for the study is to check whether use of dried marble slurry affects the properties of concrete in long term as the amount of binder is reduced, when cement is partially replaced. Long-term impact is analyzed by testing the concrete samples for 28, 56, 90, 180 and 360 days after curing the specimens in water for 28 days and exposing the samples to adverse environmental conditions in the state of Rajasthan, India where the temperature ranges from 0 °C in winters to as high as 47 °C in summers. The concrete mixes were tested for strength parameters mainly compressive, tensile and flexural strength, also durability parameters water permeability, abrasion resistance and water sorptivity. Surface mesh for variation in all the properties with different replacement levels, curing conditions and water binder ratios are plotted in the paper. Based on the analysis of concrete with various replacement levels of marble slurry, it can be concluded that for up to 15% replacement, an enhanced physical strength and durability of concrete blocks was observed across testing periods of 28 days to 360 days. It was observed that marble dust generated an effective dense mix for higher replacement ratios, thus improving the properties in long-term duration. Finally, relationship between strength and durability properties with compressive strength are derived for marble slurry incorporated concrete.

Development and characterization of microwave processed cast iron joint

The feasibility of joining cast iron through novel microwave heating using susceptor (i.e. microwave hybrid heating), is carried out in present work. The joints were developed in domestic microwave applicator at 2.45 GHz frequency and 900 W. Nickel based powder slurry was placed between the faying surfaces for obtaining the joint. The detailed mechanism of joining through microwaves has been explained by using suitable illustrations. The microwave processed joint was characterized by using scanning electron microscopy, energy dispersive X-ray spectroscopy and X-ray diffraction for microstructure analysis and study of developed inter-metallic phases. Results revealed that uniform and dense joint of 0.5 mm thickness were obtained. Obtained joints revealed metallurgical bonding of nickel powder with faying surfaces of base metal. This metallurgical bonding resulted into wavy interface and this was due to dilution of the base metal along the joint region. The EDS analysis confirms the uniform distribution of elements in the joint region and SEM results revealed that some porosity (in the range of 1.5–1.88%) was observed in the joint region. Tensile strength of microwave joined cast iron was ∼90% of the base metal strength. This was due to the development of high strength intermetallics and presence of nickel metal in the joint region. Microhardness at joint region was 201.7 ± 18 HV and 315 ± 10 HV along HAZ, whereas microhardness of bulk cast iron was 184 ± 4 HV. Microwave processed samples fractured along the HAZ region.

Photoperiodic diapause in a subtropical population of Aedes albopictus in Guangzhou, China: optimized field-laboratory-based study and statistical models for comprehensive characterization

BackgroundAedes albopictus is among the 100 most invasive species worldwide and poses a major risk to public health. Photoperiodic diapause provides a crucial ecological basis for the adaptation of this species to adverse environments. Ae. albopictus is the vital vector transmitting dengue virus in Guangzhou, but its diapause activities herein remain obscure.MethodsIn the laboratory, yeast powder and food slurry were compared for a proper diapause determination method, and the critical photoperiod (CPP) was tested at illumination times of 11, 11.5, 12, 12.5, 13, and 13.5 h. A 4-parameter logistic (4PL) regression model was selected to estimate the CPP. In the field, the seasonal dynamics of the Ae. albopictus population, egg diapause, and hatching of overwintering eggs were investigated monthly, weekly, and daily, respectively. A distributed lag non-linear model (DLNM) was used to assess the associations of diapause with meteorological factors.ResultsIn the laboratory, both the wild population and the Foshan strain of Ae. albopictus were induced to diapause at an incidence greater than 80%, and no significant difference (P > 0.1) was observed between the two methods for identifying diapause. The CPP of this population was estimated to be 12.312 h of light. In the field, all of the indexes of the wild population were at the lowest levels from December to February, and the Route Index was the first to increase in March. Diapause incidence displayed pronounced seasonal dynamics. It was estimated that the day lengths of 12.111 h at week2016, 43 and 12.373 h at week2017, 41 contributed to diapause in 50% of the eggs. Day length was estimated to be the main meteorological factor related to diapause.ConclusionsPhotoperiodic diapause of Ae. albopictus in Guangzhou of China was confirmed and comprehensively elucidated in both the laboratory and the field. Diapause eggs are the main form for overwintering and begin to hatch in large quantities in March in Guangzhou. Furthermore, this study also established an optimized investigation system and statistical models for the study of Ae. albopictus diapause. These findings will contribute to the prevention and control of Ae. albopictus and mosquito-borne diseases.

Способ определения степени дисперсности нанопорошка

Relying upon Stokes Law there was offered a way for the definition of nano-powder dispersion on measuring a speed of its sedimentation from powder slurry in water. Way is to construct differential nanopowder’s particles distribution curve of by fractions to determine their main size.

Optimization of Sintering Time and Holding Time for 3D Printing of Fe-Based Metallic Glasses

Fe-based metallic glasses are amorphous alloys with high strength, high hardness, and excellent corrosion resistance; however, the immaturity of processing methods has prevented their wide application in industrial production. Fe-based metallic glass parts were manufactured employing pneumatic injection additive manufacturing in this study. An evenly dispersed and stable Fe-based metallic glass powder slurry with a solids content of 50% was prepared firstly. Then the Fe-based metallic glass parts were printed. The printed parts were dried, debinded, and sintered for strengthening. The deformations of the printed parts and sintered parts relative to the original model were then analyzed by a 3D scanning reconstruction method. The slightly average bulging and sunken deformation of the printed parts and sintered parts confirmed the good printing accuracy of the pneumatic injection manufacture system. The effects of the sintering temperature and holding time on the properties of the sintered parts were studied. For a sintering temperature of 580 °C and holding time of 1 h, the surface quality of the sintered parts was better. The sintering of 3D-printed Fe-based metallic glass parts was preliminarily realized in this study, and the feasibility of preparing Fe-based metallic glass using pneumatic injection additive manufacture was verified.

Porous glass-ceramics from alkali activation and sinter-crystallization of mixtures of waste glass and residues from plasma processing of municipal solid waste

Abstract Alkali-activated aqueous slurries of fine glass powders, mostly deriving from the plasma processing of municipal solid waste (‘Plasmastone’), were found to undergo progressive hardening at low temperature (75 °C) owing to the formation of C S H (calcium silicate hydrate) gels. Before complete setting, slurries could be easily foamed by vigorous mechanical stirring, with the help of a surfactant; finally, the resulting open-celled structure could be ‘frozen’ by a subsequent sintering treatment, with crystallization of Ca Fe silicates. The densification of the struts upon firing was enhanced by mixing Plasmastone with up to 30 wt% recycled glasses and increasing the firing temperature from 800 to 1000 °C. A total porosity exceeding 75 vol%, comprising both well-interconnected macro- and micro-sized pores on cell walls, was accompanied by good compressive strength, well above 1 MPa. The stabilization of pollutants generally increased with increasing firing temperature and glass content, with some exceptions; no practical leaching was observed from samples deriving from Plasmastone combined with 30 wt% boro-alumino-silicate glass from the recycling of pharmaceutical vials.

Study of printing parameters of pneumatic-injection 3D printing of Fe-based metallic glass

A helpful method to process Fe-based metallic glass called pneumatic-injection 3D printing is proposed. Considering the characteristics of Fe-based metallic glass particles, such as large particle size, high density, and complex surface ions, their wettability and suspension stability were investigated using experiments based on the Washburn equation. The effect of pH value, powder's morphology and granularity on wettability was qualitatively analyzed. Multiple dispersants for the slurries of Fe-based metallic glass powder were tested. The experimental results revealed the wettability of the spherical powder with a size range of 45–200 μm was relatively high. An alkaline environment was not conducive to the wetting and stable dispersion. Ammonium polyacrylate was found to be the best dispersing agent for the Fe-based metallic glass powder. A uniform, stable Fe-based metallic glass slurry with a solid content of 50% was prepared. The width of the printed line increased with the pressure and decreased with increasing nozzle speed. The study of printing parameters provides guidance to improve the quality and accuracy of pneumatic-injection 3D printing of metallic glass.

3D-printed conductive static mixers enable all-vanadium redox flow battery using slurry electrodes

State-of-the-art all-vanadium redox flow batteries employ porous carbonaceous materials as electrodes. The battery cells possess non-scalable fixed electrodes inserted into a cell stack. In contrast, a conductive particle network dispersed in the electrolyte, known as slurry electrode, may be beneficial for a scalable redox flow battery. In this work, slurry electrodes are successfully introduced to an all-vanadium redox flow battery. Activated carbon and graphite powder particles are dispersed up to 20 wt% in the vanadium electrolyte and charge-discharge behavior is inspected via polarization studies. Graphite powder slurry is superior over activated carbon with a polarization behavior closer to the standard graphite felt electrodes. 3D-printed conductive static mixers introduced to the slurry channel improve the charge transfer via intensified slurry mixing and increased surface area. Consequently, a significant increase in the coulombic efficiency up to 95% and energy efficiency up to 65% is obtained. Our results show that slurry electrodes supported by conductive static mixers can be competitive to state-of-the-art electrodes yielding an additional degree of freedom in battery design. Research into carbon properties (particle size, internal surface area, pore size distribution) tailored to the electrolyte system and optimization of the mixer geometry may yield even better battery properties.

Degradation of organic compounds during the corrosion of ZVI by hydrogen peroxide at neutral pH: Kinetics, mechanisms and effect of corrosion promoting and inhibiting ions

The corrosion of zero valent iron (ZVI) by hydrogen peroxide (H2O2) generates hydroxyl (⋅OH) and other radical oxygen species (ROS) that degrade organic materials. To better understand the factors that govern the ROS formation during the H2O2-induced corrosion, we investigated the degradation of an organic probe compound (acesulfame (ACE)) in slurries of ZVI powder in unbuffered laboratory water at pH 6.5 ± 0.5. Chloride ions accelerated the corrosion of ZVI by H2O2 and the formation ROS and, therefore, the degradation of organic materials. Conversely, slowing corrosion by phosphate buffer inhibited ROS formation and the degradation of organic compounds. The rate of H2O2 decomposition was correlated with the liberation of Fe2+(aq) and the ACE degradation rate. The kinetics of H2O2 decomposition was pseudo-first-order and zero-order at low (<0.04 mM/mg) and high [H2O2]/[ZVI] initial ratios, respectively, and was consistent with Langmuir kinetics. The H2O2 decomposition rate was proportional to the ZVI reactive surface area (SA) and nearly independent of the extent of ZVI oxidation, the presence of a Fe2+(aq) chelating agent, and ⋅OH quenchers (methanol and tert-butanol). Kinetic data suggest a mechanism involving rapid cathodic reduction of H2O2 at the metallic ZVI surface which causes the liberation of Fe2+(aq) that generate ⋅OH via the homogeneous Fenton reaction. The stoichiometric efficiency (SE) of organics degradation ranged from 0.0008% to 0.014% and increased with decreasing H2O2 decomposition rate.