Hydrogen Peroxide Cleaning of Asphalt from Surfaces The Accelerating Rate Calorimetry (ARC™) Study: The Effect of Silica Gel and Solution pH on Hydrogen Peroxide Decomposition
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Xiaoyan Zhang
Abstract
The pharmaceutical, fine chemical, photography, and military industries have aggressively sought means of eliminating organic solvents from their cleaning operations because many organic cleaning solvents have been characterized as hazardous or toxic wastes. As a substitute, we previously found that 3% hydrogen peroxide (H2O2) in water effectively removed tenacious residues from glass surfaces. Studies also showed that mild heating and a moderately high solution pH (8.5 to 9.5) enhanced cleaning. Possible mechanisms of such cleaning process were investigated herein by studying kinetic properties of the process via Accelerating Rate Calorimetry. The activation energy and on-set temperature of hydrogen peroxide decomposition decreased and rate constants increased as increasing solution pHs. The decomposition was first order, uncatalyzed reaction at initial pH 5.0, and a more rapid second order reaction at initial pH 8.5 in titanium bombs. The rate constant of the second order alkaline-induced decomposition was estimated as 0.019 M-1s-1 at 30 °C in titanium bombs. The lowest rate constant was observed as 1 x 10-8 s-1 at 30 °C and pH 5.0-7.0 using 3% H2O2 . The presence of chromatographic silica gel did not exhibit a catalytic effect on the decomposition of H2O2 in a manner that lowered the activation energy, although it did lower the reaction rate and increase the onset temperature to some extent. As much as 35 g/L silica gel was also found to almost completely depress the reactions. The actual asphalt cleaning process was also simulated inside the calorimeter bomb, but yielded no significant changes in kinetic properties.
© 2016 by Walter de Gruyter Berlin/Boston
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Artikel in diesem Heft
- Streamer Corona Discharge Induced by Laser Pulses During LIF Measurements in a DC Non-thermal Plasma Reactor for NO Oxidation
- Destruction of Volatile Organic Compounds in Air by a Superimposed Barrier Discharge Plasma Reactor and Activated Carbon Filter Hybrid System
- The Photodecomposition of Acetaldehyde in Gas Phase Using Immobilized TiO2 on Porous α-Al2O3 Tube
- Hydrogen Peroxide/Iron Oxide -Induced Catalytic Oxidation of Organic Compounds
- Vacuum-UV Oxidation (H2O-VUV) with a Xenon Excimer Flow-Trough Lamp at 172 nm: Use of Methanol as Actinometer for VUV Intensity Measurement and as Reference Compound for OH-Radical Competition Kinetics in Aqueous Systems
- Homogeneous Photoreactions for AOTs: Reactor Analysis and Design
- A Laboratory Reactor for Photocatalytic Studies in Slurry Operation
- Optical Characteristics of Capillary U-tube Ar-Hg High Frequency Glow Discharge Plasmas and its Application for Ammonia Compound Contaminated Water Treatments
- Gas-Phase Photocatalytic Degradation of Trichloroethylene -Relation with Photochemical Reactions
- Hydrogen Peroxide Cleaning of Asphalt from Surfaces The Accelerating Rate Calorimetry (ARC™) Study: The Effect of Silica Gel and Solution pH on Hydrogen Peroxide Decomposition
- Characteristics of Ring-to-Cylinder Type Electrode System on Pulsed Discharge in Water
- Nitrogen Oxides Removal by Using Plate Type Reactor Combined with Catalysts
- A Comparison of the Activity of Titanium Dioxide Photocatalysts for the Oxidation of Ethanol in Air
- TiO2 Photocatalytic Oxidation of Butyraldehyde, Ethylbenzene and PCE in the Air through Concentric Reactors
