There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

Recent developments of zinc oxide based photocatalyst in water treatment technology: A review

Technologies for the removal of phenol from fluid streams: a short review of recent developments.

It is well known that urbanization and industrialization have resulted in the rapidly increasing emissions of volatile organic compounds (VOCs), which are a major contributor to the formation of secondary pollutants (e.g., tropospheric ozone, PAN (peroxyacetyl nitrate), and secondary organic aerosols) and photochemical smog. The emission of these pollutants has led to a large decline in air quality in numerous regions around the world, which has ultimately led to concerns regarding their impact on human health and general well-being. Catalytic oxidation is regarded as one of the most promising strategies for VOC removal from industrial waste streams. This Review systematically documents the progresses and developments made in the understanding and design of heterogeneous catalysts for VOC oxidation over the past two decades. It addresses in detail how catalytic performance is often drastically affected by the pollutant sources and reaction conditions. It also highlights the primary routes for catalyst deactivation and discusses protocols for their subsequent reactivation. Kinetic models and proposed oxidation mechanisms for representative VOCs are also provided. Typical catalytic reactors and oxidizers for industrial VOC destruction are further discussed. We believe that this Review will provide a great foundation and reference point for future design and development in this field.

/pdf/recent-advances-in-the-catalytic-oxidation-of-volatile-zw2c35dbg7.pdf

Recent Advances in the Catalytic Oxidation of Volatile Organic Compounds: A Review Based on Pollutant Sorts and Sources.

Adsorption of VOCs onto engineered carbon materials: A review

https://ir.library.oregonstate.edu/downloads/fq977v43z

The effect of pore structure of zeolite on the adsorption of VOCs and their desorption properties by microwave heating

Adsorption–desorption characteristics of VOCs over impregnated activated carbons

High-rate synthesis of Cu–BTC metal–organic frameworks

Integration of optical fiber with sensitive thin films offers great potential for the realization of novel chemical sensing platforms. In this study, we present a simple design strategy and high performance of nanoporous metal–organic framework (MOF) based optical gas sensors, which enables detection of a wide range of concentrations of small molecules based upon extremely small differences in refractive indices as a function of analyte adsorption within the MOF framework. Thin and compact MOF films can be uniformly formed and tightly bound on the surface of etched optical fiber through a simple solution method which is critical for manufacturability of MOF-based sensor devices. The resulting sensors show high sensitivity/selectivity to CO2 gas relative to other small gases (H2, N2, O2, and CO) with rapid (<tens of seconds) response time and excellent reversibility, which can be well correlated to the physisorption of gases into a nanoporous MOF. We propose a refractive index based sensing mechanism for t...

Metal–Organic Framework Thin Film Coated Optical Fiber Sensors: A Novel Waveguide-Based Chemical Sensing Platform

Bimetallic Pt–Au catalysts supported on ZnO/Al2O3 were prepared by the impregnation (IMP) and incipient wetness impregnation (IW-IMP) methods in air or H2 and compared with a monometallic Pt/ZnO/Al2O3 catalyst. The catalysts were characterized by ultraviolet–visible spectroscopy (UV–vis), X-ray diffraction (XRD), CO chemisorption, temperature-programmed reduction (TPR), X-ray photoelectron spectroscopy (XPS) and scanning transmission electron microscopy (STEM) in conjunction with energy dispersive spectroscopy (EDS). The catalytic activity for the complete oxidation of toluene was measured using a flow reactor under atmospheric pressure. The relationship between the particle size and catalytic activity for toluene over bimetallic Pt–Au catalysts is discussed. In the results, generally, the Pt particles prepared by IW-IMP in H2 were larger than those prepared by IMP in air. On the other hand, the Au particles prepared by IW-IMP in H2 were smaller than those prepared by IMP in air, namely when using IW-IMP in H2 the Au particle size was decreased and the Pt particle size was increased. Also, the particle sizes of Pt and Au increased with increasing calcination temperature. The STEM and XRD results show that Pt and Au were simultaneously deposited as metallic particles on the ZnO/Al2O3 without forming an alloy with the Pt and Au. From the TPR results, it was found that the nanosized Au particles might promote the reduction of the surface oxygen and that the complete oxidation of toluene shows higher activity at lower temperature over the bimetallic Pt–Au catalysts as compared to the Pt/ZnO/Al2O3 catalyst. The bimetallic Pt–Au catalysts prepared by IW-IMP in H2 calcined at 400 °C showed higher activity for complete toluene oxidation.

Ki-Joong Kim

Papers

The effect of pore structure of zeolite on the adsorption of VOCs and their desorption properties by microwave heating

Adsorption–desorption characteristics of VOCs over impregnated activated carbons

High-rate synthesis of Cu–BTC metal–organic frameworks

Metal–Organic Framework Thin Film Coated Optical Fiber Sensors: A Novel Waveguide-Based Chemical Sensing Platform

Complete oxidation of toluene over bimetallic Pt–Au catalysts supported on ZnO/Al2O3