In this Review, we aim to provide an updated summary of the research related to hollow micro- and nanostructures, covering both their synthesis and their applications. After a brief introduction to the definition and classification of the hollow micro-/nanostructures, we discuss various synthetic strategies that can be grouped into three major categories, including hard templating, soft templating, and self-templating synthesis. For both hard and soft templating strategies, we focus on how different types of templates are generated and then used for creating hollow structures. At the end of each section, the structural and morphological control over the product is discussed. For the self-templating strategy, we survey a number of unconventional synthetic methods, such as surface-protected etching, Ostwald ripening, the Kirkendall effect, and galvanic replacement. We then discuss the unique properties and niche applications of the hollow structures in diverse fields, including micro-/nanocontainers and rea...

Synthesis, Properties, and Applications of Hollow Micro-/Nanostructures

https://iris.unipa.it/bitstream/10447/74239/1/Di%20Paola-J%20hzardous%20mater%202012-survey.pdf

A survey of photocatalytic materials for environmental remediation.

The problem of textile dye pollution has been addressed by various methods, mainly physical, chemical, biological, and acoustical. These methods mainly separate and/or remove the dye present in water. Recently, advanced oxidation processes (AOP) have been focused for removal of dye from waste water due to their advantages such as ecofriendly, economic and capable to degrade many dyes or organic pollutant present in water. Photocatalysis is one of the advance oxidation processes, mainly carried out under irradiation of light and suitable photocatalytic materials. The photocatalytic activity of the photocatalytic materials mainly depends on the band gap, surface area, and generation of electron–hole pair for degradation dyes present in water. It has been observed that the surface area plays a major role in photocatalytic degradation of dyes, by providing higher surface area, which leads to the higher adsorption of dye molecule on the surface of photocatalyst and enhances the photocatalytic activity. This present review discusses the synergic effect of adsorption of dyes on the photocatalytic efficiency of various nanostructured high surface area photocatalysts. In addition, it also provides the properties of the water polluting dyes, their mechanism and various photocatalytic materials; and their morphology used for the dye degradation under irradiation of light along with the future prospects of highly adsorptive photocatalytic material and their application in photocatalytic removal of dye from waste water.

Recent advances based on the synergetic effect of adsorption for removal of dyes from waste water using photocatalytic process

Peculiar porous α-Fe2O3, γ-Fe2O3 and Fe3O4 nanospheres: Facile synthesis and electromagnetic properties

A series of iron titanate catalysts, FeaTibOx, with different Fe−Ti molar ratios are synthesized via a facile coprecipitation method and tested for the selective catalytic reduction (SCR) of NOx wi...

Structure-Activity Relationship of Iron Titanate Catalysts in the Selective Catalytic Reduction of NOx with NH3 †

Hollow sea urchin-like α-Fe 2 O 3 nanostructures were successfully synthesized by a hydrothermal approach using FeCl 3 and Na 2 SO 4 as raw materials, and subsequent annealing in air at 600 °C for 2 h. The hollow sea urchin-like α-Fe 2 O 3 nanostructures with the diameters of 2–4.5 μm consist of well-aligned α-Fe 2 O 3 nanorods with an average length of about 1 μm growing radially from the centers of the nanostructures, have a hollow interior with a diameter of about 2 μm. α-Fe 2 O 3 nanocubes with a diameter of 700–900 nm were directly obtained by a hydrothermal reaction of FeCl 3 at 140 °C for 12 h. The response S r ( S r  =  R a / R g ) of the hollow sea urchin-like α-Fe 2 O 3 nanostructures reached 2.4, 7.5, 5.9, 14.0 and 7.5 to 56 ppm ammonia, 32 ppm formaldehyde, 18 ppm triethylamine, 34 ppm acetone, and 42 ppm ethanol, respectively, which was excess twice that of the α-Fe 2 O 3 nanocubes and the nanoparticle aggregations. Our results demonstrated that the hollow sea urchin-like α-Fe 2 O 3 nanostructures were very promising for gas sensors for the detection of flammable and/or toxic gases with good-sensing characteristics.

Controlled synthesis and gas-sensing properties of hollow sea urchin-like α-Fe2O3 nanostructures and α-Fe2O3 nanocubes

Microspheres constructed from ZnSe nanoparticles with a cubic structure and spherical flowerlike nanoarchitectures assembled from ZnSe(en)0.5 nanoflakes were synthesized via a solvothermal reaction...

Fenghua Zhang

Papers

Controlled synthesis and gas-sensing properties of hollow sea urchin-like α-Fe2O3 nanostructures and α-Fe2O3 nanocubes

Controlled Synthesis and Photocatalytic Activity of ZnSe Nanostructured Assemblies with Different Morphologies and Crystalline Phases

Preparation and photocatalytic activity of hollow ZnSe microspheres via Ostwald ripening

Synthesis of hollow microspheres constructed with α-Fe2O3 nanorods and their photocatalytic and magnetic properties

Synthesis and size-dependent magnetic properties of single-crystalline hematite nanodiscs