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environmental engineering --- waste treatment --- environmental remediation --- disaster mitigation

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The 2017 International Conference on Micro/Nanomachines (http://www.icmnm.org/) was held in Wuhan, China, 25–28 August, 2017. Micro/nanomotors (MNMs), which are defined as micro/nanodevices capable of converting energy into autonomous motion, can be used to pick up, transport, and release various cargoes within a liquid medium. They have important potential applications, for example, in drug delivery, biosensors, protein and cell separation, microsurgeries, and environment remediation. MNMs can be classified into two categories, according to their propulsion mechanism. In this respect, self-propelled MNMs are capable of moving autonomously without external intervention, but they either require toxic fuel or have a short lifespan. MNMs actuated by external fields, such as light, magnetic field, and acoustic waves, are not subject to these problems, do not require toxic fuels, nor give rise to by-products during the motion process. For both self-propelled and field-actuated MNMs, there is still a long way to go before we reach practical applications. The future development of MNMs should be focused on improving the energy conversion efficiency through structure optimization, exploring new propulsion mechanisms and endowing MNMs with environmental responses for self-navigation, detection, and specific operations. In this way, MNMs will approach their practical application in biomedicine, environment treatment, microengineering, etc.

Autonomous motion --- Microengineering --- Micro/Nanomachines --- Environmental remediation --- Self-navigation --- Drug delivery

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This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact

photocatalysis --- Environmental Remediation --- carbon nitride --- Bi-based photocatalyst --- reaction mechanism --- Heterojunction --- Doping

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This Special Issue entitled “Environmental Restoration of Metal-Contaminated Soils” focuses on the issues linked to soils contaminated with heavy metals and metalloids, dealing with current research activities around the world at the laboratory and field scale. These activities are the pillars for the application of strategies on a real-world scale, to remediate industrial soils affected by the problem. When an industrial soil contains pollutants, the main problem is the removal of these compounds. However, other features are present, linked to the health of the population living in its proximity. This Special Issue reports experimental run findings with the aim of removing heavy metals and/or metalloids from soil, making use of challenging techniques, and also demonstrating approaches for the assessment of the risks to human health.

Research & information: general --- seedling biomass --- heavy metals --- soil amelioration --- urban gardens --- pollution --- contaminated soil --- amendment --- edible plants --- metal --- citric acid --- EDTA --- electrokinetic remediation --- bioaccessibility --- bioavailability --- metals --- contaminated sites --- risk assessment --- natural sorbents --- ameliorants --- disturbed lands --- adsorption --- recultivation --- environmental remediation --- revitalization --- renaturation --- restoration --- rehabilitation --- reclamation --- heavy metals and metalloids --- removal techniques --- hydrophobic --- copper --- microfluidics --- pH change --- remediation --- seedling biomass --- heavy metals --- soil amelioration --- urban gardens --- pollution --- contaminated soil --- amendment --- edible plants --- metal --- citric acid --- EDTA --- electrokinetic remediation --- bioaccessibility --- bioavailability --- metals --- contaminated sites --- risk assessment --- natural sorbents --- ameliorants --- disturbed lands --- adsorption --- recultivation --- environmental remediation --- revitalization --- renaturation --- restoration --- rehabilitation --- reclamation --- heavy metals and metalloids --- removal techniques --- hydrophobic --- copper --- microfluidics --- pH change --- remediation

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Photoactive nanomaterials have been receiving increasing attention due to their potential application in the light-driven degradation of water and gas-phase pollutants. However, to exploit the great potential of photoactive materials and access their properties requires fine-tuning of their size/shape-dependent chemical–physical properties, and on the ability to integrate them in photoreactors or to deposit them onto large surfaces. Therefore, the synthetic approach as well as post-synthesis manipulation could strongly affect the final photocatalytic properties of the nanomaterial. The aim of the present Special Issue is to report on the most recent progress towards the application of photoactive nanomaterials and nanomaterial-based coatings in pollutant degradation, paying particular attention to cases close to real application: scalable synthetic approaches to nanocatalysts, preparation of nanocatalyst-based coatings, degradation of real pollutants and bacterial inactivation, and application in building materials.

toxicity --- polar herbicide --- composite nanorods --- heterojunction --- degradation --- nanocomposites --- nanoparticles --- polyester --- TiO2 nanotube --- environmental remediation --- building materials --- hydroxyapatite --- VOCs --- reactive green 12 --- Pt loaded TiO2 --- nanomaterials --- expansion --- photocatalytic activity --- CuxO/TiO2 --- water remediation --- antimicrobial properties --- sputtering --- diclofenac --- mesoporous --- TiO2 --- advanced oxidation processes --- mortar --- disinfection --- HiPIMS --- microcracks --- Cu2O --- sulfate attack --- NOx --- photocatalysis --- blast furnace slag --- paraquat --- recalcitrant pollutants --- shell thickness --- water treatments --- visible light LEDs --- cement --- deterioration --- transformation products --- gas-phase pollutants --- titanium dioxide --- photoelectrocatalysis --- Z-scheme