Highly selective nitrate reduction to N by Cu-nZVI/LDH bimetallic composite: Mechanism, reaction pathway and strategy for enhanced N formation.

Due to the highly reductive capacity of nano zero-valent iron (nZVI), the reduction of nitrate (NO-N) is prone to produce ammonia (NH-N) as a by-product and has low selectivity for nitrogen gas (N). Selective conversion of NO-N to harmless N by regulating reaction pathway is the key to improve the reduction and nitrogen removal performance of nZVI-based materials. In this study, metal copper (Cu) was added to nZVI to prepare Cu-nZVI/LDH bimetallic composites.

A critical review of nitrate reduction by nano zero-valent iron-based composites for enhancing N selectivity.

Due to the highly reductive capacity of nano zero-valent iron (nZVI) nanoparticles, the reduction of nitrate (NO-N) is prone to produce ammonia nitrogen (NH-N) as a by-product and has low selectivity for nitrogen gas (N). Water and dissolved oxygen (DO) in the solution consume electrons from nZVI, decreasing the efficiency of NO-N reduction. In order to overcome the drawbacks of plain nZVI being used to remove NO-N pollution, nZVI-based multifunctional materials have been constructed to realize the selective conversion of NO-N to N as well as the efficient removal of NO-N.

Anthropogenic warming is a key climate indicator of rising urban fire activity in China.

China, one of the most populous countries in the world, has suffered the highest number of natural disaster-related deaths from fire. On local scales, the main causes of urban fires are anthropogenic in nature. Yet, on regional to national scales, little is known about the indicators of large-scale co-varying urban fire activity in China.

Mass Spectrometry-Imaging Analysis of Active Ingredients in the Leaves of .

Background: is an endangered evergreen conifer mainly found in Northeast Asia. In addition to the well-known taxanes, several active ingredients were detected in the leaves of . However, the precise spatial distribution of active ingredients in the leaves of is largely unknown.

Synergistic effect and mechanism of nZVI/LDH composites adsorption coupled reduction of nitrate in micro-polluted water.

In this study, nZVI/LDH composites were prepared by loading nano zero-valent iron (nZVI) on layered double hydroxide (LDH) surface for adsorption coupled reduction of nitrate (NO-N). The results showed that the removal of NO-N and total nitrogen (TN) by the nZVI/LDH composites was 88.64% and 77.

Effects of high air temperature, drought, and both combinations on maize: A case study.

High air temperature (HAT) and natural soil drought (NSD) have seriously affected crop yield and frequently take place in a HAT-NSD combination. Maize (Zea mays) is an important crop, thermophilic but not heat tolerant. In this study, HAT, NSD, and HAT-NSD effects on maize inbred line Huangzao4 -were characterized.

Synergistic effect of a triethanolamine-modified carbon-based layered double hydroxide for efficient removal of nitrate from micro-polluted water.

Owing to the ubiquitous existence and low concentrations of detrimental nitrogen pollutants in micro-polluted water, simple adsorption-oriented approaches are becoming increasingly appealing for the effective removal of NO from wastewater. Triethanolamine (TDA) modified carbon-based layered double hydroxide (LDH) composites (TDA@LDH/CS) were synthesized by a supersaturated co-precipitation method for efficient NO adsorption. The characterization results showed that TDA@LDH/CS, formed by the stacking of irregular nanosheets and lamellar aggregates, has a mesoporous structure and a specific surface area of 67.

MnO Nanoparticles Supported by Carbonized Cotton Fiber Foil as a Free-Standing Anode for High-Performance Lithium Ion Batteries.

A three-dimensional (3D) network structure composite of MnO nanoparticles (NPs) and carbonized cotton fiber foil (CCFF) is introduced as an anode material free of binders and conductive additives for Li-ion batteries (LIBs). CCFF with its closely linked networks provides a stable framework for metal oxides and improves the electrical conductivity of the composite. MnO NPs are evenly distributed on the surface of CCFF and concurrently embedded in the carbon matrix through simply annealing the MnO precursor (MnO-P)/cotton fiber foil (CFF) composite.

Template-free synthesis of nanoparticle-built MgO and Zn-doped MgO hollow microspheres with superior performance for Congo red adsorption from water.

Nanoparticle-built MgO hollow microspheres were synthesized through a template-free hydrothermal route using citrate as a structural director. Zn was introduced into MgO to improve the surface charge. Pure MgO and Zn-doped MgO samples were characterized by X-ray diffraction (XRD), energy-dispersive X-ray spectrometry (EDX), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and a zeta-potential analyzer.

Synthesis of core-shell SiO₂@MgO with flower like morphology for removal of crystal violet in water.

In this study, we report a facile and effective route to synthesize core-shell SiO2@MgO with flower like morphology, which the shell is assembled by magnesium oxide nanosheets. The SiO2@MgO composite (SMC) was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), energy-dispersive X-ray spectrometry (EDX), X-ray fluorescence (XRF) and N2 adsorption-desorption techniques. The sample showed excellent performance for the removal of crystal violet due to its high specific surface area and porous structures.