Biochar is often promoted as a promising tool for climate-smart agriculture, thanks to its ability to store carbon in soils and, in many cases, reduce emissions of nitrous oxide, a powerful greenhouse gas. But a study published in Biochar shows that the climate benefit of biochar is not guaranteed. The way biochar is produced, and the chemical groups present on its surface, can determine whether it helps reduce nitrous oxide or unexpectedly increases it.

In recent years, the explosive growth of electronic devices and wireless communication technologies has intensified electromagnetic pollution, creating an urgent demand for high-performance electromagnetic wave absorption (EMA) materials. Such materials must simultaneously achieve lightweight design, broad bandwidth, and strong attenuation capability. While low-dimensional nanomaterials like MXene and graphene are widely employed due to their exceptional dielectric loss properties, limitations at the microscopic scale hinder the formation of effective conductive networks, restricting electromagnetic energy conversion efficiency.

Hierarchical conductive network structures—such as fibrous felts—offer a breakthrough solution by significantly enhancing absorption performance through interfacial coupling, eddy current loss, and optimized porous architectures. However, the high intrinsic conductivity of MXene necessitates low filling contents to achieve impedance matching, paradoxically constraining conductive network development. Thus, the core challenge lies in designing tunable impedance structures while optimizing MXene distribution to overcome current technological bottlenecks.

The study unveiled a novel regulation strategy that exhibits exceptional performance in gas sensing applications. This advanced material demonstrates outstanding selectivity, rapid response, and ultrahigh sensitivity, particularly in detecting ammonia (NH₃) molecules. The research, led by a team from East China University of Science and Technology, provides new insights into the gas sensing mechanisms of MXenes and introduces a synergistic strategy to optimize their performance.

The inherent structural instability and insufficient catalytic efficiency of enzymes may affect the reliability and sensitivity of enzyme-based immunosensors, especially in ultra-trace analysis. While covalent organic frameworks (COFs) offer excellent immobilization support due to their structural tunability and stability, conventional physical adsorption risks enzyme leakage, and their dense shells hinder mass transfer. Recent advances in defect engineering allow precise modulation of COF-enzyme interactions, enabling optimized enzyme conformation and activity, providing a promising platform for high-performance biosensors.

Modern technologies face overlapping challenges from electromagnetic interference, fire risk, heat buildup, and noise. Researchers developed a lightweight, bio-based aerogel to address these issues simultaneously. Using cellulose combined with metal–organic frameworks (MOFs) and controlled carbonization, they created a porous material that absorbs microwaves, reduces flammability, insulates heat, and dampens sound. The multifunctional performance is achieved with low filler content, demonstrating a sustainable strategy for advanced protective materials across multiple demanding applications.

A global analysis suggests that biochar, a charcoal-like material made from biomass, could play a larger role in climate-smart agriculture when it is applied according to local soil and climate conditions. The study, published in Biochar, combines global meta-analysis, machine learning, and density functional theory calculations to identify how different biochar types and application rates can help reduce greenhouse gas emissions from croplands while improving crop yields.

As the world searches for practical ways to reduce carbon dioxide emissions, scientists are developing catalysts that can transform CO2 from a climate concern into a useful industrial resource. A study published in Biochar reports a coconut shell-derived biochar catalyst that efficiently converts CO2 into carbon monoxide, an important building block for producing fuels, chemicals, methanol, olefins, and polymers.

Researchers have developed a light-driven catalyst made from two common waste materials, discarded PET plastic bottles and orange peels, that can efficiently break down acetaminophen in water. The study, published in Biochar, presents a sustainable strategy that links plastic upcycling with advanced water treatment.

A new series of metal-organic frameworks (MOFs), donated as USC-CP-5-R, have been constructed using 14-connected metal-organic polyhedra as super-molecular building blocks (SBBs), exhibiting ultrahigh water stability. Functionalized with variable hydrophilic groups enables systematic tuning of the water adsorption performances, including uptake capacity and inflection point (a). These frameworks can efficiently capture atmospheric moisture, even in arid environments and can release collected water using low-grade solar thermal energy, highlighting their potential as a sustainable solution for freshwater production in water-scarce regions.