Structure and crystallization behavior of aqueous KCl-MgCl solutions.

Potassium resources are abundant in the brine of chloride-type salt lakes. The main challenge in the efficient separation and extraction of potassium from salt lakes lies in the insufficient understanding of the structure and crystallization behavior of brine solutions and their correlation. In the present work, X-ray scattering (XRS) and computational simulation methods were used to study the microstructure of KCl and MgCl mixed solutions, including the hydration and association structures of ions in the solutions.

Deciphering pollution sources and mechanisms controlling groundwater chemistry in a typical dense agricultural plain on Yungui Plateau.

Groundwater is a critical resource for economic growth and livelihoods in the dense agricultural plains of plateaus. However, contaminations from various sources pose significant threats to groundwater quality. Understanding the sources of groundwater contamination and the mechanisms of hydrochemical control is essential for the sustainable development of agriculturally intensive plains.

Sensorable zwitterionic antibacterial hydrogel for wound electrostimulation therapy.

Wound healing process has always been a focal point of concern, with a plethora of hydrogel dressings available; however, their therapeutic efficacy remains a hindrance to wound closure. This article reports on a dual-network conductive system, PEDOT:PSS-co-PSBMA/XLG (PPSX) hydrogel dressing, Constructed using poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) (PEDOT: PSS) in combination with zwitterionic N, N-dimethyl-N-(2-methacryloyloxyethyl)-N- (3-sulfopropyl) ammonium betaine (SBMA) and nanoclay-synthesized lithium magnesium silicate (XLG). The hydrogel powder produced from it can absorb interfacial water within 30 s via physical interactions to spontaneously form hydrogels of arbitrary shapes.

Co-exposure of microplastics with heavy metals increases environmental pressure in the endangered and rare wildlife reserve: A case study of the zhalong wetland red-crowned crane nature reserve, northeast China.

Microplastics (MPs) exposure to remote areas, including endangered and rare wildlife reserves, has attracted increasing concern. Compared with previous research mostly draws attention to the single exposure of MPs to the environment, greater emphasis should be placed on understanding the complex environmental behaviors of MPs. Therefore, the potential risks of MPs to ecosystems need to be explored in combination with their coexistence with other contaminants, but this is not well-understood.

2D Membranes Interlayered with Bimetallic Metal-Organic Frameworks for Lithium Separation from Brines.

Efficient lithium extraction from salt lakes is essential for a sustainable resource supply. This study tackles the challenge of separating Li from Mg in complex brines by innovatively integrating two-dimensional (2D) graphene oxide (GO) with bimetallic metal-organic frameworks (MOFs). Zn and Co ions are confined within GO interlayers through an in situ synthesis, forming a 2D Zn-Co MOFs/GO membrane (Zn-Co-GOM).

B-Li differential enrichment of geothermal systems in the Da Qaidam and Gonghe-Guide Basin, northeastern Tibetan Plateau: Evidence from water chemistry and H-O-B-Li isotopes.

Typical geothermal systems in the Da Qaidam (DQ) and Gonghe-Guide Basin (GGB) on the northeastern Tibetan Plateau (NETP) discharged different BLi contents. A widely accepted metallogenic model is that the salt-lake type BLi deposits in the TP are recharged by geothermal fluids with B-Li-rich, carried by rivers and enriched in the terminal salt lakes. The B-Li-rich geothermal water is the key source of mineralization in salt lakes, however, enrichment mechanism governing differential BLi contents in DQ and GGB geothermal systems remains ambiguous.

CuO-SnO-PDA heterozygous nanozyme doped hydrogel mediated conglutinant microenvironment regulation for wound healing therapy.

Bacterial infection significantly hinders the wound healing process. Overuse of antibiotics has led to the rise of drug resistance in bacteria, making the development of smart medical dressings that promote wound healing without antibiotics, a critical need. In this study, Cu₂O-SnO₂-PDA (PCS) nanoenzymes with Fenton-like activity and high photothermal conversion efficiency were developed.

Chitosan-Based Composite Aerogel with a Rapid Tissue Hydration Layer-Triggered Response to Promote Hemostasis.

Aerogels exhibit poor adhesion to wet tissue surfaces, which is a significant factor that limits their hemostatic properties. In this work, we propose a new method for investigating aerogel hemostatic materials by introducing the concept of the 'rapid tissue hydration layer-triggered property' into the hemostatic material. A chitosan derivative () with a "swollen property" was prepared via an amide reaction, followed by the incorporation of the extracted bletilla striata complex () into the chitosan derivative to fabricate the hemostatic material.

Enhancing Cr(vi) removal performance of TiCT through structural modification by using a spray freezing method.

Structural modification is expected to be a facile way to enhance the adsorption performance of MXene. In this work, the structural modification of TiCT was carried out by a spray freezing method, and two kinds of nano-structure (spherical and flaky) of TiCT were prepared by adjusting the solution concentration of TiCT . Then the Cr(vi) adsorption capacity and removal efficiency of the spherical and flaky TiCT was investigated, respectively.

Fine-Tuning 2D Heterogeneous Channels for Charge-Lock Enhanced Lithium Separation from Brine.

The extraction of lithium (Li) from complex brines presents significant challenges due to the interference of competing ions, particularly magnesium (Mg⁺), which complicates the selective separation process. Herein, a strategy is introduced employing charge-lock enhanced 2D heterogeneous channels for the rapid and selective uptake of Li⁺. This approach integrates porous ZnFeO/ZnO nanosheets into Ag-modulated sub-nanometer interlayer channels, forming channels optimized for Li⁺ extraction.

Insights into Adsorption Behavior and Mechanism of Br onto Nickel-Aluminum Layered Double Hydroxides Intercalated with Different Inorganic Anions.

Layered double hydroxides (LDHs) have garnered significant attention from researchers in the field of adsorption due to their unique laminated structures and ion exchange properties. LDHs with various anion intercalation showed different adsorption effects on adsorbing ions, but the corresponding adsorption mechanisms are ambiguous. In this study, three types of NiAl-LDHs were synthesized, utilizing NO, CO, or Cl as the interlayer anions.

Regioselective Homolytic C-H Borylation of Unprotected Adenosine and Adenine Derivatives via Minisci Reaction.

A Minisci-type borylation of unprotected adenosine, adenine nucleotide, and adenosine analogues was successfully achieved through photocatalysis or thermal activation. Despite the challenges posed by the presence of two potential reactive sites (C and C) in the purine motif, the unique nucleophilic amine-ligated boryl radicals effortlessly achieved excellent C site selectivity and simultaneously avoided the formation of multifunctionalized products. This protocol proved effective for the late-stage borylation of some important biomolecules as well as a few antiviral and antitumor drug molecules, such as AMP, cAMP, Vidarabine, Cordycepin, Tenofovir, Adefovir, GS-441524, etc.

PPh-Promoted Direct Deoxygenation of Epoxides to Alkenes.

Deoxygenation of epoxides into alkenes is one of the most important strategies in organic synthesis, biomass conversions, and medicinal chemistry. Although metal-catalyzed direct deoxygenation provides one of the most commonly encountered protocols for the conversion of epoxides to alkenes, the requirement of expensive catalysts and extra reductants has largely limited their universal applicability. Herein, we report an efficient PPh-promoted metal-free strategy for deoxygenation of epoxides to generate alkene derivatives.

Thermally Stable and Transparent Polyimide Derived from Side-Group-Regulated Spirobifluorene Unit for Substrate Application.

Advancements in flexible electronic technology, especially the progress in foldable displays and under-display cameras (UDC), have created an urgent demand for high-performance colorless polyimide (CPI). However, current CPIs lack sufficient heat resistance for substrate applications. In this work, four kinds of rigid spirobifluorene diamines are designed, and the corresponding polyimides are prepared by their condensation with 5,5'-(perfluoropropane-2,2-diyl) bis(isobenzofuran-1,3-dione) (6FDA) or 9,9-bis(3,4-dicarboxyphenyl) fluorene dianhydride (BPAF).

Remote Mountainous Area Inevitably Becomes Temporal Sink for Microplastics Driven by Atmospheric Transport.

Atmospheric transport drives the widespread distribution of microplastic (MP) in various ecosystems, posing a growing potential threat to environmental safety and human health. Understanding the source and fate of atmospheric MPs is thus crucial to constrain MP's widespread exposure. However, the source-sink dynamics of atmospheric MPs, especially in remote areas, are uncertain, and their transport routes have yet to be identified.

Noncovalent Interactions-Driven Self-Assembly of Polyanionic Additive for Long Anti-Calendar Aging and High-Rate Zinc Metal Batteries.

Zinc anodes of zinc metal batteries suffer from unsatisfactory plating/striping reversibility due to interfacial parasitic reactions and poor Zn mass transfer kinetics. Herein, methoxy polyethylene glycol-phosphate (mPEG-P) is introduced as an electrolyte additive to achieve long anti-calendar aging and high-rate capabilities. The polyanionic of mPEG-P self-assembles via noncovalent-interactions on electrode surface to form polyether-based cation channels and in situ organic-inorganic hybrid solid electrolyte interface layer, which ensure rapid Zn mass transfer and suppresses interfacial parasitic reactions, realizing outstanding cycling/calendar aging stability.

Molecular weight-dependent differences in spectral properties and metal-binding behaviors of dissolved organic matter from different lakes.

Dissolved organic matter (DOM) plays an important role in governing metal speciation and migration in aquatic systems. In this study, various DOM samples were collected from Lakes Erhai, Kokonor, and Chaka, and size-fractionated into high molecular weight (HMW, 1 kDa-0.7 μm) and low molecular weight (LMW, <1 kDa) fractions for measurements of dissolved organic carbon (DOC), spectral properties, and metal binding behaviors.

Visible Light-Mediated Late-Stage Thioetherification of Mercaptopurine Derivatives.

We disclose herein a novel and general radical approach to alkylthiopurines, encompassing 4 types of thiopurines, as well as their corresponding ribosides. This strategy is achieved through visible light-mediated late-stage functionalization of the sulfur atoms of mercaptopurines. The in situ-generated disulfide was proposed as the pivotal neutral intermediate for this transformation.