Environmental Science-Nano
·
2026
·
IF 5.1
Lixia Li,Tao Jia,Zhichong Qi,Usman Farooq,Yanbin Ma,Fanyan Yang,Minghui Lv,Taotao Lu
Applying biochar as an amendment for the remediation of neonicotinoid pesticide-contaminated soils is a promising way to reduce the environmental risks posed by these pollutants. Rhamnolipid, a widespread glycolipid biosurfactant in soils, may regulate the transport of biochar colloids and/or pesticides in soil–water environments. Currently, critical knowledge gaps remain regarding how biosurfactant/biochar affects neonicotinoid pesticide mobility. Herein, rhamnolipid was employed to explore its influences on neonicotinoid pesticide (acetamiprid or nitenpyram) mobility and biochar colloid-affected mobility of pesticides at variable solution pH levels (5.0–9.0). In the binary system, rhamnolipid restrained pesticide transport owing to the biosurfactants' bridging effects, forming soil–biosurfactant–pesticide ternary complexes; similarly, biochar colloids also inhibited pesticide mobility because of colloid–pesticide complex deposited on soil surfaces. Notably, the degree of the inhibiting impacts of biochar/biosurfactant varied with pesticide types (acetamiprid > nitenpyram), which was attributed to differences in the chemical features of pesticides (e.g., hydrophobicity). Interestingly, the pH-dependent inhibition effects followed the order pH 5.0 > pH 7.0 > pH 9.0, which were ascribed to the different deposition amounts of biosurfactant molecules or biochar colloids. Surprisingly, in the ternary system, adding biosurfactant weakened the repressive influences of biochar colloids on pesticide migration over a broad pH range of 5.0 to 9.0 because of the reduced retention of colloid-associated pesticides and the great mobility of free neonicotinoid pesticides. Additionally, the degree of rhamnolipid's suppressive effects declined as the pH value increased. These findings provide critical insights into the environmental behaviors and fate of neonicotinoid pesticides influenced by ubiquitous biosurfactants in biochar-amended soils.
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Food Packaging and Shelf Life
·
2026
·
IF 10.8
Ke Zhang,Pingping Wang,Haiming Chen,Chun Chen,Xiong Fu
Conventional pH sensors relying on a single signal output are often compromised by external interferences, such as fluctuations in excitation intensity, environmental background noise, and subjective visual interpretation. To address this limitation, we developed fluorescence-colorimetric dual-responsive carbon dots (CDs) through a one-step hydrothermal synthesis using citric acid, o-phenylenediamine, and neutral red. These CDs serve as a robust functional material for non-destructive and rapid assessment of food freshness. As the pH increased, the CDs exhibited a distinct color shift from yellow to red under visible light, accompanied by a synchronous fluorescence enhancement showing linear correlation to ammonia in the range of 1–100 μmol/L (R 2 > 0.99). Integrated into filter paper-based indicator labels, the CDs retained excellent pH-responsive property, with clear visible and fluorescent color changes upon exposure to ammonia vapor. During shrimp storage at 4 ℃, the chromatic transitions of the labels under daylight correlated linearly with the total volatile basic nitrogen (TVB-N, R² = 0.99), enabling quantitative estimation. Spoilage was indicated on day 3 when TVB-N exceeded 30 mg/100 g, total viable count (TVC) reached 6.34 log 10 CFU/g, and indicator labels simultaneously turned red (ΔE = 7.29). The developed sensing system enabled real-time, convenient, and non-destructive visualization of pH changes, providing a reliable approach for monitoring shrimp freshness. This work offers a solid theoretical foundation and technical framework for the design of CD-based intelligent packaging systems in food quality surveillance.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2026
·
IF 5.4
Yanmei Sun,Bo Chen,Peng He,Ziqi Xu,Yan Dong,Shengchun Liu
The development of robust and flexible pH sensors is critical for accurate in-situ monitoring of marine environments, particularly for applications such as ocean acidification research and underwater vehicle-based sensing. In this study, we present a highly stable and flexible pH sensor based on iridium oxide (IrO x ) electrodes with potential for reliable operation in complex marine settings, based on its performance in laboratory-simulated conditions and long-term stability in real seawater. The sensor exhibits a near-Nernstian response with an average sensitivity of −65.07 mV/pH in aqueous solutions (pH 3–10), demonstrating excellent stability after 4000 bending cycles with minimal hysteresis. A rapid response time of 9.29 s and negligible potential drift (±5 mV over 5 min) highlight its precision and repeatability. While cation interference, particularly from Mg²⁺, induces slight potential shifts (4–5 mV), the sensor maintains its Nernstian behavior across all tested interferents including Na⁺, K⁺, Ca²⁺, and Mg²⁺. High-resolution measurements within the marine-relevant pH range (7.9–8.4) confirm excellent sensor performance with sensitivities exceeding −64.5 mV/pH. This targeted validation, combined with the sensor's exceptional mechanical flexibility, underscores its suitability for real-time pH monitoring in dynamic marine systems. These findings demonstrate the sensor’s potential for advancing marine chemistry research and environmental monitoring applications. Download: Download high-res image (123KB) Download: Download full-size image
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LANGMUIR
·
2026
·
IF 4.4
Xinyi Wu,Siqi Zhu,Siqi Zheng,Guoxiang Wang,Yong Gao
Enzymatic microreactors with sustainable operational stability have attracted significant interest in the development of green synthesis. In this work, a recyclable and pH-responsive enzymatic microreactor was constructed on the basis of high internal phase Pickering emulsions (HIPPEs). Oil-in-water HIPPEs were prepared via simple hand-shaking emulsification adopting amine-functionalized diblock copolymer nanoparticle/lipase complexes as Pickering emulsifiers. The amine-functionalized nanoparticles, composed of poly(oligo(ethylene glycol) methyl ether methacrylate)-b-poly(diacetone acrylamide), were synthesized through the combination of RAFT-mediated polymerization-induced self-assembly and subsequent hydrolysis. The obtained HIPPEs displayed reversible emulsification/demulsification behaviors triggered by protonation/deprotonation of amine groups on the surfaces of nanoparticles. When applied to the esterification of butyric acid with 1-butanol, the as-prepared HIPPE-based microreactor exhibited outstanding catalytic efficiency due to the large interfacial area and shortened diffusion distance provided by the high-internal-phase structure. Moreover, pH-triggered demulsification enabled convenient product separation and efficient recycling of the nanoparticle/lipase complexes for repeated catalytic runs, demonstrating good sustainability and promising potential for practical applications.
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CHEMISTRY OF MATERIALS
·
2026
·
IF 7.1
Liping Mao,Chengcheng Ma,Yunjing Wang,Qianhui Zhou,Lulin Hu,Lei Xu,Yu Zhang,Wenna Wu,Tao Zhang,Yi Yang,Lu Xu,Jingcheng Hao
Stimulus-responsive emulsions are ideal platforms for developing smart and clean liquid lubricants in view of their combined lubricating and cooling performances as well as good sustainability for achieving compositional separation and recycling. Nevertheless, current design strategies normally require complicated formulations and relatively high-cost and time-consuming preparations to fulfill the functional requirements for industrial tribological applications. Here we illustrate a paradigm for creating emulsion-based lubricants with long-term stability, convertible emulsification/demulsification, high and enduring lubricity, and tailorable friction and wear resistance simply by mixing a commercially available liquid extreme-pressure agent, which can provide lubrication and load-carrying capacity via tribochemical reactions with steel surfaces, with deionized water that can enhance its tribological properties by introducing additional heat dissipations using a commercially available anticorrosion agent capable of yielding low interfacial tensions and a pH-controlled emulsifying capability. Together with their excellent biocompatibility and scalability, our prepared water-in-extreme-pressure agent emulsions can serve as one kind of economical, safe, and smart liquid lubricant product.
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Polymers
·
2026
·Vol. 18
·期 9
·1087
·
IF 5.8
Lanxin Ke,Linqing Qian,Yincong Chen,Yanchen Ren,Meiqi Shi,Kun Wang,Ting Wang
Chlorogenic acid (CGA) is a natural polyphenol with various biological activities, but its poor stability and premature release in the gastrointestinal tract limit oral application. Herein, a pH-responsive bilayer hydrogel based on sodium alginate (SA) and carboxymethyl cellulose (CMC) was developed to enhance the gastrointestinal stability and controlled release of CGA. CGA-loaded SA hydrogels were prepared via Ca 2+ -induced ionotropic gelation, followed by CMC coating to form a bilayer structure. The SA/CMC hydrogels showed a drug loading capacity of 15.2–16.7% and pH-dependent swelling behavior. In vitro release studies revealed that the bilayer hydrogel suppressed CGA release in simulated gastric fluid (pH 1.2), with a cumulative release of approximately 30%, while enabling sustained release in simulated intestinal fluid (pH 6.8), reaching about 70% within 10 h. Release kinetics indicated that CGA release was controlled by Fickian diffusion under acidic conditions and by a diffusion-polymer relaxation mechanism under intestinal conditions. Moreover, encapsulation in the SA/CMC hydrogel improved the thermal, light, and pH stability of CGA while maintaining its antioxidant activity and biocompatibility. These results indicate that SA/CMC bilayer hydrogels provide a promising strategy for stabilized gastrointestinal delivery of chlorogenic acid.
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CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Zhihao Lu,Qinghua Liu,Yuchen Wang,Zihan Zhang,Yaning Liu,Jing Tang,Zhu Xian,Yu Chen,Chengshuai Jiang,Chao Ma,Gang Lu
Hydrogen evolution is accelerated via molecular surface assembly that regulates electronic structure and microenvironment • Anchoring amine-rich polyethyleneimine (PEI) onto Pt/g-C 3 N 4 composite realizes a HER rate of 28.34 mmol g −1 h −1 • The HER rate of Pt/g-C 3 N 4 /PEI improves to 40.40 mmol g −1 h −1 in simulated seawater • The incorporated PEI enhances the built-in electric field at interface, facilitating charge separation and transfer • The proton-buffering capability of PEI creates a alkaline microenvironment that accelerates water activation kinetics Photocatalytic hydrogen evolution in neutral or alkaline media is severely hampered by the sluggish kinetics of water activation/dissociation, which acts as the rate-limiting step. Guided by density functional theory (DFT) calculations, we report a simple yet effective surface assembly strategy to realize a significant enhancement in photocatalytic hydrogen evolution reaction (HER). The amine-rich polymer of polyethyleneimine (PEI) was strongly adsorbed on the surface of composite photocatalyst of Pt and graphitic carbon nitride (g-C 3 N 4 ). The PEI incorporation could not only strengthen the built-in electric field at the interface of Pt and g-C 3 N 4 , but also create a local alkaline environment due to the protonation of the amine groups. As a result, we achieved a remarkable HER rate of 28.34 mmol g −1 h −1 , more than double of the photocatalyst without PEI incorporation. The apparent quantum yield at 420 nm also dramatically increased from 3.1% to 9.5%. This PEI-induced HER enhancement reached its maximum in a neutral medium, helping to realize a high HER rate of 40.40 mmol g −1 h −1 in simulated seawater, which is neutral. This work opens up a feasible avenue for developing high-performance photocatalysts tailored for HER in neutral and weakly alkaline media. Download: Download high-res image (195KB) Download: Download full-size image
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ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Xincheng Cai,Junjing Duan,Zhangyi Huang,Lexing Liang,Zhenyu Zhang,Mao Deng,Xiaolan Zhou,Jianqi Qi,Tiecheng Lu
Y2O3–MgO composites are promising mid-infrared transparent materials for extreme environments. However, their optical and mechanical properties are limited by microstructural imperfections, including non-ideal phase fractions, excessive grain growth, and inhomogeneous phase distribution. Conventional coprecipitation struggles to synchronize precipitation of Y3+ and Mg2+ due to their divergent solubility products, leading to compositionally segregated nanopowders and degraded ceramic performance. To address this, we developed a coprecipitation–solvothermal coupling process with precision pH control (9.31–11.56) to manipulate dual-phase equilibria and microstructure. This strategy enhanced supersaturation to accelerate conucleation (via the Gibbs–Thomson effect), enabled complete Mg2+ precipitation at high pH (≥10.84), and achieved atomic-scale precursor homogenization. The pH-optimized nanopowders produced hot-pressed ceramics with a nearly perfect 1:1 phase volume ratio, ultrafine grains (129 ± 4 nm), and high phase homogeneity (αf > 0.9). These yielded excellent properties: 85% maximum transmittance at 6.2 μm (79% at 7 μm, the highest reported values), the broadest cutoff window (1.0–11.5 μm, approaching theoretical limits), and enhanced hardness (11.19 GPa) with toughness (2.43 MPa m1/2). This work introduces pH-mediated phase equilibrium control as a universal paradigm for designing high-performance oxide composites. By resolving fundamental precipitation mismatches, it establishes a general pathway for microstructural optimization in multifunctional ceramic systems.
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ACS Applied Bio Materials
·
2025
·
IF 4.7
Zhu Gao,Xinping Han,Wenyue Gao,Jianghua Li,Cuijuan Wang
Bacterial susceptibility testing and real-time inactivation are critical for safeguarding public health with broad applications in food safety monitoring and clinical diagnostics. For pH-dependent bacterial determination and hyperthermal inactivation applications, we developed needle-shaped ZnO/ZIF-L systems through a zeolitic imidazolate framework coating of zinc oxide by a self-template strategy. The pH-dependent ZnO/ZIF-L-embedded hydrogels were prepared by UV light-mediated olefin photopolymerization using acrylamide, N,N’-methylenebis(acrylamide), hydroxyethyl methacrylate, bromothymol blue (BTB), and ZnO/ZIF-L. The hydrogel achieves rapid visual detection of bacterial infections through a pH-responsive colorimetric transition, leveraging BTB to signal acidic microenvironmental shifts characteristic of bacterial proliferation. The ZnO/ZIF-L photosensitizers can enhance charge separation and transfer and generate highly reactive oxygen species. Escherichia coli and Staphylococcus aureus can be effectively inactivated for ZnO/ZIF-L hydrogels by a physical disruption/photodynamic synergistic antibacterial mechanism. The antibacterial efficiency can reach as high as 99%. The proposed strategy not only provides a sensitive strategy for bacterial determination but also implements efficient inactivation of bacteria simultaneously. This strategy combines real-time bacterial biosensing with on-demand antimicrobial action in a single platform, overcoming the limitations of conventional sequential detection-treatment approaches.
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CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yuling Ma,Yu Han,Yan Yang,Tao Zhang,Jinxin Yao,Yuchen Li,Zong Yongchen,Wei Wang
Lithium, a key element across diverse industries, is experiencing rapidly growing global demand. Liquid lithium resources, accounting for over 67 % of total lithium reserves, are primary targets for extraction. Among various extraction methods for liquid lithium, adsorption has shown great potential. Lithium ion sieves (LIS), especially titanium-based lithium ion sieves (LTO), are promising adsorbents but often exhibit poor performance under natural pH conditions due to interference from H + and Mg 2+ . Conventional LTO adsorption requires initial alkalization of the bulk solution to achieve satisfactory adsorption capacity, which leads to excessive alkali consumption and increased carbon footprint. Herein, a novel LTO adsorbent is reported, which achieves high lithium adsorption capacity under natural pH conditions. We doped LTO onto an organic carrier functionalized with quaternary ammonium groups and preloaded hydroxide ions onto these groups. The groups generate a positive electrostatic field that repels interfering cations such as Mg 2+ and H + , while the preloaded hydroxide promptly neutralizes the H + ions released during Li + exchange within the LTO structure. Together, these two mechanisms create a microscale confinement environment that accelerates Li + transport to adsorption sites. Under natural pH conditions, this confinement-effect adsorbent achieves a theoretical maximum adsorption capacity of 70.88 mg/g while reducing alkali consumption to 1/600 that required by traditional LTO adsorption, without the need to adjust the bulk solution pH. This innovative approach enables more efficient and sustainable lithium extraction and shows strong potential for real-world application.
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Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 3
·122734
·
IF 7.5
Zhenda Liang,Jiangpeng Li,Jian Liu,Yijun Pang,Li Zhou,Bing Yan
Cephalosporins are widely used β -lactam antibiotics frequently detected in aquatic environments, posing risks to ecosystem health and contribute to the dissemination of antibiotic resistance. Manganese dioxide (MnO 2 ) has attracted considerable attention as a low-cost oxidant for cephalosporin degradation. However, its performance is severely limited under neutral and alkaline conditions. Here, we demonstrate that defect-rich ε -MnO 2 achieved over 60% removal of eight representative cephalosporins at pH 7.0 through the combined contributions of Mn redox reactions and oxygen-vacancy-mediated reactive oxygen species (ROS) pathways. Fe doping further increased surface oxygen-vacancy density and catalytic activity, producing Fe- ε -MnO 2 with boosted degradation performance across a broad pH range (3.0–11.0). Using ceftriaxone as a model compound, mechanistic investigations revealed that singlet oxygen ( 1 O 2 ) dominated under neutral conditions, whereas hydroxyl radicals (•OH) became increasingly important under alkaline conditions, compensating for reduced lattice-mediated oxidation and partially suppressed 1 O 2 production. To facilitate catalyst recovery and practical application, Fe- ε -MnO 2 was immobilized in situ onto a commercial melamine sponge, forming a stable composite with effective performance in diverse real water matrices. Toxicity assays confirmed substantial detoxification of ceftriaxone after treatment. Overall, this study demonstrates that defect-rich MnO 2 combined with Fe doping provides an effective strategy for enhancing antibiotic degradation and expanding catalytic activity across a wide pH range.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2023
·Vol. 140
·期 23
·e53928
·
IF 3
Jiawen Fu,Haowei Pan,Mingzhe An,Zihao Li,Hong Wang,Xinping He,Chunhai Yi
Polyvinyl alcohol (PVA) is a promising membrane material for pervaporation (PV) desalination. However, the adjustment and control of the cross-linking structure is still a challenge for PVA membrane. In this study, a novel pH-resistant PVA-based composite membrane for efficient pervaporation desalination was developed by precisely adjusting the cross-linking behavior. Vinyl alcohol-vinylamine copolymer (VA-co-VAm) containing both hydroxyl and amino groups was synthesized. Cross-linking reaction was carried out based on the Schiff base reaction between amino groups (in VAm moiety) and glutaraldehyde (GA) under alkaline conditions. Cross-linking degree of PVA selective layer was carefully controlled by adjusting the amino group content in copolymer. Results showed that membrane prepared with VA-co-VAm that containing 5 wt% N-vinylformamide (NVF) displayed superior hydrophilicity and the largest free volume fraction. Pervaporation test indicated that the modified cross-linking membrane showed good stability under extreme pH conditions. Specifically, under strong acid conditions (pH ~ 1) and alkaline conditions (pH ~ 14), the membrane showed excellent desalination performance with water flux over 12 kg/(m 2 h), and the salt rejection higher than 99.95%. Based on the above results, the prepared membrane offers a promising platform for desalination under extreme pH conditions, which shows great potential in industrial wastewater treatment.
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