APPLIED SOIL ECOLOGY
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2026
·
IF 5.6
Minying Huang,Ying Chen,Fu Chen,Saige Xu,Yan Zhu
Plant invasions and microplastic (MP) pollution are widespread environmental challenges with increasing impacts on soil ecosystems. Although their individual effects on soil faunal diversity are well-documented, the interactive effects of these co-occurring stressors remain poorly understood. We investigated the short-term (two months) responses of soil faunal communities to conventional (low-density polyethylene, LDPE) and biodegradable (polylactic acid, PLA) MPs in habitats with and without invasion by Solidago canadensis L. We found that invasion by S. canadensis significantly increased overall abundance and richness of soil fauna, particularly microbivores. However, MP addition—either alone or in combination with plant invasion—did not significantly affect the abundance or richness of the total soil fauna or most trophic groups. Structural equation modeling revealed that MPs not only attenuated the positive effect of invasion on overall abundance by 48.4%, but also reversed its effect on richness from positive to a net decrease of 120.6%. Moreover, while S. canadensis invasion significantly altered soil faunal community composition in plots without MPs, this effect disappeared in most MP-amended treatments. These findings suggest that short-term MP pollution may alter the impact of S. canadensis invasion on soil fauna. However, the magnitude of MP effects varied across trophic groups, with microbivores exhibiting the most notable response. This study underscores the necessity of considering interactions among co-occurring environmental stressors in soil biodiversity assessments, as their combined effects can reshape outcomes for key functional groups within ecosystems.
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INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
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2026
·
IF 6.6
Zhuangli Cai,Shangchao Lin,Shaohong Yu,Shanyu Zheng,Xiaoshi Qian,Shengjie Ling
Polymers are important engineering materials due to their lightweight, electrical insulating, flexible, and durable features. However, their intrinsically low thermal conductivity hinders their wide application in solar cells, fuel cells, flexible electronics, and electronics packaging. In this work, aligning polymer chains using melt-shearing is demonstrated to be effective and scalable for tailoring the supramolecular structures at microscale. Thermal conductivity and elastic modulus of high-density polyethylene (HDPE) are highly enhanced using melt-shearing by 150% and 62%, respectively. The melt-shearing method significantly increases sample-effective thermal conductivity, a measure of polymer processing scalability, compared with other polymer alignment methods, such as microfiber drawing, nanofilm drawing, electrospinning and extrusion. Small-/wide-angle X-ray scattering (SAXS/WAXS) show that molecular chain alignment, crystal length (long periods), and thermal conductivity exhibit nonlinear trends with increasing the shear duration at low shear rates. At higher shear rates, the above three properties first increase and then approach plateau, due to the saturated impact from shear stress. Furthermore, the isothermal crystallization process after melt shearing only promotes crystal length, but not molecular alignment and thermal conductivity. This is mainly attributed to the chain relaxation after the cessation of melt shearing and the crystallization of kebab crystals. These findings unveil the molecular origin of microscale-modulation of polymers using scalable melt shearing and provide guidelines to large-scale manufacturing of thermally conductive polymeric functional devices.
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CHEMICAL ENGINEERING JOURNAL
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2026
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IF 12.5
Yizhe Liu,Weizheng Cheng,Yangzhe Xu,Modi Jiang,Benwei Fu,Chengyi Song,Wen Shang,Peng Tao,Tao Deng
Integrating low-cost hydrated salt phase change materials (PCMs) into buildings such as sunrooms represents an attractive strategy to mitigate temperature fluctuation caused by weather change and enhance thermal comfort without consuming extra energy. However, hydrated salts usually suffer from strong supercooling, low thermal conductivity, poor solar absorptance and leakage after melting, and conventional composite design cannot simultaneously overcome these shortcomings. In this work, we report the design and fabrication of multifunctional hydrated salt PCM composites through compression molding of sodium acetate trihydrate (SAT), disodium hydrogen phosphate dodecahydrate (DHPD), hydrophilic carbon nanotubes (CNTs) and expanded graphite (EG) into monolithic blocks and subsequent surface cross-hatch laser scanning and wax deposition. The optimal SAT composites loaded with 3 wt% DHPD, 2 wt% CNTs, and 16 wt% EG demonstrate a thermal conductivity of 7.49 W/m·K, a latent heat of 175.5 J/g, and a supercooling degree of 0.72 °C. Laser treatment amplifies surface roughness of the composites, which achieves a high solar absorptance of 97% and creates hydrophobic self-cleaning surfaces for automatic removal of dusts and solar-accelerated deicing. In sunroom thermal management tests, it reduces peak indoor temperatures by 15.3 °C and extends indoor comfortable durations through absorbing excessive solar heating at daytime and releasing stored latent heat after sunset. Such multifunctional hydrated salt PCM composites not only intelligently regulate the indoor temperature of sunrooms but also effectively prevent dust accumulation and ice formation on building surfaces, demonstrating broad applicability for passive thermal management under diverse weather conditions.
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Journal of Physical Chemistry C
·
2026
·
IF 3.4
Liangyi Gu,Daxi Pan,Jiahong Li,Xiaoshuang Li,Jian Wang,Bingtao Liu,Bo Wang,Youchao Kong,Qingguang Zeng
Zero-dimensional manganese halides offer distinctive luminescence but are limited by nonradiative losses, constraining their efficiency and tunability. Herein, we demonstrate a synergistic Zn2+ and Sb3+ doping strategy in (C8H20N)2MnCl4 to overcome these limitations. Initial Zn2+ alloying optimized the inter-Mn2+ distance, suppressing nonradiative energy transfer and boosting the inherent green Mn2+ emission (525 nm) to a 92.5% PLQY. Subsequent incorporation of trace Sb3+ ions created dual emissive centers, enabling broad white-light emission and a record PLQY of 98.4%. Combined spectroscopic and computational studies confirm that Sb3+ occupies both Mn2+ and Zn2+ sites, introducing specific defect states that steer energy into both triplet and singlet self-trapped exciton channels, alongside the Mn2+ transition. The optimized material exhibits superior thermal stability with a high activation energy barrier. Leveraging these properties, we fabricated a mechanically durable fluorescent film that serves as a highly sensitive temperature sensor (maximum relative sensitivity of 5.190% K–1), withstanding rigorous folding tests. This work establishes a potent doping paradigm for engineering high-performance 0D emissive halides and showcases their viable integration into flexible optoelectronic devices for advanced sensing applications.
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QUIMICA NOVA
·
2025
·
IF 0.7
Zhang Shuo,Yang Yuanrong,Meng Kun,Zhu Xinyong,Huang Longjiang,Sui Lina,Yu Liyan
To detect melamine in packaging materials, terahertz time-domain spectroscopy (THz-TDS) was employed to measure the terahertz absorption spectra of melamine-polyethylene mixtures with varying mass ratios (1:0-3). The results revealed distinct characteristic absorption peaks of melamine at 2.0, 2.28, and 2.6 THz. Among these, the peak at 2.0 THz was the most prominent and remained clearly observable even within packaging materials. Several common packaging materials, including low-density polyethylene (LDPE), high-density polyethylene (HDPE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), polyethylene terephthalate (PET), and paperboard, were examined individually to assess their spectral interference. Characteristic melamine absorption peaks at 2.0 and 2.28 THz were used to establish a calibration model based on Gaussian distribution functions. Based on the International Union of Pure and Applied Chemistry (IUPAC) method, the limit of detection (LOD) and limit of quantification (LOQ) were calculated to be 15 and 80%, respectively. Even at a concentration close to the LOD (10%), the signal remained distinguishable (signal/noise (S/N) > 3). X-ray powder diffraction (XRD) was utilized as a complementary technique to confirm the presence of melamine in the transparent plastic zip bag. These results support the effectiveness of THz-TDS in detecting melamine through packaging materials and highlight its potential application for detecting specific molecules in packaging materials.
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POLYMER DEGRADATION AND STABILITY
·
2026
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IF 8.1
Jianshuang Zhang,Anyang Tang,Shufen Zhang,Wenbin Niu
Converting waste polyethylene into valuable monomer compounds represents an ideal strategy to mitigate the accumulation of plastic waste. However, the chemical stability of the C–C backbone poses a formidable challenge for chain scission—state-of-the-art technologies are confined to specific polymers and lack practical utility. In this work, we used low-concentration nitric acid as an oxidant to convert low-density polyethylene (LDPE) waste into high-value-added dicarboxylic acids using a one-step hydrothermal method and used it for novel polyester synthesis. The degradation mechanism under nitric acid oxidation was systematically investigated by multiple characterization techniques. Under the conditions of 160°C and 0.20 g/mL nitric acid concentration with a 5 h, dicarboxylic acid was obtained with a high yield of 93% and a carbon yield of 37%. The resulting product was subsequently subjected to ring-opening polymerization with epoxy resin monomers, including the structurally rigid bisphenol A diglycidyl ether (DGEBA) and the flexible aliphatic polyethylene glycol diglycidyl ether (DGEG), yielding a novel degradable polymer with tailorable rigidity-flexibility properties. Systematic variation of the DGEBA:DGEG molar ratio from 1:1 to 9:1 produced corresponding changes in mechanical properties, with tensile strength increasing from 1.37 MPa to 24.69 MPa and elongation at break decreasing from 864.90% to 28.48%. This study breaks the exclusive dependence of polyester synthesis on petrochemical-based monomers. By partially replacing petrochemical monomers with those derived from waste polyethylene, it realizes the leap of waste polyolefin resources from low-level recycling to high-value feedstock utilization.
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CHEMICAL ENGINEERING JOURNAL
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2023
·
IF 15.1
Jinfang Kou,Jian Fang,Jianfeng Li,Huacheng Zhao,Mengmeng Gao,Gong Zeng,Wei David Wang,Fengwei Zhang,Jiantai Ma,Zhengping Dong
Selective catalytic hydrosilylation of alkenes for the synthesis of organosilicon products is very important in the fine chemical industry. Nevertheless, conventional Pt-based homogeneous catalysts are hindered by their low reaction selectivity, catalyst residues, and Pt leaching. In this study, a series of covalent organic frameworks (COFs)-anchored single-site Pt catalysts for achieving high-performance alkene hydrosilylation were prepared, and comprehensive characterizations confirmed that the actual coordination environment of Pt active sites is NS-Pt-Cl 2 . The resulting Pt(0.75%)@BTT-BPh-COF catalyst exhibited superior activity for the anti-Markovnikov hydrosilylation of alkenes with an excellent selectivity (>99%) under solvent-free conditions. Experimental and theoretical analysis revealed that the excellent catalytic performance is attributed to the effective charge transfer and strong coordination effect between Pt and S, N-co-doped COFs, which is conducive to the generation of electron-rich and highly active Pt single sites. High catalyst stability was maintained during recycling experiments due to the strong anchoring effect of the COFs support on atomically dispersed Pt single sites as well as the pore confinement effect. This study not only describes the precise design for the state-of-the-art catalysts with accurate active sites but also affords in-depth insights into alkene hydrosilylation.
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CHEMOSPHERE
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2022
·
IF 8.943
Jiaman Sun,Juan Luo,Rui Ma,Junhao Lin,Lin Fang
In order to reduce the risks of sulfur-containing contaminants present in biofuels, the effects of microwave and content of hydrogen donor on the cracking of C–S bonds and the migration of sulfur were studied by co–pyrolysis of biomass and plastic. The synergistic mechanism of microwave and hydrogen donor was explored from the perspective of deducing the evolution of sulfur–containing compounds based on microwave thermogravimetric analysis . By combining temperature–weight curves, it was found that microwaves and hydrogen radicals promoted the cracking of sulfur–containing compounds and increased the mass loss of biomass during pyrolysis . The mixing ratio of hydrogen donor (plastic) was the key parameter resulting in the removal of sulfur from oil. By adjusting the mixing ratio, the yield of co–pyrolyzed oil was three times higher than that of cow dung pyrolysis alone and the relative removal rate of sulfur reached 73.67%. The relative content of sulfur in the oil was reduced by 73.77% due to the escape of sulfur–containing gases (H 2 S, COS and C 2 H 5 SH) and the formation of sulfate crystals in the char. Microwave selectively heated sulfur–containing organics and hydrogen radicals stimulated the breaking of C–S bonds, which improved the cracking efficiency of the oil. This breaking will provide a theoretical and technological reference for the environmentally friendly treatment of biomass and biofuels.
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WATER RESEARCH
·
2023
·
IF 12.8
Beibei Hao,Haoping Wu,Yi You,Ying Liang,Lihua Huang,Yan Sun,Siyi Zhang,Bin He
As a ubiquitous emerging pollutant, microplastics can interact with algal and bacterial communities in aquatic ecosystems . Currently, knowledge on how microplastics influence algae/bacteria is mostly limited to toxicity tests using either monocultures of algae/bacteria or specific algal–bacterial consortium. However, information on the effect of microplastics on algal and bacterial communities in natural habitats is not easily available. Here, we conducted a mesocosm experiment to test the effect of nanoplastics on algal and bacterial communities in aquatic ecosystems dominated by different submerged macrophytes . The community structure of algae and bacteria suspended in the water column (planktonic) and attached to the surface of submerged macrophytes (phyllospheric) were identified, respectively. Results showed that both planktonic and phyllospheric bacteria were more susceptible to nanoplastics, and these variations driven by decreased bacterial diversity and increased abundance of microplastic-degrading taxa, especially in aquatic systems dominated by V. natans . The community composition of both algae and bacteria were influenced to varying degrees by nanoplastics and/or plant types, but RDA results showed that only bacterial community composition was strongly correlated with environmental variables. Correlation network analysis showed that nanoplastics not only reduced the intensity of associations between planktonic algae and bacteria (average degree reduced from 4.88 to 3.24), but also reduced proportion of positive correlations (from 64% to 36%). Besides, nanoplastics also decreased the algal/bacterial connections between planktonic and phyllospheric habitats. Our study elucidates the potential interactions between nanoplastics and algal-bacterial community in natural aquatic ecosystems. These findings suggest that in aquatic ecosystems, bacterial community are more vulnerable to nanoplastics and may serve as a protective barrier for algae community. Further research is needed to reveal the protective mechanism of bacteria against algae at the community level.
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Polymers
·
2023
·Vol. 15
·期 2
·268
·
IF 5
Chuanbo Liu,Chengqing Yuan,Shutian Liu
Ripple deformations induced by friction on polymeric materials have negative effects on the entire stability of operating machineries. These deformations are formed as a response to contacting mechanics, caused by the intrinsic mechanical properties. High-density polyethylene (HDPE) with varying silicon nitride (Si3N4) contents is used to investigate different ripple deformation responses by conducting single-asperity scratch tests. The relationship between the intrinsic mechanical properties and the ripple deformations caused by filler modifications is analyzed in this paper. The results show the coupling of the inherent mechanical properties, and the stick-slip motion of HDPE creates ripple deformations during scratching. The addition of the Si3N4filler changes the frictional response; the filler weakens the ripples and almost smoothens the scratch, particularly at 4 wt.%, but the continued increase in the Si3N4content produces noticeable ripples and fluctuations. These notable differences can be attributed to the yield and post-yield responses; the high yield stress and strain-hardening at 4 wt.% provide good friction resistance and stress distribution, thus a smooth scratch is observed. In contrast, increasing the filler content weakens both the yield and post-yield responses, leading to deformation. The results herein reveal the mechanism behind the initial ripple deformation, thus providing fundamental insights into universally derived friction-induced ripples.
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Marine Drugs
·
2023
·Vol. 21
·期 1
·47
·
IF 5.4
Xin-Nan Teng,Shu-Chang Wang,Liaqat Zeb,Yue-Sheng Dong,Zhi-Long Xiu
Antarctic krill is a crucial marine resource containing plenty of high-valued nutrients. However, krill oil as a single product has been developed by the current solvent extraction with high cost. From the perspective of comprehensive utilization of Antarctic krill, this study proposed a novel two-step enzymolysis-assisted extraction in attempt to produce value-added oil and enzymolysate simultaneously. After two-step chitinase/protease hydrolysis, the lipid yield increased from 2.09% to 4.18%, reaching 112% of Soxhlet extraction. The method greatly improved the yields of main components while reducing the impurity content without further refining. After optimization, the oil contained 246.05 mg/g of phospholipid, 80.96 mg/g of free eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), and 0.82 mg/g of astaxanthin. The by-product enzymolysate was abundant in water-soluble proteins (34.35 mg/g), oligopeptides (13.92 mg/g), amino acids (34.24 mg/g), and carbohydrates (5.79 mg/g), which was a good source of functional nutrients. In addition, both oil and enzymolysate showed high antioxidant capacity. This novel method could simultaneously provide oil and enzymolysate amounting for 58.61% of dried krill.Keywords:Antarctic krill oil;enzymolysis;protease;chitinase;extraction
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ACS Nano
·
2023
·
IF 17.1
Dong Liu,Shahid Iqbal,Heng Gui,Jianchu Xu,Shaoshan An,Baoshan Xing
To understand microplastic–nanomaterial interactions in agricultural systems, a randomized block 90-day pot experiment was set up to cultivate ryegrass seedings in a typical red sandy soil amended with compost (1:9 ratio). Polyvinyl chloride (PVC) and polyethylene (PE) microplastic (MP) contaminants were added into pot soils at 0.1 and 10%, whereas nano-Fe3O4 (as nanoenabled agrochemicals) was added at 0.1% and 0.5% in comparison with chemical-free controls. The combination of nano-Fe3O4 and MPs significantly increased the soil pH (+3% to + 17%) but decreased the total nitrogen content (−9% to – 30%; P < 0.05). The treatment group with both nano-Fe3O4 and PE had the highest total soil C (29 g kg–1 vs 20 g kg–1 in control) and C/N ratio (13 vs 8 in control). Increased rhizosphere nano-Fe3O4 concentrations promoted ryegrass growth (+42% dry weight) by enhancing the chlorophyll (+20%) and carotenoid (+15%) activities. Plant leaf and root peroxidase enzyme activity was more significantly affected by nano-Fe3O4 with PVC (+15%) than with PE (+6%). Nano-Fe3O4 significantly changed the ryegrass bacterial community structure from belowground (the rhizoplane and root endosphere) to aboveground (the phylloplane). Under MP contamination, the addition of nano-Fe3O4 increased bacterial diversity (+0.35%) and abundance (+30%) in the phylloplane and further intensified the connectivity of ryegrass aboveground bacterial networks (positive association increased 17%). The structural equation model showed that the change in the plant microbiome was associated with the rhizosphere microbiome. Overall, these findings imply the positive influences of nano-Fe3O4 on the soil–microbe–plant system and establish a method to alleviate the harmful effects of MP accumulation in soils.
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