SCIENCE OF THE TOTAL ENVIRONMENT
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2024
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IF 8.2
Bo Zhang,Huaihao Xu,Han Zhang,Zhou Chen,Huiqun Shi,Shaohua Chen,Xiaojun Wang
Salinity is considered a major factor influencing nitrous oxide (N 2 O) emissions from biochemical treatment of high-salinity wastewater, but its mechanism has not been thoroughly investigated. In this study, we investigated the effects of salinity on N 2 O emissions under aerobic conditions. As salinity rose from 0.66 % to 3.66 %, N 2 O emission flux first increased and then decreased, while the emission factor (EF) consistently increased, likely due to significant inhibition of nitrification at 3.66 % salinity. Nitrogen‑oxygen dual isotope labeling experiments demonstrated that the dominant N 2 O production pathway shifted with salinity: from nitrifier nitrification (NN, 36.07 %–40.97 %) at low salinity (0.66 %, 1.66 %), to nitrification-coupled denitrification (NCD, 51.67 %) at 2.66 %, and to nitrifier denitrification (ND, up to 80.81 %) at the salinity of 3.66 %. From the changes in bacterial relative abundances and expressions of 4 key functional genes ( amoA , hao , nor , and nosZ ) revealed by metatranscriptomic sequencing, Nitrosomonas , unclassified Rhodospirillales , and Nitrospira were identified as key contributors to NN, NCD, and ND pathways, respectively, as salinity increased. We also found that the differential expressed genes and metabolites involved in energy metabolism, oxidative phosphorylation, and metabolism of amino acids, pyrimidines, and nucleotides may affect N-cycling bacteria, thereby influencing nitrogen conversion and salinity tolerance as well. This study sheds light on nitrification process in response to salinity stress and offers insights for mitigating greenhouse gas emissions from high-salinity wastewater treatment.
研究领域:
环境科学
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微生物学
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DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2023
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IF 7.2
Yong Jia,Xi Wu,Shiming Xu,Youwen Zhang,Sixue Wang
Hydrogen production and dye degradation can be achieved simultaneously in a hybrid system of reverse electrodialysis（RED）and electrocoagulation (EC), using current derived from the salinity gradient energy. Under the current, Fe electrode is used as the anode to produce Fe 2+ (subsequently oxidized to Fe 3+ ) which combines with OH − produced from the cathode to remove the dyes, while the hydrogen gas produced by the cathode is collected by a hydrogen collection device. The experiments are carried out to investigate the effects of different initial concentrations, pH, currents, electrode rinse solution (ERS) flow rates and the addition of chlorine on the degradation rate and hydrogen production. The results indicate that the degradation rate and hydrogen production could reach 98.3% and 150 m h −1 at alkaline condition (pH = 11) and acidic condition (pH = 3) respectively, with a current of 0.4 A. The degradation rate and hydrogen production increase significantly with an increase in current.
研究领域:
环境科学
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能源科学
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DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2024
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IF 8.4
Jiaqian Li,Chenxiang Li,Huimin Dou,Xiaojin Zhang,Yu Dai,Fan Xia
Salinity gradient (blue) energy has been identified as a promising power source and many technologies have been proposed for its recovery, one of which is nanopore power generators. The single-pore/channel membranes selectively transport ions to achieve efficient salinity gradient power generation. However, porous membranes fail due to concentration polarization. Here, we constructed a heterogeneous membrane by covering ion-selective hydrogel on a polyethylene terephthalate (PET) cylindrical nanochannel porous membrane for the first time to eliminate concentration polarization. The gel layer enhances the ion selectivity of cylindrical nanochannels, making heterogeneous membrane present the ion current rectification effect. The gel layer also avoids the negative impact of concentration polarization on the power generation of porous membranes. The results show that PET porous membrane can hardly generate electricity, but the power density of PET-hydrogel heterogeneous membrane can reach 1.92 W/m 2 under 50 times salinity gradient, which is superior to commercial ion exchange membranes. Our work provides a strategy (ion-selective hydrogel covering) to eliminate concentration polarization of porous membranes, and shows the prospect of cylindrical nanochannels for salinity gradient power generation.
研究领域:
材料科学
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能源工程
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环境科学
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DOI
高影响因子
Nature Communications
·
2024
·Vol. 15
·期 1
·1-15
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IF 14.7
He Pei,Yue Junyu,Qiu Zhennan,Meng Zijie,He Jiankang,Li Dichen
Electric eel is an excellent example to harness ion-concentration gradients for sustainable power generation. However, current strategies to create electric-eel-inspired power sources commonly involve manual stacking of multiple salinity-gradient power source units, resulting in low efficiency, unstable contact, and poor flexibility. Here we propose a consecutive multimaterial printing strategy to efficiently fabricate biomimetic ionic hydrogel power sources with a maximum stretchability of 137%. The consecutively-printed ionic hydrogel power source filaments showed seamless bonding interface and can maintain stable voltage outputs for 1000 stretching cycles at 100% strain. With arrayed multi-channel printhead, power sources with a maximum voltage of 208 V can be automatically printed and assembled in parallel within 30 min. The as-printed flexible power source filaments can be woven into a wristband to power a digital wristwatch. The presented strategy provides a tool to efficiently produce electric-eel-inspired ionic hydrogel power sources with great stretchability for various flexible power source applications.
研究领域:
材料科学
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生物医学工程
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能源技术
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DOI
PubMed
高影响因子
Energy & Environmental Science
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2011
·Vol. 4
·期 6
·2259-2266
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IF 9.488
Liuxuan Cao,Wei Guo,Wen Ma,Lin Wang,Fan Xia,Shutao Wang,Yugang Wang,Lei Jiang,Daoben Zhu
The widespread use of tiny electrical devices, from microelectromechanical systems (MEMS) to portable personal electronics, provides a new challenge in the miniaturization and integration of power supply systems. Towards this goal, we have recently demonstrated a bio-inspired nanofluidic energy harvesting system that converts salinity gradient energy from the ambient environment into sustainable electricity with single ion-selective nanopores (Adv. Funct. Mater. 2010, 20, 1339). The nanofluidic reverse electrodialysis system (NREDS) significantly improves the performance of conventional membrane-based reverse electrodialysis systems due to a higher ionic flux and a lower fluidic resistance. However, the fundamental working mechanism of the NREDS has been largely unexplored in the literature. In this work we have systematically investigated the performance of the NREDS in relation to the electrolyte type and the charge selectivity of the nanofluidic channel using both experimental and theoretical approaches. Experimental results show that the short-circuit current, the open-circuit voltage, and the resulting electric power of the NREDS are very sensitive to the ionic composition of the electrolyte solution. Through an in-depth theoretical analysis, two dominant factors that govern the charge separation and ion selectivity of the nanochannels were identified. The results prove that, with well-matched electrolyte types and nanopore charge selectivity, the harvested electric power and energy conversion efficiency can be improved by nearly two orders of magnitude.
研究领域:
纳米技术
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电化学
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能量收集
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微流控
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产品关联
DOI
高影响因子
Scientific Reports
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2025
·Vol. 15
·期 1
·1-10
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IF 3.9
Li Huan-Qin,Wang Wen-Lei,Shen Ying-Jia,Su Jian-Qiang
Microplastics (MPs) are emerging pollutants in mangrove ecosystems, with significant implications for microbial communities and nitrogen (N) cycling. However, the ecological processes shaping MP-associated microbial assemblages across environmental gradients remain poorly understood. Here, we conducted in situ and microcosm experiments to investigate microbial community composition and N-cycling gene abundance on three MP types—polyethylene (PE), polystyrene (PS), and polyvinyl chloride (PVC)—across salinity gradients (0–30 ppt) and under simulated tidal fluctuations over 35 days. High-throughput sequencing revealed distinct microbial communities on MPs compared to surrounding soils, dominated by Proteobacteria, Firmicutes, and Bacteroidetes. Bacterial diversity in PE and PS peaked at moderate salinity (10 ppt), while PVC-associated diversity declined with salinity. Structural equation modeling showed that salinity directly and indirectly influenced MP-associated diversity via soil microbial communities. During tidal cycling, microbial diversity on MPs increased over time, contrasting with declining diversity in soils. PS biofilms exhibited the fastest community turnover (R² = 0.79). MPs harbored significantly higher abundances of 15 N-cycling genes (except hao ) than soils ( P < 0.05), with PS and PE supporting the highest gene levels under salinity gradients and tidal exposure. Denitrification and nitrification gene abundances peaked at intermediate salinity (20 ppt) and day 14 of tidal simulation, respectively. These findings demonstrate that MP type, vegetation, salinity, and hydrological dynamics jointly regulate plastisphere development and microbial N cycling, highlighting the multifaceted ecological impacts of MPs in mangrove ecosystems.
研究领域:
环境科学
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海洋生物学
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微生物学
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生态学
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生物地球化学
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PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
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2022
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IF 10.53
Saidi Wang,Zhaoyi Wang,Yiyi Fan,Xiuxia Meng,Fukai Wang,Naitao Yang
The reverse electrodialysis (RED) is a potential technique to harvest osmotic energy caused by different salinities. Owing to the negative surface-charged controlling effects of nanofluidic channel in 2D membrane, the power density has been achieved with high energy conversion efficiency for cations (Na + with the counterpart of Cl − ). However, anion-selective nanofluidic channel is rare but still required for promising application of RED due to its high higher diffusion rate resulting in desirable osmotic power energy. In this work, we constructed a two-dimensional layered MXene membrane with positive charge via amination strategy of 3-aminopropyltriethoxysilane (APTES) toward anion selectivity for efficient osmotic power harvesting. The power density of the resultant membrane can achieve a maximum of 10.98 W m −2 at a natural salinity gradient, higher than the commercial benchmark of 5 W m −2 . Under regulating environmental conditions including operation temperatures, pH and the existence of pollutants (heavy metal ions and organic pollution) of the simulated electrolyte solution, a higher power density of 20.66 W m −2 can be reached through Cl − transmembrane transport. During 10-h testing, the attenuation of output power density was just 3%. The applicable stability still maintains under the contaminative environment of heavy metal ions or organic pollution. These results will bring an innovative design of anion-selective membrane for osmotic energy conversion and widen the practical application in ion selectivity.
研究领域:
材料科学
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能源工程
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环境科学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2024
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IF 7.7
Zhouyue Li,Ahmad Mehraj,Zhe Sun,Wenkai Fu,Sha Wang
Reverse electrodialysis (RED) systems employing charged nanochannels have gained prominence for harvesting salinity gradient energy. Nevertheless, fabricating nanochannel membranes with optimal ion selectivity and high energy conversion efficiency remains a significant challenge. In this study, we develop oppositely charged bacterial cellulose (BC)/polymer composite nano-channel membranes with precisely designed nanochannel architectures by integrating chemical modification with composite material technology. Initially, BC undergoes chemical modifications, including 2,2,6,6-Tetramethylpiperidine 1-oxy radical (TEMPO) oxidation and quaternisation. Subsequently, a polymer network is integrated into the modified BC network through a polymer synthesis technique. This approach successfully yields negatively charged BC/poly(sodium p-styrene sulfonate) (NBC/PSS) composite double-networked nanochannel membranes and positively charged BC/poly(dopamine) (PBC/PDA) composite double-networked nanochannel membranes. Notably, these membranes exhibit significantly enhanced ionic conductivities, with values of 0.0008 and 0.0014 S cm −1 for the NBC/PSS and PBC/PDA composites, respectively, while also demonstrating superior ion selectivity with cation transfer numbers of 0.9 and 0.1 respectively. Furthermore, a series connection of 30 BCE/charged polymer-based RED devices successfully powers an electronic calculator. This work offers novel insights into the design of BC-based RED devices by integrating chemical modification and polymeric composite strategies for efficient salinity gradient energy generation.
研究领域:
材料科学
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能源工程
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纳米技术
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环境科学
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产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
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2025
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IF 5.3
Yun Zhang,Xuemei Wang,Shangqing Zhang,Bicheng Liang
Harvesting osmotic energy from seawater–river water interfaces remains challenging due to the intrinsic selectivity–permeability trade-off in conventional ion-exchange membranes. Here, we fabricate large-scale Universitetet i Oslo-66 (UiO-66)/aramid nanofiber (ANF) nanocomposite membranes via an in situ polymerization method as high-performance osmotic energy generators. The UiO-66 layer, with its negatively charged surfaces and subnanometer channels, achieves near-ideal cation selectivity (0.99 and 0.98 under 5-fold and 50-fold concentration gradients), while the ANF scaffold’s three-dimensional (3D) fibrous nanochannels enable ultrafast cation diffusion (ionic permeabilities: 3.40 × 104 and 1.97 × 105 S m–2). This synergy effect yields record power densities of 16.46 W m–2 (50-fold) and 100.12 W m–2 (500-fold), surpassing state-of-the-art metal–organic framework (MOF) membranes (Materials of Institute Lavoisiers (MIL), Zeolitic Imidazolate Frameworks (ZIF), etc.) through precise angstrom-scale charge screening. What’s more, the high mechanical properties (tensile strength: 314.26 MPa; Young’s modulus: 9.96 GPa) endow the composite membranes with the scalable possibility of large-scale salinity gradient power generation. Under an enlarged testing area of 7 mm2, the maximum power density achieved a breakthrough of 1.93 W m–2. Combined with pH-responsive adaptability (140.86 W m–2 at a pH of 11) and 94.6% 30 day stability in harsh salinity gradients (0.01/5 M sodium chloride (NaCl)), this work establishes a paradigm for designing mechanically durable, large-scale nanofluidic systems to harvest blue energy efficiently across estuarine and industrial brine environments.
研究领域:
材料科学
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纳米技术
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能量收集
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膜科学
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电化学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
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2025
·
IF 19
Yuting Li,Xiang Liu,Mingxue Xiang,Peiduo Zhao,Yu Wang
Osmotic energy that harnessed from salinity gradients at river-sea interfaces represents an abundant renewable source, yet its exploitation is limited by the critical trade-off between ion selectivity and permeability of ion-exchange nanofluidic membranes. Herein, a Ti 2 AlC MAX phase derived photothermal nanofiber scaffolds integrated with 2D MXene nanosheet assembly is designed onto address this challenge. This design emphasized the mechanical robustness and reduced ion transport resistance of MAX phase nanofiber membrane, simultaneously utilized the exceptional cation selectivity of MXene, enabling >90% osmotic power density retention over 30 days. The heterostructure provides interfacial charge asymmetry to induce ionic current rectification that enhancing cation transport and suppressing concentration polarization, reaching a peak power density of 30.6 W m −2 for miniaturized systems (0.03 mm 2 ) and maintained 0.25 W m −2 for large-area modules (7800 mm 2 ). Furthermore, the photothermal response of MTM enabled solar-driven ion transport acceleration, increasing power output by 55% under illumination without physical contact. This structural-material synergy thus provided a capable solution between laboratory research and real-world applications, establishing a viable pathway for sustainable blue energy conversion.
研究领域:
材料科学
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能量转换
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纳米技术
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可持续能源
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电化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）