ANALYTICAL CHEMISTRY
·
2023
·
IF 7.4
Yao-Yu Pan,Bai-Chuan Zhao,Xin Zhang,Wei Zhu,Ai-Guo Shen
While the global COVID-19 pandemic has subsided, microbial aerosol detection has become of high concern. Timely, accurate, and highly sensitive monitoring of microbial aerosols in indoor air is the basis for effective prevention and control of infectious diseases. At present, no commercial equipment or reliable technology can simultaneously control the detection time and limit at 6 h and 102 CFU/mL, respectively. Based on the “safety size range” of particulate matter in the air, we propose a new method of microbial dilation detection, which enables the pathogen to grow rapidly and dramatically into a polymeric microsphere, larger in size than the coexisting aerosol particles. “Like a crane standing among chickens”, the microorganism can be easily visualized and counted. Different from routine chemical and biological sensing technologies, this method can achieve absolute counting of microbial particles, and the simple principles can be developed into devices for different life scenarios.
研究领域:
环境科学
·
生物技术
·
公共卫生
·
气溶胶科学
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产品关联
DOI
PubMed
高影响因子
FUEL
·
2025
·
IF 7.5
Xinyu Huang,Weiting Lin,Pengyin Lu,Zhichao Zhao,Jiawei Zhong,Jun Xie,Yong Chen
Robust Ni-based nanocatalysts supported on boron nitride nanosheets (BNNS), modified by Sm 2 O 3 , were synthesized via the co-impregnation and freeze-drying methods. The optimized 8Ni-8Sm 2 O 3 /BNNS catalysts demonstrated remarkable initial catalytic activity during the combined steam and dry reforming of biogas, achieving CH 4 and CO 2 conversions of 95 % and 46 %, respectively, and maintaining stable performance for 200 h. The introduction of Sm 2 O 3 improved the amount of moderately basic sites and enhanced the activation of oxygen-containing molecules including CO 2 and H 2 O, thereby promoting the formation of reactive oxygen species (e.g., O*, OH*) and effectively removing the coke precursors, significantly enhancing the carbon resistance. Moreover, the strong interaction between the small-sized Ni nanoparticles (NPs) and the BNNS support endowed the catalysts with excellent anti-sintering performance. The satisfactory catalytic performance of the 8Ni-8Sm 2 O 3 /BNNS catalysts can be attributed to the surface oxygen vacancies generated by Sm 2 O 3 , the moderately basic sites, and interaction between the highly dispersed Ni NPs and the BNNS support.
研究领域:
催化化学
·
能源材料科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Wen-Jie Yang,Dan-Dan Shao,Zhengzhong Zhou,Qian-Cheng Xia,Jian Chen,Xue-Li Cao,Tao Zheng,Shi-Peng Sun
In this article, novel nanofiltration (NF) membranes with highly selective surface and fast water and ion transport channels were fabricated for the valorization of biogas slurry. Unlike conventional thin film composite (TFC) membranes, the novel NF membranes compose hydrophilic carbon quantum dots (CQDs) as the interlayer. The carboxyl groups from CQDs react with the polyethyleneimine (PEI), leading to the lower cross-linking degree in the interfacial polymerization layer of NF membranes. Besides, the presence of the hydrophilic CQDs can create fast water and ion transport channels in the NF membranes. The water permeability of membranes is therefore enhanced significantly from 3.6 to 9.7 LMH·bar −1 . The NF membranes were used to concentrate the amino acids from biogas slurry; it achieved rejection rates above 90% towards model amino acids such as lysine, glutamic acid and leucine, due to its highly positive electrical properties, while allowing most of the unwanted salt ions to permeate through. The excellent selectivity between amino acids and salt ions demonstrates the great potential application of the NF membranes in biogas slurry valorization.
研究领域:
环境科学
·
材料科学
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DOI
高影响因子
COLLOID AND POLYMER SCIENCE
·
2024
·Vol. 302
·期 7
·1011-1023
·
IF 2.2
Yang Haiyan,Gong Yue,Wang Xinzhong,Chen Yuanyuan,Yu Dajiang
Polymer resin-based solid amine are prospective adsorbents used in removing CO 2 from biogas. Two commercial resins with different porous structures, AB-8 and ADS-17, were selected as supports to explore the influence of the support structures on adsorbent performance. It was discovered that macroporous channels greatly boost CO 2 adsorption at higher PEI loadings (≥ 30%), and their influence is more critical than total pore volume or specific surface area, though their impact is minimal at low PEI loadings. ADS-17-40% PEI demonstrated outstanding CO 2 adsorption of 208 mg·g −1 in its 16th cycle under specific operating conditions. Increasing gas flow rate to 200 mL·min −1 could promote CO 2 adsorption capacity and initial adsorption rate constant ( k 0 ) calculated by the deactivation model. The highest adsorption capacity was achieved at 55 °C, when the temperature ranged from 25 to 90 °C. Graphical abstract
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
IF 8.4
Ruohan Xia,Wancen Liu,Long D. Nghiem,Dingge Cao,Guoxue Li,Wenhai Luo
Biogas slurry from anaerobic digestion of organic wastes can be a potential biofertilizer for agricultural irrigation, which however, is challenged by suspended solids and contaminants. Thus, this study synthesized a composite coagulant and optimized its performance to advance biogas slurry treatment. A natural-synthetic polymer, chitosan (CTS), was modified by 2-methacryloxyethyltrimethyl ammonium chloride (DMC) via graft copolymerization and then combined with polyferric sulfate (PFS) to formulate the composite CTS-g(DMC)-PFS coagulant. Results show that CTS-g(DMC)-PFS exhibited stronger electrical neutralization and adsorption bridging to destabilize and aggregate colloidal particles, thus, exhibiting higher removal of suspended solids, heavy metals, and antibiotics over individual and pristine coagulants. Graft copolymerization of CTS with DMC at the mass ratio of 1:9 maximized its water solubility. Further blending this mixture with PFS at the mass ratio of 1:2 effectively improved the coagulation of biogas slurry, particularly for the removal of antibiotics and heavy metals (e.g. enrofloxacin and Cu). Moreover, CTS-g(DMC)-PFS produced dense and compact flocs for effective sedimentation. Detailed characterization attributed such improvement to the hydrolysis of cationic quaternary ammonium groups on grafted monomers and further coordinative effects between CTS-g(DMC) and Fe to enhance molecular chains and positive charges in CTS-g(DMC)-PFS to facilitate particle aggregation, contaminant adsorption, and then floc sedimentation.
研究领域:
环境科学
·
农业科学
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材料化学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 65
·60187-60195
·
IF 3.289
Chao Zhong,Chunming Wang,Fengxue Wang,Honghua Jia,Ping Wei,Yin Zhao
Lignocelluloses featuring complicated structure and poor degradability usually require pretreatments prior to their utilization; synergistic microbial systems are ubiquitous in nature and now exhibit appealing features that inspire mounting interest in developing functional microbial consortia for biotechnology development. In this study, we introduced a microbial consortium composed of bacteria and fungi that synergistically exhibited great abilities of lignocellulose degradation. A pretreatment of lignocelluloses by using this functional microbial consortium was designed and results showed that enhanced degradability in wheat straw and the broth containing amounts of organic materials (e.g. volatile fatty acids and carbohydrates) that could be used for biogas synthesis were detected in the pretreatment system. A subsequent anaerobic fermentation with the application of the pretreated system showed a 39.24% and 80.34% increase in total biogas and methane yield as well as a faster startup in a 20 day production process compared to the process based on the untreated system.
研究领域:
环境科学
·
微生物学
·
可再生能源
✓ 已验证
产品关联
DOI
高影响因子
Journal of Cleaner Production
·
2017
·
IF 5.715
Xiaochang Lin,Zhiying Han,Hongjun Yu,Zhangying Ye,Songming Zhu,Jun Zhu
A novel, two-chamber electrolysis cell equipped with an ion exchange membrane and a magnesium anode was proposed in this study to recover phosphate as struvite from both the simulated and real biogas digestion slurry of swine wastewater. In the electrolysis experiments with the simulated slurry, the optimal pH and current density were determined to be 8.5 and 22.2 A m −2 , respectively, achieving 95% phosphate removal efficiency and 100% current efficiency. The phosphate removal rate was mainly dependent on the magnesium dissolving rate. In the electrolysis experiments with the real digestion slurry, the pH of slurry increased from 7.4 to around 8.7 after the cathode-anode sub-section electrolysis without adding chemical reagents, achieving 93% phosphate removal efficiency at 22.2 A m −2 . The phosphate removal efficiency could be kept constant in three consecutive electrolysis cycles with both the anion exchange membrane and the cation exchange membrane . The cost of the magnesium anode treatment for the real biogas digestion slurry for struvite recovery was estimated to be $81.57 kg −1 P, mainly resulting from the consumption of electricity and magnesium anode. The precipitates collected from all experiments were identified as struvite by the X-ray diffraction analysis.
研究领域:
环境科学
·
废水处理
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Liming Liu,Zhurui Shen,Can Wang
In this study, two kinds of 2D materials (nanoscale mono/multi-layer MXene) were prepared, and a new visible-light-driven photocatalyst MXene@In 2 S 3 was synthesized by one-step hydrothermal preparation. Due to the better conductivity and larger specific surface area of the monolayer MXene, monolayer MXene@In 2 S 3 exhibited greater transient response photocurrent and smaller interfacial charge transfer resistance than those of multilayer MXene@In 2 S 3 under visible light irradiation. All these indicated that the synergistic effect of type-II heterojunction and TiO 2 /Ti 3 C 2 T x interface provided a shorter and more direct channel for electron transfer between In 2 S 3 , TiO 2 and MXene. When bioaerosol was sterilized by dynamic continuous flow photocatalytic reactor carrying monolayer MXene@In 2 S 3 , it can reach 1.55 lg in 9.6 s (multilayer MXene@In 2 S 3 was 1.19 lg). Biological particles of different particle sizes were effectively removed from the bioaerosol. The excellent photocatalytic disinfection performance was due to the oxidation substances (holes, ·O 2 – and ·OH) produced by the photocatalyst under visible light irradiation. Microbial cell membrane permeability was disrupted, causing irreversible physical damage that will ultimately lead to sustained inactivation within 16 h. Due to the unique physical and chemical properties of the two-dimensional material MXene, it has scope for further exploration in the field of disinfection and air purification.
研究领域:
材料科学
·
环境科学
·
微生物学
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产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2021
·
IF 8.742
Haifei Jiang,Zheyuan Guo,Hongjian Wang,Xin Liu,Yanxiong Ren,Tong Huang,Jiandang Xue,Hong Wu,Junfeng Zhang,Yan Yin,Zhongyi Jiang,Michael D. Guiver
COF (covalent organic framework)-based composite membranes offer the opportunity for breakthroughs in separation performance through endowing COFs with easy film-forming properties. However, tough challenges of poor filler dispersity, limited functionality and interfacial compatibility severely restrict the development of COF-based composite membranes. Therefore, the careful design of physical and chemical structures for COFs is urgently needed. Here, a geometry transformation strategy, i.e. converting FCTF-1 (fluorinated covalent triazine frameworks) from 2D nanosheets to 0D quantum dots (QDs), is implemented to overcome some of the challenges. The greatly decreased filler size increases the solvent dispersibility and processability of FCTF-1 quantum dots (QD-FCTF-1), giving rise to thorough mixing between the polymer matrix and quantum dot filler. Apart from the changes in physical characteristics of filler, the geometry transformation using piranha solution introduces chemical functionality at the quantum dot edges, further strengthens the interfacial compatibility through the hydrogen bond interactions between polar hydroxy and amidine groups of QD-FCTF-1 and nitrile groups of PIM-1 (polymer of intrinsic microporosity). Moreover, these edge polar groups intensify favorable gas sorption due to their high affinity to CO 2 molecules and thus significantly improve membrane gas pair selectivity. This work broadens the scope of framework-based materials and offers a new avenue for molecular separation.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2023
·
IF 8.7
Shengjie Chen,Fubing Yao,Zhoujie Pi,Li He,Kun Luo,Xiaoming Li,Qi Yang
Salts including NaCl are the most common food flavoring agents so they are often accumulated in food waste (FW) and have potential impact on anaerobic digestion (AD) of FW. In this study, the enhanced biogas production from two-stage anaerobic digestion (TSAD) of FW by microscale zero-valent iron (ZVI) under different salinity (3, 6, 9, and 15 g NaCl/L) was evaluated. Under salinity stress, ZVI becomes a continue-release electron donor due to the enhanced corrosion and dissolution effect and the slow-down surface passivation , further improving the performance of TSAD. Experimental results revealed that the biogas production including H 2 and CH 4 from TSAD with 10 g/L ZVI addition was promoted under salinity stress. The maximum H 2 and CH 4 yield (303.38 mL H 2 /g-VS and 253.84 mL CH 4 /g-VS) were observed at the salinity 9 g NaCl/L. Compared with that of zero salinity, they increased by 40.94% and 318.46%, respectively. Additionally, Sedimentibacter , an exoelectrogen that can participate in the direct interspecies electron transfer , also exhibited the highest relative abundance (34.96%) at the salinity 9 g NaCl/L. These findings obtained in this study might be of great importance for understanding the influence of salinity on the enhanced AD by ZVI.
研究领域:
环境工程
·
生物技术
·
微生物学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 25
·13798-13805
·
IF 2.936
Lianghu Su,Chenwei Liu,Kangkang Liang,Yudong Chen,Longjiang Zhang,Xiaolin Li,Zhihua Han,Guangyin Zhen,Xiaoli Chai,Xu Sun
The removal performance of high-concentration H2S (ca. 10 000 ppm) from simulated biogas by zero-valent iron nanoparticles (NZVI), with the majority of the particles in the size range of 60–150 nm, at different reaction temperatures (room temperature, 100 °C, 200 °C and 250 °C) were evaluated using a custom-designed quartz fixed-bed reactor. The results showed that the H2S removal capacities of NZVI were quite limited at room temperature and 100 °C, being 12.56 and 14.77 mg H2S gNZVI−1, respectively. However, these values increased significantly to 391.02 (200 °C) and 488.95 (250 °C) mg H2S gNZVI−1. Scanning electron microscopy analysis showed that the products of the NZVI–H2S reaction aggregated to form irregular polygonal-shaped structures. The main X-ray diffraction pattern peaks of the product matched well with troilite, and no pyrite was observed. The deconvolution of the X-ray photoelectron spectrometry peaks showed the presence of monosulphide (S2−) and disulphide (S22−) in the product, in which 36% of the sulphur existed as monosulphide and 64% as disulphide. It is proposed that the effective removal of hydrogen sulphide by NZVI at elevated temperatures can be attributed to the combination of nano-constituents, oxide shell and underlying Fe core to produce FeS similar to troilite and amorphous FeS2.
研究领域:
环境科学
·
化学工程
·
材料科学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2025
·
IF 11.3
Huaying Liu,Qisong Xing,Chenyu Zhu,Qineng Wang,Keding Lu,Song Guo,Zhijun Wu,Min Hu,Shao-Meng Li,Maosheng Yao
Endotoxin (lipopolysaccharide, LPS), widely distributed in the atmospheric environment with strong immunogenicity, is an important biological component of ambient particulate matter. However, whether LPS participates in atmospheric chemistry and how its biological health impacts change with the relevant processes are poorly understood. In this study, we employed the rat model to investigate the impact of ozone oxidation on the biological toxicity of LPS and used Fourier transform infrared spectroscopy and high-resolution electrospray mass spectrometry to study the underlying reaction mechanisms. The results show that the LPS can be oxidized by ozone and the resulting reactant greatly enhanced inflammatory anemia with a 177% capacity increase despite a minor influence on its immunogenicity. In contrast to the control, rats exposed to oxidized LPS were observed to release characteristic exhaled biomarkers, indicating that the formed reactant indeed altered the biological effects of LPS. Mechanistic investigation reveals that ozone oxidation of the hydroxyl group in the key toxic part of LPS, kdo2-lipid A, can cause dysregulation of iron homeostasis in rats, which is the mechanism of oxidized LPS-enhanced anemia. Unfortunately, these chemical structure changes and the resulting health impacts cannot be detected by the conventional LPS analysis method. This study highlights the changes in the toxicity of LPS and its health impacts when oxidized by ozone and the need to broadly consider the involvement of bioaerosol in atmospheric chemistry.
研究领域:
环境生物学
·
毒理学
·
医学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）