MOLECULES
·
2023
·Vol. 28
·期 9
·3881
·
IF 4.6
Fengyi Wang,Ye Li,Chenglu Yan,Qiuting Ma,Xiaofeng Yang,Huaqiao Peng,Huiyong Wang,Juan Du,Baozhan Zheng,Yong Guo
The existence of carcinogenic nitrites in food and the natural environment has attracted much attention. Therefore, it is still urgent and necessary to develop nitrite sensors with higher sensitivity and selectivity and expand their applications in daily life to protect human health and environmental safety. Herein, one-dimensional honeycomb-like carbon nanofibers (HCNFs) were synthesized with electrospun technology, and their specific structure enabled controlled growth and highly dispersed bismuth nanoparticles (Bi NPs) on their surface, which endowed the obtained Bi/HCNFs with excellent electrocatalytic activity towards nitrite oxidation. By modifying Bi/HCNFs on the screen-printed electrode, the constructed Bi/HCNFs electrode (Bi/HCNFs-SPE) can be used for nitrite detection in one drop of solution, and exhibits higher sensitivity (1269.9 μA mM−1cm−2) in a wide range of 0.1~800 μM with a lower detection limit (19 nM). Impressively, the Bi/HCNFs-SPE has been successfully used for nitrite detection in food and environment samples, and the satisfactory properties and recovery indicate its feasibility for further practical applications.Keywords:nitrite sensor;honeycomb-like carbon nanofibers;Bi nanoparticles;nitrite detection
研究领域:
材料科学
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环境科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 14
·4431
·
IF 4.927
Xiangqian Li,Qin Wen,Jiannian Chen,Wenjie Sun,Yuhui Zheng,Chenggang Long,Qianming Wang
The presence of nitrite (NO2−) in water and food leads to serious problems in public health and the environment. Therefore, it is important to develop a rapid and efficient method for the selective detection of NO2−. In this work, the synthesis and characterization of magnetic Fe3O4@SiO2-TbDPA nanoprobe have been carried out. The Fe3O4@SiO2-TbDPA aqueous solution exhibits a strong green emission. Due to the addition of various concentrations of NO2−(0–100 μM), the fluorescence intensity has been suppressed. The nanoprobe Fe3O4@SiO2-TbDPA exhibits excellent selectivity and sensitivity toward NO2−ions. Excellent linearity is obtained in the range of 5–80 μM with a detection limit of 1.03 μM. Furthermore, the presence of magnetic Fe3O4nanoparticles in Fe3O4@SiO2-TbDPA nanospheres will also facilitate the effective separation of Fe3O4@SiO2-TbDPA from the aqueous solution. Our proposed strategy is expected to fabricate an organic-inorganic hybrid magnetic nanomaterial and can be used as an efficient sensor. It has been shown that this new strategy has numerous advantages, such as high stability, selectivity, and simplicity of operation. It demonstrates great potential for simple and convenient NO2−detection. It may expand to a variety of ranges in environmental monitoring and biomedical fields.Keywords:nitrite;core-shell nanospheres;fluorescent probe
研究领域:
分析化学
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环境科学
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生物医学工程
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DOI
PubMed
高影响因子
CHEMOSPHERE
·
2019
·
IF 5.108
Peng Yan,Kai Li,Jin-Song Guo,Si-Xi Zhu,Zhi-Kang Wang,Fang Fang
A dynamic analysis approach for determining nitrite production and consumption rates was established to systematically investigate the characteristics of nitrogen transformation and N 2 O emission of the completely autotrophic nitrogen removal over nitrite (CANON) process coupled with denitrification using a sequencing batch biofilm reactor (SBBR). The results indicate that anaerobic ammonium-oxidizing bacteria was not inhibited significantly by low C/N ratios. There were no obvious differences in the nitrite production rate, nitrite consumption rate or nitrogen removal among reactors operated with C/N ratios of 0, 0.67 and 1.00, which suggested that the certain carbon source did not significantly affect the nitrite conversion and nitrogen removal in the process. More than 60% of total N 2 O emission is generated during the initial phase of each period in the SBBR. More than 94.5% of N 2 O was generated by NO 2 − -N consumption via denitrification in the process. Interestingly, total N 2 O production drops by 16.7%, when the C/N ratio increases from 0 to 1. This phenomenon may be caused by the inhibition of N 2 O production via AOB denitrification. Therefore, an appropriate carbon source (C/N = 1.00) has the beneficial effect of reducing N 2 O emission by CANON coupled with denitrification. The results of this study provide an important empirical foundation for the mitigation of N 2 O emission in the CANON process coupled with denitrification.
研究领域:
环境工程
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微生物学
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污水处理
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DOI
PubMed
高影响因子
ENVIRONMENTAL RESEARCH
·
2025
·
IF 7.7
Kai Wu,Wenlong Wang,Shubing Yang,Xu Zhang,Peizeng Yang,Yuefei Ji,Jing Chen,Junhe Lu
As global warming intensifies freeze-thaw cycles, the understanding of environmental chemistry processes in ice and their potential impact on global water quality becomes increasingly important. This study investigated the transformation of 1-naphthol in the presence of nitrite (NO 2 - ) under slightly acidic conditions in ice, focusing on the formation of nitro-naphthol. Results demonstrated that increasing NO 2 - concentration enhanced the conversion of 1-naphthol and the formation of nitrated products. This transformation of 1-naphthol was attributed to the freeze-concentration effect, which led to the accumulation of H + , NO 2 - , and 1-naphthol in the liquid-like grain boundary layer amid ice crystals. In this brine, NO 2 - underwent protonation to form reactive nitrous acid (HNO 2 ) and nitrosonium ions (NO + ), which facilitated the nitration, nitrosation, and oxidative coupling reactions, respectively. The pH was shown to influence nitro products formation by altering the HNO 2 to NO + ratio. Toxicity assessment revealed increased toxicity of the NO 2 - /1-naphthol solution after freezing treatment, likely due to the formation of nitrated products, whereas natural organic matter (NOM) reduced this toxicity by suppressing the generation of nitrated products. The findings of this study advance the understanding of NO 2 - chemistry and the behavior of hydroxylated polycyclic aromatic hydrocarbons in cold environments.
研究领域:
环境化学
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物理化学
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化学毒理学
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大气化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
Catalysts
·
2021
·Vol. 11
·期 10
·1214
·
IF 4.146
Weilai Fu,Qiang Wang,Shuhui Chen,Yunshuang Wang,Yaru Wang,Peifeng Duan,Ganfeng Yi,Chao Liu,Xian Zhang,Zhiming Rao
Nitrogen pollution in water bodies is becoming increasingly serious, and how to remove nitrogen from water bodies economically and effectively has become a research hotspot. Especially in recent years, with the gradual expansion of aquaculture in China, the content of nitrite and other nitrogen-containing substances in water bodies has been increasing, which inhibits the growth of farm animals and is one of the causes of eutrophication in water bodies. In this study, a strain of bacteria was isolated from the sludge of an aquaculture fishpond and identified asPseudomonas stutzeri, which can efficiently degrade nitrite. After continuous domestication in nitrite mixed solution, the nitrite nitrogen reduction capacity ofP. stutzeriwas significantly improved. Univariate experiments aiming to optimize the degradation conditions indicate that the optimal culture conditions for strain F2 are: medium with a carbon source of sodium succinate; C/N of 18; pH of 8; culture temperature of 28 °C; and shaking speed of 210 rpm in the shaker. Under the optimal culture conditions, the NO2−-N concentration of the culture solution was 300 mg/L, and the nitrite removal rate reached 98.67%. Meanwhile, the results of the nitrogen balance test showed that the strain converted 6.1% of the initial nitrogen into cellular organic nitrogen and 62.3% into gaseous nitrogen.Keywords:nitrogen pollution;nitrite removal;domestication;Pseudomonas stutzeri
研究领域:
环境科学
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微生物学
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DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2021
·
IF 7.963
Jiajia Xu,Chao Li,Nanwen Zhu,Yanwen Shen,Haiping Yuan
The nitrite (NO 2 − ) inhibition in anaerobic ammonium oxidation (anammox) process is widely reported. Here, the effects of three pyrolytic biochars (CS300, CS550 and CS800) were investigated to alleviate NO 2 − stress on anammox process under exposure of varied NO 2 − -N concentrations (70, 200, 400 and 600 mg L −1 ). No nitrite inhibition was observed at 70 mg N L −1 . However, the total nitrogen removal efficiency (TNREs) decreased with NO 2 − -N concentration increased, while the biochar-amended groups achieved higher TNREs than the control (CK). At 200 mg N L −1 , the TNREs were 60.2%, 99.0%, 98.5% and 86.6% for CK, CS300, CS550 and CS800, respectively. At 400 mg N L −1 , the TNREs were 23.3%, 56.0%, 37.1% and 29.7% for CK, CS300, CS550 and CS800, respectively. At 600 mg N L −1 in which severe inhibition was observed, the TNREs were increased by 231% ( p = 0.002), 149% ( p = 0.014), and 51.0% ( p = 0.166) for CS300, CS550 and CS800, respectively, as compared to CK, with the corresponding specific anammox activity increased by 3.1-, 2,0- and 1.1-folds, respectively. CS300 enriched the relative abundance of Candidatus Kuenenia and increased the gene copies of functional genes ( hzs A, hdh , nir S and nir K). Besides, CS300 effectively alleviated the suppression of three membrane-associated enzyme complexes for anammox electron transport chain, indicating the possible contribution of redox-active moieties of CS300 to energy conversion metabolism for mitigating the NO 2 − -N inhibition. This study provided an effective strategy for alleviating NO 2 − -N stress by applying an environmentally compatible material (biochar) on anammox process.
研究领域:
环境科学
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生物技术
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废水处理
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DOI
PubMed
高影响因子
Frontiers in Environmental Science
·
2022
·
IF 5.411
Yu Bo,Lyu Kai,Li Jiajia,Yang Zhou,Sun Yunfei
Nitrite and ammonia are two of the most common toxic nitrogenous pollutants in aquatic ecosystem, which can pose a serious threat to the health of aquatic organisms. Cladocerans, as an important part of freshwater ecosystem, will inevitably be harmed by these pollutants. To evaluate the combined toxic effects of these nitrogenous pollutants on cladocerans, we simulated 15 combinations of five nitrite concentrations (0, 0.5, 2, 4, 8 mg L−1) and three ammonia concentrations (0, 0.1, 1 mg L−1) to study the changes of life history traits of Daphnia pulex exposed to these combinations for 21 days. Results showed that under the combined stress of nitrite and ammonia, the survival time of D. pulex was shortened, the time to first batch of eggs and time to first brood were delayed, the body size and tail spine length at maturation were reduced, and the total offspring and the number of broods were decreased. There were some synergistically negative effects between the two nitrogenous pollutants. The presence of ammonia reduced the tolerance of D. pulex to nitrite, and vice versa. These findings provided new insights into the combined toxic effects of nitrite and ammonia on the life history traits of cladocerans, and were of great significance for understanding the population dynamics of specific species in cladocerans community under the condition of compound nitrogenous pollutants.
研究领域:
生态毒理学
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环境科学
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DOI
高影响因子
JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2024
·
IF 4
Xiaoqi Weng,Jing Zhang,Yunxuan Duan,Jing Chen,Yuanting Zhu,Chen Xiao,Yong Zuo
In the present work, a new strategy for visual detection of nitrite in pickled mustards based on the principle of diazotization coupling reaction was proposed. Under acidic conditions, nitrite could induce the formation of the purplish red compound by reacting with sulfanilamide and N-ethylenediamine (NETH). The Euclidean distance (ED) presented a good linear relationship with nitrite concentration from 0.1 to 15 μg/mL (R 2 = 0.976). Additionally, the agar gel-based colorimetric test tube was further developed by combining the agar and reaction regents. The linear range of detection of colorimetric test tube for nitrite were 0.1–3 μL/mL and 5–20 μL/mL, respectively, demonstrating good quantitative analysis ability. The agar gel-based colorimetric test tube presented great selectivity and anti-interfering properties towards nitrite and was successfully applied for the detection of nitrite in different pickled mustards, demonstrating great practical application prospects. The proposed agar gel-based colorimetric test tube exhibits the advantages of simple preparation, convenient to carry, easy operation, fast reaction and data visualization, is beneficial for the real-time and on-site detection of nitrite, and is helpful for the food safety supervision of pickled mustards.
研究领域:
食品科学
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分析化学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2020
·
IF 6.182
Lanlan Gan,Qian Su,Zhangbao Chen,Xiaoming Yang
Detections of carcinogen and vitamins are generally recognized to be meaningful, especially for nitrites (NO 2 − ) and ascorbic acid (AA). Here blue-fluorescence carbon dots (CDs) with the quantum yield of 11.83% were successfully synthesized by using folic acid and nicotinic acid, and their surfaces were identified to be abundant in the functional groups of amide, carboxyl and hydroxyl. Importantly, the amide on the surfaces of CDs showed the interactions with the nitrites and formed the complex, thus resulting in their quenched fluorescence. To be specific, the fluorescence intensity of CDs proportionally decreased by adding the increased amounts of NO 2 − from 8 to 800 μM, and achieved the detection of NO 2 − at a detection limit of 21.2 µM. Moreover, further introducing ascorbic acid could prevent CDs with NO 2 − to form the complex and recover their fluorescence, and thus providing the new avenue of assaying AA with the generally favorable linear range of 0.1–800 μM, while its related detection limit was 50 µM. In addition, the synthesized CDs exhibited the satisfactory sensitivity toward different pH values, demonstrating their potential of sensing pH. Consequently, the proposed CDs here may provide a new way of monitoring NO 2 − and AA in the target samples.
研究领域:
分析化学
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生物医学
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产品关联
DOI
高影响因子
iScience
·
2023
·
IF 5.8
Ying Zhang,Yuying Wan,Xiaoxu Liu,Kai Chen,Ke Chu
Electrocatalytic reduction of nitrite to ammonia (NO 2 RR) is considered as an appealing route to simultaneously achieve sustainable ammonia production and abate hazardous nitrite pollution. Herein, atomically Nb-doped NiO nanoflowers are designed as a high-performance NO 2 RR catalyst, which exhibits the highest NH 3 -Faradaic efficiency of 92.4% with an NH 3 yield rate of 200.5 μmol h -1 cm -2 at -0.6 V RHE. Theoretical calculations unravel that Nb dopants can act as Lewis acid sites to render effective NO 2 - activation, decreased protonation energy barriers, and restricted hydrogen evolution, ultimately leading to a high NO 2 RR selectivity and activity.
研究领域:
材料科学
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环境科学
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催化化学
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DOI
PubMed
高影响因子
CHEMOSPHERE
·
2018
·
IF 4.427
Jing Xu,Heng Zhang,Tao Luo,Zizheng Liu,Jun Xia,Xiang Zhang
The effects of co-existing nitrogen species in surface water on the phototransformation of organoarsenical p -arsanilic acid ( p -ASA) have been investigated using a xenon lamp as a simulated solar light source. Significant enhancements of p -ASA phototransformation efficiency were observed in the presence of nitrate and nitrite, increasing with the concentration of these species and pH, whereas ammonia showed no obvious effect. The products, including inorganic arsenic species and organic derivatives, have been analyzed in order to reveal the phototransformation pathways. In the nitrate and nitrite systems, only small proportions of inorganic arsenic species were generated, with the majority of p -ASA being converted into other organoarsenical derivatives through hydroxylation, nitration, and nitrosation. Phototransformation of p -ASA in collected natural surface water was also observed. This work has implications for the phototransformation of p -ASA in nitrogen-contaminated surface water.
研究领域:
环境科学
·
水污染控制
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光化学反应
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产品关联
DOI
PubMed
高影响因子
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2018
·Vol. 410
·期 18
·4519-4526
·
IF 3.307
Du Jiayan,Zhao Mengxin,Huang Wei,Deng Yuequan,He Yi
We report a molybdenum oxide (MoO 3 ) nanomaterial-based three-input logic gate that uses Sn 2+ , NO 2 − , and H + ions as inputs. Under acidic conditions, Sn 2+ is able to reduce MoO 3 nanosheets, generating oxygen-vacancy-rich MoO 3− x nanomaterials along with strong localized surface plasmon resonance (LSPR) and an intense blue solution as the output signal. When NO 2 − is introduced, the redox reaction between the MoO 3 nanosheets and Sn 2+ is strongly inhibited because the NO 2 − consumes both H + and Sn 2+ . The three-input logic gate was employed for the visual colorimetric detection of Sn 2+ and NO 2 − under different input states. The colorimetric assay’s limit of detection for Sn 2+ and the lowest concentration of NO 2 − detectable by the assay were found to be 27.5 nM and 0.1 μM, respectively. The assay permits the visual detection of Sn 2+ and NO 2 − down to concentrations as low as 2 μM and 25 μM, respectively. The applicability of the logic-gate-based colorimetric assay was demonstrated by using it to detect Sn 2+ and NO 2 − in several water sources.
研究领域:
分析化学
·
材料科学
·
环境科学
✓ 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）