ACS Applied Polymer Materials
·
2024
·
IF 4.4
Yunfei Liu,Yayu Feng,Yue Sun,Meijing Zhang,Pengfei Zhang,Ronghui Zhao,Kuilin Deng
In this investigation, a nonconjugated fluorescent polyamide with piperazine and valerolactam moieties (PAM–PV) has been synthesized by the modified Ugi polymerization using 1,4-bis(3-aminopropyl)piperazine, levulinic acid, and 1,4-bis(3-isocyanopropyl)piperazine as monomers. In the polymerization, the special construction of levulinic acid leads to the formation of valerolactam on PAM–PV chains via the Mumm rearrangement. PAM–PV shows a strong fluorescence emission at 428 nm due to the intramolecular aggregation of piperazine and valerolactam moieties along the backbone. Impressively, PAM–PV can specifically detect NO2– ions via static quenching with a linear range of 10–6–10–5 M and a detection limit of 0.6 μM (0.0276 mg/L), which was far less than the minimum allowable concentration of 3 mg/L for NO2– in drinking water specified by WHO. Furthermore, the several common anions and cations have no interference effects on the specific detection of PAM–PV to NO2– ions. The quenching mechanism of NO2– and PAM–PV by FTIR, UV, and 1H NMR measurements indicates that the strong electrostatic interaction between NO2– and PAM–PV makes the macromolecular chains more relaxed and outstretched, leading to a formation of a nonfluorescent complex. Moreover, the practical detection of NO2– in the three water bodies, sauerkraut, and ham sausage and the fabrication of a portable detecting paper to NO2– ions were conducted in this experiment.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2024
·
IF 8
Yuchen Hou,Yongjiao Sun,Yimeng Dong,Bingliang Wang,Zhiyuan Lu,Zihan Wei,Zhaomin Tong,Wendong Zhang,Koichi Suematsu,Jie Hu
A series of Au NPs decorated hierarchical In 2 O 3 /SnIn 4 S 8 microcubes were prepared by in-situ growing SnIn 4 S 8 nanosheets on the surface of In 2 O 3 microcubes and followed by reducing Au NPs on the surface of the hierarchical composite. The gas sensing performance of the sensors based on the as-prepared materials were systematically assessed. And the results showed that coverage of SnIn 4 S 8 and introduction of appropriate amount of Au NPs improved the gas sensing response of In 2 O 3 toward NO 2 at room temperature (RT). In particular, the sensor fabricated with 3 wt% Au NPs decorated In 2 O 3 /SnIn 4 S 8 exhibited excellent selectivity (S NO2 /S other > 12.6), high response (155.65–7 ppm NO 2 ), low theoretical limit of detection (LOD, 21.43 ppb), fast response/recovery time (132/191 s), good anti-interference performance, as well as repeatability and stability. The outstanding sensing performance at RT might be associated with a synergistic effect of heterostructures and the spillover effect of Au NPs, which could enlarge the electron depletion layer and promote the adsorption and dissociation of oxygen and nitrogen dioxide molecules.
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高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2025
·
IF 11.3
Jingwen Qian,Mingyi Yu,Zheng Lian,Shule Zhang,Qin Zhong
An innovative strategy in wet flue gas denitration technology was proposed to control nitrogen oxide emissions from cement kiln. Here the use of tetrabutylammonium bromide (TBAB) as an additive improved the absorption and utilization efficiency of sulfite absorbents for NO2. Compared with the sulfite solution, the stability time and absorption efficiency of adding TBAB were increased from 25 to 76 min and from 91.2 to 98.4%, respectively. Continuous absorption for 480 min indicated the feasibility of TBAB for repeated use. Moreover, we propose an antioxidant mechanism, including the capture of SO3•– by TBA+, and the reduction of SO3•– by Br–. The successive steps kept the sulfite from the cyclic depletion of the radical chain reaction of “Generate SO3•–-Introducing O2–Consuming SO32–” due to O2. A new application of TBAB in free radical trapping and antioxidant is given. Furthermore, a kinetic model describing the macroscopic absorption rate was developed based on different operating conditions.
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DOI
PubMed
高影响因子
ENERGY & FUELS
·
2020
·
IF 3.421
Zhao Zhang,Song Zhou,Hongyuan Xi,Majed Shreka
A high nitrate concentration in scrubber water is a major factor that restricts ship applications of NOx wet absorption technology. In this paper, an absorption system (Na2SO3/NaHSO3) that can effectively improve NO2 absorption and reduce the concentrations of nitrate and nitrite was studied. Several factors that affect the NOx absorption efficiency and the concentrations of nitrate and nitrite were investigated in a bubble reactor by using Na2SO3 and Na2SO3/NaHSO3. In addition, the reaction mechanism for the process of NO2 absorption was deduced. The results illustrate that increases in S(IV) concentration and initial NO2 concentration could enhance the NOx absorption efficiency while increases in the NO/NO2 ratio and SO2 concentration decreased the NOx absorption efficiency. Moreover, the maximum NOx absorption efficiency was 97.8% at 0.15 mol/L S(IV) and 1400 ppm of NO2 when using the Na2SO3/NaHSO3 absorption system. The S(IV) concentration was the main factor affecting the NOx absorption efficiency and the concentrations of nitrate and nitrite. Increasing the SO2 concentration slightly affected the NOx absorption efficiency but was beneficial for decreasing the concentrations of nitrate and nitrite. The performance of the Na2SO3/NaHSO3 absorption system was better than that of Na2SO3 in the presence of oxygen. Furthermore, the minimum concentrations of nitrate and nitrite were 13.5 and 0 mg/L, respectively, in the Na2SO3/NaHSO3 absorption system for 1100 ppm of NO2 and 0.3 mol/L S(IV) and were much lower than current regulations for scrubber water. Finally, compared with other experimental results, the Na2SO3/NaHSO3 absorption system exhibits great potential for ship NOx wet absorption, and the addition of NaHSO3 plays a key role in decreasing the concentrations of nitrate and nitrite.
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高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2019
·
IF 6.393
Yan Gong,Xiaofeng Wu,Xinyuan Zhou,Xiaofei Li,Ning Han,Yunfa Chen
The typical core-shell Pt@ZnO, 1 mol% Ga doped Pt@ZnO and 2 mol% Ga doped Pt@ZnO nanoparticles were synthesized and utilized in acetone and NO 2 sensing. Among those nanoparticles, 1 mol% Ga doped Pt@ZnO based sensor presents excellent acetone sensitive and interesting reversible switching from P- to N-type NO 2 sensing. The response of the 1 mol% Ga doped Pt@ZnO based sensor to 50 ppm acetone is as high as 296, and the detecting concentration limit to acetone and NO 2 is as low as 10 ppb and 20 ppb. The analogical binary p-n transition phase diagram was established to understand the NO 2 -sensing reversible switching as a function of operating temperature (T) and NO 2 gas concentration (C). The role of Ga doping in enhancing the sensing property and the mechanism of NO 2 p–n sensing transition is elaborated. In conclusion, the doping of Ga into core-shell Pt@ZnO was proved to be a feasible method for fabricating acetone and NO 2 sensor, with high sensitivity and selectivity.
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ACS Applied Nano Materials
·
2025
·
IF 5.5
Yingchun Dong,Jiongyue Hao,Yijie Shi,Yanqiao Ding,Wen Niu,Yuanting Yu,Hangyu Liu,Chun Huang,Yuhui He,Xiangshui Miao,Wei Hu,Yong He
Monitoring of reactive nitrogen by the Internet of Things (IoT) is urgently needed for sustainable nitrogen management to debilitate ill-health and achieve climate-stable. However, the real-time detection of nitrogen dioxide (NO2) at parts per billion (ppb) levels using a low-temperature chemiresistive gas sensor with high sensitivity and fast response and recovery remains a formidable challenge. In this study, we propose a facile one-step hydrothermal method for substituting nickel into tin selenide (SnSe) nanosheets, which effectively enhances the room temperature (RT) response/recovery speed and sensitivity of SnSe-based sensor toward NO2. The Ni-doped SnSe sensor with a vintage doping ratio exhibits an enhanced absolute response value of 20.06 times (58.99% vs 2.94%) toward 100 ppb NO2, compared to the pristine SnSe sensor, while also demonstrating a remarkable reduction in response/recovery time (10.32 s and 11.88 s vs 112.43 and 111.14 s). Moreover, the Ni-doped SnSe sensor exhibits remarkable selectivity and exceptional response stability. Through density functional theory (DFT) analysis, we demonstrate that the introduction of Ni atoms into the SnSe lattice generates deep impurity energy levels in the band structures, creating more active sites that enhance the interaction between the NO2 molecules and SnSe. Furthermore, these deep impurity energy levels contribute to the ultrafast response/recovery in detecting NO2 using Ni-doped SnSe. Our study presents a straightforward and effective strategy for the development of pollutant gas sensors that exhibit high sensitivity, low power consumption, and fast response/recovery.
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高影响因子
Frontiers of Chemical Science and Engineering
·
2017
·Vol. 11
·期 2
·205-210
·
IF 1.712
Zhou Shenghui,You Kuiyi,Yi Zhengming,Liu Pingle,Luo He’an
Metal salts with highly electronegative cations have been used to effectively catalyze the liquid-phase nitration of benzene by NO 2 to nitrobenzene under solvent-free conditions. Several salts including FeCl 3 , ZrCl 4 , AlCl 3 , CuCl 2 , NiCl 2 , ZnCl 2 , MnCl 2 , Fe(NO 3 ) 3 ∙9H 2 O, Bi (NO 3 ) 3 ∙5H 2 O, Zr(NO 3 ) 4 ∙5H 2 O, Cu(NO 3 ) 2 ∙6H 2 O, Ni (NO 3 ) 2 ∙6H 2 O, Zn(NO 3 ) 2 ∙6H 2 O, Fe 2 (SO 4 ) 3 , and CuSO 4 were examined and anhydrous FeCl 3 exhibited the best catalytic performance under the optimal reaction conditions. The benzene conversion and selectivity to nitrobenzene were both over 99%. In addition, it was determined that the metal counterion and the presence of water hydrates in the salt affects the catalytic activity. This method is simple and efficient and may have potential industrial application prospects.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Renjie Deng,Kuiyi You,Lei Yi,Fangfang Zhao,Jian Jian,Zhenpan Chen,Pingle Liu,Qiuhong Ai,He’an Luo
A mild and highly efficient method for solvent-free low temperature catalytic nitration of toluene with NO2 promoted by molecular oxygen has been developed in the present work. The immobilized AlCl3–SiO2 catalyst was successfully synthesized by a chemical bonding method. The results indicated that the synergistic catalysis of molecular oxygen and catalyst remarkably improved the nitration efficiency. Under optimal conditions, 86.5% of toluene conversion with 100% of selectivity to mononitrotoluene was achieved at 35 °C. Furthermore, the immobilized 10% AlCl3–SiO2 catalyst exhibited excellent stability in this nitration process. Finally, the probable reaction mechanism for the catalytic nitration promoted by molecular oxygen over AlCl3–SiO2 was suggested. This work affords a simple, highly efficient, safe, and benign approach for the preparation of valuable mononitrotoluene under the mild conditions and has potential industrial application prospects.
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高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2015
·Vol. 41
·期 11
·8307-8315
·
IF 1.221
You Kuiyi,Zhou Zhongcang,Jian Jian,Deng Renjie,Liu Pingle,Ai Qiuhong,Luo He’an
A simple method for the preparation of dinitronaphthalene from the nitration reaction of 1-nitronaphthalene with NO 2 as nitration reagent under the mild conditions has been successfully developed in this work. The results indicated that Ni(CH 3 COO) 2 ·4H 2 O catalyst shows better catalytic performances, and the conversion of 1-nitronaphthalene is 33.10 % with 34.10, 23.56, 19.30, and 3.56 % of the selectivity to 1,5-DNN, 1,3-DNN, 1,4-DNN, and 1,8-DNN, respectively, under the optimal reaction conditions. This is a mild, environmentally benign, and economical method for the preparation of dinitronaphthalene.
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高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2022
·
IF 10.753
Shengyan Jin,Lingdong Kong,Kejing Yang,Chao Wang,Lianghai Xia,Yuwen Wang,Jie Tan,Lin Wang
Free radicals and nitrogen-containing species produced by nitrate photolysis can affect various atmospheric chemical processes, and thereby the photochemical behavior of atmospheric nitrate aerosols has been attracting much attention. However, the photolysis mechanism of NH 4 NO 3 and its products under different atmospheric conditions remain unclear. In this study, the effects of relative humidity (RH), pH, NH 3 , ultraviolet (UV) light intensity and halogen ions (Cl − , Br − and I − ) on the photolysis of particulate NH 4 NO 3 have been investigated through a flow tube reactor. The results show that RH can significantly enhance the production of gaseous NO 2 from the photolysis of NH 4 NO 3 when RH is higher than its deliquescence RH, but almost no NO 2 is generated under dry conditions. Under high RH and UV light, the main product of NH 4 NO 3 photolysis is NO 2 , rather than NO and HONO, and another main species HNO 3 which mainly comes from the hydrolysis of product NO 2 in the gas path was detected. Almost no NO 2 and HNO 3 are produced under high RH without UV light or low RH with UV light, showing the combined effect of high RH and UV irradiation on the photolysis of NH 4 NO 3 . In addition, under high RH, the lower the pH and the stronger the light intensity, the higher the NO 2 production. Furthermore, surprising yields of NO and HONO are detected in the presence of halogen ions, especially in the presence of I − , indicating the important role of halogen ion in the nitrate photolysis. These results provide new insights into the photolysis of atmospheric nitrate aerosols, and may contribute to elucidating the formation and migration of atmospheric nitrate aerosols and the potential mechanisms of the occurrence and evolution of atmospheric pollution and ozone pollution.
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高影响因子
JOURNAL OF NANOPARTICLE RESEARCH
·
2022
·Vol. 24
·期 12
·1-14
·
IF 2.533
Lu Junfeng,Li Donglin,Chen Xianjia,Peng Xiaolin,Li Jing,Yang Yanting,Hong Bo,Wang Xinqing,Jin Dingfeng,Jin Hongxiao
Here, we demonstrate room temperature NO 2 sensors based on ZnO/rGO nanocomposites by a facile hydrothermal method. The ZnO nanoparticles (20 ~ 50 nm) were wrapped by film-like rGO with different contents (0.5, 1.0, 2.0, 3.0 wt %). They all exhibit p-type sensing toward NO 2 at room temperature. The content of rGO shows an obvious effect on the sensing properties. The ZnO NPs-1% rGO has a high response of 5.21 to 10 ppm NO 2 with a response/recovery time of 198/144 s. The sensing mechanism is discussed. The gas-sensitive properties are derived from the strong synergistic effect between the smaller particles of ZnO and rGO.
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高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2022
·
IF 9.965
Yaqing Zhang,Zhimin Yang,Liang Zhao,Teng Fei,Sen Liu,Tong Zhang
As promising sensing materials, reduced graphene oxide (RGO)-based nanomaterials have drawn considerable attention in the fields of gas monitoring owing to their low operating temperature. However, constructing RGO-based room-temperature gas sensors possessing ppb-level limit of detection with high sensitivity remains challenging. In this work, a series of highly sensitive NO 2 sensors were fabricated using α-Fe 2 O 3 and SnO 2 co-decorated RGO hybrids (designated as α-Fe 2 O 3 /SnO 2 -RGO) as sensing materials. They were rationally synthesized by a one-pot hydrothermal method. Compared to SnO 2 modified RGO hybrids (SnO 2 -RGO with bandgap of 3.88 eV), the bandgap energy of α-Fe 2 O 3 /SnO 2 -RGO hybrids (3.53 eV) was reduced by adding α-Fe 2 O 3; the narrower bandgap facilitated the sensing materials to release more electrons and form more oxygen ions at room temperature. Besides, the high carrier migration of RGO, which served as continuous phase, identical structure with ultrasmall particle size of α-Fe 2 O 3 and SnO 2 (about 3–6 nm), and abundant chemisorbed oxygen species on the surface (20.8%) of the sensing materials, as well as their suitable bandgap (3.53 eV) in the sensing materials, significantly improved NO 2 response at room temperature. Among the sensors fabricated, α-Fe 2 O 3 /SnO 2 -RGO-15-based NO 2 sensor had the highest response of 7.4 with a short response time of 59 s towards 1 ppm NO 2 ; it could even reach a response of 2.6 towards 100 ppb NO 2 . Notably, α-Fe 2 O 3 /SnO 2 -RGO-15 sample has excellent capability to recognize NO 2 , where the response value (7.4) towards 1 ppm NO 2 is about 7 times higher than that of 100 ppm ammonia and common volatile organic compounds (formaldehyde, toluene, ethanol and acetone). Such NO 2 sensor has superior repeatability with negligible response deviation towards 1 ppm NO 2 for four reversible cycles. This makes it to have a great potential application in the field of NO 2 detection.
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