SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
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2021
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IF 4.098
Xueqing Guo,Yang Liu,Wenjuan Dong,Qin Hu,Yong Li,Shaomin Shuang,Chuan Dong,Lishuai Cai,Xiaojuan Gong
Azithromycin (AZM) 1 is one of the most widely used antibiotics. AZM abuse is easy to cause great harm to human body, so developing a rapid and sensitive method to detect AZM is of great importance. Herein, 3-aminothiophenol as only reaction precursor, nitrogen and sulfur co-doped carbon quantum dots (N,S-CQDs) 2 were fabricated by one-step hydrothermal carbonization method. All characteristics demonstrate that N,S-CQDs possess good water solubility, high fluorescence stability and low cytotoxicity. Without being disturbed by amino acids and drugs, the most interesting finding is that AZM can efficiently quench the fluorescence of N,S-CQDs by a synergistic effect of electrostatic interaction and static quenching. A fluorescent probe for the detection of AZM was constructed with high selectivity and good sensitivity, achieving two linear ranges of 2.5–32.3 μM and 37.2–110 μM and a limit of detection of 0.76 µM. The proposed fluorescent method was used for the detection of AZM in cells with fulfilling results. More importantly, the fluorescent probe was successfully used to the detection of AZM in tablets and human urine with recovery rate and relative standard deviations of 98.2–104.8% and 0.04–3.46%, respectively, which was confirmed by the standard method of HPLC-UV. This finding illustrates the usefulness and feasibility of N,S-CQDs as an effective fluorescent probe for the detection of AZM in tablets and human urine, which is helpful for supervising and guiding pharmacy.
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SCIENCE OF THE TOTAL ENVIRONMENT
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2020
·
IF 6.551
Nai-Xian Feng,Yu-Xi Feng,Qi-Feng Liang,Xin Chen,Lei Xiang,Hai-Ming Zhao,Bai-Lin Liu,Gang Cao,Yan-Wen Li,Hui Li,Quan-Ying Cai,Ce-Hui Mo,Ming Hung Wong
Phthalate acid esters (PAEs) are environmentally ubiquitous and have aroused a worldwide concern due to their threats to environment and human health. Di-n-butyl phthalate (DBP) is one of the most frequently observed PAEs in the environment. In this study, a novel bacterium identified as Pseudomonas sp. YJB6 that isolated from PAEs-contaminated soil was determined to have strong DBP-degrading activity. A complete degradation of DBP in 200 mg/L was achieved within 3 days when YJB6 was cultivated at 31.4 °C with an initial inoculation size of 0.6 (OD600) in basic mineral salts liquid medium (MSM), pH 7.6. The degradation curves of DBP (50–2000 mg/L) fitted well the first-order kinetics model, with a half-life ( t 1/2 ) ranging from 0.86 to 1.88 d. The main degradation intermediates were identified as butyl-ethyl phthalate (BEP), mono-butyl phthalate (MBP), phthalic acid (PA) and benzoic acid (BA), indicating a new complex and complete biodegradation pathway presented by YJB6. DBP might be metabolized through de-esterification, β-oxidation, and hydrolysis, followed by entering the Krebs cycle of YJB6 as a final step. Strain YJB6 was successfully immobilized with sodium alginate (SA), polyvinyl alcohol (PVA), and SA-PVA. The immobilization significantly improved the stability and adaptability of the cells thus resulting in high volumetric DBP-degrading rates compared to that of the freely suspended cells. In addition, these immobilized cells can be reused for many cycles with well conserved in DBP-degrading activity. The ideal DBP degrading ability of the free and immobilized YJB6 cells suggests that strain YJB6, especially the SA-PVA+ YJB6 promises great potential to remove hazardous PAEs.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
·
IF 7.489
Yang Zhao,Di Wu,Ying Chen,Yang Li,Xiaobin Fan,Fengbao Zhang,Guoliang Zhang,Wenchao Peng
Carbon materials are effective catalysts to activate peroxymonosulfate (PMS) for organic pollutant degradation. Both nitrogen doping and structural defects could enhance their catalytic performance for PMS activation. In this study, nitrogen-doped graphene (NG) is first synthesized by the calcination of graphene oxide (GO) with ammonium nitrate (NH 4 NO 3 ). The obtained NG is then annealed further at a higher temperature under a N 2 atmosphere to remove partially doped N atoms and create new structural defects. The obtained defective nitrogen-doped graphene (D-NG) can activate PMS for bisphenol A (BPA) degradation more effectively. Different annealing temperatures from 850 to 1150 °C are investigated, and D-NG synthesized at 1050 °C exhibits the highest activity. The enhanced catalytic performance is proposed to originate from the synergistic effect between doped N atoms and created structural defects. According to radical quenching, electron paramagnetic resonance (EPR), and electrochemical results, both radical and nonradical pathways are present during PMS activation, and the nonradical pathway plays the dominant role. This study provides a facile method for metal-free catalyst synthesis, which also enriches the synergistic mechanism between doped N and structural defects and thus should have great potential in wastewater remediation.
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SOLID STATE SCIENCES
·
2021
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IF 3.059
Lin Liu,Moying Li,Peng Jiang,Kunyang Cui,Yuqian Wang,Jianlei Kuang,Wenbin Cao
The solid solution of YIn 1- x Mn x O 3 shows intense blue colors as well as excellent properties. In this paper, N- and N/S- doped YIn 1- x Mn x O 3 samples are successfully prepared by the high-energy ball milling method with hexamethylenetetramine (C 6 H 12 N 4 ), urea (CH 4 N 2 O) and thiourea (CH 4 N 2 S). The X-ray diffraction patterns of samples with various anion doping all show single phase and the oxidation state of Mn are maintained as +3. In C 6 H 12 N 4 treated YIn 0.7 Mn 0.3 O 3 , N is in the interstitial site while in CH 4 N 2 O treated YIn 0.7 Mn 0.3 O 3 , N exists in both interstitial site and substitution site. In CH 4 N 2 S treated YIn 0.7 Mn 0.3 O 3 , both S and N are in the substitution site and interstitial site. Due to the anion doping by N and S, the optical properties of the samples are modified and analyzed.
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Entropy
·
2020
·Vol. 22
·期 12
·1337
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IF 2.494
Xiangfeng Tian,Lemeng Wang,Pan Zhang,Dong Fu
The surface tension and viscosity values of N-methyldiethanolamine (MDEA) aqueous solutions promoted by tetramethylammonium arginate ([N1111][Arg]) were measured and modeled. The experimental temperatures were 303.2 to 323.2 K. The mass fractions of MDEA (wMDEA) and [N1111][Arg] (w[N1111][Arg]) were 0.300 to 0.500 and 0.025 to 0.075, respectively. The measured surface tension and viscosity values were satisfactorily fitted to thermodynamic models. With the aid of experimentally viscosity data, the activation energy (Ea) and H2S diffusion coefficient (DH2S) of MDEA-[N1111][Arg] aqueous solution were deduced. The surface entropy and surface enthalpy of the solutions were calculated using the fitted model of the surface tension. The quantitative relationship between the calculated values (surface tension, surface entropy, surface enthalpy, viscosity, activation energy, and H2S diffusion coefficient) and the operation conditions (mass fraction and temperature) was demonstrated.Keywords:surface thermodynamics;viscosity;MDEA;[N1111][Arg]
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SYNTHETIC METALS
·
2020
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IF 3.286
Yucheng Yang,Siwei Yang,Guqiao Ding,Zhi Liu
Much attention has been focused on the fabrication approaches of graphene quantum dots (GQDs) with efficient, time-saving, environmentally friendly and controllable approaches, which is well relevant to further applications. In this paper, we demonstrated the self-feedback autocatalysis progress in photosynthesis of N doped GQDs (N-GQDs). N-GQDs can be obtained via the simple ultraviolet (UV) irradiation for the mixture of urea, citric acid (CA) and H 2 O 2 . No by-product was generated during the preparation process and the yield of N-GQDs is 94 wt%. Compared with GQDs obtained via previously reported methods, the highly homogeneous size of these N-GQDs (2.4–3.1 nm) demonstrated the outstanding morphological control capacity of our suggested approach. More importantly, we demonstrated the self-feedback autocatalysis progress is the key factor for the suggested efficient preparation approach. Such self-feedback autocatalysis polymerization progress under ultraviolet irradiation is a rapid and effective method to obtain N-GQDs with good morphology and optical properties . This ultraviolet excitation-induced mechanism can be a universal method for numbers of nitrogen-containing precursors.
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SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Li Li,Feng Xu,Ge Sun,Mingrui Sun,Shoushi Jia,Hongmei Li,Tao Xu,Honglian Zhang,Yan Wang,Yue Guo,Taohua Liu
The objective of this study was to establish a novel method for the determination of N-methylaniline (NMA) based on azo coupling reaction in infant pacifiers prepared with food contact silicone materials by combining thin layer chromatography (TLC) with surface-enhanced resonance Raman scattering (SERRS). TLC was used to separate the azo reaction products to confirm the component spot of azo compound, then the spot of azo compound mixed with silver sol on the TLC plate was qualitatively detected by SERRS. The limit of detection (LOD) of the method is as low as 0.50 ppm for NMA. The influence of sample matrix about the TLC-SERRS detection of NMA was investigated by experiment of simulated positive sample, and the NMA in infant pacifiers exposed to silica gel products was detected. The method of TLC-SERRS for the determination of NMA in infant pacifiers prepared with food contact silicone materials was established, and the real samples were detected. Compared with the methods ever reported, the method has the advantages of high sensitivity, specificity and low cost. It provides a new reference method for establishing a safety system for food contact silicone materials.
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JOURNAL OF HAZARDOUS MATERIALS
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2021
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IF 10.588
Songlin Zhao,Fushan Chen,Xiandi Zhu,Weijun Liu,Chenlin Wu,Jie Zhang,Shibin Ren,Zhengzhong Yan,Wenli Cao,Qunfeng Zhang,Xiaonian Li
In this study, a novel hierarchically porous N–doped carbon (HPNC) material was successfully prepared by soft-templating method. The commercial triblock copolymer of Pluronic F127 and a polyazine derived from hydrazine hydrate & glyoxal were used as soft template and precursor, respectively. The obtained materials were fully characterized and tested as a sorbent for the removal of hydrophilic dyes of Methylene blue (MB), Basic Fuchsin (BF), Eosin Y (EY) and Rhodamine B (RB) from their aqueous effluents. According to the characterization results, the synthesized material of HPNC-1000 presented thick fibrous morphology with micron size in diameter, hierarchically porous structure with surface area of 1853 m 2 /g, pore volume of 1.59 cm 3 /g and nitrogen content of 4.5 wt%. Adsorption-desorption investigation reveals that synergistic effect of hydrophobic interaction and hydrogen-bonding formation of the dye molecules with the sorbent was most pronounced in the adsorptions. The maximum adsorption capacities for MB, BF, EY and RB reached 0.83, 0.92, 1.23 and 1.83 mmol g −1 , respectively. The adsorption processes well fitted by the pseudo first-order kinetic model and the Liu′s isotherm. The sorbent can be regenerated by above 90% of the initial adsorption efficiency after six regeneration cycles.
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MICROPOROUS AND MESOPOROUS MATERIALS
·
2020
·
IF 4.551
Jian Wang,Congcong Wang,Hongchao Wang,Bo Jin,Peiping Zhang,Lina Li,Shiding Miao
The effective capture of radioactive volatile iodine ( 131 I and 129 I) from nuclear waste stream is of vital significance. In this work three kinds of porous organic frameworks (POFs) knitting with N -containing building units were constructed via cost-effective and maneuverable Scholl reaction. The obtained PAFs exhibited moderate porosity and satisfying thermal stability. With coexistence of open porous structure, the electron-rich amino group featured with π-π interactions was found to improve the affinity to iodine, and the iodine uptake capacities were 408 wt%, 335 wt% and 268 wt% when the prepared POFs of P-DPDA, P-TPB and P-PC were employed for the adsorption experiments. The results were superior to most of the porous adsorbents including zeolite , metal-organic frameworks (MOFs) and porous organic polymers (POPs). Iodine adsorption capacities of 289.50 mg g −1 (for P-DPDA), 194.63 mg g −1 (for P-TPB) and 259.69 mg g −1 (for P-PC) in organic solution were achieved, and the adsorbed iodine molecules could be released to ethanol. Such promising and cost-effective materials can be envisaged for application in the field of nuclear waste management.
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CHEMICAL ENGINEERING JOURNAL
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2020
·
IF 10.652
Yi Ding,Lixin Dai,Rui Wang,Haixiao Wang,Hengbin Zhang,Wei Jiang,Jun Tang,Shuang-Quan Zang
Optimizing the performance of electrode materials is crucial for improving the energy density of aqueous supercapacitors. Herein, a novel strategy inspired by biomimetic mineralization is developed to acquire a hierarchical flower-like Mn 3 O 4 @N, P-doped carbon (NPC) composite, which consists of multi-intercalated Mn 3 O 4 nanosheets and NPC cores. The Mn 3 O 4 nanosheets offer abundant active regions, and their C-O-Mn bonds with NPC ensure the fast electron transfer kinetics. It is noteworthy that the intercalation pseudocapacitance mechanism of Mn 3+ /Mn 4+ transformation in Mn 3 O 4 @NPC not only extends the potential window to 0–1.3 V (vs Ag/AgCl) but also significantly increased pseudocapacitance. Benefits from the advantages of structure and energy storage mechanism, the Mn 3 O 4 @NPC electrode delivers a high specific capacitance of 370.8 F g −1 and superior rate performance. A 2.6 V flexible aqueous asymmetric supercapacitor (FAAS) is fabricated by integrating Mn 3 O 4 @NPC cathode with an electrochemically reduced porous carbon anode and a PVA-Na 2 SO 4 hydrogel electrolyte. Notably, the FAAS delivers a high energy density of 76.96 Wh kg −1 as well as excellent rate capability. The device exhibited an excellent stability during 10,000 cycles and additional 240 h floating test. The strategy will pave the way for the development of electrode materials for FAASs.
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INORGANIC CHEMISTRY
·
2020
·
IF 4.825
Zi-He Meng,Song-Hai Wu,Shi-Wei Sun,Zhi Xu,Xiao-Cong Zhang,Xiang-Ming Wang,Yong Liu,Hai-Tao Ren,Shao-Yi Jia,He Bai,Xu Han
The MnII(HCO3–)–H2O2 (MnII-BAP) system shows high reactivity toward oxidation of electron-rich organic substrates; however, the predominant oxidizing species and its formation pathways involved in the MnII-BAP system are still under debate. In this study, we used the MnII-BAP system to oxidize As(III) in that As(III), Mn2+, and HCO3– are common components in As(III)-contaminated groundwater. Kinetic results show that MnII(HCO3–)n [including MnII(HCO3)+ and MnII(HCO3)2] is a key factor in the MnII-BAP system to oxidize As(III). Quenching experiments rule out contributions of OH• and 1O2 to As(III) oxidation and reveal that O2•– and the oxidizing species generated from O2•– play predominant roles in the oxidation of As(III). We further reveal that the MnO2+(HCO3–)n intermediate generated in the reaction between MnII(HCO3–)n and O2•–, instead of O2•–, is the predominant oxidizing species. Although CO3•– also contributes to As(III) oxidation, the high reaction rate constant between CO3•– and O2•– indicates that CO3•– is not the predominant oxidizing species in the As(III)-MnII-BAP system. In addition, the presence of Mn(III) further indicates the important Mn(II)–Mn(III) cycling in the MnII-BAP system. We therefore suggest two important roles of MnII(HCO3–)n in the MnII-BAP system: (i) MnII(HCO3–)n reacts with H2O2 to form the MnIII(HCO3)3 intermediate, followed by a subsequent reaction between MnIII(HCO3)3 and H2O2 to produce O2•–; (ii) MnII(HCO3–)n can also stabilize O2•– with the formation of MnO2+(HCO3–)n. MnO2+(HCO3–)n is an electrophilic reagent and plays the predominant role in the oxidation of As(III) to As(V).
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2020
·
IF 7.489
Song He,Guanyu Chen,Huan Xiao,Guibin Shi,Chichi Ruan,Yuansheng Ma,Huaming Dai,Bihe Yuan,Xianfeng Chen,Xiaobing Yang
Activated carbons (AC) were prepared by carbonization and KOH activation using rice husk as feedstock. The effects of impregnation ratios and activation temperatures on the properties of AC were investigated. Under optimum conditions, BET surface area, total pore volume and micropore volume of AC are as high as 1495.52 m 2 /g, 0.786 cm 3 /g and 0.447 cm 3 /g, respectively. Surface modification with chitosan as nitrogen source was performed simultaneously during KOH activation process. XPS and FT-IR analyses show that N -species was successfully incorporate into AC. Compared with AC-5 (general AC), CAC-5 (modified AC) exhibits better CO 2 adsorption performance, reaching 5.83 mmol/g at 273 K and 1 bar, which can be attributed to the formation of the CO 2 -philic active sites on AC surface by N -species. The linear correlations between CO 2 uptake, micropore volume within specific size section and N -content was investigated. The isosteric heat of CO 2 adsorption for CAC-5 (average 30.21 kJ/mol) is much higher than that of AC-5 (average 14.48 kJ/mol). The adsorption behavior of CAC-5 can be well described by Freundlich model. The high IAST selectivity factor for N -doped ACs indicates their excellent adsorption selectivity for CO 2 over N 2 . Both physisorption and chemisorption are present in CO 2 adsorption process of N -doped ACs.
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