Journal of Materials Chemistry C
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2024
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IF 5.7
Yining Chang,Ran He,Runqiu Wang,Yanli Wei,Li Wang
Nitrophenols are manufactured chemicals used in making industrial products and released from auto exhaust. Once nitrophenols enter the soil, the phytotoxicity causes forest decline. Exposure to nitrophenols will result in adverse health effects, such as cataracts, cyanosis and potential carcinogenicity. Based on structural matching, this study describes a sensing system of 2-hydroxylpropyl-β-cyclodextrin (HP-β-CD) modified sulphur quantum dots (HP-SQDs) for the selective detection of para-nitrophenol (p-NP). HP-SQDs are synthesized by the assembly fission method. The cyclodextrin-based molecular cages detected p-NP selectively by fluorescence quenching, which resulted from the structural matching and photoinduced electron transfer (PET) between p-NP and HP-β-CD. The inclusion of nitrophenols in cyclodextrin cages causes the decreased fluorescence intensity of HP-SQDs, with the detection limit of 0.25 μmol L−1 for p-NP. The theoretical calculation of the binding energy and inclusion constant between HP-β-CD and nitrophenols reveals the high selectivity of p-NP over other isomers by HP-SQDs. This fluorescent cage sensing approach provides a new idea for the identification of isomers.
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Journal of Water Process Engineering
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2024
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IF 6.3
Ahsan Nazir,Ameena Tur Rasool,Pengwei Huo,Muhammad Saqaf Jagirani
This research used a facile chemical precipitation-photoreduction technique to fabricate a plasmonic p-n heterojunction Ag@Ag 2 O-PbBiO 2 Br (A@AO-PB) photocatalysts. The resulting materials were evaluated using various characterization techniques. Levofloxacin (LEV; 100 ml, 20 mg/l) and tetracycline (TC; 100 ml, 20 mg/l) were successfully photodegraded by the optimized 10 min-A@AO-PB (50 mg) in 120 min under visible light, with efficient degradation rates of 80.6 % and 87.0 %, respectively. The increased absorption of visible light by local surface plasmon resonance (LSPR) of plasmonic Ag and the effective separation and transfer of photogenerated carriers could be the reasons for the increase in efficiency of A@AO-PB. Transient photocurrent response (TRP), electrochemical impedance spectroscopy (EIS), and photoluminescence (PL) studies have all confirmed that 10 min-A@AO-PB effectively separates and transfers photogenerated carriers. In addition, scavenger studies have shown that the dominant active species that participated in the removal of LEV and TC are h + and •O 2 − . To find intermediates, the potential photodegradation pathways of LEV and TC were also investigated through HPLC-MS. Thus, this work describes a new photocatalyst design and a desirable plasmonic photocatalyst with p-n heterojunction that can effectively degrade LEV and TC antibiotics when exposed to visible light.
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INDUSTRIAL CROPS AND PRODUCTS
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2024
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IF 5.6
Ni Wei,Xin Xu,Jiushun Qin,Wei Lai,Ruoyan Li,Chenhuan Lai,Qiang Yong
Development of green pretreatment strategies with excellent lignin removal ability is particularly important for masson pine biorefinery. γ-Valerolactone (GVL), as a green and recyclable solvent, has unique solvent characteristics to extract lignin. In this study, three acid catalysts, including sulfuric acid (H 2 SO 4 ), hydrochloric acid (HCl) and p -toluenesulfonic acid (TsOH), were used to catalyze γ-valerolactone (GVL) pretreatment of masson pine. Among them, the TsOH-catalyzed GVL pretreatment achieved the highest lignin removal ratio and the best cellulose enzymatic hydrolysis yield. Under the optimized pretreatment conditions (150 ℃, 150 mM TsOH, GVL/H 2 O (4:1, w/w), 1 h), the lignin removal ratio reached 89.0 %, achieving a 72 h glucose yield of 87.1 % from the pretreated residues. The solvent lignins from pretreatment liquid was separated and characterized by NMR analysis. Meanwhile, the hexoses in pretreatment liquid were further converted into levulinic acid (LA) using the TsOH-catalyzed bi-phase reaction systems. This study gives insights into developing a biorefining process for the effective utilization of masson pine.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2024
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IF 8.1
Yuan Zhang,Kangping Cui,Xueyan Liu,Minshu Cui,Xing Chen,Yuchao Tang,Haiyang Li
Metal-based catalyst could be used for efficient peroxymonosulfate (PMS) activation, but inevitably suffered from metal ion leaching. Metal-free graphitic carbon nitride (g-C 3 N 4 ) materials that can activate PMS are more conducive for practical water treatment. In this study, g-C 3 N 4 with both N-defects and P-doping (CN-NP) was synthesized, which mainly produce singlet oxygen ( 1 O 2 ), and 97 % of 4-CP (4-Chlorophenol) was removed by CN-NP/PMS/Vis reaction system within 60 min. The active species was identified by quenching experiments and electron spin resonance (ESR) tests, and the origin of mainly active species was further verified by the concentration change of PMS during the reaction. It was verified by experiments and theoretical calculations that the introduction of N-defects led to the separation of photoinduced electron-hole pairs and improved photocatalytic activity. Notably, density functional theory (DFT) revealed that both N-defects and P-doping are electron-deficient sites, and P-doping acts as the main PMS adsorption site to promote the loss of electrons from PMS to generate 1 O 2 . In addition, the catalysts developed in this research were anticipated to be applied in real wastewater treatment, contributing to further comprehend the mechanisms of element doping and defect modification in g-C 3 N 4 activating PMS, and providing new insights for the design of PMS-activating catalysts.
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Sustainable Materials and Technologies
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2024
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IF 8.6
Lei Guo,Yan-He Chen,Li-Mei Xu,Xiao-Lu Chen,Jin-Qiu Shen,Jian-Yong Zhang,Zhen-Jiang Liu
Herein, a fern-like p-n heterojunction by anchoring Ni 3 Fe-LDH nanoplates onto Co 3 O 4 nanoneedles have been optionally constructed. Essentially, p-n heterojunction ensured to induce strong built-in electric field, and inherit interfacial electron redistribution. Based on their compatible and well-matched electronic band structures, a staggered type-II photo-generated electron/holes transfer pathway have been elaborated by density functional theory calculation (DFT), in situ irradiation X-ray photoelectron spectroscopy (XPS), and fluorescent decay. This band bending and charge migrating module conferred the architecture with strong redox ability, sufficient exciton dissociation, and admirable optoelectronic characteristics. Moreover, the heterostructure acquired broad absorption spectrum to exhibit outperforming photocatalytic effect. Totally, this electron redistribution at the hierarchical interface, a type-II scheme charge-transfer pathway and the oxygen defects would lead to high efficiency in solar light assisted N 2 reduction. Typically, Co@Ni 3 Fe-2 catalyst exhibited the highest NH 3 production rate of 16.15 μg h −1 mg cat. −1 and Faraday efficiency (FE) of 31.57% at −0.6 V vs. RHE in 0.1 M Na 2 SO 4 solution. Fortunately, with light exposure, the NH 3 production rate and FE could increase by 27.9% and 18.1% than that under dark. This work would provide a plausible attitude towards the design of high efficient photocatalyst for artificial photosynthesis with multi-functionalized coupling effect.
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APPLIED CATALYSIS A-GENERAL
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2024
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IF 4.7
Sheng-Li Lv,Kuan Wang,Song-Song Li,Xin-Peng Li,Tong-Le Dang,Zhen-Hong He,Huan Wang,Weitao Wang,Yang Yang,Zhao-Tie Liu
Photothermal catalytic oxidation of cyclohexane was found to be an effective and green strategy for the production of cyclohexanol and cyclohexanone (KA oil). However, such strategy existed some obstacles, which hindered its application in the one-step synthesis of adipic acid (AA), necessitating further breakthroughs. Herein, a p-n heterojunction of Fe 8 Ce 2 O x /WO 3 was constructed by a simple combination of solvothermal and impregnation methods, enabling the one-step synthesis of AA via the photothermal cyclohexane oxidation under solvent-free and visible light conditions. Remarkably, the Fe 8 Ce 2 O x /WO 3 nanocomposites exhibited outstanding catalytic performance, achieving a conversion of cyclohexane reached 9.67% with the 92.45% selectivity towards AA (solid, 59.46%) and KA oil (liquid, 32.99%). The Fe 8 Ce 2 O x /WO 3 composites also demonstrated exceptional stability in the production of AA, further highlighting its potential as a catalyst for industrial applications. The exceptional catalytic properties of Fe 8 Ce 2 O x /WO 3 composites can be attributed to the promoted electronic excitation capability, enhanced separation and migration of electron-hole, suppressed charge complexation, broaden visible-light absorption, and effective photo-thermal co-catalytic effects. Furthermore, the Fe 8 Ce 2 O x /WO 3 composites possess a strong adsorption capacity for oxygen and suitable specific surface area, which can be effectively facilitate the interaction between O 2 and cyclohexane, enabling the full utilization of oxygen in the oxidation of cyclohexane to form AA. The proposed approach offers a novel methodology for the design and fabrication of photothermal catalysts to achieve the direct synthesis of AA via the cyclohexane oxidation under solvent-free and visible light conditions in industry.
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Journal of Environmental Chemical Engineering
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2024
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IF 7.4
Liping Zhang,Hexia Yuan,Yiyun An,Huitong Li,Yiqing Gao,Huaran Sun
Coking reverse osmosis concentrated water contains refractory organic pollutants . If not treated, it will generate hazardous solid waste that cannot be utilized in the subsequent evaporation and crystallization process . In order to effectively remove organic substances from coking reverse osmosis concentrated water, Ti/PbO 2 electrode, Ti/Ce,Nd-PbO 2 electrode, and Ti/P(ANI-co-Py)/Ce,Nd-PbO 2 electrode were prepared. The electrodes were characterized by scanning electron microscopy, X-ray diffraction spectroscopy, and X-ray photoelectron spectroscopy, revealing that the average crystal grain size of lead dioxide on the surface of the Ti/P(ANI-co-Py)/Ce,Nd-PbO 2 electrode is 29.58 nm. The electrochemical performance of the electrodes was tested using cyclic voltammetry and electrochemical impedance spectroscopy , which showed oxidation peaks at 1.37 V, 1.81 V, and 2.1 V for the Ti/P(ANI-co-Py)/Ce,Nd-PbO 2 electrode, with a charge transfer resistance of 56.34 Ω. Accelerated life test indicated that the Ti/P(ANI-co-Py)/Ce,Nd-PbO 2 electrode has an accelerated lifespan of 1050 min. The effects of interelectrode distance, pH value, current density , and other factors on the electrocatalytic oxidation of 3,5-di-tert-butylphenol by the Ti/P(ANI-co-Py)/Ce,Nd-PbO 2 electrode were investigated, achieving a removal efficiency of 98.67 % under optimal conditions. Performance analysis of the Ti/P(ANI-co-Py)/Ce,Nd-PbO 2 electrode demonstrated good stability. Treatment of actual coking reverse osmosis concentrated water using the Ti/P(ANI-co-Py)/Ce,Nd-PbO 2 electrode resulted in removal efficiencies of 87.76 %, 47.92 %, and 77.42 % for COD , TOC, and UV 254 , respectively. The current efficiency and energy consumption of electrocatalytic degradation of coking reverse osmosis concentrated water were 9.38 % and 0.15 kWh/g COD. This study provides a better treatment solution for the degradation of organic matter in coking reverse osmosis concentrated water.
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APPLIED SURFACE SCIENCE
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2024
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IF 6.3
Xu Yu,Xinyu Wang,Pinyi He,Guohui Yang,Lijing Gao,Fu Qin,Yongkang Yao,Jianliang Bai,Lili Ren
The interfacial electron modulation of electrocatalysts is a useful technique for promoting catalyst performance for the water-related dissociation reactions. Herein, a high-efficient Fe-doped allotropic Co 2 P/CoP heterojunction nanoparticles embedded in N, P co-doped carbon matrix was constructed. The intense electrical interfacial contacts between the allotropic heterojunction optimized the reaction kinetics by boosting efficient charged active centers, regulating the intermediate adsorption/desorption. The incorporation of Fe atoms further enhancing the heterointerface contact between CoP and Co 2 P by providing favorable electronic properties and special coordination environment, causing the interfacial coupling enhancement. Therefore, Fe-Co 2 P/CoP possesses outstanding performance in both hydrogen evolution reaction and oxygen evolution reaction, with small overpotentials of 174 mV and 286 mV at 10 mA·cm −2 in alkaline medium, respectively. And only 1.71 V battery voltage is needed for the Fe-Co 2 P/CoP (+, −) cell device with satisfactory durability. This finding provides valuable insights into the engineering of electronic structures of well-designed metal phosphides for water electrolysis.
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JOURNAL OF HAZARDOUS MATERIALS
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2024
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IF 12.2
Qicai Zhang,Xianli Wang,Chengbin Liu,Huaxi Li,Zhongsheng Deng,Chunxia Yao,Yameng Li,Qinxiong Rao,Weiguo Song
Given the high toxicity of N-(1,3-dimethylbutyl)-N′-phenyl- p -phenylenediamine (6PPD) derivatives, such as 6PPD quinone (6PPDQ) to salmon, as well as their ubiquitous presence in the environment, the contaminant of aquatic food products has drawn significant attention. However, analytical methods for p -Phenylenediamines (PPDs) and their transformation products (TPs) in aquatic products remain underdeveloped. In particular, the degradation of some compounds and strong matrix effects complicate detection. In this study, we present a stable, rapid, and sensitive method combining salt-out assisted extraction, antioxidant protection, and multi-plug filtration clean-up (m-PFC) to detect two PPDs and five TPs in aquatic products. Crucially, the appropriate selection of antioxidants prevented the degradation of the easily oxidized target compounds. Further, the m-PFC method significantly enhanced the purification efficiency, achieving satisfactory recoveries (62.1–115 %), and method detection limits (MDLs) ranging from 0.00300 to 0.400 μg/kg. Subsequently, the method was applied to monitor PPDs and their TPs in aquatic products systematically, revealing the presence of 6PPD and N-isopropyl-N′-phenyl-1,4-phenylenediamine (IPPD) in white shrimp from aquafarms, whereas none of the seven target analytes were detected in fish and crab samples. These findings contribute to the detection of PPDs, their TPs and other unstable chemicals in aquatic products, thereby providing insights into their concentrations in these products.
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PubMed
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Asia-Pacific Journal of Chemical Engineering
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2024
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IF 1.4
Dan-Dan Cui,Xue-Ru Liu,Long-Yue Meng,Ying-ai Piao,Biao Jin
Adrenaline (AD) is important in information transmission through the human central nervous system. Considering the significant biochemical functions of AD, the development of electrochemical sensors capable of detecting AD levels in living organisms has attracted considerable interest. In this study, AD was detected using electrochemical sensors developed based on Au nanoparticles/ionic liquids/N- and P-co-doped carbon nanotubes-modified carbon cloth (AuNPs/ILs/N,P-MWCNTs/CC) electrodes. AuNPs/ILs/N,P-MWCNTs/CC composites were prepared on carbon cloth (CC) substrates using ionic liquids (ILs), N- and P-co-doped multi-walled carbon nanotubes (N,P-MWCNTs), and Au nanoparticles (AuNPs) as modified materials. The effects of pH and scanning speed were optimized and tested on the prepared composites. The results of cyclic voltammetry (CV) and differential pulse voltammetry (DPV) experiments showed that the modified ILs, N,P-MWCNTs, and AuNPs effectively improved the oxidation performance of AD. In addition, the linear range obtained from the DPV scans of the AuNPs/ILs/N,P-MWCNTs/CC composite material was 30–505 μmol/L, with a detection limit of 0.31 μmol/L. The fabricated sensors have good sensitivity (6.9 μA·mM −1 ·cm −2 ) for AD of 30–505 μM. Therefore, the electrochemical sensing method based on the AuNPs/ILs/N,P-MWCNTs/CC composite material is a promising and reliable AD detection technology that also exhibits good selectivity in the presence of interfering substances such as folic acid and ibuprofen. In practical applications, this material can help realize real-time AD detection to determine whether athletes use doping and other illegal drugs before competitions and to perform synchronous detection.
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JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2012
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IF 1.693
Baimei Yang,Hui Wan,Guofeng Guan
Isobaric vapor–liquid equilibrium (VLE) data are reported for binary mixtures of methyl formate + o-xylene, methyl formate + m-xylene, methyl formate + p-xylene, and methyl formate + ethylbenzene at 101.33 kPa. The data are obtained using a vapor recirculating type (modified Othmer's) equilibrium still. All of the binary systems show positive deviation from ideality. None of the systems form an azeotrope. The VLE data for these binary systems are checked to meet rigorous thermodynamic consistency by the Herington method and the point-to-point test of the Fredenslund method. The experimental VLE data are well-correlated by the nonrandom two-liquid (NRTL), universal quasichemical activity coefficient (UNIQUAC), and Wilson equations.
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JOURNAL OF MICROBIOLOGY AND BIOTECHNOLOGY
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2024
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IF 2.5
Lu Huang,Ye Zhang,Jie Liu,Dalin Zhang,Li Li
This study presents a fluorescent mechanism for two-step amplification by combining two widely used techniques, exponential amplification reaction (EXPAR) and catalytic hairpin assembly (CHA). Pseudomonas aeruginosa ( P. aeruginosa ) engaged in competition with the complementary DNA in order to attach to the aptamer that had been fixed on the magnetic beads. The unbound complementary strand in the liquid above was utilized as a trigger sequence to initiate the protective-EXPAR (p-EXPAR) process, resulting in the generation of a substantial quantity of short single-stranded DNA (ssDNA). The amplified ssDNA can initiate the second CHA amplification process, resulting in the generation of many double-stranded DNA (dsDNA) products. The CHA reaction was initiated by the target/trigger DNA, resulting in the release of G-quadruplex sequences. These sequences have the ability to bond with the fluorescent amyloid dye thioflavin T (ThT), generating fluorescence signals. The method employed in this study demonstrated a detection limit of 16 CFU/ml and exhibited a strong linear correlation within the concentration range of 50 CFU/ml to 10 5 CFU/ml. This method of signal amplification has been effectively utilized to create a fluorescent sensing platform without the need for labels, enabling the detection of P. aeruginosa with high sensitivity.
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