DIAMOND AND RELATED MATERIALS
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2025
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IF 5.1
Jinjing Du,Yuehao Guo,JianGuo Zhang,Dongbo Wang,Tao Zhang,Yu Zhou,Yuxiang Yangxuan,Xun Liu,Bin Wang,Qian Li
In this paper, with the goal of developing a high-performance silicon-based negative electrode through a reasonable green design using simple magnesium thermal reduction and pickling combined methods. Specifically, we utilize inexpensive photovoltaic waste silicon mud as the silicon source to synthesize porous silicon. Subsequently, we utilized self-produced porous silicon as the raw material and graphene as the coating material to fabricate a graphene-coated porous silicon-based negative electrode material with excellent cycling stability. We employ the PW91 method, which is based on density functional theory (DFT) using the generalized gradient approximation (GGA), to compute the first principles of both silicon-based materials and graphene-coated silicon/graphene composites. The study revealed that the P-Si@RGO composite exhibited excellent electrochemical properties. When adding 150 mL of graphene oxide with a concentration of 0.2 mg/mL. Even after the 100th cycle at a current density of 100 mA·g −1 , the specific discharge capacity of the P-Si@RGO electrode remains high at 1167.6 mAh·g −1 . At the same time, the results of DFT calculations also show that graphene can improve the conductivity of silicon materials. In summary, the experimental results are consistent with the results of the first-principal calculation, indicating that the computer simulation can predict the accuracy of the experiment, verify the empirical conclusions, and indicate the direction for designing the experimental scheme.
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INDUSTRIAL CROPS AND PRODUCTS
·
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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LANGMUIR
·
2025
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IF 3.9
Xin Cao,Zhiyang Zhang,Jiadong Chen,Ji Qi,Yanzhou Wu,Zhenyu Liu,Yan Chen,Xiaobo Xie,Shuang Su,Chunlei Xia,Lingxin Chen,Xiaoyan Wang
Gold nanorods (AuNRs), as versatile sensing materials, have wide analytical applications due to their unique optical properties. Cetyltrimethylammonium bromide (C16TAB), a conventional reagent in AuNR synthesis, also often acts as a stabilizer of AuNRs in applications. However, C16TAB-stabilized AuNRs undergo severe spontaneous aggregation and etching under extreme pH conditions, greatly limiting their optical sensing applications. Herein, we accidentally discovered that octadecyl trimethylammonium bromide (C18TAB), a rarely used surfactant for AuNRs, has a substantially higher stabilizing ability than C16TAB in preventing spontaneous aggregation and etching of AuNRs, which enables C18TAB-stabilized AuNRs as a superior sensing platform, demonstrating a 100-fold higher sensitivity than C16TAB-stabilized AuNRs for detection of model analytes. The excellent stability of C18TAB-stabilized AuNRs can be attributed to the higher surfactant coverage density on the gold surface, evidenced by the red-shifted longitudinal band (5 nm), which is tuned by the metal surface refraction index. The experimental results show that C18TAB-stabilized AuNRs can keep monodispersed and unchanged optical properties at very acidic and alkaline conditions with a low concentration of surfactant (0.05 mM). Moreover, the C18TAB-stabilized AuNRs can prevent spontaneous etching in the acidic sensing system and maintain their unchanged plasmon band, therefore decreasing the intensity of the noise signal. Benefiting from these findings, we established a reliable and ultrasensitive C18TAB-stabilized AuNR sensing platform and achieved the ultrasensitive detection of the model biomarker p-aminophenol (pAP), with a visual detection limit of 8 nM. This sensitivity represents at least a 100-fold improvement over the existing method using C16TAB-stabilized AuNRs. Moreover, C18TAB-stabilized AuNRs were successfully applied to detect pAP in urine samples with satisfactory recovery rates of 99.84–114.91%, further validating its reliability in practical applications. In summary, C18TAB-stabilized AuNRs provide a powerful tool for trace-level visual detection in chemo- and biosensing.
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Journal of Water Process Engineering
·
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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Journal of Materials Chemistry C
·
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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Asian Journal of Pharmaceutical Sciences
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2024
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IF 10.7
Dawei Jiang,Chao Chen,Peng Dai,Caiyan Li,Zhiyi Feng,Na Dong,Fenzan Wu,Junpeng Xu,Ping Wu,Liuxi Chu,Shengcun Li,Xiaokun Li,Youjun Yang,Weian Zhang,Zhouguang Wang
The cyanine dyes represented by IR780 can achieve synergistic photodynamic therapy (PDT) and photothermal therapy (PTT) under the stimulation of near-infrared (NIR) light (commonly 808 nm). Unfortunately, the stability of NIR-excited cyanine dyes is not satisfactory. These cyanine dyes can be attacked by self-generated reactive oxygen species (ROS) during PDT processes, resulting in structural damage and rapid degradation, which is fatal for phototherapy. To address this issue, a novel non-cyanine dye (IR890) was elaborately designed and synthesized by our team. The maximum absorption wavelength of IR890 was located in the deep NIR region ( ca. 890 nm), which was beneficial for further improving tissue penetration depth. Importantly, IR890 exhibited good stability when continuously illuminated by deep NIR light. To improve the hydrophilicity and biocompatibility, the hydrophobic IR890 dye was grafted onto the side chain of hydrophilic polymer (POEGMA-b-PGMA-g-C CH) via click chemistry. Then, the synthesized POEGMA- b -PGMA- g -IR890 amphiphilic polymer was utilized to prepare P-IR890 nano-photosensitizer via self-assembly method. Under irradiation with deep NIR light (850 nm, 0.5 W/cm 2 , 10 min), the dye degradation rate of P-IR890 was less than 5%. However, IR780 was almost completely degraded with the same light output power density and irradiation duration. In addition, P-IR890 could stably generate a large number of ROS and heat at the same time. It was rarely reported that the stable synergistic combination therapy of PDT and PTT could be efficiently performed by a single photosensitizer via irradiation with deep NIR light. P-IR890 exhibited favorable anti-tumor outcomes through apoptosis pathway. Therefore, the P-IR890 could provide a new insight into the design of photosensitizers and new opportunities for synergistic combination therapy of PDT and PTT.
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 5
·1-13
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IF 5.3
Hu Anqi,Chen Guoqing,Li Lei,Ma Chaoqun,Yang Taiqun,Gao Hui,Gu Jiao,Zhu Chun,Wu Yamin
Nitrogen, boron co-doped carbon quantum dots (gCQDs), and a coloration probe (PPD-NPs) with response to cobalt ions (Co 2+ ) were prepared by using 4-hydroxyphenylboric acid as the common precursor, with ethylenediamine and p-phenylenediamine (PPD) adopted as nitrogen-doped reagents, respectively. A noticeable brown-to-purple color change can be observed with the addition of Co 2+ , and a broad absorption band emerges at 535 nm. At the same time, gCQDs, which is introduced as the fluorescence signal source, will be significantly quenched due to the enhanced inner filtration effect, induced by the overlap between the emission spectrum of gCQDs and the emerging absorption band. Therefore, a colorimetric/fluorescent dual-mode sensing probe for Co 2+ is constructed by combining the recognition unit PPD-NPs and the fluorescent gCQDs into PPD-NP/gCQD. Under the optimized experimental conditions, the calculated limits of detection are 1.51 × 10 −7 M and 3.75 × 10 −7 M for the colorimetric mode and the fluorescence mode, respectively, well qualified for the determination of Co 2+ maximum permitted level in drinking water. The feasibility of the proposed method has been verified in tap water, lake water, and black tea samples. Graphical Abstract
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JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
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2025
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IF 3.1
Gu Weiwen,Bing Linhan,Jin Gaoling,Sun Qianhe,Fan Yu,Liu Botong,Huang Hanjiang,Wei Jianfei,Wang Rui
As the most widely utilized thermoplastic polyester with the largest production volume, PET is primarily used in clothing, curtains, plastic films, and electronic appliances, all of which have high safety performance requirements, particularly in terms of fire resistance. In this study, a bio-based integrated phosphorus-containing flame retardant (PCDs) was efficiently prepared using phosphoric acid and biomass material gelatin as raw materials, employing a rapid microwave-assisted method. Subsequently, PCDs was copolymerized into the PET matrix (PET-PCDs) through in situ polymerization, achieving enhanced flame retardancy. The combustion properties and flame retardancy mechanisms were analyzed using CONE, TG-IR, and py-GCMS. The results showed that the peak heat release rate of PET-PCDs decreased by 54.02% when the PCDs content was only 1.0 mass%. Additionally, the yield of CO and CO 2 decreased by 9.00% and 16.67%, respectively. In terms of fire risk, compared to PET, the fire growth index of PET-PCDs decreased by 64.07%, and the fire performance index increased by 51.61%. Furthermore, the tensile strength of PET-PCDs was not significantly affected, and the elongation was improved. This study offers a promising solution for the development of eco-friendly and integrated flame retardants for PET.
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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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Asia-Pacific Journal of Chemical Engineering
·
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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MEASUREMENT
·
2024
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IF 5.2
Bin Yin,Zhuxuan Jiang,Shilin Liu,Guofeng Sang,Yanzhi Lv,Muguang Wang,Shiying Xiao,Beilei Wu,Qichao Wang,Li Pei,Songhua Wu
A composite Fabry-Perot (F-P) fiber optic sensor based on the vernier effect is fabricated, and experiments confirmed that it can be used to simultaneously measure underwater temperature and pH. The fiber optic sensor fabricated with single mode fiber (SMF) − multi mode fiber (MMF) − seven core fiber (SCF) − quartz capillary tube (QCT) − no core fiber (NCF) structures has contained a silane coupling agent-polyvinyl alcohol/graphene oxide (SCA-PVA/GO) hybrid multilayer film to enhance the sensor performance. Two types of sensors are fabricated, one with a plane end face and another with a tapered end surface, which named as sensor 1 and sensor 2, respectively. Their performance are experimentally demonstrated. Within the temperature range of 15°C-35°C and the pH range of 7.55–9.21, the sensitivities of sensor 1 to temperature and pH are 82.94 pm/°C and 1.16 dB/pH, while the corresponding values of sensor 2 are 39.26 pm/°C and 0.4 dB/pH. Experimental results demonstrated that the sensitivities of sensor 1 to temperature and pH are higher than that of sensor 2. But compared with sensor 2, sensor 1 has higher values of crosstalk and random error. By contrast, sensor 2 maintain a good linear relationship with the environmental dual parameters, allowing for the simultaneous measurement of underwater temperature and pH. Moreover, both sensors demonstrate good stability and reversibility when the temperature and pH are varied. Furthermore, the pH response times of the two sensors are less than 0.5 s, with a recovery time of 2 s. Thus, the proposed sensors with outstanding stability, reversibility, repeatability, and rapid response times will have a broad range of applications in the fields of marine environment monitoring, water quality detection, and food and medical device safety testing.
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JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2025
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IF 4.6
Jian Xiao,A.-Lin Xia,Tao Geng
In order to accurately quantify the content of light elements in food samples, a method based on portable energy dispersive X-ray fluorescence (p-XRF) technology combined with second-order calibration algorithm was proposed to simultaneously quantify phosphorus (P), sulfur (S), potassium (K) and calcium (Ca) in different food samples. Firstly, the XRF response signal matrix of each food sample was obtained by changing the test current and voltage. Secondly, the alternating penalty trilinear decomposition (APTLD) algorithm was used to analyze the three-way data array stacked by multiple samples. The results showed that second-order calibration algorithm could accurately extract the spectral signal of the target element even if there were serious background interference and signal overlap. The predicted recovery rates of the target elements in the food samples are 82 %–119 %. The LOD and LOQ of P, S, K, and Ca are 3, 3, 20, 8 ppm and 9, 11, 68, 26 ppm, which proves that this method can accurately quantify light elements in food samples. This study demonstrated that p-XRF combined with second-order calibration is an effective method for the determination of light elements in food and has broad practical application prospects.
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