MICROCHIMICA ACTA
·
2019
·Vol. 186
·期 12
·1-8
·
IF 5.479
Yi Xiaotong,Liu Chang,Liu Xueke,Wang Peng,Zhou Zhiqiang,Liu Donghui
Magnetic partially carbonized cellulose nanocrystals (MPC-CNC) were obtained by sulfuric acid treatment of microcrystalline cellulose (MCC) and then loaded with magnetic Fe 3 O 4 nanoparticles. The material is shown to be a viable material for magnetic solid phase extraction of triazine and triazole pesticides from water. The pesticides (specifically: simazine, ametryn, prometryn, terbutryn, atrazine, triadimenol, epoxiconazole, myclobutanil, triadimefon and tebuconazole) were quantified by ultra HPLC in tandem with a triple quadrupole mass spectrometry (UHPLC-MS/MS). The effects of NaCl concentration, amount of adsorbent, vortex time, sample volume and pH value on extraction efficiency were optimized by Plackett-Burman design and Box-Behnken design methods. Under the optimal conditions, the method shows the following figures of merit: (a) Linear responses in the range from 0.02–10 μg L −1 ; (b) detection limits between 2.2 to 6.1 ng L −1 (for S/ N = 3); (c) recoveries from spiked samples of 73.7–117.1% with relative standard deviations (RSDs) of 2.0–15.7%; and (d) an enrichment factor of 75. The method was successfully applied to the determination of the pesticides in five environmental water samples.
Schematic representation of the process of magnetic solid phase extracting pesticides in water using MPC-CNC. MCC-microcrystalline cellulose; PC-CNC- partially carbonized cellulose nanocrystals; MPC-CNC-magnetic partially carbonized cellulose nanocrystals.
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JOURNAL OF MEMBRANE SCIENCE
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2022
·
IF 10.53
Qing Fang,Qin Liu,Zongli Xie,Matthew R. Hill,Kaisong Zhang
Solvent resistant nanofiltration membranes with both improved permeability and long-term stability are in desperate demand for organic solvent recovery. In this study, a high-performance molybdenum sulfide (MoS 2 )-poly-trimethylsilylpropyne (PTMSP) nanocomposite membrane was prepared on polysulfone (PSf) through a facile solution casting method, which was used for efficient organic solvent recovery. Two-dimensional (2D) MoS 2 was employed to construct interlayer channels that facilitated the passage of solvents and blocked small molecule solutes. Compared with the pristine PTMSP membrane, the methanol permeance of modified membrane increased by 47% (5.89 L m −2 h −1 bar −1 ) while remaining the retention rate of RB of 97.14%. The obtained membrane exhibited superior mechanical strength as well as excellent stability. Moreover, the resultant membrane also showed more precise molecular sieving capability than most reported polymer membranes. This work demonstrated that incorporating 2D MoS 2 nanosheets into PTMSP polymer is a promising method to obtain organic solvent nanofiltration (OSN) membranes with excellent separation performance and favorable long-term stability.
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Analytical Methods
·
2022
·Vol. 14
·期 42
·4245-4251
·
IF 3.532
Hong Zhai,Mengmeng Gao,Yunfeng Bai,Jun Qin,Qing Song,Zhixiong Liu,Haiyan Wang,Feng Feng
Two kinds of copper-based metal fluorescent nanoclusters were successfully prepared by the chemical reduction method; one of them (CuNCs) was synthesized by direct reduction of copper sulfate, and the other (CuAuNCs) was synthesized by the stepwise addition of copper salt and chloroauric acid. CuNCs were used to establish the fluorescence resonance energy transfer (FRET) system with neutral red (NR) due to the supramolecular effect of β-cyclodextrin (β-CD) modified on the surface of CuNCs. NR could enter the hydrophobic cavity of β-CD and narrow the distance between CuNCs and NR, which could lead to FRET. Fluorescence was transferred from CuNCs to NR, resulting in amplification of the NR fluorescence signal, which could be used to detect vanillin. In addition, CuAuNCs with strong fluorescence were used as fluorescent probes to detect vanillin through the quenching mechanism. By comparison, the simplicity of CuNC synthesis and the high selectivity of β-CD made the FRET method more practical, which may provide a new strategy for assaying vanillin.
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JOURNAL OF FLUORESCENCE
·
2023
·
IF 2.7
Liu Fang,Zhu Changjian,Wang Yingte,Zhang Yong
Carbon dots have been widely focused on the field of sensing and detection due to their excellent optical property. Herein, novel orange fluorescent nitrogen and chlorine co-doped carbon dots (N,Cl-CDs) are obtained by one-pot hydrothermal method using o-phenylenediamine and neutral red. Based on the inner filter effect, the prepared N,Cl-CDs can be innovatively developed as an effective “signal-off” multifunctional sensing platform for sensitive determination of tetracycline. The proposed sensor was utilized to realize the determination of tetracycline in Rirver water samples/milk samples (λex = 390 nm, λem = 606 nm) with satisfactory recoveries and relative standard deviations. The linear range of are 0.05 to 45 μM and 45 to135 μM, and detection limit is 3.9 nM (3σ/m). Meanwhile, the luminescent intensity of N,Cl-CDs was reduced gradually when pH changed continuously from 12 to 2, showing a pH-responsive fluorescence property with two linear ranges of pH 3–7 and pH 7–10. In addition, due to the characteristics of low toxicity and excellent biocompatibility, the N, Cl-CDs were also used in the imaging of oocystis cells, which is hopeful to realize the detection of tetracycline in living cells.
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Journal of Cleaner Production
·
2023
·
IF 11.1
Simin Wang,Min Liu,Wuxia Ge,Can Jin,Wentao Bi
In this study, the efficient extraction of lignin from wood meal using a deep eutectic system (DESys) was explored, and the obtained lignin was characterized. The impact of various factors, such as the type of DESys components, extraction time, temperature, water content, and solid-liquid ratio, on the lignin extraction process was systematically investigated. The results indicated that a DESys with a carboxylic acid as the HBD provided the highest lignin extraction efficiency. The obtained lignin was characterized in terms of its molecular weight distribution, elemental composition , functional groups, crystalline structure, and thermal stability. The results showed that the lignin obtained by DESys-based extraction had similar properties to lignin extracted using traditional method. Additionally, the study examined the utilization of the residue left after lignin extraction for the adsorption of cationic pollutants, such as the cationic dye neutral red (NR). The residue was found to contain carboxyl groups , which enabled it to adsorb NR efficiently. The kinetic and thermodynamic models suggested that the adsorption was a chemisorption process. Furthermore, the residue showed selective adsorption for cationic dye over anionic dye. This selectivity was attributed to interactions between the residue's functional groups and the cationic dye molecule. Overall, this study provided a sustainable and comprehensive approach to lignin extraction from lignocellulosic biomass using DESys. It also demonstrated the potential of using the residue from the extraction process for the removal of cationic pollutants from wastewater, showcasing a multi-faceted approach to the valorization of lignocellulosic materials .
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ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2023
·
IF 11.4
Abdul Ghaffar,Muhammad Hassan,Oleksiy V. Penkov,Cafer T. Yavuz,Kemal Celebi
Molecular separations involving solvents and organic impurities represent great challenges for environmental and water-intensive industries. Novel materials with intrinsic nanoscale pores offer a great choice for improvement in terms of energy efficiency and capital costs. Particularly, in applications where gradient and ordered separation of organic contaminants remain elusive, smart materials with switchable pores can offer efficient solutions. Here, we report a hierarchically networked porous organic cage membrane with dynamic control over pores, elucidating stable solvent permeance and tunable dye rejection over different molecular weights. The engineered cage membrane can spontaneously modulate its geometry and pore size from water to methanol and DMF in a reversible manner. The cage membrane exhibits ≥585.59 g mol–1 molecular weight cutoff preferentially in water and is impeded by methanol (799.8 g mol–1) and DMF (≈1017 g mol–1), reflecting 36 and 73% change in rejection due to self-regulation and the flexible network, respectively. Grazing incidence X-ray diffraction illustrates a clear peak downshift, suggesting an intrinsic structural change when the cage membranes were immersed in methanol or DMF. We have observed reversible structural changes that can also be tuned by preparing a methanol/DMF mixture and adjusting their ratio, thereby enabling gradient molecular filtration. We anticipate that such cage membranes with dynamic selectivity could be promising particularly for industrial separations and wastewater treatment.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
·
IF 5.2
Dongxue Han,Guohua Li,Jie Wang,Teng Zheng,Liang Peng,Lin Li,Tifeng Jiao
Self-assembly is a technique that utilizes non-covalent interactions between molecules to assemble into ordered nano-scale aggregates from disordered states. Langmuir-Blodgett (LB) technique is one of the commonly applied methods for constructing molecular assemblies at gas-liquid interfaces. In this study, a series of ordered composite films of amino-functionalized carbon nanotubes (MWCNTs-NH 2 ) and different dye molecules were prepared using LB technique. The surface-enhanced Raman scattering (SERS) performance of MWCNTs-NH 2 /dye composite films was investigated. The experimental results showed that MWCNTs-NH 2 /Methylene blue (MB) composite film exhibited good SERS enhancement performance for Rhodamine 6 G (R6G) molecules with an enhanced factor (EF) of 2.16 × 10 5 , and had certain repeatability and uniformity, making it suitable for the detection of trace molecule. The photoelectric conversion efficiency of MWCNTs-NH 2 /dye composite films were also explored. MWCNTs-NH 2 /MB composite film not only exhibited the highest photocurrent value but also had the smallest impedance compared with the other films, indicating that it had lower impedance, better carrier transport rate, and more stable performance. This work provides an effective method for fabricating the composite LB films based on the carbon nanotubes with great SERS and photoelectric conversion efficiency.
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AQUATIC TOXICOLOGY
·
2023
·
IF 4.5
Xin Li,Weiwei Wang,Xuedong Wang,Huili Wang
Herein, we demonstrated that sublethal-dose exposure to triclosan (TCS) and triclocarban (TCC) triggered larval zebrafish immunotoxicity. Acute exposure to TCS induced significant increases in larval neutrophils and macrophages and a prominent decrease in thymic T cells. In contrast, three kinds of cells (neutrophils, macrophages, and thymic T cells) were significantly reduced under TCC exposure, suggesting that both TCS and TCC suppress thymus development and mature T-cell differentiation. TCC was confirmed to have more severe immunotoxicity than TCS. Using Illumina RNA-Seq, 581 and 738 differentially expressed genes (DEGs) were identified in the TCS and TCC treatments, respectively. GO function and KEGG pathway enrichment analyses revealed that the DEGs were not identical in terms of biological processes, cellular components and molecular functions, but were primarily involved in immune response. KEGG analysis showed that approximately 47% and 11% of DEGs were mainly enriched in the immune system of the TCC and TCS treatments, respectively. Protein-protein interaction (PPI) network analysis confirmed that the hub genes enriched in the immune-related pathways differed between TCS and TCC exposure. The hub genes were fynb, mapk12b, scarb1, pik3r2, prkg3, srfa, arhgef2, cldn15la , and cldn15lb in the TCS treatment, and plg, serping1, masp2, fgg, vtnb, mmp9, serpine1, il1b, sb:cb37 and stat3 in the TCC treatment. Molecular docking simulation demonstrated that both TCS and TCC were stably docked with their target hub genes, and that their target molecules for inducing immunotoxicity were different. The differential target molecules and action pathways induced by TCS and TCC exposure provide us with diagnostic targets and toxicological endpoints.
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JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 28
·11486-11499
·
IF 4.5
Jiang Yanxiao,Song Wei,Zhang Meng,Feng Yu,Liu Boyan,Zhang Hong,Kan Guangfeng,Yu Kai,Jiang Jie
In this study, metal–organic framework (MOF)-functionalized sponge columns were prepared using a simple approach by embedding melamine sponge in a homogeneous MOF solution and first applied in the removal of methyl orange dye from water samples. Various MOF materials (MIL-101(Cr), MIL-101(Fe), ZIF-8(Zn), HKUST-1(Cu), and MIL-68(Al)) with different structures were synthesized and used as coating materials for a blank sponge. This method not only can be used for a wide variety of MOF materials, but also can retain their unique properties. The results show that the sponge as an adsorbed base material can effectively simplify the separation procedures of adsorption. Under the optimal conditions, the prepared MOF/PVDF-sponge column had an excellent adsorption capacity (229.4 mg g −1 ) toward methyl orange and reached the equilibrium within 1 h. With simple one-step infiltration, excellent adsorption properties and simple operation, the MOF/PVDF-sponge column presents a promising commercial value. Moreover, this study provides a new approach for exploring functional porous sponges for adsorption of dyes from environmental water samples.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yaoxuan Li,Lihang Yan,Guanhua Liu,Huaxun Chen,Hao Zhao,Lihui Wang,Jing Gao,Yunting Liu,Xiaobing Zheng,Yanjun Jiang
Carbon capture, utilization and storage have become a hot topic in recent years, and enzymatic CO 2 reduction benefits from high selectivity, high efficiency and mild conditions making it promising. However, the low solubility of CO 2 , poor stability of free enzyme and high cost of coenzyme limit the application. Therefore, mesoporous silica nanoflower (SNF) was used to immobilize formate dehydrogenase (FDH) by electrostatic adsorption followed by the coating of a multifunctional zeolitic imidazolate framework (ZIF-8) layer by sequential coating of Zn 2+ and 2-methylimidazole (2-MeIm), thus obtaining a novel integrated nanocatalyst ZIF-8@FDH@SNF. Regulated by controlling the ratio of ligands, the ZIF-8 coating layer not only protected the enzyme and prevented leakage, but also increased the local CO 2 concentration using the imidazole group of ZIF-8 which improved the CO 2 adsorption by 34.5% compared with SNF. And the expensive NADH was regenerated by the coupled electrocatalysis. The optimized integrated nanocatalyst showed excellent stability and reusability. Highly efficient electroenzymatic CO 2 reduction was achieved with 1.38 mM formate yield after 3 h, 48.4% higher than that without ZIF-8 layer.
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BIOCHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 3.9
Jufen Yan,Pei Wang,Longxin Wang,Qi Jin,Abdallah S. Ali,Yongsheng He,Ying Wang,Yuxuan Sun,Aoqiang Li,Waly Adwy,Rasha H. Ahmed,Xinya Han
Synthetic dyes from textile, paper, leather, and plastic processing, etc. are the majority of the colored effluents and have a harmful impact on human health and environment. Dye biosorption through endophytic fungi will be a challenge. A new fungus isolated from blueberry pulp was identified morphologically and genetically as Penicillium janthinellum LM5. It was utilized for the biosorption of synthetic dyes by forming mycelium particles with efficient decolorization properties in the dye solution. The results of decolorization experiments exhibited that dye type, pH, temperature and time were the important factors and the best decolorization condition on Congo red was pH 6.0, 30 ℃ and 48 h. Moreover, LM5 can achieve 90% decolorization rate even under the high salt concentrations of 200 mg/mL. Based on spectral analysis , the decolorization of Congo red was mainly attributed to the biosorption of mycelium and its pellet structure. Additionally, the fungus adsorbed Congo red can be as an excellent electrode material with a long-cycle performance and stable capacitance property, being a good way for recycling. In summary, this research employed a novel dye treatment method with simultaneous culture and decolorization through an endophytic fungus LM5, being a promising biomaterial in the application of dye wastewater treatment .
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WATER AIR AND SOIL POLLUTION
·
2023
·Vol. 234
·期 3
·1-12
·
IF 2.9
Li Xiaran,Zhu Haishan,Zhang Yuke,Meng Ruiqi,Xiong Zhong,Xia Yanzhi
The discharge of dye wastewater and waste-oil has brought serious harm to the ecological environment and human health. Unfortunately, bifunctional adsorbents towards aqueous dyes in water- and oil-soluble dyes in organic media are still rare to date. In this research, magnetic ferric alginate carbon aerogel (FeACA) was prepared from sodium alginate by wet spinning, Fe 3+ -ion cross-linking, and pyrolysis in N 2 atmosphere. FeACA obtained a specific surface area of 215.3 m 2 g −1 with a mean pore size of 3.1 nm and exhibited near superparamagnetic character. The adsorption capacities of FeACA for methylene blue, Congo red, and oil red O were 123.7, 141.1, and 65.7 mg g −1 , respectively. FeACA revealed a good broad-spectrum adsorption performance for other eleven various types of dyes. This study demonstrates a fast adsorption strategy by combining the magnetic separation and ethanol desorption. Utilizing the strategy, the adsorption time of MB was reduced from 12 h to 205 min with half dosage of adsorbent. This research provides new insights for achieving multifunctional dye adsorption.
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