CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Songxue Wang,Jiayu Tian,Zhihui Wang,Qiao Wang,Jialin Jia,Xiujuan Hao,Shanshan Gao,Fuyi Cui
A novel CuO modified ceramic hollow fiber membrane for in-situ peroxymonosulfate (PMS) activation was developed and employed in surface water treatment. The performance of membrane fouling control and organic pollutants removal was systematically investigated. The results indicated that compared with pristine membrane, CuO modified ceramic hollow fiber membrane significantly improved the removal of dissolved organic carbon (DOC) and UV absorbance at 254 nm (UV 254 ) in surface water. The removal rate increased with the increase of CuO loading content because of the reduction of the membrane surface pore size, but declined with the increase of PMS dosage due to the degradation products of incomplete mineralization passing through the membrane. The fluorescent compounds in surface water were efficiently removed by the CuO modified ceramic hollow fiber membrane and enhanced with the increase of PMS dosage and CuO loading content. The CuO modified ceramic hollow fiber membrane with in-situ PMS activation exhibits excellent antifouling property to natural organic matter (NOM) in surface water. Both the reversible and irreversible fouling decreased with the increase of PMS dosage while the membrane fouling would be slightly intensified with increased loading of CuO on the membrane, suggesting the trade-off relation between PMS dosage and CuO loading content. In addition, the degradation efficiency of organic pollutants in surface water was dramatically enhanced by the CuO modified ceramic hollow fiber membrane via incorporation of in-situ PMS oxidation process. High removal performance after five cycles of experiments showed the superior stability and reusability of the CuO modified ceramic hollow fiber membrane.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2020
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IF 5.162
Yue Shi,Xiao Wang,Ning Wang,Fei-Fei Li,Yu-Lin You,Shu-Qi Wang
Glioblastoma (GBM) is the most malignant central nervous system tumor, with poor prognosis. Temozolomide (TMZ) has been used as a first–line drug for the treatment of GBM for over a decade, but its treatment benefits are limited by acquired resistance. Polysaccharides from Cibotium barometz (CBPs) are polysaccharides purified from the root of Cibotium barometz (L.) J . Sm., possessing sensitizing activity. The purpose of this study was to investigate the anti–cancer effect of CBP from different processing methods on U87 cells using a 1 H NMR–based metabolic approach, complemented with qRT–PCR and flow cytometry, to identify potential markers and discover the targets to explore the underlying mechanism. Cibotium barometz is usually processed under sand heating in clinical applications. Polysaccharides from both the processed (PCBP) and raw (RCBP) C. barometz were prepared, and the effect on enhancing the sensitivity to TMZ was investigated in vitro. CBP can significantly increase the toxicity of TMZ to the U87 cell line, promote apoptosis, enhance cell cycle changes, and arrest cells in S phase, and RCBP demonstrated better activity. Multivariate statistical analyses, such as principal component analysis (PCA) and orthogonal projection to latent structure with discriminant analysis (OPLS–DA), were used to identify metabolic biomarkers, and 12 metabolites in the cell extract samples were clearly identified as altered after RCBP exposure. NMR–based cell metabolomics provided a holistic method for the identification of CBP's apoptosis–enhancing mechanisms and the exploration of its potential applications in preclinical and clinical studies.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Chao Yu,Jian Lu,Jingwen Dai,Zeqing Dong,Xinyu Lin,Wendong Xing,Yilin Wu,Zhongfei Ma
Lithium ion (Li + ) is one of the important sustainable resource and it's urgently demanded to develop high-selectivity and high-efficient method to extract of Li + from seawater . Hence, we propose the ester-functionalized ion-imprinted membrane (IIMs) with high selectivity and stability for the rebinding and separation of Li + in aqueous medium via ion imprinted technology and membrane separation technology . In this work, the hydrophilic polydimethylsiloxane membranes (PDMS) are synthesized by self-polymerization of dopamine (DA) in aqueous solution, resulting in the fabrication of dense poly-dopamine (PDA) layer on the surface of PDMS (PDMS-PDA). In view of weak bonding forces (such as hydrogen bond , ionic bond and Van der Waals' force) between traditional imprinted polymer and ligand, the ester groups are formed between modified PDMS-PDA and ligand by surface grafting. The obtained Li + imprinted membranes (Li-IIMs) have a suitable cavity and high adsorption capacity toward Li + which reveal a high rebinding capacity (50.872 mg g −1 ) toward Li + based on ample rebinding sites and strong affinity force. The superior relative selectivity coefficients (α Na/Li , α K/Li and α Rb/Li are 1.71, 4.56 and 3.80, respectively) can be also achieved. The selectivity factors of Li-IIMs for Na + , K + and Rb + are estimated to be 2.52, 2.8 and 3.03 times larger than Li + non-imprinted membranes (Li-NIMs), which imply the superior selectivity of Li-IIMs toward Li + . The regeneration ability of Li-IIMs is observed by systematic batch experiments. In summary, it can be concluded that the rebinding capacities of Li-IIMs is slightly decrease after eluting process, owing to the Li-IIMs with outstanding stability performance. Presentation of the method pave a fine prospect for coming true the long-term use of imprinted membrane.
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EUROPEAN POLYMER JOURNAL
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2020
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IF 3.862
Rui Xu,Bolong Li,Jiale Ding,Wei Li,Yunhe Zhang
Photoinduced electron transfer/energy transfer (PET/ET) plays a very important role in improving the nonlinear optical (NLO) response. AlPc-Aqn and HAlPc-Aqn with donor-acceptor (D-A) structure were prepared by grafting aluminum phthalocyanine (AlPc) and hyperbranched aluminum phthalocyanine (HAlPc) through anthraquinone axial covalent bonding. After the axial covalent connection, the formed D-A phthalocyanine materials enhance the PET/ET process between the phthalocyanine ring and the anthraquinone structure, which results in significant fluorescence quenching and effectively improves the material's NLO properties. The discrepancy of LUMO levels (ΔE) further confirms that both AlPc-Aqn and HAlPc-Aqn formed a D-A system. This effectively promotes the electron transfer between the anthraquinone and the phthalocyanine ring, performing enhanced NLO response. Furthermore, compared to AlPc-Aqn, the special three-dimensional structure of HAlPc-Aqn brings a more efficient PET/ET process and exhibits a larger nonlinear absorption coefficient.
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RSC Advances
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2020
·Vol. 10
·期 30
·17906-17913
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IF 3.119
Xiaodong Lv,Peng Gao
Based on the optical quenching phenomenon, a smart mesoporous phosphorescent microsensor was built. It is a phenol microsensor, which inherits a high selectivity of molecularly imprinted polymers (MIPs) and room-temperature phosphorescence (RTP) properties of Mn-doped ZnS quantum dots (QDs). On the surface of silane-modified Mn-doped ZnS QDs, the phenol microsensor was synthesized by a sol–gel process. Because of the presence of a porogenic agent, a mesoporous structure played an important role in increasing the detection sensitivity. The MPTS-modified Mn-doped ZnS QDs were used as solid supports and auxiliary monomers. Under optimal conditions, the experiment for the detection of phenol had a linear range of 5.0 to 50 μmol L−1 with a correlation coefficient of 0.9983 and a high imprinting factor (IF) of 3.28. In addition, the as-prepared Mn-doped ZnS QD@ms-MIPs were successfully applied for phenol determination and selectivity in water samples. Therefore, this study provides a highly selective and sensitive mesoporous phosphorescent microsensor for the detection of phenol.
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JOURNAL OF MOLECULAR LIQUIDS
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2020
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IF 5.065
Jiangping Cao,Qilong Xie,Hongwei Di,Yongfeng Liang,Gui Ma,Zonghui Yi,Ping Zhang,Peng Fu,Jikai Li
A method for the simultaneous determination of eight phenolic compounds (PCs) with a wide polarity range in water samples has been developed and validated using molecular complex based dispersive liquid–liquid microextraction (MC-DLLME) followed by high-performance liquid chromatography. In this process, the molecular complex acted as the extractant, which was formed by tributyl phosphate (TBP) and 1-octanol through hydrogen bond interaction in situ, using a disposable polyethylene pipette for the extraction. The extraction mechanism was investigated by attenuated total reflection Fourier transform infrared spectroscopy (ATR-FTIR), which demonstrated that a TBP-1-octanol complex formed via P O HO hydrogen bonding . Furthermore, the extraction mechanism in the dual extraction solvent system involves hydrogen bonding for polar PCs and physical extraction for weak polar and apolar ones. Under the optimum conditions, detection limits were in the range 0.4–5.51 ng/mL and recoveries for the real samples varied from 82.0% to 104.7%, with a relative standard deviation (RSD) of <9.1%. The developed method is simple, inexpensive and sensitive and was successfully applied to the extraction and determination of phenolic compounds in water samples.
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Catalysts
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2020
·Vol. 10
·期 4
·402
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IF 3.52
Depeng Han,Wang Yin,Ali Arslan,Tongrui Liu,Yan Zheng,Shuqian Xia
Repolymerization is a huge problem in the storage and processing of biomass pyrolysis liquid (PL). Herein, to solve the problem of repolymerization, mild catalytic hydrotreatment of PL was conducted to convert unstable PL model compounds (hydroxyacetone, furfural, and phenol) into stable alcohols. An Ni/SiO2catalyst was synthesized by the deposition-precipitation method and used in a mild hydrotreatment process. The mild hydrotreatment of the single model compound was studied to determine the reaction pathways, which provided guidance for improving the selectivity of stable intermediate alcohols through the control of reaction conditions. More importantly, the mild hydrotreatment of mixed model compounds was evaluated to simulate the PL more factually. In addition, the effect of the interaction between hydroxyacetone, furfural, and phenol during the catalytic hydrotreatment was also explored. There was a strange phenomenon observed in that phenol was not converted in the initial stage of the hydrotreatment of mixed model compounds. Thermogravimetric analysis (TGA), Ultraviolet-Raman (UV-Raman), and Brunauer−Emmett−Teller (BET) characterization of catalysts used in the hydrotreatment of single and mixed model compounds demonstrated that this phenomenon did not mainly arise from the irreversible deactivation of catalysts caused by carbon deposition, but the competitive adsorption among hydroxyacetone, furfural, and phenol during the mild hydrotreatment of mixed model compounds.Keywords:repolymerization;biomass pyrolysis liquid;mild catalytic hydrotreatment;mixed model compounds;competitive adsorption
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SCIENCE OF THE TOTAL ENVIRONMENT
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2020
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IF 6.551
Xiaoyan Zhang,Yunning Chen,Qingkun Shang,Yingna Guo
A novel photocatalyst (Cu-TiO 2 @HQ) had been synthesized by combining Cu-doped TiO 2 nanoparticles with 8-Hydroxyquinoline (HQ) via hydrothermal method. The photocatalytic activities of Cu-TiO 2 @HQ were investigated by using phenol and tetrabromobisphenol A (TBBPA) as target pollutants, respectively. The results indicated that the degradation efficiencies of phenol and TBBPA by Cu-TiO 2 @HQ were 99.2% (in 30 min) and 99.4% (in 10 min) under visible light irradiation. Both of them were much better than that of pure TiO 2 (8.63% in 30 min) and Cu-TiO 2 (14.74% in 30 min). When phenol or TBBPA were degraded together with the reduction of Cr (VI), the reaction rate of each pollutant was significantly increased, and the cyclic stability of photocatalyst Cu-TiO 2 @HQ was greatly improved. Based on the spectroscopic and photoelectric characteristic analysis we found that in the mixture of phenol-Cr (VI) or TBBPA-Cr (VI) both photo-generated electrons and holes can be consumed simultaneously, thus preventing their recombination. The possible degradation products of phenol and TBBPA including its degradation path way were also analyzed by high resolution liquid chromatography-mass spectrometry-mass spectrometry.
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MOLECULES
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2020
·Vol. 25
·期 3
·694
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IF 3.267
Liang Ding,Xinxia Cui,Rui Jiang,Keya Zhou,Yalei Wen,Chenfeng Wang,Zhilian Yue,Shigang Shen,Xuefeng Pan
Liposomes are extensively used in drug delivery, while alginates are widely used in tissue engineering. However, liposomes are usually thermally unstable and drug-leaking when in liquids, while the drug carriers made of alginates show low loading capacities when used for drug delivery. Herein, we developed a type of thermo-responsible liposome–alginate composite hydrogel (TSPMAH) by grafting thermo-responsive liposomes onto alginates by using Ca2+ mediated bonding between the phosphatidic serine (PS) in the liposome membrane and the alginate. The temperature-sensitivity of the liposomes was actualized by using phospholipids comprising dipalmitoylphosphatidylcholine (DPPC) and PS and the liposomes were prepared by a thin-film dispersion method. The TSPMAH was then successfully prepared by bridge-linking the microcapsules onto the alginate hydrogel via PS-Ca2+-Carboxyl-alginate interaction. Characterizations of the TSPMAH were carried out using scanning electron microscopy, transform infrared spectroscopy, and laser scanning confocal microscopy, respectively. Their rheological property was also characterized by using a rheometer. Cytotoxicity evaluations of the TSPMAH showed that the composite hydrogel was biocompatible, safe, and non-toxic. Further, loading and thermos-inducible release of model drugs encapsulated by the TSPMAH as a drug carrier system was also studied by making protamine–siRNA complex-carrying TSPMAH drug carriers. Our results indicated that the TSPMAH described herein has great potentials to be further developed into an intelligent drug delivery system.Keywords:thermo-responsive liposome;phospholipid microcapsules;sodium alginate;hydrogel;protamine–siRNA complex;drug delivery
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MACROMOLECULES
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2020
·
IF 5.918
Qiong Li,Songqi Ma,Sheng Wang,Yanlin Liu,Muhammad Abu Taher,Binbo Wang,Kaifeng Huang,Xiwei Xu,Yingying Han,Jin Zhu
Recycling thermosets have become extremely important due to their ecological and economic benefits. The development of thermosets that undergo reversible polymerization provides a solution to the end-life disposal issue of thermosetting materials. However, the synthesis and recycling of the current chemically recyclable thermosets are harsh, complex, and energy-intensive, and their stability is often low. Here, we designed asymmetric acetal-containing thermosets (PRCs) from general phenolic resin and 1,4-cyclohexanedimethanol divinyl ether through one-step “click” cross-linking without using catalysts and solvents and without releasing small-molecule byproducts. PRCs exhibited conspicuous stress relaxation via a dissociative mechanism, corresponding to the superior malleability and reprocess recyclability. Importantly, PRCs presented excellent creep resistance even at 100 °C. In addition, PRCs could be readily and highly efficiently recovered to original phenolic resin via hydrolysis under specific mild acidic conditions but possessed high chemical stability under neutral conditions and even weak acidic conditions or acidic conditions in the absence of organic solvents with outstanding wettability and swellability toward the samples. Thermosets with different properties could be easily achieved via regulating raw materials. This work provides a promising dynamic covalent motif and a practical method to produce readily dual-recyclable (reprocess recyclable and chemically recyclable) thermosets with superior performance and stability.
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2020
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IF 7.489
Huanfang Zhou,Limin Chen,Shuting Li,Songqing Huang,Yingying Sun,Yanhong Chen,Zhao Wang,Wei Liu,Xinchun Li
A facile and green method for preparation of gold/palladium (Au/Pd) bimetallic nanoparticles interleaved reduced graphene oxide (rGO) composite was presented. One-step electroreduction of Au/Pd precursors and graphene oxide synergistically produced a multilayered and well-structured nanohybrid on glassy carbon electrode, which was explored as a highly efficient electrocatalyst . This operation is easy and controllable, as compared with time-consuming and procedure-tedious hydrothermal synthesis . The morphology and chemical constituents were meticulously characterized. The remarkable electrocatalytic performance of the prepared nanohybrid was demonstrated by detection of a high-risk carcinogen pollutant, hydrazine. By optimizing the preparation condition and investigating the electrochemical behavior, we achieved the sensitive analysis of hydrazine with ultralow oxidation overpotential. Amperometry was employed for constructing the quantitative calibration curve ; the steady-state current originating from hydrazine oxidation was proportional to the analytical concentration ranging from 0.1 μM to 200 μM, with the detection limit of 16 nM. Moreover, the nanohybrid displayed considerable anti-interfering ability with respect to hydrazine detection, as a variety of potentially coexisting substances produced negligible electrochemical response in the given analytical condition. Advantages including easy-to-preparation, high sensitivity and favorable selectivity , as well as broad linear response make the present method feasible for monitoring of hydrazine in water environment.
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Journal of Energy Chemistry
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2020
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IF 7.216
Huimin Liu,Yidan Zhang,Jingshan Luo
Ammonia synthesis by electrocatalytic nitrogen reduction reaction (NRR) is considered as a promising alternative to the Haber−Bosch process. However, due to the extremely low ammonia yield and easily accessible extraneous contamination in the laboratory, NRR study always suffers from fluctuation and variability. Finding and eliminating all kinds of possible extraneous contamination is crucial to evaluate the performance of electrocatalytic ammonia synthesis accurately. In this work, we systematically explored two factors that affect NRR results but are easy to be ignored: the selection of membrane for NRR and the unconscious N-source in NRR catalysts. After series of experiments, we proposed a low-cost and almost pollution-free Celgard 3501 membrane as the separator for NRR to avoid the adsorption and release of ammonia by the membrane. In addition, we proposed a pre-reduction strategy to remove residual or adsorbed NO x contaminants in catalysts. These two solutions will help the community to evaluate the NRR activity more accurately.
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