JOURNAL OF HAZARDOUS MATERIALS
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2023
·
IF 13.6
Jibao Deng,Hefei Wang,Yan Su,Ke Shen,Xuwen Chen,Xian Zhou,Xiaojie Hu,Yanzheng Gao
Microwave irradiation is a promising technology for the remediation of soil contaminated by organic contaminants . However, the roles of volatilization and decomposition in microwave removal of polycyclic aromatic hydrocarbons (PAHs) in soil have not yet been quantitatively determined. A model describing the removal efficiency of benz(a)anthracene (BaA) at different treatment times and varied conditions was constructed, wherein BaA removal efficiency was positively and linearly correlated with soil temperature . BaA removal in soil was attributed to thermal volatilization (97.8%) and decomposition (2.2%). Radicals such as ∙OH and ∙O 2 − were found to initiate BaA decomposition, the pathway of which was elucidated through HPLC-MS analysis, revealing benz(a)anthracene-7,12-dione as the main intermediate product. The new ideas and perspectives founded in this study offer theoretical support for microwave remediation of organic compound–contaminated sites.
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高影响因子
POLYMER COMPOSITES
·
2023
·
IF 5.2
Ruijie Han,Zhijing Han,Xudong Song,Wei Cui,Jin Peng,Guangshuai Dong,Kangmin Niu
Silicone rubber is widely used in medical and equipment manufacturing fields due to its excellent sealing and solvent resistance. However, the hydrophobicity of silicone rubber was unsatisfactory for many advanced engineering structures and applications. Generally, the preparation of artificial superhydrophobic materials suffered from either complicated in process or poor in environmental protection. Here, we reported a simple method to prepare silicone rubber composites with excellent superhydrophobic properties (water contact angle [WCA] = 155.2°) from low-cost hydrophilic silica. Tests showed that the uniform micro-nano structures were the key to the superhydrophobic properties of silicone rubber composites. The bounce test observed the rebound of water droplets with different initial velocities (0.77, 1, and 2 m/s) impacting silicone rubber surface, and verified the great advantages of silicone rubber modified by silica in hydrophobic. The modification method shown in this work provides a simple way to manufacture non-fluorinated, robustness superhydrophobic surfaces for a wide range of potential applications. Highlights Based on the improvement of micro-nano structure of the matrix surface by industrial silica, the preparation of superhydrophobic silicone rubber composites was realized. A process method for preparing fluorine-free superhydrophobic silicone rubber composites from hydrophilic silica was proposed. Stretchability and robustness were the key factors for successful superhydrophobic modification of silicone rubber elastomers.
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高影响因子
Catalysts
·
2023
·Vol. 13
·期 11
·1392
·
IF 3.9
Cuicui Wu,Kaifei Tian,Xuan Guo,Yunming Fang
The transition from fossil resources to renewable biomass for the production of valuable chemicals and biobased fuels is a crucial step towards carbon neutrality. Squalene, a valuable chemical extensively used in the energy, healthcare, and pharmaceutical fields, has traditionally been isolated from the liver oils of deep-sea sharks and plant seed oils. In this study, a biochemical synergistic conversion strategy was designed and realized to convert glucose to squalene by combining fermentation technology in yeast with reductive coupling treatment of dienes. First, glucose derived from hydrolysis of cellulose was used as a renewable resource, using genetically engineeredSaccharomyces cerevisiaeas the initial biocatalyst to produce β-farnesene with a titer of 27.6 g/L in a 2.5 L bioreactor. Subsequently, intermediate β-farnesene was successfully converted to squalene through the organopalladium-catalyzed reductive coupling reaction involving the formation of Pd(0)L2species. Under mild reaction conditions, impressive β-farnesene conversion (99%) and squalene selectivity (100%) were achieved over the Pd(acac)2catalyst at a temperature of 75 °C in an ethanol solvent after 5 h. This advancement may provide insights into broadening squalene production channels and accessing the complex skeletons of natural terpenoids from biorenewable carbon sources, offering practical significance and economic benefits.Keywords:squalene;β-farnesene;fermentation technology;reductive coupling of dienes;Saccharomyces cerevisiae
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高影响因子
Advanced Materials Technologies
·
2023
·Vol. 9
·期 4
·2301628
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IF 6.8
Yongjie Yu,Haibo Xu,Enhai Song,Dengfeng Peng,Keyu Han,Shiqing Xu,Gongxun Bai
Flexible sensors have attracted extensive research interest due to their great application potential in biodetection, flexible display, and wearable devices. However, they still have a lot of room for improvement in terms of luminous color, flexibility, and self-powered systems. A wearable, antifreeze, and discoloration sensing system based on electroluminescence, mechanoluminescence, and tribo-power generation is developed in this paper. Triboelectric nanogenerator systems can harvest biomechanical energy from hand clapping and knee/elbow bending to generate real-time electrical signals. The use of dielectric materials reduces the initial voltage and frequency of light-emitting devices, enabling them to be driven by Triboelectric nanogenerators. At the same time, the device can produce red, blue, white, and other multicolor light. In addition, the system can produce an optical signal output due to external mechanical stimulation. As a result, the sensor system is simple to manufacture and unique to operate, proving its potential applications in areas such as cold-resistant displays, wearable optoelectronics, soft robotics, and electronic skin.
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高影响因子
ENVIRONMENTAL POLLUTION
·
2021
·
IF 8.071
Ziqing Zhu,Yinying Dai,Rui Zhang,Jiaqi Shi,Xuesheng Zhang,Bingxiang Liu,Mingbao Feng
Polychlorinated dibenzothiophenes (PCDTs) are a class of compounds structurally similar to dioxins that possess various toxicological impacts on living organisms. Unfortunately, information on the levels of PCDTs in freshwater lakes in China is still scarce. In this work, the occurrence of 14 congeners of PCDTs in different matrices (i.e., sediment, suspended particulate matter (SPM), and water) of Chaohu Lake was investigated. It was determined that the concentrations of 14 PCDTs (Σ 14 PCDTs) in the sediment, SPM, and surface water were 0.40–3.55 ng g −1 (dry weight, d.w.), 0.38–2.95 ng·g −1 d.w., and 0.34–2.61 ng L −1 , respectively. The dominant congener found in sediments was 1,2,3,4,7-penta-CDT (19.54%), and 1,3,9-tri-CDT was the predominant congener in SPM (19.13%) and water (20.08%). Medium- and high-chlorinated PCDTs were detected as the major compounds in sediments and SPM. The low-chlorinated PCDTs (e.g., mono-CDTs) have higher relative percentages in the water than those detected in the sediment samples. The annual Σ 14 PCDT input of the eight main tributaries to Chaohu Lake was 19.90 kg. A strong linear correlation between the Σ 14 PCDT levels and the organic carbon (OC) content demonstrated that OC had an important influence on the PCDT redistribution in Chaohu Lake. In addition, the organic carbon normalized partitioning coefficient (log K OC ) of PCDTs in the SPM-water system in Chaohu Lake was 1.95–2.49 mL g −1 , and correlations between log K OC and other typical environment-related properties of PCDTs were established. This study provided useful data on the evaluation of ecological risks of PCDTs in Chaohu Lake.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 45
·期 17
·7659-7670
·
IF 3.591
Kangjun Xie,Zhen Dong,Nan Wang,Wei Qi,Long Zhao
The selective elimination of radioactive TcO4− from radioactive waste is becoming increasingly critical for environmental security. In this work, a series of novel adsorbents (Si-IL-X, X = NO3, Cl, BF4, NTf2) modified with ionic liquids containing different anions (X) were synthesized via radiation grafting of 1-vinyl-3-ethylimidazolium tetrafluoroborate onto silanized silica and subsequent anion replacement. The surface and structural properties of the prepared adsorbents were characterized by FT-IR spectroscopy, TGA, XPS, and SEM-EDS. Subsequently, their adsorption properties for ReO4− (a nonradioactive surrogate of TcO4−) were studied in detail via batch and column experiments. The batch experiments indicated that the Si-IL-X showed high ReO4− removal efficiency over a broad pH range of 3–10, and their maximum adsorption capacities were in the range of 147.93–289.02 mg g−1 against ReO4−. It was found that the adsorption ability of Si-IL-X was related to the anion structure of the ionic liquid, and the order was Si-IL-NO3 > Si-IL-Cl > Si-IL-BF4 > Si-IL-NTf2, which was mainly determined by the hydrophilicity and ionic radius of the anions. Besides, their adsorption capacities barely decreased after electron beam radiation of 800 kGy. In column experiments, the adsorbents exhibited excellent selectivity and could capture ReO4− efficiently from simulated radioactive wastewater containing a large number of coexisting ions. In addition, the XPS and FT-IR spectroscopic analyses indicated that adsorption was carried out by an ion-exchange process. The results suggested that Si-IL-X showed excellent application prospect for efficient capture of TcO4− from Hanford waste and other common acidic radioactive wastes.
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高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2021
·
IF 9.028
Yuanchen Chen,Chuan Yan,Zhe Sun,Yonghui Wang,Shu Tao,Guofeng Shen,Tongqin Xu,Peixue Zhou,Xiaoping Cao,Fusheng Wang,Shuqing Wang,Shoushen Hao,Hefang Yang,Hongjun Li,Quan Zhang,Weiping Liu,Meirong Zhao,Zhibin Zhang
Organochlorine pesticides (OCPs) have been used worldwide on an enormous scale over the last century but are banned globally due to environmental persistence and ecotoxicity in recent decades. The long-term effects of OCP ban for agricultural use in China since 1983 on the reproductive health of small terrestrial mammals have never been evaluated in the field. We examined the residue dynamics of OCPs and the reproductive performance of Chinese striped hamsters (Cricetulus barabensis) in North China Plain during 1983–2010 and concluded that the exposure levels of OCPs in hamsters drastically decreased from 2900 ± 740 to 25.2 ± 6.88 ng/g with an average half-life of 5.08 yrs, coinciding with the observed reproductive recovery of hamsters. The population-based reproductive performance of hamsters was significantly and negatively associated with OCP exposure levels after adjusting the contributions from climate and population density factors, indicating that the ban of OCPs has facilitated the reproductive recovery of hamsters by up to 81% contribution. Our findings suggest that the OCP ban is effective to restore reproduction of small terrestrial mammals. Integration of population biology and environmental science is essential to assess the impacts of persistent organic pollutants on ecological safety and biodiversity loss under accelerated global change.
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高影响因子
SYNTHETIC COMMUNICATIONS
·
2021
·
IF 2.007
Xiaoyun Ma,Daoping Wang,Gang Wei,Qingdi Zhou,Xiuhai Gan
Two series of quinoxaline–chalcone conjugates have been prepared by aldolic condensation and aromatic nucleophilic substitution reaction, and their anticancer activity against three cancer cell lines including benign prostatic hyperplasia epithelial cell (BPH-1), neuron-like rat pheochromocytoma cell line (PC12) and human breast cancer cell line (MCF-7) were evaluated in vitro. All of the synthesized compounds exhibited moderate to good activity against the cancer cell lines selected. Particularly, Compound A5 showed the excellent potent activity against BPH-1 and MCF-7 with IC50 values of 10.4 and 9.1 μM, respectively, which is similar to doxorubicin (14.1 and 9.2 μM, respectively). As well as compound B6 exhibited most excellent activity toward PC12 with IC50 values of 16.4 μM. Compound A10 exhibited 55.4, 36.8 and 54.5 folds higher selectivity for BPH-1, PC12 and MCF-7 cells than for HEK-293 cell, respectively. In addition, theoretical biological activities of compounds A5 and A10 were evaluated by SwissADME.
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高影响因子
APPLIED SURFACE SCIENCE
·
2021
·
IF 6.707
Kangjun Xie,Zhen Dong,Maolin Zhai,Weiqun Shi,Long Zhao
As a radioactive fission product, 99 Tc always existed in the combined extreme conditions of super acidity, high ionic strength, and strong radiation field, which made the efficient removal of Tc a challenge. Herein, for the first time, a series of n-alkyl-imidazolium ionic liquids were grafted onto silanized silica using radiation technique. The surface and structure properties of prepared adsorbents (SiO 2 -MPTS-[C n VIm]Br) were characterized by FT-IR, TGA, XPS, BET, and SEM-EDS. Subsequently, their adsorption properties for ReO 4 − (a nonradioactive surrogate of TcO 4 − ) were studied in detail. These adsorbents exhibited an adsorption capacity of approximately 190 mg g −1 for ReO 4 − . It was found that adsorbents with longer alkyl chains showed better selectivity against ReO 4 − under the conditions of strong acids and a large excess of competitive ions. Column experiments indicated that these adsorbents could be recycled 10 times with negligible capacity loss. In addition, their adsorption performance remained unchanged after 800 kGy radiation. The column experiments of treating simulated radioactive wastewater proved that SiO 2 -MPTS-[C n VIm]Br was promising for selective separation of TcO 4 − /ReO 4 − from a variety of fission products. Lastly, XPS and FT-IR analysis confirmed that the adsorption mechanism was based on ion-exchange.
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高影响因子
RSC Advances
·
2021
·Vol. 11
·期 52
·33036-33047
·
IF 3.361
Ying Li,Fei Lu,Qing-zhi Li,Yi-hua Zhou,Jun Qian,Sheng Cao,Chen-yu Wang
Copper ion (Cu2+) plays an important role in the human body because it is beneficial for metabolism. However, an excessive or slight amount of Cu2+ can cause various symptoms. Therefore, it is necessary for human health to realize the trace and visual detection of Cu2+. Referring to traditional fluorescence test papers, the qualitative and semi-quantitative detection of Cu2+ could be realized by a dual-carbon dots (CDs) ratiometric fluorescent paper-based sensor with the advantages of environmental protection, portability and low cost. In this paper, the inkjet-printed test paper with the best mixing ratio of the two CDs has been researched to maximize the spectral energy transfer of ion detection (maximum color gamut expansion). Among them, the preparation method of b-CDs has been improved, increasing the photoluminescence quantum yield (PLQY) to 88.9%. The sensitivity detection limit of the double emission ratio sensor was 0.15 nM in solution, and the human eye can distinguish at least 3 μmol L−1 Cu2+ in the paper-based sensor. Compared with the traditional single-emission sensor, the human eye was more sensitive to the color change of the emission ratio sensor. The results indicate that we not only realized the micro detection of Cu2+ with convenient methods, but also provided a promising strategy for the visual detection of Cu2+.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Xiaoxiao Chen,Mengyao Liu,Lijuan Zhang,Yunshan Zhou,Enming Ping,Chunyan Ding
ZIF-67@NH 2 –SiO 2 composites were prepared by loading the metal-organic frameworks ZIF-67 on amino modified SiO 2 gel particles (NH 2 –SiO 2 , 80–100 mesh) through layer-by-layer self-assembly method. Systematic investigation on the effects of ZIF-67 loading amounts on NH 2 –SiO 2 packed stainless steel chromatographic column (specification 1.0 m×2.0 mm I.D.), the flow rate of He as carrier gas and the injection amount of mixed gas (H 2 /D 2 ) on the hydrogen isotope H 2 /D 2 separation performance at liquid nitrogen temperature, unraveled the optimal conditions for H 2 /D 2 isotope separation . The results showed that the optimal stationary phase materials under the optimized conditions can effectively separate H 2 and D 2 with separation resolution R = 1.52 and the separation time t = 10.15 min. The superior performance of the ZIF-67 is tentatively thought to be due to kinetic quantum sieving (pore size 3.3 Å) effect and chemical affinity sieving effect of Co ion in ZIF-67.
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高影响因子
ACS Applied Nano Materials
·
2020
·
IF 0
Jun Wang,Qing Kuang,Xiaofang Su,Xiaowen Lu,Leipeng Leng,Mingyang Zhang,Chunmu Guo,Tong Li,Qian Xu,Shuhui Sun,J. Hugh Horton,Wei Wu,Zhijun Li
Supported single-atom catalysts have become one of the most exciting frontiers in heterogeneous catalysis. The physicochemical properties of these materials are highly interesting; however, the generation of stable single atoms on solid supports is still challenging. Herein, we report an efficient and operationally simple postsynthesis method, consisting of spatial confining, freeze-drying, and reducing steps, for the construction of singly dispersed palladium atoms on SAPO-31 (Pd1/SAPO-31) with promising application prospects in the semihydrogenation of alkynes. A typical Pd–N–C single-atom catalyst derived from the ZIF-8-supported palladium complex was prepared and compared to Pd1/SAPO-31. The Pd1/SAPO-31 catalyst showed outstanding performance in the semihydrogenation of both phenylacetylene (85% selectivity at 99% conversion, 40 min) and 1-chloro-4-ethynylbenzene (95% selectivity at 99% conversion, 60 min). In addition, this single-atom palladium catalyst was highly active in triethoxysilane oxidation. Most importantly, this catalyst retained its atomic dispersion and catalytic activity after high-temperature thermal treatment in Ar at 700 °C. This study demonstrates how zeolites can be used to confine atomically dispersed metal species and tune the activity and stability of these materials to meet the needs of practical applications.
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危险品化学品经营许可证（带存储）