CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Xueming Lin,Yongwen Ma,Jinquan Wan,Yan Wang
LiCoPO 4 (LCP) synthesized particles, which used a conventional solid-state method, were applied as activators for the first time to activate peroxymonosulfate (PMS) with diethyl phthalate (DEP) as the target pollutant. Contrast tests presented that LCP possessed excellent ability of activating PMS for pollutant removal without controlling pH. About 98.6% of DEP could be removed in 6 min with 0.1 g L −1 LCP and 0.15 g L −1 PMS. Rating under different concentrations of Co 2+ and leaching solution, activation tests indicated that LCP/PMS system involved in heterogeneous and homogeneous reaction. To reduce the homogeneous effect of Co 2+ ions, LCP dose decreased to 0.01 g L −1 , and the time for entire removal of DEP was extended to 60 min. Technologies such as Scanning electron microscope (SEM), X-ray diffraction (XRD), Raman and X-ray photoelectron spectroscopy (XPS) were employed to characterize the particles before and after the reaction. It was found that characterizations of samples had little change and that the DEP removal efficiencies showed no significant reduction after 3 cycles. Sulfate radicals and hydroxyl radicals existed together to make great contributions. This study presented the proposed mechanism of radical production in LCP/PMS system for the DEP removal. Co 2+ /Co 3+ cycle in heterogeneous surface and homogeneous solution play important roles in the process of PMS activation . This report would help to understand the mechanism of PMS activation on LCP and offered an alternative environment-friendly scheme for pollutant removal.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2021
·
IF 7.963
Hui Zhang,Demin Kong,Lei Wang,Wei Xia,Congyu Yao,Jing Wu
Plastic products made of polyethylene (PE), polypropylene (PP), and polystyrene (PS) are widely used in daily life and industrial production. Polyolefins—which have a very stable structure and do not contain any active molecular groups—are difficult to degrade and pose a serious global environment threat. This study selected latex clearing protein (Lcp K30 ) derived from Streptomyces sp. Strain K30. The natural substrate of the enzyme is rubber ( cis -1, 4-polyisoprene), and the site of action is the carbon‑carbon double bond. Lcp K30 was incubated with UV-irradiated polyolefin PE, PP and PS (UV-PE, UV-PP, and UV-PS containing carbon‑carbon double bonds) for 5 d at 37 °C. The results showed that UV-PE-Lcp K30 was more fragmented than UV-PE-blank; the Fourier transform infrared spectroscopy results showed that UV-PE-Lcp K30 and UV-PP-Lcp K30 produced new active groups (e.g., –OH and –C=O); however, the effect on UV-PS was not significant. Scanning electron microscopy results showed that the treated group had more obvious roughness, cracks, and pits than the control group. The results of high-temperature gel permeation chromatography showed that the average molecular weight (M w ) of UV-PE-Lcp K30 and UV-PP-Lcp K30 decreased; the M w of UV-PE5-Lcp K30 was reduced by 42.02%. The results of gas chromatography–mass spectrometry showed the production of ketones. Therefore, the Lcp K30 latex clearing protein degrade UV-oxidized polyolefin plastics and has great potential for PE and PP degradation but may not be suitable for PS. Furthermore, other Lcps (such as Lcp NRRL , Lcp NVL3 ) can also degrade UV-PE.
研究领域:
环境科学
·
微生物学
·
聚合物化学
·
生物技术
✓ 已验证
DOI
PubMed
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2021
·
IF 6.953
Fengwei Ma,Hongbing Liu,Su Xu,Yongyou Cheng,Qiang Fei,Haijiang Chen
A water-soluble polysaccharide (LCP-05) was isolated from the flowers of Leucosceptrum canum Smith. LCP-05 was an acidic polysaccharide with a molecular weight of approximately 8.9 kDa. Monosaccharide composition analysis indicated that LCP-05 was composed of Man, Rha, GlcA, GalA, Glc, Gal and Ara in a molar ratio of 0.83:1.68:0.33:2.15:1.00:1.45:1.22. The framework of LCP-05 was speculated to be a branched rhamnogalacturonan with the backbone consisting of α-1,2,4-linked Rha p and α-1,4-linked GalA p , and bearing branches at the O -4 position of the Rha residues. The side chains are terminated primarily with the Ara f and Glc p residues. LCP-05 was found to be able to significantly induce the production of NO, IL-6, and TNF-α in RAW 264.7 cells, and to induce RAW 264.7 cell's suppressive effect on both cell growth and cell migration of 4 T1 mammary breast cancer cells.
研究领域:
植物学
·
免疫学
·
药理学
·
癌症研究
✓ 已验证
DOI
PubMed
高影响因子
Energy Technology
·
2018
·Vol. 7
·期 1
·122-130
·
IF 3.175
Shi Wang,Hao Xu,Ailian Wang,Xu Liu,Jie Chen,Zhinan Wang,Di Feng,Qinghui Zeng,Liaoyun Zhang
An inorganic-polymeric hybrid all-solid-state electrolyte (SSE) composed of chemically modified nano-silica, linear poly(trifluoroethyl methacrylate)-co-poly(poly(ethylene glycol) methyl ether methacrylate copolymer (PTFEMA-co-PPEGMA or LCP) and lithium salt is prepared and used in lithium-ion batteries (LIBs) for the first time. Nano-silica is transformed to SiO 2 -SH via esterification reaction. Then, SiO 2 -PEGMA is synthesized through click chemistry of SiO 2 -SH and PEGMA. The compatibility of the nano-SiO 2 and the LCP can be effectively improved due to the excellent dispersibility of the chemically modified nano-SiO 2 in the polymer matrix. As a result, the hybrid SSE has good thermal stability, excellent film-forming ability. Furthermore, the hybrid SSE shows superior comprehensive electrochemical properties, which makes the corresponding LiFePO 4 /Li cells have good cycling performance (the discharge capacity reaches 144 mAh g −1 at 0.3 C) and rate capability (90 mAh g −1 is reached at 1 C). Thus, the hybrid electrolyte can be a powerful SSE for high-safety and high-performance LIBs.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）