ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 11
·31060-31076
·
IF 5.19
Qi Jiaxu,Liu Xingyu,Zhang Yupeng,Zhu Guanya,Tang Shanshan,Yu Xiaoxiao,Su Yingjie,Chen Siji,Liang Dadong,Chen Guang
A carbon material with both open macrochannel arrays and abundant micro/mesopores was prepared, characterized, and applied for removing chloramphenicol (CAP) from water. In the preparation process, Carex meyeriana Kunth (CM) with natural channel arrays was used as the precursor for producing the biochar, and NaOH was used for removing silicon and formatting micro- and mesopores of the porous carbon. The product (PCCM) exhibited the highest specific surface area (2700.24 m 2 g −1 ) among the reported CM-derived porous carbons. The adsorption performances of PCCM were evaluated through batch adsorption experiments. The maximum adsorption capacity of PCCM toward CAP was 1659.43 mg g −1 . The adsorption mechanism was investigated with the aid of theoretical calculations. Moreover, PCCM exhibited better performance than other porous carbon adsorbents in fixed-bed experiments, which may be due to its structural advantages.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2020
·
IF 4.244
Xianhe Cheng,Yinwei Cheng,Nijia Zhang,Shuang Zhao,Hao Cui,Hongli Zhou
Analytic hierarchy process (AHP) combined with response surface methodology (RSM) was used to optimize the purification processes of the crude flavonoids of Carex meyeriana Kunth (CMK). The bioactivities of flavonoids were evaluated in terms of antioxidant and antimicrobial activities. The weighted coefficients of comprehensive scoring method on AHP included recovery, purity, and decolorization rate. The optimal results were as follows: the sample concentration was 3.04 mg/mL, the ethanol concentration was 70.33 %, pH was 2.93, the elution velocity was 2.95 Bv/h, and the comprehensive score was 75.52 ± 0.53 % ( n = 3). The purified flavonoids of CMK (PFCMK) were compared with a reference substance through ultra high-performance liquid chromatography and ultraviolet spectra. Results of composition analyses were as follows: (−)−gallocatechin, 5−Caffeoylquinic acid, (−)−naringin, myricetin, luteolin, and isorhamnetin. The IC 50 values of 2,2–dIphenyl–1-picrylhydrazyl (0.034 mg/mL), hydroxyl radical method (0.643 mg/mL), and reducing power (0.025 mg/mL) showed that PFCMK had strong antioxidant activity. The minimum inhibitory concentrations on Bacillus pumilus, Bacillus subtilis, and Escherichia coli were 1.75, 1.75, and 0.875 mg/mL, respectively. PFCMK can be prepared as an antioxidant and antimicrobial for natural pharmaceutical, cosmetic products, and other industrial products.
研究领域:
药理学
·
化学工程
·
植物科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2018
·
IF 3.909
Zhengyu Hu,Penghui Wang,Hongli Zhou,Yaping Li
Response surface methodology (RSM) combined with a Box–Behnken design (BBD) was used to optimize the hot-water extraction (HWE) conditions which were determined to be: liquid-solid ratio 29.25:1 mL/g, extraction time 1.66 h, extraction temperature 95 °C, the optimized yield of polysaccharides 0.47 ± 0.01% ( n = 3). Hot-water extraction polysaccharides (HWEP) and Microwave-assisted extraction polysaccharides (MAEP) both consist of Rha:Xyl:Ara:Fru:Glu with the molar ratio of 1.05:1.21:3.86:1:3.61:4.5 and 1:1.95:1.72:1.78:4.36:6.18, respectively. Ultrasound-assisted extraction polysaccharides (UAEP) consists of Rha:Xyl:Ara:Fru:Man:Glu with the molar ratio of 1:2.31:5.23:1.05:3.17:4.17:7.89. The molecular weight distribution of HWEP, MAEP and UAEP ranged from 16 kDa to 1698 kDa, 15 kDa to 913 kDa, and 17 kDa to 1118 kDa, respectively. The absorption peaks in FT-IR confirmed the skeletal modes of the pyranose ring in polysaccharides. The second derivative of FT-IR proved difference of polysaccharides obtained from different extraction methods. The antioxidant activity investigations shown all three polysaccharides extracts possess high scavenging activity of DPPH radicals, hydroxyl radical and ABTS+ radical. Polysaccharides from Carex meyeriana Kunth (CMKP) might be potentially used for various practical applications such as medical and food industries, and this paper provides a theoretical basis and reference for further study of CMK.
研究领域:
植物化学
·
食品科学
·
药理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2017
·
IF 4.811
Xue Yang,Hui Liu,Fuyi Han,Shuai Jiang,Lifang Liu,Zhaopeng Xia
Cellulose nanocrystal (CNC) was extracted from Carex meyeriana Kunth (CMK) by a combination of TEMPO oxidation and mechanical homogenization method, and used to remove methylene blue (MB) from aqueous solution. After alkali-oxygen treatment, the aqueous biphasic system (polyethylene glycol/inorganic salt) was applied to further remove lignin from CMK. The characteriazation of CNC, and the effects of H 2 O 2 dosage, CNC dosage, adsorption time, and initial MB concentration on the MB removal capacity of CNC were investigated. The results showed that the removal percentage of MB by CNC was raised with the increase of H 2 O 2 and CNC dosage. The adsorption kinetics of prepared CNC followed the pseudo-second-order model, and the adsorption isotherms fitted well to the Langmuir model with a calculated maximum adsoption capacity of 217.4 mg/g, which was higher than those of CNC extracted by acid hydrolysis method, indicating CNC extracted from CMK had promising potentials in the field of MB adsorption.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）