Arabian Journal of Chemistry
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2022
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IF 6.212
Jiacheng Li,Lisha Liao,Yannan Jia,Tian Tian,Shiwei Gao,Chenyue Zhang,Wei Shen,Zheng Wang
In this study, the preparation of magnetic Fe 3 O 4 /ZIF-8 (MFZ) and its adsorption properties for Cd(II) from water were investigated. Various characterizations demonstrate that the as-prepared MFZ has well magnetic-separation performance and thermal stability. In batch adsorption tests, the effects of pH, initial concentration, and adsorbent dosage were evaluated. According to the findings, when the pH is 7 and the dosage is 150 mg/L, the adsorption capacity for a 40 mg/L Cd(II) solution reaches 102.3 mg/g in 180 min. The Cd(II) adsorption processes was found to correspond to pseudo-first-order kinetics and Langmuir model according to the adsorption kinetics and isotherms. The Langmuir model predicted a maximal saturation adsorption capacity of 160.26 mg/g at 298 K. Thermodynamic analysis revealed that the Cd(II) adsorption is an endothermic, spontaneous process. Ion exchange, coordination reaction, and electrostatic interaction are all involved in Cd(II) adsorption by MFZ. The optimum conditions for Cd(II) adsorption were proposed and confirmed in accordance with the results of the response surface optimization experiments. Furthermore, regeneration tests demonstrate the great repeated regeneration ability of MFZ. According to the anticipated production cost, treating wastewater with a Cd(II) concentration of 40 mg/L would cost roughly US$ 8.35/m 3 . MFZ showed good potential for Cd(II) removal from water.
研究领域:
环境科学
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材料科学
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化学工程
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DOI
高影响因子
PREPARATIVE BIOCHEMISTRY & BIOTECHNOLOGY
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2023
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IF 2.9
Dongyu Gu,Shanshan Tang,Chang Liu,Dajun He,Jing Tian,Yi Yang
Coprinus comatus is an edible and medicinal fungus. In this study, the antioxidant activity of the fermentation product of C. comatus was investigated through optimization of fermentation process. The results indicated that the fermentation product of C. comatus had obvious scavenging ability for 2,2’-Azino-bis(3-ethylbenzothiazoline)-6-sulphonic acid (ABTS) free radical. The EC50 of the n-butanol extract from the fermentation product on ABTS·+ was 0.65 ± 0.02 mg/mL. On this basis, the liquid fermentation conditions of C. comatus were optimized through single factor and response surface optimization experiments according to the scavenging ability of ABTS·+ to improve the antioxidant capacity of the fermentation product. The results showed that when the 14% of C. comatus was fermented in a culture medium with a C/N ratio of 48:1 for 6 days, the ABTS·+ scavenging ability was the strongest, and the EC50 of n-butanol extract was 0.57 ± 0.01 mg/mL, which was 12.31% higher than the initial activity. This study laid the foundation for the development of C. comatus.
研究领域:
微生物学
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食品科学
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生物技术
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DOI
PubMed
高影响因子
PREPARATIVE BIOCHEMISTRY & BIOTECHNOLOGY
·
2023
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IF 2.9
Jifeng Wang,Shanshan Tang,Shuang Guo,Dongyu Gu,Yi Wang,Jing Tian,Yi Yang
Agaricus bisporus is one of the most widely cultivated edible mushrooms in the world. The chemical components of A. bisporus have a wide range of biological activities. In order to deeply understand the antioxidant properties of A. bisporus, this study conducted an investigation on the components of A. bisporus fermentation. Through the single factor experiment and response surface optimization, it was found that when the C/N ratio was 45:1, the inoculum concentration was 10%, and the fermentation time was 7 d, the n-butanol extract of the fermentation product had the strongest scavenging capacity for free radical generated through 2,2'-azino-bis(3-ethylbenzothiazoline)-6-sulphonic acid (ABTS·+). The concentration for 50% of the maximal effect (EC50) was 0.33 ± 0.01 mg/mL. Moreover, in order to identify the two main components, the elution–extrusion counter-current chromatography (EECCC) was employed for separation, where 5,5'-oxy-dimethyl-bis(2-furfuraldehyde) and 5-(butoxymethyl) furfural were obtained. The antioxidant activity of 5,5'-oxy-dimethyl-bis(2-furfuraldehyde) (EC50 = 0.26 ± 0.01 mg/mL) was superior to that of 5-butylmethyl furfural (EC50 = 1.52 ± 0.02 mg/mL), indicating that 5,5'-oxy-dimethyl-bis(2-furfuraldehyde) was the main antioxidant in the fermentation products. The thermodynamic parameters and frontier molecular orbitals of 5,5'-oxy-dimethyl-bis (2-furanaldehyde) was evaluated by density functional theory (DFT). The result indicated 5,5'-oxy-dimethyl-bis(2-furanaldehyde) scavenged free radicals in polar media through single electron transfer followed by proton transfer (SET-PT).
研究领域:
食品科学
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生物化学
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发酵工程
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DOI
PubMed
高影响因子
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
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2019
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IF 4.527
Tenghao Wang,Yi Zhou,Shixin Cao,Jian Lu,Yanbo Zhou
Excess sulfonamides are discharged into the environmental system due to the abuse of antibiotics, which threatens the ecological environment and human health. In this study, the ferric and ferrous as well as calcium peroxide (CP), sodium percarbonate (SPC) and sodium persulfate (SPS) have been used to build Fenton-like system for the sulfanilamide (SA) removal. Compared with other Fenton-like system, the Fe 3+ /CP system exhibited better degradation capacity and 94.65% SA was removed with 3.0 mM CP and 3.0 mM Fe 3+ . A response surface and corresponding quadratic regression equation were obtained by using a three-level Box-Behnken factorial design with the initial pH value and the dosage of Fe 3+ and CP as the model parameters. Depended on the result of the response surface, the optimum conditions of the removal of SA in Fe 3+ /CP system could be obtained: [Fe 3+ ] = 2.96 mM, [CaO 2 ] = 2.33 mM and [pH] = 6.45. Besides that, the influences of Na + , Mg 2+ , Cl - , HCO 3 - , NO 3 - and HA on SA removal were also investigated under the optimum condition. The results revealed that the high concentration of HCO 3 - was able to inhibit degradation of SA while other ions and HA have little effect on SA degradation. These results provided a novel strategy to evaluate the catalyst/oxidant system by combining experiment and computer simulation in wastewater treatment .
研究领域:
环境科学
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废水处理
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DOI
PubMed
高影响因子
Desalination and Water Treatment
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2024
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IF 1
Tian Tian,Yannan Jia,Jianguo Wu,Jinlong Zhao,Kai Xu,Zijie Wang,Zheng Wang
With the increasing threat antimony (Sb) pollution poses to the environment, its removal from water is becoming increasingly important. Accordingly, metal-organic frameworks (MOFs) are garnering increasing research attention owing to their excellent performance as adsorbents. Here, the MOF MIL-101(Cr)-NH 2 was prepared directly by solvothermal synthesis. Sb(III) adsorption using MIL- 101(Cr)-NH 2 was evaluated systematically at varying adsorbent dosages and pHs. And the adsorption kinetics, isotherms, and thermodynamics were explored by altering the contact time, initial Sb(III) concentration, and temperature, respectively. The results revealed that Sb(III) was adsorbed onto MIL-101(Cr)-NH 2 very quickly, even at low antimony concentrations. The maximum Sb(III) adsorption capacity of MIL-101-NH 2 is 83.61 mg g -1 . In the presence of coexisting ion (NO 3 - ), the amount of Sb(III) adsorbed was slightly increased, which may be due to the formation of an inner-sphere complex. The Box–Behnken method was used to design and optimize a response surface with reference to three main influencing factors, that is, dosage, pH, and temperature, so as to obtain a multivariate quadratic model of adsorption behavior and identify the optimal adsorption conditions. Finally, a preliminary economic analysis of the synthetic material was carried out.
研究领域:
环境科学
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材料科学
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化学工程
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环境污染治理
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吸附技术
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DOI
高影响因子
SOLVENT EXTRACTION RESEARCH AND DEVELOPMENT-JAPAN
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2023
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IF 0.7
Xiaoxiao LIU,Wenqing ZHANG,Tiantian FEI,Xiaosong HU,Zhongli HU,Surong JIN
In this work, deep eutectic solvent (DES) combined with ultrasonic-assisted extraction was proposed to extract free seleno-amino acids from Cardamine hupingshanensis. The contents of seleno-amino acids in the extract were determined by high-performance liquid chromatography with a fluorescence detector (HPLC-FLD). Response surface design was used to optimize the extraction conditions such as ultrasonic time, ultrasonic temperature, and liquid-solid ratio. The results showed that DES prepared by choline chloride and ethylene glycol had the highest extraction efficiency of seleno-amino acids. The main free seleno-amino acids in Cardamine hupingshanensis were selenocystine (SeCys2) and selenomethylcysteine (SeMeCys). The optimal extraction conditions were as follows: liquid-solid ratio of 50 mL·g–1; extraction temperature of 40 °C; and extraction time of 45 min. Under the optimal extraction conditions, the SeCys2 and SeMeCys contents were 356 μg·g–1 and 147 μg·g–1, respectively. This study shows that DES has great potential in extraction and separation.
研究领域:
植物化学
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分析化学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2016
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IF 3.138
Bing-Jie Chen,Mei-Jia Shi,Shuai Cui,Shu-Xian Hao,Robert C Hider,Tao Zhou
An efficient method for the degradation of polysaccharides isolated from Sargassum fusiforme (PSF) was developed by using ascorbic acid in combination with H 2 O 2 . The degradation conditions were optimized using a Box-Behnken response surface design (BBRS). The optimum conditions were established as: concentration of ascorbic acid (V C ) and H 2 O 2 17.26 mM, degradation temperature 51 °C and degradation time 1.6 h. The DPPH radical scavenging rate of the degraded polysaccharides from S. fusiforme (DPSF) obtained under the optimal conditions was determined to be 75.22 ± 0.02%, which was well matched with the value (75.21%) predicted by the BBRS model. In vitro antioxidant activity of the polysaccharides was evaluated by determining their radical (hydroxyl radical, superoxide anion radical and DPPH radical) scavenging abilities, and ferric iron reducing power. The inhibitory activity on tyrosinase of DPSF was also evaluated. The results indicate that the degraded polysaccharide has superior antioxidant activity and anti-tyrosinase effect to those of the original polysaccharide.
研究领域:
海洋生物学
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食品科学
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药理学
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产品关联
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
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2018
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IF 4.61
Yibei Wan,Xiao Liu,Penglei Liu,Lei Zhao,Weihua Zou
Polydopamine microspheres (PDMPs) synthesized by a facile solution oxidation method were adopted as a potential adsorbent for the removal of Norfloxacin (NOR) from aqueous solution. The morphologies and properties of PDMPs were characterized using TEM , SEM, FTIR and pH PZC . Parameters effects such as contact time, initial pH, initial concentration and ionic strength on the adsorption capacity of NOR onto PDMPs were studied. To maximize NOR removal from liquid phase, Box–Behnken experimental design (BBD) combined with response surface modeling (RSM) was employed based on the 17 preliminary experiments at 308 K. Optimum contact time, initial NOR concentration and initial pH value were found to be 97 min, 303 mg·L −1 and 6.6, respectively, the corresponding NOR removal capacity was found to be 307 mg·g −1 . Batch adsorption experiments under the optimal conditions were conducted to investigate kinetics, thermodynamics and adsorption isotherm. Kinetic analysis confirmed that the kinetic data were well described by Pseudo-second order model. The experimental equilibrium data were well fitted by Langmuir, Redlich-Peterson, Koble-Corrigan and Dubinin-Radushkevich models. Thermodynamic parameters such as Gibbs free energy , enthalpy and entropy were calculated and the results indicated that the NOR adsorption onto PDMPs was spontaneous and endothermic. The adsorption process may be attributed to the electrostatic interaction, the formation of hydrogen bonds or π-π stacking interactions among the polydopamine (PDA) and NOR molecule.
研究领域:
环境科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
Journal of Applied Research on Medicinal and Aromatic Plants
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2022
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IF 3.945
Zhanjun Li,Yibin Xu,Yunwei Liu,Ke Ma,Kunlun Wang,Fengjian Yang
Tea saponin was used for UAE of oil from Pinus koraiensis seed scales for the first time, and the extraction kinetic model was fitted and compared with that of traditional SE. Considering the relationship among the oil yield, proanthocyanidins content and solvent properties, ethanol was selected as the optimum extraction solvent. PBD and BBD were used to determine the optimal conditions: 63% aqueous ethanol solution, liquid-to-material ratio was 11:1 mL/g, ultrasonic power was 100 W, ultrasonic duration was 15 min, temperature was 45 °C, and the dose of tea saponin was 0.3%. Under the optimal conditions, the oil yield and proanthocyanidins content from P. koraiensis seed scales were 22.73 ± 0.42% and 3.04 mg/g ± 0.08%, respectively. The actual operating value was consistent with the theoretically predicted value. Comparison of the extraction kinetics model, oil components, physical and chemical properties, antioxidants, microstructure of oil residue, energy consumption and ecological emission characteristics of UAE and SE shows that UAE is a more advantageous technique.
研究领域:
植物化学
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食品科学与工程
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产品关联
DOI
高影响因子
RSC Advances
·
2023
·Vol. 13
·期 50
·35629-35638
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IF 3.9
Xincheng Peng,Deqin Zhu,Jingjing Liu,Ligang Wei,Na Liu,Li Wei,Guolin Shao,Qingda An
Pretreatments with aqueous protic ionic liquid (PIL)–ethanolamine bis(oxalate) ([MEA][(HOA)(H2OA)]), combined with ultrasonic disintegration, were employed in cellulose nanofibril (CNF) production from pulp fibers. The optimization of pretreatment parameters is crucial for obtaining the maximum CNF yield. The response surface methodology was used to design the pretreatment conditions for preparing CNFs. This method consists of four factors: pretreatment time (A, 2–4 h), pretreatment temperature (B, 100–120 °C), liquid-to-solid ratio (C, 60–80 g g−1), and PIL content (D, 20–40%). The predicted CNF yield (Y) followed a quadratic multinomial regression equation represented by Y = 84.43 + 3.59A + 8.22B + 2.22C − 2.13D − 0.85AB + 2.83AC + 5.95AD + 0.43BC − 2.98BD + 4.25CD − 6.04A2 − 18.23B2 − 4.98C2 − 7.39D2. The regression equation exhibited high model fit to the experimental CNF yields as evidenced by a determination coefficient of 0.9764. Results showed that a maximum CNF yield of 86.2% was obtained in the case with the following conditions: pretreatment temperature of 112 °C, pretreatment time of 3.2 h, liquid-to-solid ratio of 83 g g−1, and PIL content of 29%. CNFs with high crystalline index (64.0%) and thermal stability (Tmax = 348 °C) were prepared. This work favors the development of low cost PIL-based pretreatment systems for the clean production of CNFs.
研究领域:
材料科学
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化学工程
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纳米技术
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产品关联
DOI
PubMed
高影响因子
International Journal of Environmental Research and Public Health
·
2022
·Vol. 19
·期 16
·9923
·
IF 4.614
Tiao Zhang,Cui Hu,Qian Li,Chuxin Chen,Jianhui Hu,Xiaoyu Xiao,Mi Li,Xiaoming Zou,Liangliang Huang
Biochar (BC)-supported sulfide-modified nanoscale zerovalent iron (S-nZVI/BC) was prepared using the liquid-phase reduction method for the application of the removal of sulfamethazine (SMZ) from water. The reaction conditions were optimized by the Box–Behnken response surface method (RSM). A model was constructed based on the influence factors of the removal rate, i.e., the carbon-to-iron ratio (C/Fe), iron-sulfur ratio (Fe/S), pH, and hydrogen peroxide (H2O2) concentration, and the influence of each factor on the removal efficiency was investigated. The optimal removal process parameters were determined based on theoretical and experimental results. The results showed that the removal efficiency was significantly affected by the C/Fe ratio and pH (p< 0.0001) but relatively weakly affected by the Fe/S ratio (p= 0.0973) and H2O2concentration (p= 0.022). The optimal removal process parameters were as follows: 0.1 mol/L H2O2, a pH of 3.18, a C/Fe ratio of 0.411, and a Fe/S ratio of 59.75. The removal rate of SMZ by S-nZVI/BC was 100% under these conditions. Therefore, it is feasible to use the Box–Behnken RSM to optimize the removal of emerging pollutants in water bodies by S-nZVI/BC.Keywords:response surface optimization;biochar-supported sulfide-modified nanoscale zerovalent iron;sulfamethazine;Box–Behnken design
研究领域:
环境科学
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材料科学
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DOI
PubMed
高影响因子
JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2022
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IF 8.91
Xia Qin,Ziyuan Wang,Chengrui Guo,Rui Guo,Yue Lv,Mingran Li
In this study, Cu-Fe bimetallic magnetic chitosan carbon aerogel catalyst (Cu-Fe@CS) was prepared by the sol-gel method to degrade Fulvic acid (FA) in Fenton-like system. Degradation experiment results showed bimetallic catalyst Cu-Fe@CS can degrade more FA than monometallic catalysts (Cu@CS and Fe@CS) due to the synergistic effect between the copper and iron. Plackett Buiman (PB) design showed that pH and temperature exhibited significant influence on FA degradation. The significant factors were optimized by Central Composite Design (CCD), the results revealed that the maximum FA removal reached 96.59% under the conditions of pH 4.07 and temperature 93.77 °C, the corresponding TOC removal reached 77.7%. The kinetic analysis implied that the reaction followed pseudo-first order kinetic with correlation coefficient (R 2 ) = 0.9939. The Arrhenius fitting analysis revealed that Cu–Fe@CS had a lower activation energy (Ea) than Cu@CS and Fe@CS, meaning that reaction was easier to occur in Fenten-like system with Cu–Fe@CS. Catalyst still remained the higher FA and TOC removals of 96.28% and 77.33% after six runs, respectively. The FA removal was reduced by 65.53% with 12 mmol tertiary butanol (TBA) as scavenger, indicating that •OH played an important role in FA degradation. Finally, the catalytic degradation mechanism was proposed.
研究领域:
环境科学
·
催化化学
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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）