FOOD CHEMISTRY
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2021
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IF 7.514
Ru Zhao,Xinyu Yang,Aoqi Zhang,Tieyang Zhou,Yunwei Zhou,Lei Yang
Microwave-mediated immiscible binary solvent extraction (MIBSE) was applied to simultaneously extract oil and epigoitrin from Orychophragmus violaceus seeds . The upper phase of n -hexane was used to obtain oil, and the lower phase of ethanol solution was used to obtain epigoitrin. Factors potentially affecting the yields of oil and epigoitrin were systematically investigated. The optimum conditions were an ethanol volume fraction of 65%, liquid–solid ratio of lower-phase of 20 mL/g, liquid–solid ratio of upper-phase of 12 mL/g, microwave irradiation power of 393 W, and microwave irradiation time of 29 min. The actual yields of oil and epigoitrin were 34.08% ± 1.38% and 11.86 ± 0.47 mg/g, respectively. GC–MS analysis illustrated that the seed oils obtained by MIBSE and Soxhlet extraction exhibited similar fatty acid compositions. The separated epigoitrin was determined by HPLC analyses, which obtained a purity of 91.25% ± 3.83%, follwed by NMR determinations.
研究领域:
化学工程
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分析化学
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植物科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Yuzhi Liu,Chuang Wu,Wei Gao,Shuang Zhong,Wenbing Zhao,Shuai Xia,Haiyang Yu,Nan Shao,Yu Gao,Donglei Zou
Tailwater treatment from high-standard plastic-cleaning wastewater and red mud (RM) resource recycling pose major challenges. In this study, a heterogeneous microwave-responsive catalyst, RM/biochar (RM/BC), was successfully prepared to synergistically integrate magnetic and dielectric losses for activation of sodium percarbonate (SPC) to degrade the plastic additive diethyl phthalate (DEP). Characterization analyses revealed that under oxygen-limited conditions at 600 °C, poplar leaf powder was fully carbonized, while Fe 2 O 3 in RM was reduced to FeO and further transformed into Fe 3 O 4 , forming a composite dominated by amorphous carbon and Fe 3 O 4 . In RM/BC-600, Fe 3 O 4 and amorphous carbon collaboratively enabled dual hot-spot effects under microwave irradiation via magnetic and dielectric losses, accompanied by enriched oxygen vacancies. Hydroxyl radicals (•OH) were identified as the dominant reactive oxygen species (ROS) in SPC activation. Through single-factor and response surface optimization, under conditions of 40 μM DEP concentration, 4.03 mM SPC dosage, 6.24 g/L RM/BC-600 dosage, 87.2 °C reaction temperature, and 100 W microwave power, the optimal DEP removal efficiency reached 96.1 %. In-situ FTIR/Raman spectroscopy and EPR analysis demonstrated that RM/BC primarily facilitated SPC decomposition to hydrogen peroxide, with oxygen vacancies catalyzing hydrogen peroxide to generate •OH as the main ROS, supplemented by carbonate radicals (•CO 3 − ), superoxide radicals (•O 2 − ), and singlet oxygen ( 1 O 2 ), while dual hot-spot effects accelerated this process. HPLC-QTOF-MS identified 12 intermediate products, and plausible degradation pathways were proposed. ECOSAR software predicted reduced acute toxicity of degradation products, and seed germination assays confirmed minimal ecotoxicity of RM/BC to soil-plant systems. This study achieves RM resource recovery and hazard mitigation via a green strategy, enhancing plastic wastewater treatment through DEP detoxification and stability.
研究领域:
环境科学
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化学工程
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材料科学
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废弃物管理
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微波化学
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水处理技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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