Three kinds of iron nanoparticles(FeNPs)were prepared via green route based on pomegranate(PG),green tea(GT),and mulberry(ML)extracts under ambient conditions.The obtained materials were characterized by scanning elec...Three kinds of iron nanoparticles(FeNPs)were prepared via green route based on pomegranate(PG),green tea(GT),and mulberry(ML)extracts under ambient conditions.The obtained materials were characterized by scanning electron microscopy(SEM),transmission electronic microscopy(TEM),X-ray energy-dispersive spectrometer(EDS),X-ray diffraction(XRD),fourier transform infrared spectroscopy(FTIR),and X-ray photoelectron spectroscopy(XPS)techniques.The experimental results show that FeNPs were in the form of amorphous iron(Ⅱ,Ⅲ)-polyphenol complex with different dispersity and morphologies.GT-Fe has the smallest size range of 25-35 nm,PG-Fe has a moderate size-distribution of 30-40 nm,while ML-Fe formed a tuberous net-type with a sheeting structure.PG-Fe displays the highest removal efficiency of 90.2%in 20 min towards cationic dye of malachite green(16.6%by ML-Fe and 69.3%by GT-Fe),which is attributed to its highest polyphenol content,lowest zeta potential,as well as the most Fe^(2+)on the surface of FeNPs.The removal mechanism was mainly induced by electrostatic adsorption based on pH and zeta potential tests.展开更多
文章为提高高校影响力和服务地方中学的能力,在发挥高校学生专业特点的基础上,通过高等教育资源下沉服务基本思想,以期促进中学生物教学改革。主要通过文献资料法、问卷调查法、访谈法、逻辑分析法和实地考察法对应用型高校社团服务陕西...文章为提高高校影响力和服务地方中学的能力,在发挥高校学生专业特点的基础上,通过高等教育资源下沉服务基本思想,以期促进中学生物教学改革。主要通过文献资料法、问卷调查法、访谈法、逻辑分析法和实地考察法对应用型高校社团服务陕西省12所中学生物学科教学的实践路径进行了有益探索。结果表明,高校社团(教师和学生)可通过科普活动、中学生进高校、假期支教以及师范生顶岗实习等形式来促进中学生生物学科学习的热情和兴趣,相关活动有助于提高中学学生生物学科学习成绩、改善中学师资结构、促进中学教学改革创新,同时可通过高校先进教学理念推动中学生物教育改革与发展。This article aims to enhance the influence of universities and their ability to serve local secondary schools. Based on leveraging the professional characteristics of university students, the basic idea of sinking higher education resources into services is adopted to promote the reform of secondary school biology teaching. Mainly through literature review, questionnaire survey, interview, logical analysis, and field investigation, this study explores the practical path of applied university clubs serving the teaching of biology in 12 middle schools in Shaanxi Province. The results indicate that university clubs (teachers and students) can promote the enthusiasm and interest of middle school students in learning biology through forms such as science popularization activities, school students entering universities, holiday teaching support, and teacher training internships. Relevant activities can help improve the academic performance of middle school students in biology, improve the structure of secondary school teachers, and promote teaching reform and innovation in secondary school. At the same time, advanced teaching concepts in universities can promote the reform and development of secondary school biology education.展开更多
基金Funded by the Hubei Provincial Natural Science Foundation of China(No.2024AFB946)the Excellent Young and Middle-aged Science and Technology Innovation Team Plan of Hubei Colleges(No.T201824)。
文摘Three kinds of iron nanoparticles(FeNPs)were prepared via green route based on pomegranate(PG),green tea(GT),and mulberry(ML)extracts under ambient conditions.The obtained materials were characterized by scanning electron microscopy(SEM),transmission electronic microscopy(TEM),X-ray energy-dispersive spectrometer(EDS),X-ray diffraction(XRD),fourier transform infrared spectroscopy(FTIR),and X-ray photoelectron spectroscopy(XPS)techniques.The experimental results show that FeNPs were in the form of amorphous iron(Ⅱ,Ⅲ)-polyphenol complex with different dispersity and morphologies.GT-Fe has the smallest size range of 25-35 nm,PG-Fe has a moderate size-distribution of 30-40 nm,while ML-Fe formed a tuberous net-type with a sheeting structure.PG-Fe displays the highest removal efficiency of 90.2%in 20 min towards cationic dye of malachite green(16.6%by ML-Fe and 69.3%by GT-Fe),which is attributed to its highest polyphenol content,lowest zeta potential,as well as the most Fe^(2+)on the surface of FeNPs.The removal mechanism was mainly induced by electrostatic adsorption based on pH and zeta potential tests.
文摘文章为提高高校影响力和服务地方中学的能力,在发挥高校学生专业特点的基础上,通过高等教育资源下沉服务基本思想,以期促进中学生物教学改革。主要通过文献资料法、问卷调查法、访谈法、逻辑分析法和实地考察法对应用型高校社团服务陕西省12所中学生物学科教学的实践路径进行了有益探索。结果表明,高校社团(教师和学生)可通过科普活动、中学生进高校、假期支教以及师范生顶岗实习等形式来促进中学生生物学科学习的热情和兴趣,相关活动有助于提高中学学生生物学科学习成绩、改善中学师资结构、促进中学教学改革创新,同时可通过高校先进教学理念推动中学生物教育改革与发展。This article aims to enhance the influence of universities and their ability to serve local secondary schools. Based on leveraging the professional characteristics of university students, the basic idea of sinking higher education resources into services is adopted to promote the reform of secondary school biology teaching. Mainly through literature review, questionnaire survey, interview, logical analysis, and field investigation, this study explores the practical path of applied university clubs serving the teaching of biology in 12 middle schools in Shaanxi Province. The results indicate that university clubs (teachers and students) can promote the enthusiasm and interest of middle school students in learning biology through forms such as science popularization activities, school students entering universities, holiday teaching support, and teacher training internships. Relevant activities can help improve the academic performance of middle school students in biology, improve the structure of secondary school teachers, and promote teaching reform and innovation in secondary school. At the same time, advanced teaching concepts in universities can promote the reform and development of secondary school biology education.
