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11.
Guanglong Pang Donghui Wang Yunhong Zhang Chunyan Ma Zhengping Hao 《Frontiers of Environmental Science & Engineering》2016,10(3):447-457
MnO2 microspheres with various surface structures were prepared using the hydrothermal method, and Au/MnO2 catalysts were synthesized using the sol-gel method. We obtained three MnO2 microspheres and Au/MnO2 samples: coherent solid spheres covered with wire-like nanostructures, solid spheres with nanosheets, and hierarchical hollow microspheres with nanoplatelets and nanorods. We investigated the properties and catalytic activities of formaldehyde oxidation at room temperature. Crystalline structures of MnO2 are the main factor affecting the catalytic activities of these samples, and γ-MnO2 shows high catalytic performance. The excellent redox properties are responsible for the catalytic ability of γ-MnO2. The gold-supported interaction can change the redox properties of catalysts and accelerate surface oxygen species transition, which can account for the catalytic activity enhancement of Au/MnO2. We also studied intermediate species. The dioxymethylene (DOM) and formate species formed on the catalyst surface were considered intermediates, and were ultimately transformed into hydrocarbonate and carbonate and then decomposed into CO2. A proposed mechanism of formaldehyde oxidation over Au/MnO2 catalysts was also obtained. 相似文献
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以2010年的LandsatTM遥感影像图和武夷新区总体规划中新区2030年土地利用规划图为基础数据,在RS和GIS技术支持下,结合马尔科夫模型和景观生态学方法分析了未来武夷新区的土地利用与案观格局变化。结果表明:在规划实施后,建设用地通过占用耕地和林地而大面积增加,使得林地和耕地相应减少,人类活动对景观的干扰强度增大,区域景观斑块形状趋于规则简单化,斑块总数有所减少,平均斑块面积增大,景观连接度增强,破碎化程度降低,景观多样性增加。 相似文献
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通过采用聚合氯化铝铁(PAFC)、氯化铁(FeCl3)及聚合硫酸铁(PFS)对含镉废水的处理研究表明,三种混凝剂对含镉水体均有良好的处理效果,同等条件下,三种混凝剂对含镉水体去除率分别为98.22%、92.19%和93.63%。研究了PAFC对含镉水体的混凝沉淀效果,实验结果表明:碱性条件有利于镉离子的沉淀,当pH为9~11时,去除率可达98.00%左右;对于初始浓度为4.000 0 mg.L-1的含镉废水,经处理后,水体浓度可降至0.184 0 mg.L-1,对于初始浓度为0.400 0 mg.L-1的含镉废水,经处理后水体浓度降至0.007 2 mg.L-1;废水中投加一定量的石灰乳对PAFC除镉起一定的作用,投加量达30.00 mg.L-1时,其去除率达99.91%;通过对PAFC除镉动力学拟合,符合一级线性动力学方程。 相似文献
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An organo-montmorillonite-supported nanoscale zero-valent iron material(M-NZVI) was synthesized to degrade decabromodiphenyl ether(BDE-209). The results showed that nanoscale zero-valent iron had good dispersion on organo-montmorillonite and was present as a core-shell structure with a particle size range of nanoscale iron between 30–90 nm, characterized by XRD, SEM, TEM, XRF, ICP-AES, and XPS. The results of the degradation of BDE-209 by M-NZVI showed that the efficiency of M-NZVI in removing BDE-209 was much higher than that of NZVI. The efficiency of M-NZVI in removing BDE-209 decreased as the pH and the initial dissolved oxygen content of the reaction solution increased, but increased as the proportion of water in the reaction solution increased. 相似文献
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Carbon dioxide(CO2) emissions are a leading contributor to the negative effects of global warming. Globally, research has focused on effective means of reducing and mitigating CO2 emissions. In this study, we examined the efficacy of eco-industrial parks(EIPs) and accelerated mineral carbonation techniques in reducing CO2 emissions in South Korea.First, we used Logarithmic Mean Divisia Index(LMDI) analysis to determine the trends in carbon production and mitigation at the existing EIPs. We found that, although CO2 was generated as byproducts and wastes of production at these EIPs, improved energy intensity effects occurred at all EIPs, and we strongly believe that EIPs are a strong alternative to traditional industrial complexes for reducing net carbon emissions. We also examined the optimal conditions for using accelerated mineral carbonation to dispose of hazardous fly ash produced through the incineration of municipal solid wastes at these EIPs. We determined that this technique most efficiently sequestered CO2 when micro-bubbling, low flow rate inlet gas, and ammonia additives were employed. 相似文献
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畜禽养殖业是"十二五"期间氨氮总量减排的重点,其清洁生产与末端治理技术种类繁多,不同技术在不同应用条件下减排效果差别显著。深入分析了国内外畜禽养殖业发展与污染现状,系统归纳了国内畜禽养殖业氨氮总量减排技术区域特征,综合使用层次-灰色综合评判法、费用-效益法、表单法等对氨氮总量减排技术进行了综合性的评价研究,构建了基于面向服务架构(SOA)的氨氮减排技术评估咨询平台。结果表明,氨氮总量减排技术评估方法与平台可大幅度提高技术评价的效率和精确度,可广泛应用于企业和管理部门氨氮减排的工程技术与环境管理工作。 相似文献
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Pang Wancheng Hou Dejia Nowar Elhosseny E. Chen Huanchun Zhang Jibin Zhang Guoping Li Qing Wang Shucai 《Environmental science and pollution research international》2020,27(34):42767-42777
Environmental Science and Pollution Research - Currently, sustainable utilization, including recycling and valorization, is becoming increasingly popular in waste management. Black soldier fly... 相似文献
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