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排序方式: 共有148条查询结果,搜索用时 31 毫秒
61.
62.
Min Li Shuai Liang Yang Wu Meiyue Yang Xia Huang 《Frontiers of Environmental Science & Engineering》2020,14(6):107
63.
微波辐照碳酸钾化学活化法制备菌渣活性炭 总被引:1,自引:0,他引:1
以食用菌渣为原料,以K2CO3为活化剂,利用微波辐照加热法制备活性炭。采用正交实验设计,研究了活化功率、活化时间、K2CO3与菌渣质量比、浸渍时间对活性炭碘值及得率的影响。实验结果表明,活化时间、活化功率、K2CO3与菌渣质量比对活性炭碘值影响显著,浸渍时间对活性炭碘值影响不显著;对活性炭得率,各因素影响均不显著。综合考虑碘值和得率2个指标,实验得出的最佳活性炭制备工艺条件为:活化功率560 W,活化时间20 min,K2CO3与菌渣质量比0.8,浸渍时间20 h。 相似文献
64.
Zhang Y Xiong X Han Y Zhang X Shen F Deng S Xiao H Yang X Yang G Peng H 《Chemosphere》2012,88(2):145-154
Photoelectrocatalytic (PEC) technology involved applying an electrical bias to a TiO2 film electrode, has been widely applied to the degradation of refractory organic pollutants, owing to its high degradation efficiency. This paper reviews recent developments in the PEC degradation of recalcitrant organic contaminants using a TiO2 film electrode. The preparation and application of various TiO2 film electrodes have been investigated, as well as the parameters that influence PEC activity such as the crystal structure, the film thickness and substrate material, the applied electrical bias, the solution pH and conductivity. The improvement of PEC activity by doping the TiO2 film electrode with metal and non-metal ions has been discussed. The mechanism and kinetics for the PEC degradation of organic pollutants have also been highlighted. 相似文献
65.
Polybrominated biphenyls have been widely used as flameretardants in textile and electronic industries, and additives in plastics. Over the past few decades, much attention has been given to polybrominated biphenyls in the environment and their effects on humans. In this paper, we studied on the degradation of 4,4′-dibromobiphenyl, a typical one of polybrominated biphenyls, through photoelectrocatalytic process with TiO2, Zr/TiO2 and Zr, N/TiO2 nanotube arrays. The results showed that the photoelectrocatalytic process was more efficient than photocatalytic and electrolytic process alone. The results exhibited that the photoelectrocatalytic efficiency was significantly affected by the properties of the catalysts and bias potential, and the highest photoelectrocatalytic degradation rate was achieved with Zr, N/TiO2 at 1 V and the order was Zr, N/TiO2 > Zr/TiO2 > TiO2. The mechanism was also discussed by detecting the changes of pH value, bromine anion, total organic carbon and intermediates during the process. 相似文献
66.
Justine Coppinger Sarah Alliman Allen N. Lamb Beth S. Torchia Bassem A. Bejjani Lisa G. Shaffer 《黑龙江环境通报》2009,29(12):1156-1166
67.
李衍 《中国特种设备安全》2013,(12):43-47
介绍超声相控阵扇形(s型)扫查法对焊缝实施全体积检测的优势:信号(色码幅度)实时显示,自动存储,特别是检测数据可三维(5D)显示,又可多视角观测,缺陷四定(定位、定性、定量、定级)更方便,符合国际权威法规ASME最新版(2011a)的有关要求。期盼UT人员能在日常焊缝检测中熟练运用相控阵三维可视化技术。 相似文献
68.
在压力容器的超声检测中,为解决传统相控阵(PA)二维成像存在缺陷图像畸变,难以准确定性等问题,采用1种基于全聚焦法(TFM)的实时超声成像技术,使用一维线阵和二维面阵分别对孔等典型实际缺陷进行扫查,获得缺陷的二维和三维图像,从定量角度对比分析2者的准确度。结果表明:该方法获得的三维图像测量误差在8%以内,具有更高的精确度和检出率,对于孔类缺陷的还原度更高,这对于缺陷检测与评估以及和特种设备的安全生产具有重要意义。 相似文献
69.
70.
Hao Yu Chuan Chen Jincai M Wenzong Liu Jizhong Zhou Duu-Jong Lee Nanqi Ren Aijie Wang 《环境科学学报(英文版)》2014,26(7):1375-1382
The elemental sulfur (S^0) recover), was evaluated in the presence of hi,ate in two development models of simultaneous desulfurization and denitrification (SDD) process. At the loading rates of 0.9 kg S/(m^3.day) for sulfide and 0.4 kg N/(m^3.day) for nitrate, SO conversion rate was 91.1% in denitrifying sulfide removal (DSR) model which was higher than in integrated simultaneous desulfurization and denitrification (ISDD) model (25.6%). A comprehensive analysis of functional diversity, structure and metabolic potential of microbial communities was examined in two models by using functional gene array (GeoChip 2.0). GeoChip data indicated that diversity indices, community structure, and abundance of functional genes were distinct between two models. Diversity indices (Simpson's diversity index (1/D) and Shannon-Weaver index (H′)) of all detected genes showed that with elevated infiuent loading rate, the functional diversity decreased in ISDD model but increased in DSR model. In contrast to ISDD model, the overall abundance of dsr genes was lower in DSR model, while some functional genes targeting from nitrate-reducing sulfide-oxidizingbacteria {NR-SOB), such as Thiobacillus denitrficans, Sulfurimonas denitrificans, and Paracoccus pantotrophus were more abundant in DSR model which were highly associated with the change of SO conversion rate obtained in two models. The results obtained in this study provide additional insights into the microbial metabolic mechanisms involved in ISDD and DSR models, which in turn will improve the overall performance of SDD process. 相似文献