Sub-5 nm nanobowl gaps electrochemically templated by SiO2-coated Au nanoparticles as surface-enhanced Raman scattering hot spots

National Natural Science Foundation of China [20873037, 91027037, J1103312, J1210040, 21173171, 11074210]Large-area submonolayer and monolayer Au nanoparticle (NP) arrays with sub-5 nm nanobowl gaps for giant electromagnetic enhancement were created by partially embedding SiO2-coated Au NP arrays in an electrochemically deposited Au film, followed by the removal of the SiO2 shells

Advanced Treatment of the Petrochemical Wastewater Based on O_3/UV Technique

石化行业中的炼油污水经过常规处理工艺后各种有害物质含量虽已达到排放标准,但含量仍较高,长期直接排放必然会导致环境问题,最好的解决办法是对污水进行深度处理后循环利用.针对这种要求,以福建炼油厂的生化池出水为目标水,利用臭氧/紫外线法进行深度处理实验研究,使其满足回用标准,补充到生产用水管线中,参加下一轮的生产循环.实验中对臭氧浓度(分别采用10、20、30、40 g/h的臭氧加入量)及紫外线对水质处理的影响(有或无紫外线)进行了实验分析.试验所用的臭氧发生器为青岛国林生产的CF-G-3-040G型臭氧发生器,其功率为500 W;紫外线灯为广东雪莱特生产的单端紫外线灯,其功率为40 W,峰值波长为253.7 nm;反应器则为自行设计、容积170 L的普通玻璃容器.文中还给出了处理污水达到回用标准所用时间与所加臭氧/紫外线的关系,对该厂下一步的污水深度处理回用技术具有实际的指导意义.Even though the wastewater drained from refinery has reached the discharging standard after processing in the factory,the concentration of pollutants remain very high and will result in environmental problems in the long run without further treatment.Therefore,a further processing should be launched to make it reach recyclable standard.In this paper,the samples of the wastewater taken from Fujian Refinery and the O3/UV advancement treatment method is adopted to make it reusable and recyclable to the production water pipe.Different O3 concentration(10,20,30,40 g/h) and with/without UV input have been studied in this process.In the experiment,the O3 generator with mode type CF-G-3040Gis manufactured by Qingdao Guolin Company Ltd.with rated power 500 W;the single ended UV lamp is manufactured by Guangdong Bright Star Company Ltd.with rated power 40 W and peak wavelength 253.7 nm;the reaction vessel is the ordinary 170 L glass container designed by ourselves.The relation between the processing time and the input quantity of the O3/UV was described,which should play an important pragmatic role in directing them in wastewater advanced treatment

RESEARCH ON PRETREATMENT OF REFINERY ORGANIC ALKALI WASTEWATER WITH HIGH CONCENTRATION

经实验比较了UVO3、UVH2O2、UVTiO2H2O2系统对炼油高浓度废碱水的降解。结果表明,3种方法均有较好的效果,在本实验条件下,UVTiO2H2O2法的除油效果明显。在UVO3系统中,紫外光使废水CODCr、油、酚的降解率分别提高24%、31%、28%,特别是将废水BOD5CODCr值平均提高到0.45,有效地改善了废水的可生化性,因此是一种较好的预处理技术,同时该实验也为进一步的动态实验奠定基础。It is compared that the degradation of refinery organic alkali wastewater with high concentration by UV/O_3,UV/H_2O_2 and UV/TiO_2/H_2O_2 systems.The results show that three methods all have good degradation effect.On condition of the experiment, UV/TiO_2/H_2O_2 process has an obvious effect of oil removal.In the UV/O_3 system ultraviolet light makes the degradation rates of COD_ Cr,oil and phenol in the watewater increase by 24%,31% and 28% respectively,and particularly let the average of BOD/COD_ Cr raise by 0.45.Thus the biodegradability of the wastewater is improved effectively

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies