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21.
Chu Yao Suhe Zhao Yaqin Wang Bingwu Wang Meiling Wei Minghan Hu 《Polymer Degradation and Stability》2013
A microbe with desulfurizing capability, Alicyclobacillus sp., was selected to recycle waste latex rubber (WLR). The growth characteristics of the microorganism and the technical conditions in the co-culture desulfurization process were studied. The desulfurization effect of Alicyclobacillus sp. on the WLR was characterized, and the mechanism for the microbial desulfurization of WLR was tentatively explored. The results showed that adding 5% (w/v) WLR into medium had little effect on the growth of Alicyclobacillus sp. The surfactant polysorbate 80 (Tween 80) had a toxic effect on Alicyclobacillus sp., but the growth of the microbe was vigorous if the proper technique was used: the mixing of WLR with Tween 80, followed by the addition of the mixture into the culture media. With the increase of desulfurization time, the swelling value of desulfurizated waste latex rubber (DWLR) increased, but the crosslink density decreased. After co-culture desulfurization for 8–10 days, a DWLR with good desulfurization effect was obtained. The mechanical properties of natural rubber (NR)/DWLR composite improved significantly over those of NR/WLR composite. XPS and FTIR results revealed that Alicyclobacillus sp. could break the crosslinked sulfur bonds and oxidize them to sulfones groups. The increase of O element content on the surface of DWLR was confirmed by water contact angle measurements. The relationship between the crosslink density and sol fraction of DWLR with different desulfurization times agreed with the Horikx equation, an indication that the microorganisms could break the crosslinked sulfur bonds on the surface of WLR, but leaving the main chains intact. 相似文献
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An casy preparation of controlled alumina nanoparticles by the solution precipitate method has been carried out using dendrimer as surfactant.The effects of the amount and size of surfactant on morphological control of powder have also been discussed. 相似文献
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糠醛系氮配位螯合树脂对贵金属元素的吸附性能 总被引:4,自引:0,他引:4
呋喃衍生物糠醛与二乙烯三胺反应制得了含有Schiff碱基,胺基及大共轭π键地的氮配位螯合树脂,应用电感耦合等离子体发射光谱研究了所得螯合树脂对贵金属元素Au,Pd,Pt,Rh,Ru,Ir及重金属元素Hg的吸附性能。结果表明,所得螯合树脂在较宽的酸度范围内能很好地吸附Au,Pd,Pt,Rh,Ru元素,具有优良的吸附选择性及较高的富集倍数,特别是对Au能达到定量吸附与洗脱,同时,在一定酸度条件下亦对Pt,Ir及Hg显示良好的吸附性能。 相似文献
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(ZnBaLa)BO3:Eu^3+的合成与发光的研究 总被引:2,自引:3,他引:2
高温固相扩散法合成了发光材料Zn1.5xBa1.5yLa1-x-y-z)BO3∶Eu3+z(x+y+z<0.4).对样品进行了XRD和IR分析,结果表明:在空气中900 ℃条件下,合成了荧光体样品,LaBO3中La3+离子被部分Zn2+和Ba2+离子取代使晶系发生了变化,LaBO3属于正交晶系,而(Zn0.27Ba0.24La0.61)BO3∶Eu3+0.05经过XRD属于立方晶系,a=0.639 7,V=0.261 8 nm3.扫描电镜测其晶貌,平均粒度为22 μm左右.样品的激发光谱和发射光谱显示:在基质BO3结构中O2—Eu3+的CT带位于295 nm,Eu3+的强发射来自5D0→7F1和5D0→7F2跃迁,存在磁偶极和电偶极两种跃迁. 相似文献
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邻香草醛缩丙氨酸盐及邻菲咯啉与Ln(Ⅲ)三元配合物的合成与表征 总被引:2,自引:1,他引:2
某些水扬醛类氨基酸的金属配合物具有特殊的性质和应用[1 ,2 ] ,近年来 ,过渡金属离子的此类希夫碱配合物有不少报道。本工作在无水乙醇体系中 ,用稀土硝酸盐与邻香草醛缩丙氨酸钾及邻菲咯啉作用合成了未见文献报道的三种混配配合物 ,并对其组成和配位方式进行了研究。1 实验部分1 1 主要仪器与试剂美国Bio RadFIS1 65型红外光谱仪 ,KBr压片 ;美国PE2 4 0 0 (Ⅱ )型元素分析仪 ;岛津UV 30 0 0双光束分光光度计 ;DDS 1 1A型电导率仪 ;德国STA40 9ZP热分析仪。Ln2 O3纯度高于 99 9% ;DL α 丙氨酸为生化试剂… 相似文献
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Direct evidence of effects of surface plasmon resonance(SPR) of gold nanorods(GNRs) on dual-band light absorption enhancement with coupling dye molecules was reported by introducing gold nanorod@SiO2(GNR@SiO2) core-shell nanoparticles into a photoelectric conversion system. GNR with asymmetric shape had unusual anisotropic SPR[transversal surface plasmon resonance(TSPR) and longitudinal surface plasmon resonance(LSPR)]. The excellent SPR of GNR made it a promising candidate as enhancing light absorption material to increase power conversion efficiency(PCE). The PCE was improved nearly 17.2% upon incorporating GNRs, mostly due to the increase in Jsc, while Voc and FF were unchanged. The improvement was mostly contributed by the SPR of the GNRs with coupling of N719. And there was also a complementary to N719 in visible light range. Therefore, SPR is an effective tool in improving the photocurrent and consequently enhancement of PCE. The TSPR and LSPR effects of GNRs on light harvesting were reflected in the increased monochromatic incident photon-to-electron conversion efficiency(IPCE). We also utilized finite-difference time-domain(FDTD) to investigate the light coupling of GNRs with TiO2. Compare to the base anode, the IPCE of optimized electrode showed significant improvement and peaks broadening at 500-600 nm and 610-710 nm. We got an increase in overall conversion efficiency from 6.4% to 7.5%. 相似文献
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选择了市场上口碑好、占有率高的3款便携式水质现场应急检测设备,通过准确度、精密度、检测时长及价格等指标,以权重积分法对3款仪器进行了比选,结果表明德国MN公司的PF-12型便携式多参数分光光度计的综合性能最优. 相似文献