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91.
92.
Haiyan Jiang Hongxing Dai Xue Meng Lei Zhang Jiguang Deng Yuxi Liu Chak Tong Au 《环境科学学报(英文版)》2012,24(3):449-457
Monoclinic BiVO4 with multiple morphologies and/or porous structures were fabricated using the hydrothermal strategy. The materials were characterized by means of the XRD, Raman, TGA/DSC, SEM, XPS, and UV-Vis techniques. The photocatalytic activities of the BiVO4 materials were evaluated for the degradation of Methyl Orange under visible-light irradiation. It is observed that pH value and surfactant exerted a great effect on the morphology and pore structure of the BiVO4 product. Spherical BiVO4 with porous structures, flower-cluster-like BiVO4, and flower-bundle-like BiVO4 were generated hydrothermally at 100℃ with poly(vinyl pyrrolidone) (PVP) and urea (pH = 2) and at 160℃ with NaHCO3 (pH = 7 and 8), respectively. The PVP-derived BiVO4 showed much higher surface areas (5.0-8.4 m2/g) and narrower bandgap energies (2.45-2.49 eV). The best photocatalytic performance of the spherical BiVO4 material with a surface area of 8.4 m2/g was associated with its higher surface area, narrower bandgap energy, higher surface oxygen vacancy density, and unique porous architecture. 相似文献
93.
94.
北武夷长寿源银铅(锌)矿床地质特征 总被引:1,自引:0,他引:1
长寿源银铅(锌)矿区位于武夷隆起北侧。矿体赋存于震旦系洪山组上段的层间破碎带内,呈层状、似层状产出。矿体沿走向具尖灭再现、膨大缩小特征,剖面上呈似层状、透镜状;矿体厚度变化较稳定,有用组份分布较均匀。矿体产状:倾向177-196°,倾角61-75°,与地层产状基本一致。矿石构造以脉状、网脉状、块状构造为主。矿物成分较复杂,主要有方铅矿、深红银矿、辉银矿、自然银、闪锌矿、黄铜矿、金等。围岩蚀变主要有硅化、绢云母化、黄铁矿化、绿泥石化、碳酸盐化、萤石化、高岭土化等。矿床属于层间破碎带热液充填交代型银铅(锌)矿床。 相似文献
95.
An activated semi-coke with industrial-scale size was prepared by high-pressure hydrothermal chemistry activation, HNO3 oxidation and calcination activation in proper order from Inner Mongolia Zhalainuoer semi-coke, which is rich in resource and cheap in sale.SO2 adsorption capacity on this activated semi-coke was assessed in the fixed bed in the temperature range of 60-170℃, space velocity range of 500-1300 h^-1, SO2 concentration of 1000-3000 ppmv, and N2 as balance. The surface area, elemental and proximate analysis for both raw semi-coke and activated semi-cokes were measured. The experimental results showed that the activated semi-coke has a high adsorption capacity for sulfur dioxide than the untreated semi-coke. This may be the result of increase of surface area on activated semi-coke and surface oxygen functional groups with basicity characteristics. Comparison to result of FTIR, it is known that group of-C-O-C-may be active center of SO2 catalytic adsorption on activated semi-coke. 相似文献
96.
Yanfeng Wang Wei Chen Xiao Chen Huajun Feng Dongsheng Shen Bin Huang Yufeng Ji Yuyang Zhou Yuxiang Liang 《环境科学学报(英文版)》2018,30(3):347-355
Cd S/Mo S_2,an extremely efficient photocatalyst,has been extensively used in hydrogen photoproduction and pollutant degradation.Cd S/Mo S_2can be synthesized by a facile one-step hydrothermal process.However,the effect of the sulfur source on the synthesis of Cd S/Mo S_2via one-step hydrothermal methods has seldom been investigated.We report herein a series of one-step hydrothermal preparations of Cd S/Mo S_2using three different sulfur sources:thioacetamide,L-cysteine,and thiourea.The results revealed that the sulfur source strongly affected the crystallization,morphology,elemental composition and ultraviolet(UV)–visible-light-absorption ability of the Cd S/Mo S_2.Among the investigated sulfur sources,thioacetamide provided the highest visible-light absorption ability for Cd S/Mo S_2,with the smallest average particle size and largest surface area,resulting in the highest efficiency in Methylene Blue(MB)degradation.The photocatalytic activity of Cd S/Mo S_2synthesized from the three sulfur sources can be arranged in the following order:thioacetamideL-cysteinethiourea.The reaction rate constants(k)for thioacetamide,L-cysteine,and thiourea were estimated to be 0.0197,0.0140,and 0.0084 min~(-1),respectively.However,thioacetamide may be limited in practical application in terms of its price and toxicity,while L-cysteine is relatively economical,less toxic and exhibited good photocatalytic degradation performance toward MB. 相似文献
97.
采用一步水热法与两步水热法制备了GQDs/Bi2WO6(GQDs为石墨烯量子点)复合材料,利用氙灯为光源,考察了暗反应与光反应条件下GQDs/Bi2WO6对目标污染物环丙沙星的吸附性能与光催化性能,并对所制备的部分材料进行了表征。实验结果表明,相比于纯Bi2WO6,一步法制备的0.20GQDs/Bi2WO6(柠檬酸CA与 Bi2WO6物质的量比为0.2)和两步法制备的2%GQDs/Bi2WO6(GQDs与Bi2WO6的质量比为2%)有着相对更好的吸附性能与光催化性能。其中,0.20GQDs/Bi2WO6光催化效果最好。暗反应30 min后,环丙沙星吸附去除率为50.4%。光反应60 min后,环丙沙星的光催化去除率为42.6个百分点,总去除率达93.0%。表征结果显示,0.20GQDs/Bi2WO6的比表面积最大,且光生空穴和电子复合概率也相对较低。 相似文献
98.
采用一步水热法,以TiCl_4,H_2O_2,KBF4为原料,制备了TiO_2中空微球。采用SEM和XRD技术对TiO_2中空微球的形貌和结构进行了表征。以罗丹明B为模拟降解物,研究了TiO_2中空微球的光催化降解活性;并对TiO_2中空微球的生长机制进行了探讨。表征结果显示,制得的TiO_2中空微球呈锐钛矿型,颗粒分散均匀,外径约为3μm。实验结果表明,在紫外光照射下,加入1 g/L的TiO_2中空微球,处理初始质量浓度为20 mg/L、溶液p H为7的罗丹明B溶液,降解时间为120 min时,罗丹明B降解率可达93.38%。 相似文献
99.
以乙二胺和抗坏血酸为原料,通过一步水热法制备了水溶性的氮掺杂碳量子点(N-CQDs).研究了N-CQDs的形貌特征、光学性能和应用分析.表征结果说明,N-CQDs形态为均匀分散的球形,有明显的晶格条纹,抗光漂白性能良好,表面富有含氧官能团,具有良好的水溶性.此外发现N-CQDs还具有优良的荧光性能和荧光稳定性,量子产率可以高达12.29%.分析得出,Hg2+对N-CQDs在1.0—120μmol·L-1范围内有一定的猝灭效应,可作为Hg2+的荧光探针,检出限达230 nmol·L-1. 相似文献
100.