高分子凝胶法制备纳米ZnO/La2O3及光催化性能

以Zn(CH3COO)2·2H2O,AgNO3为原料,丙烯酰胺为单体,N,N'-亚甲基双丙烯酰胺为网络剂,采用高分子凝胶法在550℃下制得纳米ZnO/La2O3.通过XRD物相分析,得知沉积稀土氧化物La2O3的ZnO纳米粒子样品的物相均是六方晶系纤锌矿结构;TEM形貌观察,粒子基本为球形,纳米ZnO/La2O3的平均粒径约为26 nm,红外光谱分析高分子的分解程度,在550℃时分解完全.水溶液中次甲基蓝染料在ZnO/La2O3半导体光催化条件下,pH值为9时,能迅速分解,在降解90 min时,次甲基蓝的降解率达到81%.     

高分子网络凝胶法制备纳米ZnO及其光催化性能研究

以Zn(CH3COO)2·2H2O为原料,丙烯酰胺为单体,N,N'—亚甲基双丙烯酰胺为网络剂,采用高分子网络凝胶法在550℃下制得纳米ZnO。通过XRD物相分析,产物为六方晶系;TEM形貌观察,粒子基本为球形,平均粒径为20～30nm;红外光谱分析高分子的分解程度,在通氧的情况下,550℃分解完全。并利用以上三种分析方法,得到单体与网络剂的最佳质量配比为5∶1。水溶液中次甲基蓝染料在ZnO半导体光催化条件下,能迅速分解,在降解3h时,对次甲基蓝的降解率达到85%。     

高分子凝胶网络法制备La0.65Sr0.35MnO3及光催化性能

以Sr(NO3)2,La(NO3)3·6H2O,Mn(NO3)2为原料,丙烯酰胺为单体,N,N'-亚甲基双丙烯酰胺为网络剂,采用高分子网络凝胶法在600 ℃下制得纳米La0.65Sr0.35MnO3.通过XRD物相分析,得知La0.65Sr0.35MnO3粒子样品的物相是立方晶系钙钛矿结构;La0.65Sr0.35MnO3粒子平均粒径为17 nm.水溶液中亚甲基蓝染料在La0.65Sr0.35MnO3太阳光催化条件下,能迅速分解,在降解120 min时,亚甲基蓝的降解率达到92%.     

固相法纳米ZnO/Ag及其光催化性能研究

以Zn(NO3)2.6H2O、AgNO3和Na2CO3为原料,十二烷基苯磺酸钠为分散剂,采用低温固相法在350℃下制得纳米ZnO/Ag。通过XRD物相分析,得知沉积贵金属Ag的ZnO纳米粒子样品的物相均是六方晶系纤锌矿结构;TEM形貌观察,粒子基本为球形,未包覆的ZnO的平均粒径约为20 nm,被Ag包覆的ZnO的平均粒径约为40 nm;在350℃时分解完全。水溶液中次甲基蓝染料在ZnO/Ag半导体光催化条件下,pH为9时,能迅速分解,在降解90 min时,次甲基蓝的降解率达到100%。     

高分子凝胶法制备纳米晶α-Fe2O3

以Fe(NO3)3.9H2O为原料,丙烯酰胺为聚合单体,N,N-亚甲基双丙烯酰胺为网络剂,采用高分子凝胶法制备了纳米α-Fe2O3。采用FT-IR,X-ray和TEM等方法对产物进行了表征。结果表明,单体和网络剂的配比为5∶1时得到均匀稳定的凝胶,当干凝胶在450℃煅烧时,形成纯相的α-Fe2O3,由透射电镜照片可知粒子尺寸分布均匀,平均粒径约为40nm,粒子尺寸在30~45 nm的数量占70%,红外光谱显示有机物煅烧完全,出现明显的铁-氧键的特征吸收峰。     

纳米氧化铜的制备及光催化降解亚甲基蓝

近年来,印染废水造成环境污染的问题日益严重。为处理印染废水,以亚甲基蓝(MB)为目标降解物,采用化学沉淀法制备出了纤维状和球状两种形貌的纳米氧化铜,利用XRD和SEM对样品进行表征。当催化剂投加量0.1 g、初始pH=9、亚甲基蓝初始浓度5 mg/L、质量分数为30%的H₂O₂滴加量1 mL、紫外光下反应75 min时,亚甲基蓝溶液降解率最高,且催化剂循环使用3次后,亚甲基蓝的降解率仍在88%以上,具有优良的稳定性。纳米氧化铜的形貌相同时,晶粒尺寸越小,对亚甲基蓝催化降解效果越好。相同条件下,球状纳米氧化铜催化降解亚甲基蓝的能力强于纤维状纳米氧化铜。     

水解沉淀法制备纳米ZnO及其光催化性能研究

论述了以ZnSO4为主盐NH4HCO3为沉淀剂采用水解沉淀法制备纳米ZnO粉末，用X射线衍射和分光光度法研究了粉料的特征及光催化性能。结果表明：反应温度为80℃，反应时间为2h，煅烧温度为600℃可制备纳米级的ZnO粉末，平均粒径为32nm；水溶液中甲基橙在ZnO光照催化下，能迅速分解，在降解120min时，甲基橙的降解率达到88．1％。     

光催化功能Fe_2O_3/TiO_2陶瓷的制备及其光降解特性

以九水硝酸铁和硫酸钛为原料,利用共沉淀法合成了Fe2O3/TiO2混合粉体,粉体压制成型的素坯经过高温烧结制备Fe2O3/TiO2陶瓷。通过XRD、SEM分析Fe2O3/TiO2多孔陶瓷的物相和微观结构,并通过对甲基蓝溶液(浓度为25mg/L)的降解研究其光催化性能和循环使用性能。结果表明:紫外和可见光条件下,该陶瓷第一次使用时对甲基蓝溶液的最大降解率分别是80%和94%,循环使用三次后,最大降解率分别仅下降16%和17%。所制备的Fe2O3/TiO2陶瓷具有良好的光催化性能和循环使用性能,且利于收集,可以广泛应用于污水处理。     

纳米Fe2O3对甲基橙、亚甲基蓝和罗丹明B的光催化降解研究

以水热法制备的纳米Fe2O3作为光催化剂,在加入H2O2条件下,以高压汞灯为光源,对甲基橙(MO)、亚甲基蓝(MB)和罗丹明B(RhB)等染料进行光催化降解研究.实验表明:在相同光源与相等光强等条件下,当Fe2O3与H2O2的添加量一定时,罗丹明B最易降解,亚甲基蓝次之,而甲基橙的降解最慢,且更易受其他实验条件影响.     

La-Ce共掺杂制备La3+-Ce3+/ZnO及其对亚甲基蓝的光催化降解

采用溶胶凝胶法制备了La-Ce共掺杂的La3+-Ce3+/ZnO光催化剂,同时用同种方法制备了ZnO、La3+/ZnO和Ce3+/ZnO以作对比.通过X射线衍射仪、透射电镜、紫外可见分光光度计,比表面及孔隙度分析仪等对制备的光催化剂进行了表征.以亚甲基蓝为模型污染物对所制备的光催化剂的光催化特性进行了评价.结果表明,所制备的La3+-Ce3+/ZnO光催化剂基本呈长方柱状,尺寸平均为57.3 nm,La-Ce共掺杂提高了ZnO的结晶度,促进了晶粒的长大.根据光催化实验结果,La-Ce共掺杂能够显著提高ZnO的光催化活性.在光催化降解500 mL的10 mg·L-1亚甲基蓝实验中,La3+-Ce3+/ZnO光催化剂对亚甲基蓝的降解率达93.7%,比纯ZnO、La3+-ZnO和Ce3+-ZnO分别提高了21.4%、19.2%和9.3%.      

China's Major Non-ferrous Metals Imports & Exports

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Zinc Production by Province in 2014

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80% of Chinese Firms Purchasing Overseas Mines Ended up in the Red

<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic     

Copper Processing Profit Dropped Sharply,Copper Consumption Will Face Impact in the Second Half of the Year

正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field,     

Central Geological Prospecting Fund Newly Added 16.47 Million Tonnes of Bauxite in 2013

正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF     

Manufacturers of Copper Tube for Central Air Conditioner Use Face Mounting Pressure in the Final Quarter of the Year

正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure     

Xinjiang Ranks No.1 in Production of Primary Aluminum in China

正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year,     

Shenhuo Coal Industry and Electricity Power Completed800,000 t/a Aluminum Project in Xinjiang

正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform.     

Guangdong Metal Transaction Center has Become the Second Largest Precious Metal Transaction Platform Nationwide

正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness.     

Seven Rare Earth Projects Involving Close to 3 Billion Yuan Investment Landed In the HighTech Zone

正On May 22,Baotou Rare Earth Industry Cooperation Consultation MeetingProject Agreement-signing Ceremony was held in Ningbo,nearly 40 enterprises from Ningbo,Guangdong,Hunan,and Shanxi participated in project consultation.After multi-lateral communication,agreements were signed for a total of 7 rare earth projects successfully.