Mg—Al水滑石对偶氮染料活性艳红X-3B的脱色性能研究

采用共沉淀法合成出一系列镁铝摩尔比不同的碳酸根型水滑石（LDHs）,经500℃高温煅烧制备出镁铝复合氧化物CLDH,并用X-射线、红外光谱对它们进行表征。考查了吸附剂投加量、反应时间、初始pH值等因素对LDHs和CLDH处理阴离子染料活性艳红X-3B模拟废水效果的影响,并对吸附机理进行探讨。实验结果表明：以镁铝摩尔比为3：1时制得的水滑石对活性艳红X-3B溶液的脱色效果最好。水滑石LDHs及其焙烧产物CLDH对活性艳红X-3B染料均具有较好的吸附性能,最佳反应时间分别为60min和30min;在较宽的pH范围内二者的脱色性能稳定,且CLDH对该染料的吸附效果要优于LDHs。LDHs及CLDH对活性艳红X-3B的吸附结果符合Langmuir吸附等温式,25℃下饱和吸附量分别为263．77mg／g和875．23mg／g。LDHs及CLDH的吸附机理分别为离子交换和层状结构重建。饱和吸附后的CLDH用高温热解法再生,吸附性能良好,随再生次数增多,脱色率下降。     

氮磷钾和乙二胺四乙酸对镉污染三叶鬼针草的吸收特征研究

超富集植物的筛选是植物修复重金属污染土壤技术的核心内容.采用盆栽试验的方法,研究了Cd胁迫下添加营养元素N、P、K和螯合剂乙二胺四乙酸(EDTA)对三叶鬼针草(Bidens pilosa L.)的生长反应和生理生化特性以及对Cd的吸收积累特征.盆栽试验结果显示,在Cd为10 mg/kg时,添加营养元素N、P、K和EDT...     

麻质活性炭的制备及其对Cu2＋的吸附研究

以废麻为原料,KOH为活化剂制备粉状活性炭,通过静态吸附实验研究了活性炭对Cu2＋的吸附性能,探讨了溶液起始pH值、活性炭投加量、吸附时间、起始Cu2＋质量浓度等对Cu2＋吸附效果的影响。结果表明,溶液pH和活性炭投加量对吸附效果有较大影响,活性炭对Cu2＋的吸附率在60 min内超过50%,初始浓度在10~50 mg/L时,活性炭对Cu2＋的吸附量与起始浓度近似成正比。采用Langmuir、Freundlich吸附等温式对吸附平衡数据进行了拟合,结果表明吸附等温线符合Frenudlich模型。采用傅立叶红外光谱法（FT-IR）分析了活性炭的表面官能团,分析表明活性炭表面酸性官能团可能是吸附Cu2＋的活性中心。     

企业安全管理中的重要环节-安全检查

安全检查是安全系统管理中最常用,也是最直观的方法之一,在传统管理和现代管理中都是不可缺少的.近年来,随着安全检查工作的广泛深入开展,出现了应用上的很多问题,如安全检查方法较单一、安全检查过于频繁而缺少针对性的专项检查、安全检查表不完整且操作性差、安全检查人员水平参差不齐、安全检查追踪制度不完善等.     

当前社会实行生态管理的探讨

生态管理作为一种管理理念日益受到关注,生态管理以人为本,以提升人的生活品质、促进人类与社会、自然界的共同进步为终极目标,不仅是实现可持续发展的重要途径,而且对构建和谐社会也有重大意义。     

气升式内循环蜂窝陶瓷反应器高效快速修复地表水的研究

采用新型蜂窝陶瓷载体气升式内循环反应器(IAL-CHS)对受污染的城市地表水进行生物修复,该反应器能快速有效地修复受污染水体.考查了氨氮的变化历程、HRT与氨氮去除率间的关系,确定了最佳HRT为20 min.在HRT为20 min、接触反应时间仅为14 min条件下,该反应器对氨氮、TP、COD、TOC、浊度、UV254的去除率分别为86.7%～96.2%、4.5%～34.4%、15.5%～63.6%、5.8%～38.1%、9.4%～88.3%、3.8%～48.5%.     

Enhanced bioaccumulation of cadmium in carp in the presence of titanium dioxide nanoparticles

In this study adsorption of Cd onto TiO2 nanoparticles and natural sediment particles (SP) were studied and the facilitated transports of Cd into carp by TiO2 nanoparticles and SP were assessed by bioaccumulation tests exposing carp (Cyprinus carpio) to Cd contaminated water in the presence of TiO2 and SP respectively. The results show that TiO2 nanoparticles had a significantly stronger adsorption capacity for Cd than SP. The presence of SP did not have significant influence on the accumulation of Cd in carp during the 25 d of exposure. However, the presence of TiO2 nanoparticles greatly enhanced the accumulation of Cd in carp. After 25 d of exposure Cd concentration in carp increased by 146%, and the value was 22.3 and 9.07 microg/g, respectively. And there is a positive correlation between Cd and TiO2 concentration. Considerable Cd and TiO2 accumulated in viscera and gills of the fish.     

Experimental study on biomass advanced reburning for nitrogen oxides reduction

Advanced reburning (AR) is effective for nitrogen oxides (NO_x) reduction, which integrates the basic reburning (BR) with the injection of nitrogen agents and additive compounds. The basic reburning of poplar, cornstalk, wheat-straw and peanut shell, is studied on a boiler simulator facility (BSF). The influence of operating parameters and the synergistic effect of the injection of ammonia, urea or/and sodium carbonate on NO_x reduction are investigated. The results show that an efficiency of 54–67% NO_x reduction could be achieved during the basic reburning process under the optimum operating conditions and the efficiency would be increased if nitrogen agent is injected with the over-fire air or into the burnout zone. Further, co-injection of sodium carbonate with the nitrogen agent could make the NO_x reduction process more thorough. On the whole, 85–92% NO_x reduction could be achieved during the advanced reburning process with a reburning fuel heat input of 15–20%.     

促进我国企业实现清洁生产的途径

根据最新文献，对我国企业的现状，促进我国企业实现清洁生产的可能途径进行述评，认为应该针对我国不同行业、不同企业的实际情况，有所侧重地通过各种途径的共同作用，促进我国企业实现清洁生产。