基于铁氧化物的表面Fe(Ⅱ)对地下环境中硝基苯的衰减作用

通过静态实验研究了基于铁氧化物表面Fe(Ⅱ)对地下环境中硝基苯的衰减作用.结果表明,在硝基苯浓度为150mg.L-1,Fe(Ⅱ)与硝基苯物质的量比为13.5时,反应60h内,离子态的Fe(Ⅱ)、Fe(Ⅱ)-正方针铁矿、Fe(Ⅱ)-赤铁矿、Fe(Ⅱ)-针铁矿对硝基苯的衰减属于一级反应动力学;Fe(Ⅱ)-正方针铁矿和Fe(Ⅱ)-针铁矿对硝基苯的衰减效果相近,且均比Fe(Ⅱ)-赤铁矿对硝基苯的衰减效果好;Fe(Ⅱ)与硝基苯的物质的量比对硝基苯的衰减也有一定的影响,在硝基苯浓度为150mg.L-1,Fe(Ⅱ)与硝基苯物质的量比为13.5时,对硝基苯的衰减效果相对较好,对硝基苯的去除率均在25.18%以上.     

铁氧化菌特性及其在环境污染治理中的应用

铁氧化细菌属于化能无机营养型,常见的有嘉氏铁细菌属,氧化亚铁硫杆菌。氧化亚铁以及各种还原性硫化物为铁氧化菌提供生命活动能量。其主要碳源是二氧化碳,氮源为NH4+。由于氧化亚铁硫杆菌在矿物的附着选择在硫化物相,这些点位的化学键弱,能量易被细菌利用,根据文献发现铁氧化菌的作用机理为直接和间接机理的复合作用。一般来说在水土环境中主要受pH,温度等的影响。目前主要用于城市用水净化、含有重金属离子的各种废水处理及脱硫中,并且已经取得良好的处理效果。     

铬污染土壤的微生物修复

采用淋溶实验研究微生物对铬污染土壤中Cr(Ⅵ)的修复,研究培养基成分、培养基添加量及淋溶液pH值对修复效果的影响.结果表明,培养基淋溶能完全修复铬污染土壤中水溶性Cr(Ⅵ),浸出液中Cr(Ⅵ)浓度由初始的700.3mg·L-1降低至检出限以下.单独加入碳源作为培养基时,土壤中Cr(Ⅵ)不能得到完全修复,碳源与氮源结合作...     

三苯基锡和五氯酚胁迫斑马鱼生理生化的影响

以斑马鱼(Brachy danio rerio)作为受试生物,分析不同暴露浓度、不同暴露时间三苯基锡(TPT)、五氯酚(PCP)对斑马鱼生理生化指标的影响,在0,1.05,2.09,4.18,6.27,8.36μg·L-1的TPT和0,5.01,10.02,20.04,40.08,80.16μg·L-1的PCP暴露下,...     

全国机动车氮氧化物总量减排——《2013年中国机动车污染防治年报》（第Ⅵ部分）

环境保护部目前发布《2013年中国机动车污染防治年报》,公布了2012年全国机动车污染排放状况。本期“研究成果展示”专栏以六篇形式连载。本文刊载关于全国机动车氮氧化物总量减排的内容,以飨读者。     

Econometric analysis of the impacts of climate change on the livestock production in Qinghai Province

This study aims to investigate the effect of the impact mechanism of climate change on the livestock production at small watershed level and county level with the Multi-level Model(MLM)in Qinghai Province.The result indicated that the gross livestock output value was greatly influenced by the climatic factors of the small watershed level.Higher temperature promoted also by the increase of precipitation,relative humidity and sunshine duration was found to be beneficial to the development of livestock production,except in some areas where temperature rise restrained the development of local livestock production to some degree when exceeding a certain level;besides,the impact of the socioeconomic factors on the livestock output value is obvious at the county level.The gross economic output measured with GDP has some inhibitory effects on the reinvestment of livestock production,while population growth promotes development of livestock production to some degree.The results not only provide scientific basis for the management of livestock production in Qinghai Province,but also provide reference for formulating the policies and adaptation measures targeted at climate change to promote the sustainable development of livestock production in other regions.     

棱形十二面体Ag_3PO_4微晶的辅助合成及其可见光催化性能

以六次甲基四胺(HMTA)和聚乙烯吡咯烷酮(PVP)为混合辅助剂,采用沉淀法合成了立方晶相棱形十二面体Ag3PO4微晶,对其进行了表征,并通过降解罗丹明B考察了其可见光催化活性。实验结果表明:以0.10g(25 g/mol(以Ag NO3计))HMTA和0.10 g PVP为混合辅助剂合成的棱形十二面体Ag3PO4微晶,其禁带宽度为2.17e V,对罗丹明B有较好的可见光催化活性;在8 mg/L罗丹明B溶液中加入0.4 g/L Ag3PO4,可见光照射12 min时,未添加辅助剂以及分别添加0.10 g PVP、0.10 g HMTA、0.10 g HMTA和0.10 g PVP混合辅助剂制备的Ag3PO4对罗丹明B的降解率分别为67.59%,76.25%,91.88%,99.64%;棱形十二面体Ag3PO4微晶重复使用4次后,罗丹明B的降解率仍达91.59%,说明该光催化剂具有较好的重复使用性能。     

Can environmental regulations break down domestic market segmentation? Evidence from China

Environmental Science and Pollution Research - While local protectionism and market segmentation owing to fiscal decentralization are not conducive to broad economic development, they may be...     

Uncertainty health risk assessment and regional control of drinking water: a case study of Hanyuan County,southwest mountainous area,China

Environmental Science and Pollution Research - To evaluate the health risks of drinking water in Hanyuan County, 96 samples of peripheral drinking water were collected from 30 sites in the area....