检索结果-南通市图书馆

Ligand-mediated contaminant degradation by bare and carboxymethyl cellulose-coated bimetallic palladium-zero valent iron nanoparticles in high salinity environments

引用

Journal of Environmental Sciences 2019年第3期31卷 303-311页

作者： Xiaoming Ma Di He Adele M.Jones T.David Waite Taicheng An Institute of Environmental Health and Pollution Control Guangdong University of Technology Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control School of Environmental Science and Engineering Guangzhou University of Technology School of Civil and Environmental Engineering University of New South Wales

The application of nanoscale zero-valent iron(nZVI) for the degradation of contaminants has been extensively investigated, however, few studies have focused on degradation in high salinity environments. In this study, the ability of bare and carboxymethyl cellulose(CMC)-coated bimetallic Pd-nZVI particles to degrade 33′44′-tetrachlorobiphenyl in high saline water(SW) is examined with particular attention given to the effects of ethylenediaminetetraacetic acid(EDTA) on the rate of degradation. EDTA enhances the reactivity of Pd-nZVI in SW, with evidence provided to link this to the removal of the passivating layer. Additionally, a conceptual model is proposed which provides a quantitative description of the removal of these iron oxide layers in the presence of EDTA. An optimum EDTA to bare Pd-nZVI molar ratio of 0.1 exists, with insufficient EDTA unable to remove the passivating layer whilst excess EDTA results in Fe loss and enhanced agglomeration due to magnetic attraction of the bare Fe(0) particles. In contrast, CMCcoating of Pd-nZVI assemblages actually impedes degradation, despite the coated particles displaying a smaller average size compared to uncoated particles, with even the presence of EDTA in this case not significantly improving degradation. The reduced reactivity in the presence of CMC is primarily attributed to the effect of CMC on the association of Pd with nZVI particles. In particular, the presence of CMC reduced the total amount of Pd incorporated with the stabilized particles compared to the non-stabilized ***, the presence of CMC results in less Pd present in its reactive zero-valent oxidation state.

关键词： Bimetallic zero valent iron ligand-mediated depassivation polychlorinated biphenyls high salinity water

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Rapid decolorization of water soluble azo-dyes by nanosized zero-valent iron immobilized on the exchange resin

引用

Science China Chemistry 2008年第2期51卷 186-192页

作者： ZHAO ZongShan LIU JingFu TAI Chao ZHOU QunFang HU JingTian JIANG GuiBin Key Laboratory of Environmental Chemistry and Ecotoxicology Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China Department of Chemistry Shandong UniversityJinan 250100China

Nanosized zero-valent iron (NZVI) supported on the cation exchange resin was synthesized and applied to decompose some water soluble azo dyes. The decomposition efficiency for azo dyes was evaluated by using the aqueous suspensions and parked column of this material. Batch experiments indicated that this novel material exhibited excellent degradation ability for 0.05 g·L1 of Acid Orange 7, Acid Orange 8, Acid Orange 10, Sunset Yellow, and Methyl Orange, with decolorization ratio up to 95% in 4 min; pH value was the key factor for degradation and H+ was one of the reactants; adsorption of azo dyes onto the material existed at the beginning but reduced gradually until disappearing completely. For the packed column system, 58%~90% of azo dyes were decomposed in the 1st circle of solution passing through the column, and the adsorption onto the materials could accelerate the degradation azo dyes with the increasing reaction time. During the degradation process, Fe2+, the product of NZVI, was exchanged to the resin again and could be reduced to Fe0 by KBH4 for reusing. The 10th refreshed NZVI possessed reductive activity up to 90% of the newly systhesized NZVI. Decomposing pollutants in the aqueous solution with columns packed with NZVI immobilized on the cation exchange resin is a promising technology that can solve the reclaiming and refreshing problem of NZVI.

关键词： azo-dye nanosized-zero valent iron (NZVI) decomposition packing column

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Reply to comment on“Long-term performance evaluation of zero-valent iron amended permeable reactive barriers for groundwater remediation–A mechanistic approach” by C. Noubactep, Geoscience Frontiers 14(2023), 101582

引用

Geoscience Frontiers 2023年第4期14卷 282-284页

作者： Michael Lawrinenko Sudarshan Kurwadkar Richard T.Wilkin Center for Environmental Solutions and Emergency Response U.S.Environmental Protection Agency919 Kerr Research DriveAdaOklahoma 74820USA Department of Civil and Environmental Engineering California State University800 N.State College Blvd.FullertonCA 92831USA

We welcome the opportunity to address comments provided by *** and to further emphasize the concepts developed in our article titled“Long–term performance evaluation of zero-valent iron amended permeable reactive ba... 详细信息

关键词： groundwater performance valent

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

ON　THE　CLASS　φ_p~＊（α，β，γ，ε，η；A）　of　p－valent　FUNCTIONS　WITHREFERENCE　TO　THEBERNARDI　INTEGRAL　OPERATOR

引用

Acta Mathematica Scientia 1994年第4期14卷 371-376页

作者：蹇明

Bernardi has proved that if f(z) is starlike univalent in the unit disk △, then so is the func-tion g(z) given byIn this paper, we extend Bernardi's theorem to certain class φp (α,β,γ,ε,η; A) of p- valent starlike functions for operators. We prove that if f(A) e φp (α, β,γ, ε, η; A), then g(A), defined byalso belongs to φp (α, β, γ, ε, η; A) and give a sufficient and necessary vondition with reference to f(A) 6 γp (α,β,γ,ε,η;A)

关键词： CLASS OPERATOR THEBERNARDI ON FUNCTIONS INTEGRAL valent WITHREFERENCE of

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Remediation of Malathion Contaminated Soil Using Zero valent Iron Nano-Particles

引用

American Journal of Analytical Chemistry 2012年第1期3卷 76-82页

作者： R. K. Singhal B. Gangadhar H. Basu V. Manisha G.R. K. Naidu A.V. R. Reddy 不详

In this study, iron nano-particles were used to remediate malathion contaminated soil in the concentration range of 1 - 10 μg?g–1. The zero valent iron nano-particles were prepared by reducing ferric chloride solution with sodium boro- hydride for remediation of the soil. The optimized quantity of iron nano particles was found to be 0.1 g?kg–1 of soil con- taminated with 10 μg?g–1 of malathion. Malathion was determined in the soil after leaching to water at pH 8.2 and fol- lowed by its oxidation with slight excess of N-bromosuccinimide (NBS). The unconsumed NBS was estimated by measuring the decrease in the color intensity of rhodamine B. Degradation product formed during the oxidation of ma-lathion by zero valent iron was monitored by the Attenuated Total Reflectance Fourier Transform Infrared Spectros- copy (ATR-FTIR). The results clearly showed that quantitative oxidation of malathion was achieved within eight min- utes after the addition of zero valent iron nano particles.

关键词： Malathion Zero valent Iron Nano Particle Soil Contamination

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Evaluating Effectiveness and Permanence of Selenium Treatment in a Solid Matrix via Aqueous-Mediated Zero valent Iron Reaction

引用

Journal of Environmental Protection 2017年第9期8卷 990-1001页

作者： Scott A. Grieco Danielle C. Singer Gary R. Bement O’Brien & Gere Engineers Inc. Syracuse New York USA

Increasingly, as regulatory limits become more stringent, selenium has become a parameter of concern. Selenium is a naturally occurring element that is largely mobilized by anthropogenic activity such as mining for fuel and subsequent combustion, metal ore refining and processing, and agricultural irrigation. Of concern is removing selenium liquid matrices and immobilizing it from leachable solid matrices. Chemical reduction and stabilization using zero valent iron (ZVI) is applicable to both concerns. The solid matrix case study is applicable to ash ponds solids or industrial bag house dust solids. This paper presents data for treatment and stabilization of selenium within a solid matrix using ZVI. The methodology uses an aqueous mediate reaction to promote a stable solid matrix of non-leachable selenium. The paper describes matrix challenges and key variables that effected successful treatment. Testing with simulated and real bag house dust solids were used to establish data to support the permeance of the reaction. The data show that ZVI converts ionic selenium to a zero valent state in the solid matrix. It was also recognized that a fraction of ionic selenium may fail to react with the ZVI, but the results show that despite the presence of the unreacted ionic selenium, the toxicity characteristic leachate procedure (TCLP) results following treatment do not exceed the 1 mg/L hazardous waste criteria.

关键词： Bag House Dust Selenium Chemical Reduction Land Disposal Restrictions Toxicity Characteristic Leaching Procedure TCLP Zero valent Iron

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Incorporation of zero valent iron into pelletized surfactant-modified zeolite as permeable barriers for groundwater remediation

引用

Global Geology 1998年第1期3卷 40-41页

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

HIGH-valent MANGANESE PORPHY-RIN COMPLEX-Ⅰ——SYNTHESIS OF Bis(IODOSYLBENZENE)TETRAPHENYLPOR-PHINATO MANGANESE(Ⅳ)

引用

Chinese Science Bulletin 1987年第3期32卷 176-179页

作者：金日镇高桂芬万晓宝 Changchun Institute of Applied Chemistry Academia Sinica Changchun Institute of Applied Chemistry Academia Sinica? INTRODUCTION It is known that high-valent manganese complexes are crucial for oxygen evolution in photosynthetic processes and can selectively oxidize hydrocarbons under mild conditions. Thus recently chemists are very much interested in synthesis of high-valent manganese

Ⅰ. INTRODUCTION It is known that high-valent manganese complexes are crucial for oxygen evolution in photosynthetic processes and can selectively oxidize hydrocarbons under mild conditions. Thus, recently chemists ar... 详细信息

关键词： valent manganese interested photosynthetic hydrocarbons brown complexes dried visible spectrometer

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Water decontamination by reactive high-valent iron species

引用

Eco-Environment & Health 2024年第1期3卷 55-58页

作者： Yunhui Zhang Logan Swaren Wenbing Wang College of Environmental Science and Engineering Tongji UniversityShanghai 200092China Key Laboratory of Yangtze River Water Environment Ministry of EducationTongji UniversityShanghai 200092China Shanghai Institute of Pollution Control and Ecological Security Shanghai 200092China Department of Earth and Atmospheric Sciences University of AlbertaEdmontonAlberta T6G 2E3Canada School of Environmental and Chemical Engineering Shanghai UniversityShanghai 200444China

The occurrence of emerging organic contaminants(EOCs)in water bodies has received increasing attention ***,such as pharmaceuticals and pesticides,when present in trace concentrations,cannot be effectively removed by conventionally designed treatment processes in most wastewater treatment ***,advanced oxidation processes(AOPs)have been developed as promising alternatives for trace-level EOC elimination using radicals(e.g.,hydroxyl radicals and sulfate radicals)and non-radical ***,these reactive species are generally nonselective and also exhibit excellent reactivity with background water constituents,leading to excess consumption of oxidants and the possible generation of toxic secondary pollutants[1].Accordingly,selective oxidants have recently become a subject of considerable interest,mainly including singlet oxygen and high-valent metal species[2].They could preferentially attack electron-rich moieties,resulting in selective degradation of EOCs.

关键词： valent removed elimination

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

valent生物杀虫剂XenTari拟获加拿大批准登记

引用

农药 2015年第6期54卷 421-421页

加拿大有害生物管理局近日建议正式批准登记住友化学分公司valent生物科学的生物杀虫剂原药苏云金芽孢杆菌aizawai亚种菌株ABTS-1857（Bacillu thuringiensis *** strain ABTS-1857）及其终端产品XenTari WG,用于防除多种蔬果、油籽和... 详细信息

加拿大有害生物管理局近日建议正式批准登记住友化学分公司valent生物科学的生物杀虫剂原药苏云金芽孢杆菌aizawai亚种菌株ABTS-1857（Bacillu thuringiensis *** strain ABTS-1857）及其终端产品XenTari WG,用于防除多种蔬果、油籽和景观作物上的鳞翅目幼虫。

关键词：生物杀虫剂 valent XenTari 苏云金芽孢杆菌 ABTS 鳞翅目幼虫生物科学 Subsp 油籽特异受体

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：