Results 51 to 60 of about 18,362 (168)

Research on heavy metal removal from wastewater by DTC with different structure(不同结构DTC用于重金属废水处理试验研究)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2014
分别以链形二胺和环形二胺为原料合成了2种不同结构的DTC(二硫代氨基甲酸盐)DTC-1和DTC-2,采用红外光谱对其结构进行了表征,并用于废水中Cu2+,Ni2+,Zn2+,Cr3+重金属离子或络合态重金属离子的去除. 研究结果表明,原料中胺的结构对捕集效果的影响较大,DTC-1捕集重金属的能力顺序为Cu2+>Ni2+>Cr3+>Zn2+,对Zn2+几乎没有去除效果,而DTC-2捕集4种重金属的能力顺序为Cu2+>Ni2+>Zn2+>Cr3+,对常见的4种游离态的重金属离子均有理想的捕集效果;DTC ...
LAIShuixiu(赖水秀)   +3 more
doaj   +1 more source

Adsorption of Selemiun and Cr(VI) and rapid detection of Cr(VI) in aqueous solution using composite materials based on fuctionalizing bentonite [PDF]

open access: yes, 2015
随着工业化程度的不断提高,环境中重金属污染日益严重。由于重金属不可生物降解的特性,在水体中富集就造成水域环境污染;通过食物链在人体中富集,则危及人类身体健康。硒是人体必需的微量元素,适量硒具有增强机体免疫功能,抗氧化和防癌作用。但是,摄人过高或过低的硒元素均会对人体健康造成危害,反而具有致突变和癌变作用。水体中的硒元素污染主要由于人类对矿物的过度开采以及一些工业生产部门的废水乱排造成的。水域中重金属铬污染主要来源于铬矿的采选矿、造纸、印刷、冶炼电镀、染料、机器制造、制药等工业部门排出的废水。其中 ...
黄丽
core  

On the Damage Tolerance of Diffusion Bonded Titanium–Aluminum Phase Biomimetic Composites

open access: yesRare Metals, EarlyView.
ABSTRACT The biomimetic design principles of natural structures involve the strategic integration of stiff and compliant phases to synergistically enhance strength and toughness. Its evolutionary refined natural armor, characterized by a specialized microarchitecture, enables superior damage tolerance.
Shuai Tong   +10 more
wiley   +1 more source

三峡库区耕地重金属分布特征初步研究

open access: yesShuitu Baochi Xuebao, 2003
通过对三峡重庆库区16个市、县(区)旱地和水田土样分析、统计、评价,研究了库区耕地土壤主要重金属元素分布特征。结果表明,库区耕地土壤有不同程度污染,重金属As、Cd、Cu、Ni的含量均有超标,Cd有最大超标;旱地土壤重金属含量略高于水田,紫色土略高于黄壤,各采样点重金属含量差异大;重金属元素Cd、Pb、Cu、As、Zn间存在极显著正相关,土壤污染有复合污染趋势;主要淹水区县土壤环境质量评价结果显示,仅巫山县污染综合指数评价为中污染,主城区、开县为轻微污染,涪陵区、长寿区、奉节县为警戒级,其余为安全级 ...
许书军 魏世强 谢德体
doaj  

Optimizing the Surface Coordination of Pd‐Cu Nanoalloy Through Chemical Ordering to Enhance Hydrogenation Selectivity

open access: yesRare Metals, EarlyView.
ABSTRACT Precise control of chemical ordering in bimetallic nanocatalysts offers a route to decouple activity and selectivity in acetylene hydrogenation, but direct atomic‐scale evidence linking surface order to catalytic performance is scarce. Here, we tune Pd‐Cu nanoalloys from chemically disordered to highly ordered states by composition control and
Fan Xue   +5 more
wiley   +1 more source

BCR法在污染农田黑土重金属形态分布研究中的应用

open access: yesShuitu Baochi Xuebao, 2006
通过对东北地区污染农田黑土剖面的取样调查分析,对重金属Cd、Ph、Cu、Zn在农田黑土中的污染状况及其迁移特征进行了对比研究,并就BCR(the Community Bureau of Reference)连续提取法在农田土壤重金属污染评估中的应用进行了探讨。结果表明,重金属的迁移率大小依次为:Cd〉Cu〉Pb〉Zn,Cd的酸可溶态占全量的比率高于其它重金属。Pb的酸可提取态浓度随土壤深度增加而增大,公路附近土壤中PL、Cu及城市郊区土壤中Cd、Pb和Zn的氧化物结合态含量均随土壤深度的增加而升高 ...
曹会聪, 王金达, 张学林
doaj  

Influence of Root Secretion Flavonoids on the Biogeochemistry Behavior of Cadmium in Avicennia marina (Forsk.) Vierh Rhizosphere [PDF]

open access: yes, 2015
红树林生态系统主要分布于热带和亚热带的海岸潮间带,其具有独特的生态学和生物学特性,为污染物的吸附治理提供了最佳场所。然而,近年来,随着工业化、城市化和地区经济的快速发展,导致大量生活污水和工业废水流向红树林湿地,使得红树林生态系统面临越来越严重的重金属污染,从而使得滨海湿地面临着日益严峻的重金属污染。进入红树林湿地的污染物最先在红树植物根际区进行一系列形态转化等过程,而后被植物吸收累积。因此,红树林根际区重金属化学行为已经成为近年来污染生态学的研究热点。 类黄酮是植物体内广泛存在的一类重要次生代谢产物 ...
李健
core  

Bottom‐Up Strategy Toward 3D Porous MXene/MoS2 Nanosheets/Graphene Nanoarchitectures as Highly‐Efficient Hydrogen Evolution Electrocatalysts

open access: yesRare Metals, EarlyView.
ABSTRACT As a core component in the electrochemical water splitting system, the cathode catalyst is capable of boosting the kinetics of the hydrogen evolution reaction (HER), while the scarcity and expenditure of current noble metal‐based electrocatalysts seriously restrict the large‐scale commercial development of hydrogen manufacturing devices. Here,
Haiyan He   +8 more
wiley   +1 more source

污染紫色土重金属的淋溶特征及释放动力学研究

open access: yesShuitu Baochi Xuebao, 2011
通过室内土柱试验,探讨雨水作用下紫色土中Cu、Pb和Cd等重金属元素的淋溶和释放特征。结果表明,在淋溶量为6 000 ml的模拟降雨作用下,淋溶量2 000 ml内是紫色土中重金属快速释放时期,在这个期间,淋溶液内重金属浓度较高,释放速度不断减小,是快速释放过程,对环境及地下水威胁较大;2 000ml后,淋溶液内重金属浓度很低,累计释放量变化不大。整个淋溶过程中,3种重金属释放率的顺序为:Cd>Cu>Pb。模拟降雨条件下污染紫色土重金属的释放过程可用修正的Elovich方程和双常数方程进行拟合 ...
郑顺安   +3 more
doaj  

[A case of skin ulcers secondary to extensive burns caused by flame and heavy metal-containing hydrothermal fluids]. [PDF]

open access: yesZhonghua Shao Shang Yu Chuang Mian Xiu Fu Za Zhi, 2023
Dong HF, Huang X, Wu JY, Li XH.
europepmc   +1 more source

Home - About - Disclaimer - Privacy