Results 121 to 130 of about 614 (250)
Gongye shui chuli, 2017 研究了粉末活性炭（PAC）吸附去除水溶液中的Cr（Ⅵ），利用基于单因素实验的响应面法优化了Cr（Ⅵ）的去除条件。结果表明，模型能很好地拟合实验数据。当Cr（Ⅵ）初始质量浓度为50 mg/L时，由响应面法得到的Cr（Ⅵ）最佳去除条件是：pH=3、吸附时间为21.56 min、PAC投加质量浓度为2.40 g/L，相应的Cr（Ⅵ）的去除率为86.00%。实验值和预测值的相对偏差仅为1.07%，证实模型合理可行。
王文强, 王爱丽
doaj
Informations of Cr Plating in Trivalent Chromium Electrolytes [PDF]
, 2009 Cr(Ⅵ)对环境和人体健康有严重的危害,因此,促进了三价铬镀铬研究的发展。三价铬镀铬与Cr(Ⅵ)镀铬相比,具有很多优点。但是,三价铬镀铬要广泛应用,仍需要解决一些问题如镀液成分复杂、工艺难以维护和控制、阳极选择困难、镀层难以增厚及镀层色泽不够理想等。简要回顾了三价铬镀铬的发展历程,介绍了目前三价铬镀铬存在的问题,并着重论述了解决问题的途径和未来的发展方向。Traditional chromium electroplating is carried out in a plating bath ...
周绍民 +3 more
core
Additive Gaussian Process Regression for Predictive Design of High‐Performance, Printable Silicones
Advanced Engineering Materials, EarlyView.A chemistry‐aware design framework for tuning printable polydimethylsiloxane (PDMS) for vat photopolymerization (VPP) is developed using additive Gaussian process (GP) modeling. Polymer network mechanics informs variable groupings, feasible formulation constraints, and interaction variables.
Roxana Carbonell +3 more
wiley +1 more source
分光光度法同时测定水中Cr(Ⅵ)、Cr(Ⅲ)和总铬的条件优化
Gongye shui chuli, 2007 实验中用过硫酸铵代替高锰酸钾将Cr(Ⅲ)氧化成Cr(Ⅵ),再与二苯碳酰二肼(DPCI)进行显色反应。利用Cr(Ⅵ)与DPCI的显色反应及可见光谱法建立了同时测定水样中痕量Cr(Ⅵ)和Cr(Ⅲ)的方法。用此方法对含有Cr(Ⅲ)和Cr(Ⅵ)的混合水样进行测定,分析效果良好。对影响各反应的条件及检测条件进行了优化研究,建立了快速、简便、可靠地测定水样中铬含量的方法。
乐华斌, 罗廉明, 刘善新
doaj
Comprehensive model development based on Dempster-Shafer evidence theory for pollution source analysis in chemical parks. [PDF]
Heliyon, 2023 Bai X, Yang Y, Tian X, Wen P, Ma Z.
europepmc +1 more source
Advanced Engineering Materials, EarlyView.Geometry‐driven thermal behavior in wire‐arc additive manufacturing (WAAM) influences microstructural evolution during nonequilibrium solidification of a chemically complex Fe–Cr–Nb–W–Mo–C nanocomposite system. By comparing different deposits configurations, distinct entropy–cooling rate correlations, segregation, and carbide evolution are revealed ...
Blanca Palacios +5 more
wiley +1 more source
Study on the removal of Cr(Ⅵ) by acid-modified distillers’ grains biochar
Gongye shui chuliThe acid modified biochar (H-BC) was prepared with distillers’ grains, which was activated by KHCO3 and modified by dipping in acid solution. By optimizing the preparation parameters of H-BC (pyrolysis temperature, activator ratio, type and concentration
TANG Hengjun +3 more
doaj +1 more source
, 2011 通过渗透沉积过程合成单分散的磁性聚甲基丙烯酸缩水甘油酯(PGMA-NH2)高分子微球,对其进行了SEM,FT-IR,XRD表征.并着重研究了磁性PGMA-NH2高分子微球对Cr(Ⅵ)的吸附性能及吸附机理.结果表明,此磁性高分子微球对Cr(Ⅵ)有较高的吸附量,等温吸附数据符合Langmuir模型,在温度298.15K,pH=4.5时,吸附剂的饱和吸附容量为263.16mg/g.吸附量与废水中Cr(Ⅵ)的离子形式有关,pH=1.5时吸附效果最好,在15min内达到平衡.吸附以离子交换与静电引力为主,自发进行,
孔鹏 +7 more
core
Effects of Bap and Cr(Ⅵ)on the Growth and Ecophysiology of Mangrove Kandelia candel Seedlings [PDF]
, 2008 在玻璃温室、自然透光下采用人工砂基栽培，研究Bap、Cr和二者的复合污染在不同浓度梯度和不同胁迫时间下，对红树植物秋茄（Kandeliacandel）幼苗的生长及生理生态效应的影响。设置Bap的系列胁迫浓度为100、200、300、400、800µg·L-1，以不加Bap为对照；Cr6+的系列胁迫浓度为0.5、2.5、5、10、25、50、100mg·L-1，以不加Cr6+为对照；Bap和Cr的复合胁迫浓度为100、200、300µg·L-1Bap分别与5、10、25mg·L ...
王铮敏
core
Advanced Engineering Materials, EarlyView.Thermomechanical fatigue tests of laser beam powder bed fusion (PBF‐LB) Inconel 718 show that the additively manufactured material reaches almost the lifetimes of conventionally‐rolled material under no‐dwell conditions. Introducing dwell times at the maximum temperature markedly reduces the lifetimes due to pronounced grain boundary sliding associated
Stefan Guth +6 more
wiley +1 more source