Results 1 to 10 of about 793 (93)

硼、氮掺杂碳纳米管对苯酚废水催化降解的差异

open access: yesGongye shui chuli, 2021
用硼元素和氮元素分别对碳纳米管进行掺杂,将制备的无金属催化剂活化过一硫酸盐(PMS)用于处理苯酚废水。结果表明,氮掺杂碳纳米管活化PMS对苯酚的降解效果略优于硼掺杂碳纳米管的催化效果。当pH为3~11时,氮掺杂碳纳米管的一级动力学常数大约是硼掺杂碳纳米管的2倍。造成两者催化活性差异的原因与缺陷程度、掺杂形式、催化反应过程以及活性物质的种类有关。
梁丹丹, 李兴发, 王朝旭
doaj   +2 more sources

Applications of carbon nanotubes in the solid phase extraction(碳纳米管在固相萃取中的应用)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2015
固相萃取技术(SPE)作为一种分析物提取和样品前处理方法,相比于传统的液液萃取更利于目标分析物的分离,提高痕量分析物的检出能力和被测物的回收率,同时减少对环境的二次污染,且操作过程简单方便,耗时较短.碳纳米管(CNTs)的独特性能使其成为非常有吸引力的SPE吸附材料.介绍了碳纳米管在农残、药品、有机化合物、无机金属离子等检测中的应用,并对碳纳米管在分析领域中的应用前景进行了展望.
CHENBing(陈冰)   +4 more
doaj   +1 more source

Carbon nanotube-supported molybdenum carbide catalysts for the hydrodeoxygenation of maize oil(多壁碳纳米管负载的碳化钼催化剂在玉米油加氢脱氧反应中的应用)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2015
将多壁碳纳米管负载的碳化钼催化剂用于玉米油的加氢脱氧反应以制备柴油类烃,结果表明,该类催化剂对玉米油加氢脱氧反应具有极高的转化率和选择性.结合XRD、Raman、TEM、IR、TG等催化剂表征技术,考察了载体多壁碳纳米管的预处理条件、管径、表面缺陷浓度等因素对催化剂活性和玉米油加氢脱氧反应的影响.在氢压2.5 MPa、反应温度260 ℃、搅拌速率500 r • min-1的实验条件下反应3 h后,玉米油在Mo2C/MWCNT上加氢脱氧制备柴油类烃的反应转化率接近90%,烃类选择性达到了98%.
CAODanyan(曹丹艳)   +3 more
doaj   +1 more source

不同碳基材料对Cr(Ⅵ)的吸附动力学研究

open access: yesGongye shui chuli, 2017
以传统活性炭(木质炭、煤质炭)与碳纳米管为碳基吸附剂,研究不同碳基吸附剂对Cr(Ⅵ)的吸附效果,并对其吸附动力学进行研究。结果表明,传统活性炭对Cr(Ⅵ)的吸附性能优于碳纳米管,木质、煤质活性炭和碳纳米管对Cr(Ⅵ)的理论最大吸附量分别为158.23、152.44、48.69 mg/g;传统活性炭和碳纳米管对Cr(Ⅵ)的吸附过程均符合准二级动力学方程;传统活性炭和碳纳米管对Cr(Ⅵ)的吸附属于物理吸附。
刘航   +5 more
doaj   +2 more sources

Preparation of nano ZSM-5 with hydrophobic surfaces and application to catalytic cracking of hydrocarbon fuels(亲油性纳米ZSM-5分子筛的制备及其对碳氢燃料的催化性能)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2013
采用不同链长的有机硅烷作为表面修饰剂,在正庚烷/正丁醇中利用溶剂热合成法制备得到亲油性纳米ZSM-5分子筛.通过有机硅烷与氧化物晶种表面的羟基作用,其长链化学键合到晶种表面,形成保护层,既抑制了氧化物颗粒间的团聚,又控制了纳米ZSM-5的粒径.所制备的纳米ZSM-5平均粒径为20~70 nm,且粒径随着有机硅烷碳链长度的降低而逐渐减小.添加一定量的该纳米ZSM-5到碳氢燃料模型化合物正十二烷中,在管式反应器中(550 ℃,4 MPa)考察催化裂解行为,结果表明该亲油性纳米ZSM ...
LIUJia-zhen(刘家珍)   +4 more
doaj   +1 more source

Dual‐Phase Interpenetrating Reinforcement Enables an Ultrathin Sodium Metal Anode for High‐Energy‐Density Batteries

open access: yesRare Metals, Volume 45, Issue 9, September 2026.
ABSTRACT Ultrathin sodium (Na) metal anodes (< 40 μm) with superior electrochemical performance are essential in developing high‐energy‐density sodium metal batteries (SMBs). Nonetheless, Metallic Na's poor processability hinders its practical application.
Hao Yao   +6 more
wiley   +1 more source

光生电子调控改性C3N4及其光催化降解性能研究

open access: yesGongye shui chuli, 2023
对氮化碳(C3N4)进行氮掺杂碳纳米管(N-Ct)修饰,形成的氮掺杂碳纳米管/氮化碳(N-Ct/C3N4)复合材料的光催化活性明显提高。在可见光条件下,复合材料对罗丹明B(RhB)有较好的降解效果,其中5%N-Ct/C3N4(理论N-Ct质量分数为5%)在2 h内对RhB的降解率可达99.0%,相应的TOC去除率为59.0%,降解性能最为卓越且显著高于普通C3N4材料。利用X射线衍射、光电子能谱、紫外-可见光吸收光谱等多元表征手段对复合材料进行理化性质表征和理论计算,结果表明,经N-Ct修饰后 ...
孙寒
doaj   +2 more sources

MoS2‐Modified Bamboo‐Like Nitrogen‐Doped Carbon Nanotubes Encapsulating Ni Nanoparticles Enabling Synergistic Adsorption–Catalysis for High‐Performance Lithium–Sulfur Batteries

open access: yesRare Metals, Volume 45, Issue 8, August 2026.
ABSTRACT The commercialization of lithium–sulfur batteries (Li–S batteries) has been hindered by the shuttle effect of lithium polysulfides (LiPSs) and sluggish redox kinetics. In this study, we constructed a three‐dimensional hollow conductive network host material for sulfur with synergistic enhancement effects.
Jie Yang   +6 more
wiley   +1 more source

Breaking Shuttle‐Induced Kinetics Limitations in Lithium–Sulfur Batteries: Confined FeS2 Nanocatalyst With Optimized d‐Band Center

open access: yesRare Metals, Volume 45, Issue 7, July 2026.
ABSTRACT The commercialization of lithium‐sulfur batteries (LSBs) faces dual challenges of sluggish sulfur redox kinetics and lithium polysulfides (LiPSs) shuttling. Herein, we demonstrate a synergistic strategy combining multidimensional structural confinement with d‐band center modulation to simultaneously suppress LiPSs diffusion and catalyze ...
Shibo Rong   +8 more
wiley   +1 more source

多壁碳纳米管/壳聚糖复合材料对水中染料的吸附

open access: yesGongye shui chuli, 2022
随着我国印染工业的快速发展,大量印染废水随之产生。印染废水具有色度高、难降解有机物浓度高、水质波动大等特点,对环境和人类健康造成危害。采用碱液沉积交联法制备多壁碳纳米管/壳聚糖复合材料(MWCNTs/CS),对二甲酚橙和茜素红染料模拟废水进行吸附处理,考察不同制备条件对吸附性能的影响。结果表明:多壁碳纳米管与壳聚糖质量比为1∶4、交联剂戊二醛投加量为2.5 mL、交联温度为50 ℃、交联时间为5 h时,制得的复合材料吸附效果最好。MWCNTs/CS对茜素红的最大吸附量可达291.44 mg/g ...
靳君, 张聪璐
doaj   +2 more sources

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