The morphology, porosity and productivity control of carbon nanofibers or nanotubes on modified activated carbon

نویسندگان

  • Xiao-Wei Chen
  • Dang Sheng Su
  • Sharifah B.A. Hamid
  • Robert Schlögl
چکیده

Since their discovery, carbon nanotubes and carbon nanofibers (CNTs or CNFs) have exhibited potential in a wide range of physical and chemical applications [1] and [2]. For applications in gas phase catalysis, loose CNTs or CNFs are unsuited because they limit the catalyst–reactant transport properties and they are difficult to handle when filling in the reactor tubes. In addition, there is a health risk associated with loose CNTs or CNFs [3]. Immobilizing CNTs or CNFs on a supporting material is thus highly desirable. CNFs or CNTs have previously been grown on carbon materials, particularly on CNT or CNF support [4], [5], [6] and [7]. Activated carbon (AC) has been widely used as an efficient adsorbent for the purification of water, air and many fluid synthetic and natural products [8]. Previously we have reported that CNFs nested inside and immobilized onto modified AC exhibit an excellent adsorption behavior for heteropolymolybdate compared to metal cations [9]. The productivity of CNFs and CNTs is a function of the preparation conditions, such as nature of the substrate and of the catalyst, temperature, gas composition and time on stream [10] and [11]. In this work, a systematic study was conducted of the parameters for the synthesis of CNFs from C2H4 on modified AC. The productivity, porosity and morphology of the CNF/AC composites can be controlled with iron salt precursors, the ratio of C2H4/H2, the reaction temperature and the reaction time.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

Morphology Change and Structural ‎Evaluation of Carbon Nanostructures

   In this study, the change of porosity and roughness of carbon nanostructures, including fullerenes, carbon nanotubes and graphene was investigated according to oxidation process. The effect of oxidation was more sensible on smoother surface of nanostructures. Oxidation increases surface roughness of graphene up to 5.2% and porosity up to 35.2%. While, roughness of hummers graphene is 13....

متن کامل

Comparative investigation on the correction factors of hydrogen permeability on CNTs-Mixed matrix membrane

This paper discusses different important gas permeation models such as “Maxwell”, “Bruggeman”, “Lewis-Neilson”, and “Pal” models to predict “Mixed Matrix Membranes” (MMMs) performance. The main parameter considered and discussed is the permeability of Hydrogen on Carbon Nanotubes (CNTs)-MMM. For evaluation of the theoretical models, experimental data of permeability for H2 were compa...

متن کامل

Comparative investigation on the correction factors of hydrogen permeability on CNTs-Mixed matrix membrane

This paper discusses different important gas permeation models such as “Maxwell”, “Bruggeman”, “Lewis-Neilson”, and “Pal” models to predict “Mixed Matrix Membranes” (MMMs) performance. The main parameter considered and discussed is the permeability of Hydrogen on Carbon Nanotubes (CNTs)-MMM. For evaluation of the theoretical models, experimental data of permeability for H2 were compa...

متن کامل

Modification of activated carbon by cold plasma and its effect on the adsorption of toluene

Abstract Background and aims: Clean air is one of the basic needs for human health and well-being. However, along with economic growth and development, transportation, urbanization and energy consumption have also risen and provide many concerns such as air pollution, which require urgent and wide attention. Air pollution in the worldwide is considered as a risk factor for human health and one...

متن کامل

Carbon nanotubes reinforced electrospun chitosan nanocomposite coating on anodized AZ31 magnesium alloy

Chitosan based nanofibers containing carbon nanotubes were applied on AZ31 magnesium alloy via electrospinning. The magnesium substrate was initially anodized in a NaOH solution in order to improve the adhesion between the coating and substrate. Electrospinning parameters were optimized and homogenous nanofibers composite coatings were produced. Addition of carbon nanotubes reduced the size of ...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2007