Jinan, China
Jinan, China

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Guo H.,Shandong University | Lin H.,Shandong University | Li Y.,CNGC Institute 53 | Feng S.,Shandong University | Zhu Y.,Shandong Academy of Sciences
Desalination and Water Treatment | Year: 2016

Oily sludge was first dewatered using Fenton’s reagent and sawdust, and was then made into adsorbents. These lab-made adsorbents were applied to adsorb the reactive brilliant red X-3B dye in liquid phase. The adsorbent was activated at 800°C for 45 min in an inert atmosphere after activation for 24 h by ZnCl2 at 40 wt%. Results show that the adsorbent has a maximum apparent surface area of 183 m2 g−1 and total volume of 0.19 cm3 g−1. The results of the kinetic and isothermal studies show that the adsorbent fits the pseudo-second order and Langmuir models, respectively. Moreover, the adsorption is confirmed to be an endothermal process. The adsorbent achieved a maximum equilibrium adsorption capacity of 67.72 mg g− 1 at 30°C with an equilibrium time of 8 h. A total of 8 metals, including heavy metals, were found in the raw material, and most of them, except for Fe, can hardly be dissolved into the liquid after adsorption. Although the adsorption capacity is lower than that of common commercial-activated carbon, the lab-made adsorbent has the advantages of low cost and low adsorption equilibrium time. © 2016 Balaban Desalination Publications. All rights reserved.


Zhang C.-M.,CNGC Institute 53 | Du H.-T.,CNGC Institute 53 | Pang M.-L.,CNGC Institute 53 | Zhang Z.-G.,CNGC Institute 53 | And 4 more authors.
Hangkong Cailiao Xuebao/Journal of Aeronautical Materials | Year: 2013

Hydrogenated nitrile rubber (HNBR)/organic montmorillonite (OMMT) nano-composites was prepared using melt intercalation preparation. And the amount of organic montmorillonite (OMMT) were 0 phr, 5 phr, 10 phr, 15 phr, 20 phr respectively. This paper examines the effect of the OMMT amount on the mechanical properties and ablation performance, and we analysis the ablative carbon layer morphology and composition of the nanocomposite. The results show that OMMT have a reinforcing role in a certain range (0 phr~15 phr). But it can not improve of the strength and elongation when its content is too much (20 phr). In the experimental range, with the increase of its content, ultimate permanent deformation and hardness of the materials increases, and its elastic resilience reduce in turn. The linear ablation rate and the mass ablation rate is generally a downward trend. The mechanical melt mixing process makes the span of montmorillonite lamella change, and the lamella structure is completely destroyed after ablation. The composite positive and negative structure of carbon layer formed in ablation is dirrerent obviously.


Song B.,Nanjing University of Science and Technology | Huang Z.-X.,Nanjing University of Science and Technology | Zhai W.,CNGC Institute 53 | Zu X.-D.,Nanjing University of Science and Technology | And 2 more authors.
Zhendong yu Chongji/Journal of Vibration and Shock | Year: 2016

The finite element code ANSYS/LS-DYNA was used to numerically simulate the processes of dynamic response of three kinds of explosion-proof pots under explosive loading of 1.2 kg TNT. Anti-detonation properties of explosion-proof pots made of different sandwich structures with no-sandwich, polyurea elastomer and rubber were studied. The effects of different sandwich structures on the global deformation of explosion-proof pots and the energy absorption characteristics of polyurea elastomer sandwich and rubber sandwich were analyzed. The reliability of the simulation results was validated with deformation tests of explosion-proof pots made of sandwich with polyurea elastomer under explosive loading. The results demonstrated that either the deformation or the energy absorption of explosion-proof pots made of sandwich with polyurea elastomer is superior to that of those without sandwich and made of sandwich with rubber under the same explosive loading; the attenuating level of shock wave propagation in polyurea elastomer is the largest. © 2016, Editorial Office of Journal of Vibration and Shock. All right reserved.


Fan W.,Shandong University | Wang Y.,Shandong University | Wang C.,Shandong University | Chen J.,Shandong University | And 3 more authors.
Applied Surface Science | Year: 2016

An innovative technique has been developed to obtain the uniform catalyst coating on continuously moving carbon fibers. Carbon nanotube (CNT)-grafted carbon fibers with significantly improved tensile strength have been succeeded to produce by using chemical vapor deposition (CVD) when compared to the tensile strength of untreated carbon fibers. The critical requirements for preparation of CNT-grafted carbon fibers with high tensile strength have been found, mainly including (i) the obtainment of uniform coating of catalyst particles with small particle size, (ii) the low catalyst-induced and mechano-chemical degradation of carbon fibers, and (iii) the high catalyst activity which could facilitate the healing and strengthening of carbon fibers during the growth of CNTs. The optimum growth temperature was found to be about 500 °C, and the optimum catalyst is Ni due to its highest activity, there is a pronounced increase of 10% in tensile strength of carbon fibers after CNT growth at 500 °C by using Ni catalyst. Based on the observation from HRTEM images, a healing and crosslink model of neighboring carbon crystals by CNTs has been formulated to reveal the main reason that causes an increase in tensile strength of carbon fibers after the growth of CNTs. Such results have provided the theoretical and experimental foundation for the large-scale preparation of CNT-grafted carbon fibers with the improved tensile strength, significantly promoting the development of CNT-grafted carbon fiber reinforced polymer composites. © 2015 Elsevier B.V. All rights reserved.


Fan W.,Shandong University | Wang Y.,Shandong University | Chen J.,Shandong University | Yuan Y.,Shandong University | And 3 more authors.
RSC Advances | Year: 2015

An efficient method to obtain a good and uniform catalyst coating on the surface of carbon fibers was developed by modifying carbon fibers with electrochemical anodic oxidation (EAO), the homogeneous growth of carbon nanotubes (CNTs)/carbon nanofibers (CNFs) was then achieved on the surface of carbon fibers via chemical vapor deposition (CVD). According to the study on the effect of both the catalyst type and concentration on CNT/CNF growth, it was found that when the concentration of catalyst precursor is higher than a critical value, catalytic efficiency decreases apparently with the increase of catalyst concentration regardless of the catalyst type employed. The influence of CVD temperature on tensile strength of CNT/CNF-grafted carbon fibers was also investigated. At low temperatures, such as 500°C and 550°C, growing CNTs/CNFs without any degradation of mechanical properties of carbon fibers was successfully achieved, which demonstrated the feasibility of growing CNTs/CNFs directly on carbon fibers. A mathematical model for CNT growth was established to explain the experimental results successfully, which can be used to accurately control the morphology and yield of CNTs/CNFs grown on the surface of carbon fibers. Hence it provides theoretical guidance for the large-scale synthesis processes. © 2015 The Royal Society of Chemistry.


Zhu H.-L.,Shandong University | Zhu H.-L.,CNGC INSTITUTE 53 | Zhang Y.-J.,Shandong University | Yu M.-X.,Shandong University | And 4 more authors.
Rengong Jingti Xuebao/Journal of Synthetic Crystals | Year: 2014

Mn-Zn ferrite Mn0.3Zn0.7Fe2O4 was prepared by sol-gel/combustion process, and the preparation conditions were investigated. The samples were characterized by XRD, SEM, TG-DSC, Network analyzer, and so on. The results showed that the pure Mn-Zn ferrite with a uniform particle size of about 160 nm could be formed when pH value was around 7.0, the mole ratio of citrate and metal salt was 1:1, the calcining temperature was 1050°C, and the calcining time was 3 h. The as-prepared Mn0.3Zn0.7Fe2O4 ferrite performed both the dielectric loss properties and magnetic loss properties. It showed excellent microwave absorption properties with the reflection loss less than -10 dB in the frequency range of 12.5-15 GHz.


Liang L.,Shandong University | Liang L.,King Abdullah University of Science and Technology | Jianqin Z.,CNGC Institute 53 | Xun S.,Shandong University | And 3 more authors.
Laser Physics Letters | Year: 2013

Potassium dihydrogen phosphate (KDP) crystals with different amounts of sulfate concentration were grown and the transmittance spectrum was studied. A crystal with high sulfate replacement density exhibits heavy absorption property in the ultraviolet region which confirms and agrees well with former results. © 2013 Astro Ltd.


Qiu G.-H.,CNGC Institute 53 | Jiang X.-S.,CNGC Institute 53 | Yu M.-X.,CNGC Institute 53 | Pan S.-B.,CNGC Institute 53
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | Year: 2010

A novel intumescent flame retardant was prepared from pentaerythritol phosphate melamine salt (PPM) and pentaerythritol phosphate (PEPA), and was used to flame retard polypropylene (PP). The flammability performance, mechanical properties and thermal stability of flame-retarded PP were characterized by limiting oxygen index (LOI), UL94 test, differential scanning calorimetry (DSC) and thermogravimetric analysis (TG). The results show that with the mass ratio of PPM to PEPA of 3:2 and a 23% loading of PPM and PEPA, PP/PPM/PEPA blends meet UL94 V0 rating. Compared to PP, flexural strength of flame-retarded PP increases, tensile strength and impact strength decreases, decompition rate decreases, charring resides enhances.

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