http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : Laleh Rajabi (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
-
Jamshid Behin,Laleh Rajabi,Hamid Etesami,Saeed Nikafshar 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.2
Extracted lignin from wastewater of Kraft process and lab-made salicylate alumoxane (Sal-A) nanoparticles were used as toughening agents in epoxy matrix. Epoxy/lignin composite, epoxy/Sal-A and epoxy/lignin/Sal-Al nanocomposites with various toughening agent loadings were cured with an aromatic diamine hardener. Lignin as an available cheap material and Sal-A, as multifunctional structures, both containing numerous phenolic hydroxyls on their surfaces, were incorporated into epoxy matrix with the aim of improving thermal and some mechanical properties of the resulting composites. Both particles interacted physically (directly) and chemically (indirectly) with the epoxy chains. Simplex lattice mixture design of experiment was applied for formulation development and optimization. Fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) were used to characterize the extracted lignin, Sal-A nanoparticles and synthesized composites. Differential scanning calorimetry (DSC) was used to interpret thermal curing process. The presence of lignin and Sal-A nanoparticles in the epoxy matrix decreased the exothermic peak temperature and total heat of curing reaction. In the presence of 2.5 wt% lignin and 1.875 wt% Sal-A nanoparticles, tensile strength of epoxy composites was 22.23% and 30.92% higher than that of reference (pure) epoxy resin, respectively. Vickers hardness of epoxy composites in the presence of 2.5 wt% lignin and 2.5 wt% Sal-A nanoparticles was increased by 17.41% and 15.39%, accordingly.
-
Hanieh Karimnezhad,Ehsan Salehi,Laleh Rajabi,Sara Azimi,Ali Ashraf Derakhshan,Meisam Ansari 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.6
Nanocomposite membranes were fabricated by dip-coating technique. Para-aminobenzoate alumoxane,boehmite–epoxide and chitosan were consecutively coated on the Kevlar fabric surface. The membraneswere utilized for removing n-hexane fromwater using a gravity-driven dead-end filtration setup. UV–vis,FTIR and SEM analyses were performed for characterization. Water affinity analyses revealed highlyhydrophilic nature of the modified membranes. Effect of pH was examined with the pH 2 providing thebest condition for oil–water separation. Maximum flux and rejection were obtained as 1128 Lm-2 h-1)and 94%, respectively. Deposited oil layer was effectively removed from the membrane surface using hotcitric acid solution.
-
Synthesis of Chitosan/Maleate-Alumoxane nanocomposite membranes for adsorption of anionic dye
Pegah Amiri,Jamshid Behin,Laleh Rajabi,Meisam Ansari 한국화학공학회 2020 Korean Journal of Chemical Engineering Vol.37 No.10
Chitosan/Mal-A nanocomposite membranes were synthesized and used for adsorption of Reactive Yellow 84 (RY 84) from aqueous solution. The membranes were prepared by solution-casting method with 2wt% Chitosan (Cs) and various ratios of Mal-A (0.3-0.9 wt%). FTIR and SEM analyses were used to characterize the Cs-based membrane. The results showed that a dense-thin-face layer associated with an open-structure layer was formed in the composite membrane containing 0.5 wt% Mal-A. Membrane performance was investigated as dye removal and permeate flux. The significant effects of the operating variables including pH, initial concentration of dye, and Cs/Mal-A dose, were evaluated on RY removal efficiency using response surface methodology (RSM). The results obtained from the experimental data were presented with the quadratic regression model. The adsorption kinetics and equilibrium isotherm were well described by the pseudo-second order and the Langmuir model, respectively. Adding Mal-A nanoparticles to the Cs matrix (0.5wt%) improved liquid permeability by 21% compared with the Cs membrane, while dye removal efficiency for both membranes remained approximately 100% at acidic pH and under a trans-membrane pressure of 3 bar. The protonation of the amine groups in CS/Mal-A results in a positive charge on the membrane surface which causes a complete removal of the anionic dye. The permeability improvement of ~57.2% for the composite membrane was achieved at a pressure difference of 5 bar, which corresponded to an efficiency reduction of 10%.
-
Safoora Rahimi,Rozita M. Moattari,Laleh Rajabi,Ali Ashraf Derakhshan,Mohammad Keyhan 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.23 No.-
Needle-like lepidocrocite nanoparticles with a diameter of 10–30 nm and a length of 100–300 nm and goethite nanospheres with a diameter of 10–60 nm were synthesized and examined as adsorbents for lead removal from solutions. FTIR, SEM and DLS characterized the nanomaterials. The most influential factor in the batch adsorption experiments by nanoparticles for capacity and removal efficiency was adsorbent dose and type of adsorbent, respectively. The optimum condition for lead removal by nanoparticles was found to be: C0 = 5 mg/L, pH = 5.2 and goethite as the more efficient adsorbent. Langmuir and Sips isotherms successfully described the adsorption of lead ions.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
