توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱Free–template aluminum–rich ZSM–5 membranes: Synthesis and characterization via in situ nucleation method
نویسنده(ها): ،
اطلاعات انتشار: یازدهمین کنگره ملی مهندسی شیمی ایران، سال
تعداد صفحات: ۹
ZSM–5 zeolite membrane with low Si\Al ratios (ca. 12–13.5) was successively synthesized in the absence of organic template by in situ nucleation on the surface of α –Al2O3 support disks. The molar compositions of the reactants were 3.25 Na2O: Al2O3: 30 SiO2: 958 H2O. The as–synthesized membrane was characterized by X–ray diffraction (XRD), Fourier transform infrared (FT–IR) spectroscopy, scanning electron microscopy (SEM) in combination with electron dispersive X–ray (EDX). The membrane synthesis process took 40 h, and was carried out under hydrothermal condition, at autogenic pressure, at a static condition of 185°C. Permeation experiments were conducted using pervaporation of
Ethanol\water and Isopropanol\water for quality assessment of obtained membrane.<\div>

۲Organozeolite, A new absorbent for removing harmful anions from recirculating aquaculture effluent
اطلاعات انتشار: سومین همایش ملی آب و فاضلاب با رویکرد بهره برداری، سال
تعداد صفحات: ۵
Waste water treatment is important for an economical and environmentally friend aquaculture enterprise. In last 30 years, synthetic and natural zeolites have been increasingly acknowledged due to their capability of removing toxic ions at lower concentrations which are common in aquaculture effluent. Contaminants in aquaculture effluent such as nitrate and nitrate can promote eutrophication of receiving waters and be potentially toxic to aquatic life. These systems are still in their infancy and there is not enough information in this regard. Present study aimed to have more insight into the effects of different ambient pHs (6, 6.5, 7, 7.5 and 8) and temperatures (10, 15 and 20 C) on the ion adsorption capability of modified zeolite. To this end, zeolite obtained from the Semnan, located in the center of Iran, was modified using tetradecyltrimethylamonium bromide (TDTMA) and exposed to effluent from a fish culturing facility. ANOVA revealed that temperature had a well–arranged effect on nitrate and nitrite removal by modified zeolite compared with pH. Zeolite significantly showed higher nitrate and nitrite removal capacity at 15°C (p<0.05). However, pH had not any significant effects on nitrate removal (p>0.05). However, higher nitrite uptake was observed at pH= 6 and ph=8 (p<0.05). To devise an efficient zeolite based removal filters special for aquaculture effluents, more studies are needed in future.<\div>

۳Removal of anions from aquaculture effluent by Organozeolite
اطلاعات انتشار: دومین کنفرانس بین المللی زئولیت ایران، سال
تعداد صفحات: ۴
Synthetic and natural zeolites have become increasingly important in the last 30 years due to their wide range of physiochemical properties that make them capable of removing toxic ions at lower concentrations which are common in aquaculture effluents. Natural zeolites can remove ammonia from ambient aquaculture wastewater. At the present study the natural zeolite was characterized using XRD and XRF analyses. For removing anions from solutions and aquaculture effluent, modification was practiced with tetradecyletremethyleammoniumbromid (TDTMA) to increase the adsorption of anions (on the zeolite), which subsequently increase the ion absorption capacity of zeolite per se. Under the experimental and a standard solutions the effects of pH and temperature was evaluated. Results showed that increasing pH promote anion absorption (except for phosphate in standard condition). Like pH, temperature has good effect on the anion absorption. Results indicated that absorption active layer (Surfactant) has good tendency for absorption of nitrate ions. Results showed that clinoptilolite treated with TDTMA (SMZ) was efficient in removing undesirable anions from aquaculture wastewaters.<\div>
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