نتایج جستجو برای: mcm 48
تعداد نتایج: 145740 فیلتر نتایج به سال:
MCM-48 were prepared using hexadecyl trimethyl ammonium bromide and TEOS modified with N1-(3-trimethoxysilylpropyl) diethylenetriamine by post-synthesis method to develop efficient adsorbent for heavy metal adsorption. These materials determined X-ray diffraction, N2 adsorption–desorption measurement, scanning electron microscopy. The results show that the modification of resulted in a decrease...
The direct and indirect methods in solvent media and grinding method in a solvent-free media were used to prepare the MCM-41/ZnO and MCM-48/ZnO photocatalysts. The X-ray diffraction (XRD) patterns showed that zinc oxide nanoparticles were put into MCM-41 and MCM-48 substrates and there were ZnO crystallites as secondary phase in the extra framework of mesoporous materials. The decrease of surfa...
Ecofriendly chitosan/Al-MCM-48 (CH/Al-MCM) was synthesized from natural microcline and assessed as a potential adsorbent of As (V) ions with enhanced capacity. The adsorption properties CH/Al-MCM were in comparison Al-MCM-41 single phase. studied exhibits 178.6 mg/g capacity which is higher than (124 mg/g). illustrated based on the pseudo-first-order kinetic, Langmuir isotherm, monolayer model ...
the direct and indirect methods in solvent media and grinding method in a solvent-free media were used to prepare the mcm-41/zno and mcm-48/zno photocatalysts. the x-ray diffraction (xrd) patterns showed that zinc oxide nanoparticles were put into mcm-41 and mcm-48 substrates and there were zno crystallites as secondary phase in the extra framework of mesoporous materials. the decrease of surfa...
The present work deals with the design of drug delivery systems based on 12-tungstophosphoric acid (TPA)-functionalized MCM-48 nanoparticles (TPA/nMCM-48), for poorly soluble GLP.
The catalytic performance in n-hexadecane hydrocracking of a set bifunctional catalysts composed acidic mesoporous silicas, i.e., SBA-15, MCM-41, MCM-48, and amorphous silica-alumina (ASA), Pd as acid (de)hydrogenation components, respectively, was investigated. selectivity to cracked products the occurrence secondary cracking depended on pore topology, acidity, dispersion. Si/Al ratio mesopore...
زمینه و هدف: در این مطالعه،جاذب سیلیکاته نانوحفره تحت عنوان MCM-48 با مساحت سطح بالایی تهیه شد و جهت افزایش ظرفیت جذب فلزات سنگین با استفاده از آمینوپروپیل تری متوکسی سیلان اصلاح گردید. جاذبهای سیلیکاته از جمله جاذبهای موثر در جذب فلزات سنگین هستند. روش بررسی: حذف یونهای فلزی کادمیوم و سرب از محلولهای آبی توسط MCM-48 و جاذب نانوحفره اصلاح شده NH2-MCM-48 در سیستم ناپیوسته بررسی شد. ا...
استفاده از جاذبهای سیلیکاته میان- حفره بهدلیل کارایی بالا برای حذف فلزات سنگین از آب و فاضلاب مورد توجه واقع شده است. MCM-48 یک جاذب سیلیکاته میان - حفره است که با اصلاح سطح آن بهوسیله گروههای عاملی، میتوان ظرفیت جذب فلزات سنگین را بهبود بخشید. در این مطالعه با عاملدار کردن میان- حفره MCM-48</str...
Titania containing cubic MCM-48 mesoporous materials were synthesized successfully at room temperature by a modified Stöber method. The integrity of the cubic mesoporous phase was retained even at relatively high loadings of titania. The TiO2-MCM-48 materials were extensively characterized by a variety of physico-chemical techniques. The physico-chemical characterization indicate that Ti4+ ions...
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