نتایج جستجو برای: جاذب اصلاح شدهی nh2 mcm 41

تعداد نتایج: 132768  

Journal: :Catalysts 2023

The Ni-based catalyst has been intensively studied for CO methanation. Here, MCM-41 is selected as support to prepare xNi/MCM-41 catalysts with various Ni contents and the catalytic performance methanation in a slurry-bed reactor investigated under different reaction conditions. conversion gradually increases temperature or pressure rises. As content increases, specific surface area pore volume...

F. Farzaneh

Cu(II) complex with L-histidine (His) ligand, immobilized within Al-MCM-41, designated as Cu(His)2/Al-MCM-41 was prepared and characterized by powder X-ray diffraction (XRD), nitrogen adsorption desorption, FTIR, UV-Vis and chemical analysis techniques. The surface area and pore volume were found to decrease after immobilization of Cu(II) complex on Al-MCM-41. It was found that Cu(His)2/Al-MCM-...

Journal: :Photochemical & photobiological sciences : Official journal of the European Photochemistry Association and the European Society for Photobiology 2002
Isabel Casades Mercedes Alvaro Hermenegildo García Manoj Narayana Pillai

The influence of the chemical composition and silylation of mesoporous MCM-41 materials on the photochromic behaviour of adsorbed spiropyran (BIPS) and 6-nitrospiropyran was studied. Upon incorporation, the spiropyrans underwent ring opening to form either zwitterionic merocyanine or its corresponding O-protonated form. In all silica MCM-41 or in the MCM-41 containing aluminium, the O-protonate...

ژورنال: شیمی کاربردی 2019

در این مطالعه، مزوپور سیلیکاتی کیت-6 به صورت شیمیایی بر روی سطح هسته مگنتیت پوشش‌دار شده با سیلیکا سنتز شد و به روش شیمیایی سطح نانوکامپوزیت به‌وسیله گروه‌های آمین عامل‌دار شد تا نانوکامپوزیت مغناطیسی Fe3O4@SiO2@Kit-6-NH2 به‌دست آید. پس از تایید ساختار به‌وسیله‌ی روش‌های XRD، FT-IR، EDX و SEM کارآیی نانوکامپوزیت سنتزی به عنوان یک جاذب برای حذف رنگ راکتیو زرد 160 از محلول‌های آبی مورد بررسی قرار...

Journal: :Water conservation science and engineering 2021

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...

2003
Tao Li Soofin Cheng Jyh-Fu Lee Ling-Yun Jang

Molybdenum and zirconium mixed oxides were supported on siliceous MCM-41 mesoporous material. The resultant materials were characterized with various techniques such as X-ray diffraction (XRD), nitrogen adsorption, Transmission electron microscopy (TEM), XANES, NH3-TPD, and Diffuse reflectance infrared Fourier transform spectra (DRIFTS) of pyridine. It was found that the well-ordered channeling...

Journal: :Journal of colloid and interface science 1998
Neimark Ravikovitch Grün Schüth Unger

Methods of nonlocal density functional theory (NLDFT), proposed recently for predictions of adsorption equilibrium and calculations of pore size distributions in micro- and mesoporous materials, were tested on reference MCM-41 materials. Five newly synthesized MCM-41 adsorbents with presumably uniform pore channels varying from 32 to 45 Å were characterized by X-ray diffraction (XRD), nitrogen ...

پایان نامه :دانشگاه آزاد اسلامی - دانشگاه آزاد اسلامی واحد تهران مرکزی - دانشکده علوم پایه 1391

نانو تکنولوژی رشته ای است که به سرعت در حال پیشرفت است و شامل ساخت و استفاده از مواد و تجهیزات در مقیاس نانو می باشد. مواد مختلفی حاوی ترکیبات نانو نقش مهمی در علم و فناوری نوین از جمله علم داروسازی ایفا می کند. mcm-41 یکی از مواد مزوپور امزوزه به عنوان حامل دارو بکار می رود.مواد آرایش یافته mcm-41 دارای شبکه ای از مجراها و فضاهای تهی با اندازه مناسب در مقیاس نانو (nm50-2 ) است.ساختار این منفذ...

Journal: :Environmental science & technology 2013
Liang-Yi Lin Hsunling Bai

An efficient and economic approach is proposed for the fast and direct recovery of silica materials from photonic waste powder. Unlike the conventional alkaline fusion method for the extraction of silica from waste materials, this method possesses advantages of a rapid and low-energy-consumed process with total recovery yield. The obtained mesoporous silica material, denoted as MCM-41(DU)-F, wa...

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