نتایج جستجو برای: HDTMA

تعداد نتایج: 90  

2005
Gilberto Abate Jorge Cesar Masini

Estudou-se a interação de atrazina (AT), propazina (PROP), desetil-atrazina (DEA), deisopropilatrazina (DIA) e hidroxi-atrazina (HAT) com o argilomineral vermiculita saturado com K (VTK) e com VTK modificada pela incorporação de hexadeciltrimetil-amônio (HDTMA-VT) no espaço interlamelar. A VTK bruta teve interação desprezível com AT, PROP e DEA, interação moderada com DIA e forte interação com ...

Journal: :Catalysts 2022

Slow kinetics is one of the capital issues photocatalytic technology because its heterogeneous nature, which involves multi-step processes. Herein, we show that simple modification sol-gel-based TiO2-smectite composite by hexadecyltrimethylammonium bromide (HDTMA) significantly boosts adsorption and efficient light towards removal diclofenac from water. Three photocatalysts were prepared, inclu...

In this study, the main objective is the preparation and the characterization of a modified Algerian bentonite based adsorbent by intercalation with hexadecyltrimethylammonium bromide (HDTMA). Natural and modified bentonites were characterized using thermogravimetric analysis (TGA), X-ray diffraction (XRD) and infrared spectroscopy (FTIR). The X-ray results indicate that the geometry of the int...

Journal: :Chemosphere 2002
Liuyan Yang Lijuan Jiang Zhi Zhou Yuangao Chen Xiaorong Wang

Natural montmorillonite was modified with a quaternary ammonium compound, hexadecyltrimethylammonium (HDTMA). The sedimentation capabilities of unmodified and modified montmorillonites were then investigated. The sedimentation velocity of modified montmorillonites increased if the amounts of adsorbed HDTMA were from 0.3 to 1.0 times the cation exchange capacitity (CEC). It also emerged that the...

Journal: :Journal of water process engineering 2022

In the present study, we investigated comparatively role of hexadecyltrimethylammonium bromide (HDTMA) in enhancing adsorption and photocatalytic activity BiPO4 coated montmorillonite (M-BiPO4), smectite (S-BiPO4). Montmorillonite has large interlayer spacing compared to smectite. Firstly, it was found that simple hybridization with clays led enhance visible light response. The co-fixation HDTM...

2012
M. E. Parolo L. G. Fernández María E. Parolo

The antibacterial activity of silver and cationic surfactant modified smectites from North Patagonian, Argentina, were tested in growth inhibition of Escherichia coli bacteria by the test of susceptibility on solid medium. The exchange reactions were carried out using Ag and hexadecyltrimethylammonium (HDTMA) cations in larger amounts than those conventionally required to form monolayer on the ...

2011
Kanaji Masakorala Andrew Turner Murray T. Brown

The toxicities of three synthetic surfactants to the marine macroalga, Ulva lactuca, have been examined by monitoring chlorophyll a fluorescence quenching. The anionic surfactant, sodium dodecyl sulphate (SDS), exerted no measurable toxicity over the concentration range 0–10 mg L, while presence of the non-ionic surfactant, Triton X-100 (TX), elicited a small reduction in photochemical efficien...

Journal: :Spectrochimica acta. Part A, Molecular and biomolecular spectroscopy 2004
He Hongping Frost L Ray Zhu Jianxi

In this paper, FTIR spectroscopy using attenuated total reflection (ATR) and KBr pressed disk techniques has been used to characterize sorbed water and HDTMA+ in organo-clay. Sorbed water content decreases with the intercalation of HDTMA+. With the decrease of the sorbed water content, the position of the nu2 mode shifts to higher frequency dramatically while the stretching vibration shifts to ...

Journal: :Düzce Üniversitesi bilim ve teknoloji dergisi 2022

Bu çalışmada hayvancılıkta yaygın bir şekilde kullanılan oksitetrasiklin (OTC) antibiyotiğinin sodyum ve hekzadesiltrimetilammonyum (HDTMA) ile modifiye edilmiş zeolite adsorpsiyonu incelenmiştir. Adsorpsiyon çalışmaları farklı OTC konsantrasyonları, çözelti pH’larında adsorbent dozajlarında yapılmıştır. izoterm verileri Freundlich modeline uygulanmıştır. HDTMA-zeolit antibiyotik giderimi pH’a ...

Journal: :UNESA Journal of Chemistry 2023

Penelitian ini bertujuan untuk mengetahui hasil pelepasan kadar nitrogen pada sampel pupuk dengan variasi perbandingan volume zeolit massa surfaktan kationik serta karakterisasi kimia FTIR. Pada penelitian digunakan alam dan heksadesiltrimetilammonium (HDTMA) sebagai bahan utama. Pembuatan dalam cara aktivasi menggunakan HCl 1M lalu di tambahkan HDTMA 0.05M 1:1, 1:3, 1:5, kemudian ditambahakan ...

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