The present study investigated adsorption of 2,4-dichorophenoxy acetic acid(2,4-D) on titania (TiO2) nanoparticles with surface modification by cationic surfactant, cetyltrimethylammonium bromide (CTAB). Titania nanoparticles which were successfully synthesized by sol-gel method, were characterized by X-ray diffraction (XRD) and Transmission electron microscopy (TEM). Surface modification of TiO2 with CTAB enhanced the removal of 2,4-D significantly. Some effective conditions affect to the removal of 2,4-D using CTAB modified TiO2 such as pH and adsorbent dosage were systematically studied and found to be 5 and 10 mg/mL, respectively. Adsorption mechanisms of 2,4-D onto CTAB modified TiO2 was suggested based on the change in surface charge after adsorption.
The present study investigated the photodegradation of 2,4-Dichlorophenoxyacetic acid (2,4-D) in a water environment using synthesized titania nanoparticles (TiO2-NPs). The TiO2-NPs fabricated by sol-gel method were distinguished by X-ray diffraction (XRD) and Transmission electron microscopy (TEM), Infrared spectroscopy (IR), and zeta potential measurements. The results indicated that TiO2 - NPs were nanospheres of appropriately 30nm with a major anatase phase. Synthesized TiO2-NPs have the point of zero charge (PZC) of around 6.0. The efficient conditions for photocatalysis degradation of 2,4-D under sunlight were considered and found to be 120 min, pH 11, and 1 mM KCl. Under ideal conditions, the photodegradation efficiency of 2,4-D reached greater than 72 %. Our results suggest that TiO2-NPs would be promisingly applied for eliminating 2,4-D from an aqueous solution.
Abstract-The advancements in information and communications technologies (ICT) and micro-nano manufacturing lead to innovative developments of smart sensors and intelligent devices as well as related assistive technologies which have been directly contributing to improving the life quality, from early detection of diseases to assisting daily living activities. Physical activity monitoring and fall detection are two specific examples where assistive technologies with the use of smart sensors and intelligent devices may play a key role in enhancing the life quality, especially improving the musculoskeletal health which is an essential aspect of health and wellbeing; and it is more important for the older people. This paper presents and discusses about how sensors and wearable devices, such as accelerometers and mobile phones, may be employed to promote the musculoskeletal health. Assistive technologies and methods for physical activity monitoring and fall detection are discussed, with the focus on the fall detection using mobile phone technology, and assessments of the loading intensity of physical activity in a non-laboratory environment. The possible research directions, challenges and potential collaborations in the areas of assistive technologies and ICT solutions for the older populations are proposed and addressed.
Tuyên ngôn Độc lập của Hồ Chí Minh là tác phẩm văn chính luận quan trọng trong văn học Việt Nam hiện đại, được giảng dạy ở chương trình Trung học phổ thông nhiều năm. Các vấn đề như: quyền con người, quyền dân tộc, phương pháp lập luận, phong cách văn chính luận đã được đề cập khá rõ nét; nhưng về giá trị văn hóa - tư tưởng còn có thể tìm hiểu đào sâu, mở rộng thêm. Về phương diện văn hóa - tư tưởng, bản tuyên ngôn hàm chứa tinh hoa văn hóa dân tộc và nhân loại. Tinh hoa văn hóa dân tộc trong Tuyên ngôn Độc lập thể hiện ở tinh thần đấu tranh giành độc lập cho đất nước, tự do cho dân tộc; tinh thần nhân đạo và hợp tác quốc tế đạt đến chính nghĩa, văn minh. Tinh hoa văn hóa nhân loại bao gồm những tư tưởng đúc kết trong Tuyên ngôn Độc lập của Mỹ (1776), Tuyên ngôn Nhân quyền và Dân quyền của Pháp (1789), chủ nghĩa Xã hội khoa học của Marx - Lenin và chủ nghĩa Tam dân của Tôn Trung Sơn. Bài viết tập trung luận bàn, khẳng định những vấn đề này.
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