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Garba Zaharaddeen Nasiru,Haruna Abdurrashid,Tanimu Abdulkadir,Bello Binta Zakari,Zango Zakariyya Uba 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.6
The application of halloysite nanotubes (HNTs) in water purification is attracting extensive attention because they are inexpensive raw materials with a hollow nanotubular structure in the sub-micrometer range, a large specific surface area, pore volume, pore size, and adequate hydroxyl groups on their surface, thus enhancing their ability to be modified. These modified halloysite nanotubes (m-HNTs) have been widely used for a variety of applications, including chemocatalysis, biocatalysis, antibacterial action, drug delivery, gas separation, and adsorbents for wastewater treatment. They were reported to have been produced using a variety of synthetic processes which include self-assembly/vacuum filtering, extraction, solution casting, dehydration condensation, thermal polycondensation, chemical vapor deposition, and hydrothermal carbonization. In this review, we focus on the compilation of the most recent developments in the manufacture of m-HNTs, their characterization and possible uses in wastewater treatment. Finally, we present our personal views on the opportunities and challenges of future researches involving m-HNTs, hoping to inspire more researchers into participating in this fascinating area.
Adamu Usman Abubakar,Abu Bakar Noor Hana Hanif,Zango Zakariyya Uba,Sambudi Nonni Soraya,Iqbal Anwar,Hussin Mohd Hazwan,Hamidon Tuan Sherwyn 한국화학공학회 2023 Korean Journal of Chemical Engineering Vol.40 No.9
Low-temperature hydrothermal technique was employed for the synthesis of highly porous and crystalline MIL-101(Cr) metal-organic frameworks series. The resulting as-synthesized MOFs were characterized by Fourier transform infrared (FTIR) spectroscopy, powdered X-ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen adsorption-desorption analysis, thermogravimetric analysis (TGA), photoluminescence (PL) spectroscopy, and ultraviolet-visible (UV-vis) diffuse reflectance spectroscopy. The photocatalytic activity of the MOFs was evaluated for degradation of phenanthrene (PHE) under visible light irradiation. Among the MOFs, MIL-101@160 has the highest Brunner Emmett-Teller (BET) specific surface area and corresponding pore volume of 2,592.2 m2g−1 and 1.09 cm3g−1, respectively. Furthermore, it has shown higher photocatalytic degradation of the PHE than other samples with 98% degradation efficiency achieved within 150 minutes.