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Kim, Jinsu,Sambudi, Nonni Soraya,Cho, Kuk Elsevier 2019 Journal of environmental management Vol.231 No.-
<P><B>Abstract</B></P> <P>Owing to their high-risk factor, many attempts have been made to remove radionuclides from water. Sr<SUP>2+</SUP> ions are the target of removal by synthesized hydroxyapatite in this research. A facile method for synthesizing high-surface-area hydroxyapatite by in-situ precipitation using excess diammonium phosphate solution and without any additive was developed. The highest surface area achieved using this method was 177.00 m<SUP>2</SUP>/g, and the synthesized hydroxyapatite was also mesoporous. The effects of different pH, temperatures, and ion concentrations during synthesis on the properties of the hydroxyapatite were assessed, and it was found that a low temperature and high pH were optimal for synthesizing high-surface-area hydroxyapatite. The maximum strontium removal capacity of 28.51 mg/g was achieved when the pH-7.5 solution was used. This performance is competitive in comparison with previously developed synthesized materials. Synthesized hydroxyapatite could effectively remove radioactive strontium from an aqueous solution for nuclear waste management.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Hydroxyapatite was produced an using in-situ precipitation without an additive. </LI> <LI> It had a high surface area of 177 m<SUP>2</SUP>/g and mesopores with a Ca/P ratio of 1.67. </LI> <LI> Its maximum removal capacity of strontium was 28.51 mg/g at pH 7.5. </LI> <LI> It can remove radioactive strontium from an aqueous solution. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
Electrospun Porous Polylactic Acid Fibers Containing CdS for Degradation of Methylene Blue
Chit Seng Ho,Nur Hafizah Zainal Abidin,Muhammad Wahyu Nugraha,Nonni Soraya Sambudi,Fathilah Ali,MOHD Dzul Hakim Wirzal,Laksmi Dewi Kasmiarno,Sarah Amalina Adli 한국섬유공학회 2020 Fibers and polymers Vol.21 No.6
The immobilization of photocatalyst in polymer fibers has been found to improve photodegradation of dye andrecyclability of material. In this study, porous polylactic acid (PLA) fibers were utilized as photocatalyst support usingelectrospinning technique to synthesis the fibers. The cadmium sulfide (CdS) was embedded in fibers at the amount of1 wt%, 3 wt%, and 5 wt% as photocatalyst agent with absorption in visible light range. The electrospun fibers experiencedincreasing in diameter for 2.6 times (from 175 nm to 450 nm), due to incorporation of CdS. The synthesized CdS has bandgap of 2.35 eV, and its presence in composite fibers can be detected by using energy dispersive X-ray (EDX) and X-raydiffraction (XRD) analyses. The photodegradation was performed under low-powered halogen lamp, with 90 % removal ofmethylene blue (MB) after 10 hours of irradiation using CdS(3 wt%)/PLA fibers. This result shows higher performance incomparison with PLA and CdS which could only remove 57 % and 65 % of MB, respectively. The recyclability of compositewas tested with satisfying performance; with around 60 % of MB removal was maintained after five times of recycleexperiments.
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.