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22 results on '"Nafie, Nursiah La"'

1. Biosynthesis and characterization of gold nanoparticles using a bioreductor of Lannea coromandelica bark extract.

Author

Febrianti, Triana, Wahab, Abdul Wahid, Karim, Abdul, Azis, Nuritasari, and Nafie, Nursiah La

Subjects
FACE centered cubic structure, GOLD nanoparticles, ULTRAVIOLET-visible spectroscopy, ABSORPTION spectra, HYDROXYL group
Abstract

Research has been carried out on the biosynthesis of gold nanoparticles using a bioreductant of Lannea coromandelica bark extract. In this study, the precursor concentration and volume of the bioreductant extract were optimized to produce more stable gold nanoparticles. The results of the biosynthesis showed that analysis using UV-Vis spectroscopy obtained an absorption spectrum in the range of 524-545 nm at different concentrations of precursor and an absorption spectrum in the range of 529.5-530.5 nm with the addition of a different volume of bioreductor extract. In the reaction, the optimum concentration was 30 ppm HAuCl4 with the addition of 4 mL of extract volume, resulting in ruby red nanoparticles with an absorption peak at a maximum wavelength of 529.5 nm. The FT-IR results show that the group that plays a role in reducing gold nanoparticles is the hydroxyl group. The XRD results confirmed that the synthesized nanoparticles were pure gold nanoparticles having a face-centered cubic structure (FCC), with the resulting crystal size of 20.9 nm. [ABSTRACT FROM AUTHOR]

Published
2024
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2. Synthesis of high surface area mesoporous silica SBA-15 by adjusting hydrothermal treatment time and the amount of polyvinyl alcohol

Author

Thahir Ridhawati, Wahab Abdul Wahid, Nafie Nursiah La, and Raya Indah

Subjects
mesoporous silica, sba-15, surface area, hydrothermal treatment, Chemistry, QD1-999
Abstract

The high surface area of mesoporous silica SBA-15 has been synthesized successfully by hydrothermal treatment with direct addition of PVA, triblock copolymer (P123) as a direct structure agent and tetraethyl orthosilicate (TEOS) as a precursor. The mesoporous silica SBA-15 have been characterized with nitrogen physisorption, scanning electron microscopy, Fourier transformed infrared spectroscopy, and x-ray diffraction. Measurement of nitrogen sorption indicated that with the addition of PVA, the surface area is increased but the pore volume and pore diameter is not significantly. The short time of hydrothermal treatment (20 h) and using x-ray diffraction, showed that the morphological structure of silica SBA-15 can be changed to a orthorhombic crystal system. The result of the FTIR and SEM-EDX characteristic indicated the functional groups and morphology of the SBA-15 with a narrow pore size distribution. The BET method has exhibited the largest surface area 1726 m2/g, pore volume 1.4 cm3/g, and pore diameter 3.2 nm. It can be suggested that the silica mesoporous SBA-15 will have potential application prospect in catalysis, storage, and adsorbent.

Published
2019
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7. Method validation of copper (Cu) analysis in BCR 667 CRM estuarine sediment by Na2O2 dry digestion using atomic absorption spectrophotometer.

Author

Fibiyanthy, Tenrisa'na, Andi, Mahdalia, Nafie, Nursiah La, and Liong, Syarifuddin

Subjects
ESTUARINE sediments, SPECTROPHOTOMETERS, ATOMIC absorption spectroscopy, DIGESTION, SEDIMENT analysis, ABSORPTION, DETECTION limit
Abstract

Method validation of Copper (Cu) analysis in BCR 667 CRM estuarine sediment by Na2O2 dry digestion using Atomic Absorption Spectrophotometer (AAS) had been conducted. Validity determination was measured on the linearity, the limit of detection (LoD) and limit of quantitation (LoQ), accuracy (%R), and precision (%RSD). The correlation coefficient linearity of the standard Cu curve, LoD, and LoQ were 0.9996, 0.0440 mg/L, and 0.1402 mg/L, respectively. Accuracy measurement had been carried out by calculating the percent recovery (%R) of 101.43%. Precision (%RSD) measurement was 1.93%. The copper concentration in sediment CRM BCR 667 was 58.63 mg/kg. This result was not significantly different from the Cu concentration in certificate of 60 mg/kg. It is concluded that determination of copper dry digestion with Na2O2 was valid in sediment analysis. [ABSTRACT FROM AUTHOR]

Published
2022
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16. Potensi Bayam Duri Amaranthus spinosus L. sebagai Tanaman Hiperakumulator Ion Logam Tembaga Cu2+

Author

Syahril, Rahmi Mukhlisah, Nafie, Nursiah La, and Liong, Syarifuddin

Subjects
tembaga, bayam duri, fitoremediasi, hiperakumulator
Abstract

Limbah Cu yang bersumber dari aktivitas industri memiliki sifat toksik dalam tubuh yang menyerang organ hati, otot dan tulang. Pengolahan limbah Cu dapat dilakukan dengan teknik fitoremediasi menggunakan tanaman bayam duri. Kandungan protein dalam bayam duri yang mengandung gugus polar amina (-NH2), gugus karboksil (-COOH), juga gugus sulfidril (-SH) dapat mengikat logam berat. Tujuan penelitian ini adalah untuk mengetahui kemampuan bayam duri mengakumulasi logam Cu dan mekanisme fitoremediasi yang digunakan. Dalam penelitian ini dilakukan secara duplo dan satu tanaman kontrol dengan menggunakan variasi waktu panen 2, 4, 6 dan 8 minggu. Konsentrasi logam Cu pada jaringan tanaman dianalisis dengan menggunakan spektrofotometri serapan atom (SSA). Hasil penelitian menunjukkan bahwa konsentrasi penyerapan logam terbesar pada pekan kedua yaitu 259,65 mg/kg. Nilai faktor biokonsentrasi < 1 dan faktor translokasi > 1. Berdasarkan data ini bayam duri memiliki mekanisme fitoremediasi yaitu fitoekstraksi.

Published
2015

17. Distribusi Kuantitatif Logam Berat Kadmium (Cd) dalam Air, Sedimen dan Ikan Merah (Lutjanus Erythroperus) di Perairan Pelabuhan Parepare

Author

Lestari, Ayu Andriana and Nafie, Nursiah La

Subjects
Kadmium, Sedimen, Adisi standar, SSA Ikan merah (Lutjanus erythropterus)
Abstract

Studi ini bertujuan untuk mengetahui konsentrasi dan bagaimana distribusi logam berat Cd dalam air, sedimen dan ikan merah (Lutjanus erythropterus).Sampel air, sedimen dan ikan merah (Lutjanus erythropterus) di ambil dari 3 stasiun yang berbeda-beda Stasiun 1 berada 3,41 km dari pelabuhan Parepare dan jauh dari pemukiman, stasiun 2 berada 751 m dari pelabuhan dan dekat dari pemukiman dan pelabuhan dan stasiun 3 berada 1,5 km dari pelabuhan dan berada dekat pasar tradisional. Metode analisis yang digunakan yaitu metode standar adisi dengan pengukuran menggunakan Spektrofotometer Serapan Atom. Diperoleh konsentrasi logam berat Cd pada air berkisar antara 0,72 ??? 0,88 mg/L, pada sedimen berkisar antara 41,95??? 68,76 mg/kg berat kering sedimen dan pada sampel ikan merah (Lutjanus erythropterus) berkisar antara 46,22 -49,84 mg/kg berat kering ikan. Distribusi logam berat Cd tertinggi diperoleh pada sampel sedimen. Konsetntrasi yang diperoleh dapat menjelaskan bahwa periaran pelabuhan Parepare telah tercemar oleh logam berat Cd dan melewati ambang batas yang diperbolehkan.

Published
2014

22. Direct synthesis of mesoporous TiO2 using PVA as surfactant template and assessment of their photocatalytic activities

Author

Thahir, Ridhawati, Bangngalino, Herman, Wahid, Abdul, Nafie, Nursiah La, and Raya, Indah

Abstract

Mesoporous TiO2 with the visible-light active photocatalyst activity in methylene blue adsorption and Cu(II) ions were effectively synthesized using PVA as a surfactant template through hydrothermal treatment. The preparation of mesoporous TiO2 was identified by X-ray diffraction (XRD), nitrogen adsorption, and scanning electron microscopy (SEM) with EDX. The results nitrogen adsorption on TiO2 indicate the presence of mesoporous materials type IV with H2-type hysteresis loop with specific surface area 106 m2/g, pore volume 0.18 cc/g, and pore diameter 11 nm. XRD analysis was obtained anatase phase with tetragonal structure. It was observed that the SEM morphology indicated of mesoporous TiO2 were successful. In addition, the performance of a photocatalytic activity in methylene blue and Cu(II) ions physisorption as a model organic and inorganic pollutants was 96 mg/g and 1620 mg/g. The findings of this study suggest that it is surprising to clear the environment by degradation treatment of wastewater.

Published
2019

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