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All Journal VALENSI JURNAL KIMIA SAINS DAN APLIKASI The Journal of Pure and Applied Chemistry Research Jurnal Fisika Unand Jurnal Riset Kimia Jurnal Kimia dan Kemasan Jurnal Litbang Industri Indonesian Journal of Chemistry Akta Kimia Indonesia Molekul: Jurnal Ilmiah Kimia Warta Pengabdian Andalas: Jurnal Ilmiah Pengembangan Dan Penerapan Ipteks Jurnal Kimia dan Kemasan Jurnal Litbang Industri Journal Of Research and Education Chemistry (JREC) Jurnal Katalisator Bulletin of Chemical Reaction Engineering & Catalysis Jurnal Kimia Unand

Wellia, Diana Vanda

Andalas University

Author-ID : 557868

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Earth & Planetary Sciences Education Electrical & Electronics Engineering Energy Engineering Industrial & Manufacturing Engineering Materials Science & Nanotechnology Medicine & Pharmacology Physics Social Sciences Other

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SINTESIS PERMUKAAN KACA HIDROFOBIK MELALUI KOMBINASI TiO2/ASAM STEARAT UNTUK APLIKASI MATERIAL SELF-CLEANING Diana Vanda Wellia; Febby Alvionita; Syukri Arief
Journal of Research and Education Chemistry Vol. 2 No. 1 (2020): April
Publisher : UIR Press

The surface of ultrahydrophobic glass has been successfully prepared using the combination of TiO2 and stearic acid. TiO2 was used to increase the surface roughness, while stearing acid was a surface modifier. The peroxo sol-gel method has been used to synthesize TiO2 precursors on the glass layer followed by modification of stearic acid. The maximal water contact angle of 141o has been obtained for the composition of 0.4 grams of stearic acid and 20 mL of ethanol (NKTS-2%). AFM analysis showed the roughness of NKTS-2% is 4,15 nm, which was greater than the pure glass. FTIR analysis also showed vibration of C=O (carbonyl) at 1697cm-1 indicating the chemical interaction between TiO2 and stearic acid. EDX spectrum analysis of TiO2/stearic acid (TiO2/C18H36O2) showed the existence of titanium, oxygen, and carbon. The optimum sample (NKTS-2%) showed a good transparency and self-cleaning properties compared to pure glass

A New Combination Method of N-doped TiO2 Nanoparticles Synthesis for Heavy Metal Ions Cr(VI) Photoreduction Applications Diana Vanda Wellia; M. Rafli Habibillah; Atika Syafawi; Rizka Rahmadini; Rahmayeni Rahmayeni; Nurul Pratiwi
Jurnal Kimia Sains dan Aplikasi Vol 26, No 2 (2023): Volume 26 Issue 2 Year 2023
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14710/jksa.26.2.70-78

Through a combination of biosynthetic and hydrothermal methods, N-doped TiO2 photocatalyst has been successfully synthesized using various concentrations of ammonia as a nitrogen source, namely 10% w/w (NTO10), 20% w/w (NTO20), 35% w/w (NTO35), and 50% w/w (NTO50). The synthesis of TiO2 was conducted using Aloe vera (L) Burm F. rind extract as a natural capping agent via the biosynthetic method, followed by a nitrogen doping process via the hydrothermal method. The X-ray Diffraction (XRD) analysis revealed that all phases were anatase. According to the results of the UV-Vis Diffuse Reflectance Spectroscopy (UV-Vis DRS) analysis using the Tauc-Plot method, all N-doped TiO2 samples showed a decrease in the energy gap compared to the TO sample. This indicates that the doping of TiO2 using nitrogen has been successfully doped into TiO2. The photocatalytic activity of N-doped TiO2 was evaluated for the photoreduction of the Cr(VI) model pollutant using a 24-watt LED lamp as a visible light source for 120 minutes. The results indicate that the NTO35 is the best-prepared N-doped TiO2, which showed a reduced rate for the Cr (VI) model pollutant of 50.88%, or two times greater than that of undoped TiO2.

THE USE OF TiO2/ZEOLITE TO REDUCE THE CONCENTRATION OF NITRATE, NITRITE, AMMONIAC, PHOSPHATE, BOD, COD AND pH IN AGRICULTURAL WASTE WATER PHOTOLYSIS Zilfa Zilfa; Rahmayeni Rahmayeni; Diana Vanda Wellia; Yulizar Yusuf; Putri Julanda Ardica; Siti Zahara; Muhammad Hafiz Reza
JURNAL KATALISATOR Vol. 7 No. 2 (2022): jurnal Katalisator Volume 7 No 2, Oktober 2022
Publisher : LLDIKTI X Sumbar, Riau, Jambi, Kepri

This study aims to determine the effect of the use of TiO2/Zeolite on reducing concentrations of nitrate, nitrite, ammonia, phosphate, BOD, COD and pH in agricultural wastewater by photolysis. In this study, sample analysis was carried out using UV-Vis spectrophotometer and FTIR and for the characterization of TiO2/Zeolite catalysts using FTIR, XRD and SEM. In agricultural wastewater samples, the initial concentration of nitrate was 11,409 mg/L, nitrite was 0,424 mg/L, ammonia was 5,075 mg/L and phosphate was 5,364 mg/L. The most optimum decrease in concentration for nitrate, nitrite, ammonia and phosphate, respectively, was 4,332 mg/L with an irradiation time of 90 minutes; 0,118 mg/L with an irradiation time of 75 minutes; 0.395 mg/L with an irradiation time of 90 minutes and 1,207 mg/L with an irradiation time of 60 minutes on the addition of TiO2/Zeolite as much as 0.8 grams for the determination of nitrate and phosphate while for nitrite and ammonia as much as 0.6 grams. Prior to the degradation, the BOD value was 62,4 mg/L and the COD value was 107,07 mg/L. Meanwhile, after degradation, the BOD value decreased to 5,92 mg/L and COD to 35 mg/L. The results of the analysis using FTIR on agricultural wastewater show that there is no significant shift in wave number before and after degradation. The characterization of TiO2/Zeolite catalyst using FTIR, XRD and SEM did not show significant changes before and after the degradation process was carried out which indicated that TiO2/zeolite could be applied in degrading agricultural wastewater.

SINTESIS CERIA BERPORI MENGGUNAKAN KOMBINASI CTAB DAN PVA SEBAGAI PROTECTING ETCHING GEBBY FEBRILIA IRWANDA; Diana Vanda Wellia; Gusliani Eka Putri; Arniati Labbani; SYUKRI ARIEF
JURNAL KATALISATOR Vol. 8 No. 1 (2023): Jurnal Katalisator Volume 8 No. 1, April 2023
Publisher : LLDIKTI X Sumbar, Riau, Jambi, Kepri

Penelitian ini bertujuan untuk mensintesis Ceria berpori yang telah menarik banyak minat dalam aplikasinya di bidang katalisis karena memiliki siklus redoks yang unik (Ce3+/Ce4+), luas permukaan yang besar, ukuran pori teratur, dan difusi yang selektif dalam pori-pori. Struktur berpori Ceria dapat disintesis melalui proses protecting etching dengan kombinasi CTAB dan PVA sebagai protecting agent. Dibandingkan dengan penelitian sebelumnya yang terbatas dan hanya dilakukan pada logam silika, metode ini memiliki beberapa keunggulanya itu kompatibilitas untuk oksida logam yang berbeda khususnya logam transisi, reaksi satu pot tanpa prosedur multi-langkah, sintesis cepat (10 menit) dalam proses etching hingga membentuk produk berpori. Hasil analisis morfologi permukaan dengan SEM menunjukkan bahwa Ceria hasil sintesis dengan menggunakan CTAB sebagai templating agent memiliki permukaan yang berpori dan bentuk yang mengarah seperti batang (rod) serta memiliki ukuran partikel yang lebih kecil dibandingkan Ceria hasil sintesis tanpa CTAB sebagai templating agent. Hal tersebut membuktikan bahwa kombinasi CTAB sebagai templating agent dan PVA sebagai protecting agent selama proses etching dapat mengopatimalkan pembentukan struktur berpori pada Ceria sehingga dapat berpotensi iuntuk aplikasi katalitiknya.

Bimbingan dan Pelatihan Fermentasi Pakan untuk Budidaya Ikan Lele dengan Probiotik sebagai Upaya Peningkatan Hasil Produksi Masyarakat di Koto Luar, Kecamatan Pauh, Padang Syafrizayanti Syafrizayanti; Rahmayeni Rahmayeni; Mai Efdi; Yeni Stiadi; Syukri Syukri; Yulia Eka Putri; Diana Vanda Wellia; Tio Putra Wendari; Admi Admi; Emil Salim; Geliz Luh Titisari; Famella Azhara
Warta Pengabdian Andalas Vol 30 No 1 (2023)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat (LPPM) Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jwa.30.1.40-46.2023

The use of feed in fish farming is often inefficient because fish only partially consume the feed spread in ponds, so it becomes waste for the aquatic environment and, even worse, will trigger new diseases. The Department of Chemistry's of Universitas Andalas team was trying to overcome this problem by increasing the efficiency of fish feed. For the feed to work optimally and produce good quality fish weight, it is necessary to modify the nutrition of the fish feed, one of which is by adding probiotics through a fermentation process. The method used in this activity includes training, mentoring, and demonstration plots in feed fermentation and counselling regarding the right time to feed. This activity targets fish farmers in the Koto Luar area, Pauh District, Padang, with a fish culturing group, "Family Sepakat", as the partner. Feed fermentation was carried out with probiotic starters such as Bacillus sp., saccharomyces cerevisiae, L. fermentum, L. plantarum, and W. paramesenteroides. This activity improved catfish growth, and the death rate was lower than in catfish farming without feed fermentation treatment.

Synthesis of Porous N-doped TiO2 by Using Peroxo Sol-Gel Method for Photocatalytic Reduction of Cd(II) Diana Vanda Wellia; Dina Nofebriani; Nurul Pratiwi; Safni Safni
Bulletin of Chemical Reaction Engineering & Catalysis 2022: BCREC Volume 17 Issue 1 Year 2022 (March 2022)
Publisher : Masyarakat Katalis Indonesia - Indonesian Catalyst Society (MKICS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.9767/bcrec.17.1.12347.103-112

Porous N-doped TiO2 photocatalyst was successfully synthesized by an environmentally friendly peroxo sol-gel method using polyethylene glycol (PEG) as a templating agent. Here, the effect of PEG addition to the aqueous peroxotitanium solutions on the structure, pore properties and photocatalytic activity of the obtained photocatalysts was systematically studied. The prepared photocatalysts were characterized by X-ray diffraction (XRD), UV-Vis diffuse reflectance spectroscopy (DRS), and Brunauer-Emmett-Teller (BET). It was found that the doping of nitrogen narrows the band gap of TiO2 leading to enhance its visible-light response. The BET analysis shows that the prepared photocatalysts have a typical mesoporous structure with pore sizes of 3–6 nm. The photocatalytic activity of the prepared photocatalysts was evaluated by photocatalytic reduction of Cd(II) in an aqueous solution under visible light irradiation. The results show that porous N-doped TiO2 with the optimal PEG addition had the highest Cd(II) reduction of 85.1% after 2.5 h irradiation in neutral aqueous solution. This significant improvement in photocatalytic activity of the prepared photocatalysts was mainly attributed to the synergistic combination of N doping and porous structure, which could actively increase the catalytic active site of this photocatalysts. Copyright © 2021 by Authors, Published by BCREC Group. This is an open access article under the CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0).

Sintesis Nanopartikel Titanium Dioksida (TiO2) dengan Menggunakan Ekstrak Kulit Jeruk Gunung Omeh dan Karakteristiknya Diana Vanda Wellia; Shelvira Edelwita; Yulia Eka Putri
Jurnal Kimia Unand Vol. 11 No. 2 (2022): November 2022
Publisher : Departemen Kimia Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jku.11.2.22-30.2022

In this study, TiO2 nanoparticles were synthesized without adding extract (0% v/v) (control) and with the addition of Gunung Omeh orange peel extract with various concentration, namely 4% v/v, 10% v/v, and 20% v /v. This study aims to study the use of Gunung Omeh orange peel extract on the formation of TiO2 nanoparticles and determine its characteristics. The characteristics of the resulting nanoparticles were characterized using X-Ray Diffraction (XRD), Diffuse Reflectance Spectroscopy, Ultraviolet-Visible (DRS UV-Vis), Scanning Electron Microscopy-Energy Dispersive X-Ray (SEM-EDX), Brunauer-Emmett-Teller (BET), Fourier Transform Infrared (FTIR), and Thermo Gravimetric and Differential Thermal Analyzer (TG-DTA). XRD results showed that the TiO2 phase formed was anatase. The optical property of TiO2 nanoparticles showed that the obtained TiO2 nanoparticles absorb in the UV region (200-400 nm). The results of SEM-EDX show that the resulting TiO2 nanoparticles are spherical. Meanwhile, the TOKJ20 sample has increased agglomeration so that the particle shape is rod-like. The EDX spectrum showes the presence of Ti and O peaks indicated the formation of TiO2. The results of BET measurement showed that the control TiO2 had a larger surface area of 66.11 m2/g compared to TiO2 using the addition of other orange peel extracts. From the results obtained, it was concluded that, in general, the addition of orange peel extract did not significantly affect the formation of TiO2 nanoparticles.

Sintesis Lapis Tipis SrTiO3 dengan Metode Solvotermal Melvi Muharmi; Yulia Eka Putri; Diana Vanda Wellia
Jurnal Kimia Unand Vol. 11 No. 2 (2022): November 2022
Publisher : Departemen Kimia Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jku.11.2.31-35.2022

SrTiO3 thin layer were synthesized through solvothermal method by using FTO (fluorine-doped tin oxide) glass as a conductive substrate. The raw materials strontium nitrate (Sr(NO3)2) and titanium tetra isopropoxide (TTIP) were dissolved in ethanol solvent. Sample purity, elemental compositions and surface morphology were characterized using x-ray diffraction (XRD), energy dispersive x-ray (EDX) and scanning electron microscopy (SEM). XRD analysis showed that the synthesized SrTiO3 thin layer at 200oC for 24 hours with the addition of CTAB and TBA had intensity peaks that mathced the SrTiO3 standard (ICSD #94573) with perovskite structure. This result was supported by the XRD pattern of the sample powder. The EDX spectrum showed that titanium and oxygen were in the sample, but the presence of strontium was not found, due to its weak intensity. Based on the SEM image, the morphology seen is distributed equally and the grain size is rather smaller in the sample with the addition of CTAB and TBA.

Characterization Study of Dyes Photodegradation-Adsorption Products by TiO2-Chitosan Immobilized on Glass Beads using Flow System Mahadika, Bella Sukma; Saefumillah, Asep; Saepurahman, Saepurahman; Kurnia, Kiki Adi; Wellia, Diana Vanda
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 9, No. 1, May 2023
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v9i1.31855

Dyes have a complex molecular structure that is difficult to degrade and can persist for a long time in water bodies. This study examines more thoroughly the effectiveness of photodegradation-adsorption of dyes, kinetic aspects, isotherms, thermodynamics, identification of the structure of photodegradation products, and changes in environmental quality parameter values whose results are quite satisfactory. The combination of photodegradation-adsorption of dyes by TiO2-chitosan modified glass beads using a flow system has never been accomplished before. Flowing of the dye resulted in a dye degradation efficiency of 99%. The FESEM-EDX analysis shows that TiO2-chitosan has been coated onto the surface of the glass beads. R2 of kinetics MB, MO, RB are 0.99234, 0.9889, 0.9971, which were pseudo-first order. Qm, KL, R2 are 6.4382, 0.70533, 0.99923; 16.7364, 1.42059, 0.98816; 6.0078, 1.06973, 0.99889, respectively. The ∆H, ∆S, ∆S of -9.388, -0.024, -1.979; -27.182, -0.078, -3.592; -4.819, -0.017, 0.464 indicate the exothermic and spontaneous reaction. COD, TOC, pH, turbidity values have reached the threshold required by the government. The degradation products formed during the photodegradation-adsorption process were identified using LC-MS that the structure of the dye has been degraded to become simpler so that it is safely disposed of into the environment.

Synthesis and Characterization of Hydroxyapatite/Alginate Composites: Study of pH and Sintering Influenced on the Structural, Morphological, and Clindamycin Release Behavior Wulandari, Wulandari; Islami, Dini Muthi'ah; Jamarun, Novesar; Wellia, Diana Vanda; Emriadi, Emriadi
Indonesian Journal of Chemistry Vol 24, No 2 (2024)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.84558

The hydroxyapatite/alginate (HAp/Alg) composite was synthesized using an in-situ precipitation route. The effect of pH (8, 9, 10, and 11) and calcination temperature (300, 500, 700, and 900 °C) were studied by characterization techniques such as X-ray diffraction (XRD), Fourier-transform infrared (FTIR), and scanning electron microscopy with energy-dispersive X-ray (SEM with EDAX). XRD results show the hexagonal crystal system of HAp for each pH value and the biphase (HAp and whitelockite) for the sintering temperature at 700 and 900 °C. The FTIR spectra show no impurity peaks. SEM images revealed spherical-like (HAp/Alg-11) and flake-like (HAp/Alg-900) particles with good homogeneity, size, and shape that could be notable for biomedical utilization, such as drug delivery material. Drug loading and release ability of pure HAp, HAp/Alg-11, and HAp/Alg-900 composites have been investigated with clindamycin hydrochloride as the drug model. The maximum clindamycin HCl release from HAp, HAP/Alg-11, and HAp/Alg-900 reached 74.48, 92.75, and 69.65% in the 8th hour. HAp/Alg-11 has the highest release because it has the largest surface area of 162.584 m2/g. Antibacterial test results showed HAp/Alg-11 has antibacterial activity against Staphylococcus aureus and Escherichia coli, confirming that HAp/Alg-11 composite has the potential to be applied as drug delivery.

Co-Authors Adlis Santoni Admi Admi Alvionita Alvionita Anggraini, Deby Arifah Mustaqimah Arifah Mustaqimah Arniati Labbani Asep Saefumillah Atika Syafawi Attalario, Evan Atthar Luqman Ivansyah Benny Hidayat Deby Anggraini Dina Nofebriani Dwi Syukur Phameswari Dwitami, Aisyah Rahma Dytta Fitria Elida Mardiah Emil Salim Emriadi - Famella Azhara Febby Alvionita GEBBY FEBRILIA IRWANDA Geliz Luh Titisari Gumilang, Yuza Ahmad Ilahi, Fitratul Islami, Dini Muthi'ah Izzah, Annisaul Jarnuzi Gunlazuardi K Khoiriah Khoiriah Khoiriah Khoiriah Khoiriah Khoiriah Khoiriah Khoiriah Khoiriah Khoiriah Khoiriah, Khoiriah Kiki Adi Kurnia Kusumawati, Yuly M. Rafli Habibillah Mahadika, Bella Sukma Mai Efdi Matlal Fajri Alif Melvi Muharmi Merida Saputri Muhammad Hafiz Reza Muldarisnur, Mulda Nova Andriani Nova Andriani Novesar Jamarun Novianti, Noni Nurhasni Nurhasni Nurul Pratiwi Putri Julanda Ardica Putri, Gusliani Eka Rahma, Resha Mutia Rahmadhini Anwar Rahmayeni Rahmayeni Rahmayeni Rahmiana Zein Ramona, Fransischa Ratesha Najela Rathesa Najeela Refilda Refilda Refinel - Reza Audina Putri Reza Audina Putri Rini Rahma Yanti Rizka Rahmadini RR. Ella Evrita Hestiandari Saepurahman, Saepurahman Safni Safni Shelvira Edelwita Siti Zahara Syafrizayanti Syafrizayanti Syukri Syukri Syukri Syukri Thalabul Ilmi Tio Putra Wendari Upita Septiani Upita Septiani Vanny Yulia Safitri Vepilia Wulanda Wulandari Wulandari Wulandari Wulandari Wulandari Wulandari Yanni, Rahma Yefrida Yefrida Yeni Stiadi Yuli Okta Fitriyani Yulia Eka Putri Yulia Eka Putri Yulia Eka Putri, Yulia Eka Yulizar Yusuf Zilfa Zilfa Zulhadjri Zulhadjri

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