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PENGARUH KONSENTRASI ASAM TERHADAP SIFAT FISIK DAN MUATAN PERMUKAAN SELULOSA TERMODIFIKASI Pratama, Agus Wedi; Piluharto, Bambang; Indarti, Dwi; Haryati, Tanti; Addy, Hardian Susilo
ALCHEMY Jurnal Penelitian Kimia Vol 15, No 2 (2019): Vol 15, No 2 (2019) Alchemy Jurnal Penelitian Kimia
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.15.2.33756.315-328

Abstract

Selulosa merupakan salah satu biopolimer melimpah yang banyak digunakan dalam berbagai bidang seperti kertas, energi dan material komposit. Hidrofilisitas, dapat diperbaharui, ramah lingkungan dan aman adalah sifat-sifat selulosa yang dapat berpotensi menjadi material maju. Berdasarkan sifat-sifatnya, selulosa dapat dimodifikasi untuk menghasilkan sifat fungsional yang sesuai dengan aplikasinya. Dalam penelitian ini, selulosa mikrokristalin (MCC) dimodifikasi melalui metode hidrolisis asam. Prinsip metode ini adalah penghilangan bagian amorf pada selulosa oleh asam, meninggalkan bagian kristal. Selain itu, ketika asam digunakan sebagai agen hidrolisis, maka akan menghasilkan muatan permukaan pada selulosa. Dalam penelitian ini, pengaruh berbagai konsentrasi asam pada struktur kimia, kristalinitas, morfologi dan muatan permukaan telah dikaji. Perubahan struktur selulosa dianalisis menggunakan Fourier Transform Infra Red (FTIR), kristalinitas menggunakan X-ray Diffraction (XRD), morfologi menggunakan Scanning Electron Microscopy (SEM) dan muatan permukaan menggunakan titrasi konduktomteri. Hasil analisis FTIR menunjukkan masuknya gugus sulfat pada struktur selulosa. Analisis XRD menunjukkan peningkatan kristallinitas dalam selulosa termodifikasi seiring bertambahnya konsentrasi asam. Hasil analisis morfologi menunjukkan partikel dalam selulosa termodifikasi (CM) lebih tersebar daripada MCC. Analisis titrasi konduktometri menunjukkan bahwa mengalami peningkatan muatan permukaan pada CM seiring dengan bertambahnya konsentrasi asam. Oleh karena itu, dapat disimpulkan bahwa pengaruh konsentrasi asam sulfat pada hidrolisis selulosa memberikan dampak yang signifikan pada sifat fisik dan muatan permukaan.Effect of Acid Concentration on Physical Properties and Surface charge of Modified Cellulose. Cellulose is one of abundant biopolymer that many widely used in various applications such as paper, energy and composite material. Hydrophilicity, renewable, biodegradable, and safety are cellulose properties that can became potential of advance materials. In the utilization, cellulose can be modified its properties for different purposes. In this work, microcrystalline cellulose (MCC) was modified by acid hydrolysis method. The principle of this method is removed amorphous region of cellulose by acid and leaving crystalline phase. Moreover, when acid was used as hydrolyzing agent, it produce the surface charge on cellulose. In this research, the effect of various concentration of acid on the chemical structure, crystallinity, morphology and surface charge have studied. The chemical structures were analyzed using Fourier Transform Infra Red (FTIR), crystallinity using X-ray Diffraction (XRD), morphology using Scanning Electron Microscopy (SEM), and surface charge using titration conductometric. The FTIR analysis result has successfully showed the entry of sulfate groups on the cellulose structure. The XRD analysis showed increasing crystallinity in Cellulose Modified (CM) with increase acid concentration. By morphology analysis, particles in CM more disperse than MCC. Analysis of conductometric titration shows that there is an increase in surface charge in CM as acid concentration increases. Thus, the effect of sulfuric acid concentration on hydrolysis of cellulose has a significant impact on physical properties and surface charge.
THE EFFECT OF SOL-GEL TEMPERATURE AND SOLVENT POLYETILEN GLYCOL (PEG) IN ZnO- TiO2 PHOTOCATALYST ACTIVITY AS DEGRADER OF TEXTILE DYEING LIQUID WASTE Haryati, Tanti; Andarini, Novita; Mardhiyah, Siti
Alchemy Jurnal Penelitian Kimia Vol 10, No 2 (2014)
Publisher : Alchemy Jurnal Penelitian Kimia

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Abstract

The use of TiO2 powder as photocatalyst still provides some disadvantages such as the difficulties in regenerate ion, the low adsorption and turbulence. These problems can be overcomed by providing the photocatalyst as a composite of ZnO-TiO2. This research aims to investigate the effect of composition of solvent and temperature of synthesis on the quality and photocatalytic activity of ZnO-TiO2 which was prepared by sol-gel method. The photocatalytic activity was determined by applying the composite in degradation of Procion Red MX-8B under irradition of UV light for 24 hours. The procion red concentration after degradation was determined by UV-Vis spectrophotometer. Meanwhile the effect of synthesis temperature on crystal structure of composite was studied by XRD. The results show that the composite which was prepared by PEG 1500 at 1:4 of moles ratio and at 70oC of synthesis temperature has highest degradation percentage, i.e. 55.375 % and photocataltic activity of 3.561 x 10-7 mg/cm2s.
PENGARUH EKSTRAK KASAR TANIN DARI DAUN BELIMBING WULUH (AVERRHOA BILIMBI L.) PADA PENGOLAHAN AIR Kristianto, Aries; Winata, I Nyoman Adi; Haryati, Tanti
BERKALA SAINSTEK Vol 2, No 1 (2014)
Publisher : My Home

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Abstract

Penelitian tentang pengaruh ekstrak kasar tanin dari daun belimbing wuluh (Averrhoa bilimbi L.) pada pengolahan air telah dilakukan. Ekstrak kasar tanin diperoleh dengan cara maserasi dengan metanol 50% terhadap serbuk kering daun belimbing wuluh (A. bilimbi L.). Selanjutnya ekstrak kasar tanin dikombinasikan dengan koagulan FeCl3 dan FeSO4. Pada pengolahan air parameter yang diamati adalah pH, kekeruhan, padatan terlarut dan daya hantar listrik. Penambahan ekstrak kasar tanin dengan FeCl3 pada kondisi optimum (125 mg/L tanin dan 50 mg/L FeCl3) dapat menurunkan kekeruhan, pH, padatan terlarut dan daya hantar listrik berturut-turut sebesar 72,43%, 47,24%, 86,13% dan 5,44%. Penambahan ekstrak kasar tanin dengan FeSO4 pada kondisi optimum (150 mg/L tanin dan 60 mg/L FeSO4) dapat menurunkan kekeruhan, pH berturut-turut sebesar 6,98%, 25,20%, padatan terlarut tidak dapat didefinisikan dan daya hantar listrik mengalami kenaikan sebesar 5,81%. Pada penambahan tanin tanpa kombinasi koagulan pada kondisi optimum (125 mg/L) dapat menurunkan kekeruhan sebesar 19,14%, pH mengalami kenaikan sebesar 19,33%, dan menurunkan padatan terlarut dan konduktivitas berturut-turut sebesar 69,33% dan 2,70%. Kata kunci: Averrhoa bilimbi L., koagolan, tanin.
Dye-Sensitized Solar Cells (Dssc) Using Natural Dyes Extracted From Red Cabbage And Counter Electrode Based Tio2-Graphite Composites Haryati, Tanti; Mulyono, Tri; Oktavianawati, Ika; Badrianto, Wawan
UNEJ e-Proceeding Indonesian Protein Society (IPS), International Seminar and Workshop 2014
Publisher : UNEJ e-Proceeding

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Abstract

Dye sensitized solar cells (DSSC) has been a popular research topic which benefits in high energy conversion efficiency and less cost in fabrication process. The components of DSSC consist of photoanode, electrolyte, and counter electrode that are arranged as sandwich. The photoanode contains ITO (indium tin oxide) glass covered by TiO2 particles, while the counter electrode contains ITO glass covered by composite of TiO2-graphite as counter electrode and red cabbage extract, as a dye agent. The cell was fabricated in various amount of graphite, i.e 10%; 30%; and 50 %, and time of soaking i.e 2; 13; 24; and 48 hours. The performance of the solar cell per active area of ​​1 cm2 was tested on irradiation of 75 Watt halogen lamp (distance 15 cm) and measured by multimeter and rheostat. The optimum synthesis condition of DSSC was obtained with composition of TiO2:graphite on the counter electrode is 70%:30 %, and soaking time in dye agent is for 24 hours. This cell results in an optimum performance, Isc = 0.028 mA ;Voc = 0.344 mV, FF = 0.29 and = 0.0055 % efficiency. Keywords: DSSC, Red Cabbage, Counter Electrode
FLOW INJECTION POTENTIOMETRIC ANALYSIS OF ASPARTIC ACID, GLUTAMIC ACID AND ASCORBIC ACID USING PLATINUM ELECTRODES Muflihah, Yeni Maulidah; Siswoyo, Siswoyo; Haryati, Tanti; Setianingrum, Kiki Puji
Jurnal ILMU DASAR Vol 13 No 1 (2012)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (314.474 KB) | DOI: 10.19184/jid.v13i1.886

Abstract

The presence of  weak acids in solution can be detected using a potentiometric detector. Platinum was used as a working electrode and Ag/AgCl as a reference electrode. Ascorbic, glutamic and aspartic acid were detected by a platinum electrode in a flow potentiometric system. The influence of pH, flow rate and concentration of phosphate buffers asa a carrier were studied and showed an optimum pH for the detection of ascorbic and glutamic acid at pH 6,5 and pH 7,0 for aspartic acid. Phosphate buffer concentration optimum at 1x10-4M and flow rate of 1,00 mL/min. Linear range for ascorbic and glutamic acid at 2,5 x10-4M to 5x10-2M, with a regression coefficient of  0,974 and 0,958, while for aspartic acid 5x10-4M to 5x10-2M with a regression coefficient 0,911. Detection limit for ascorbic and glutamic acids were 5x10-4M and 1x10-3M for aspartic acid. Sensor reproducibility obtained from variation coefficient  (Kv). Variation coeffiecient (Kv) of ascorbic acids 1,32-1,69%, glutamic acids 0,69- 1,57% and aspartic acid 0,54- 1,29%.
Synthesis and Characterization Thin Film TiO2 as Degrading Procion Red MX-8B Textile Dye Haryati, Tanti; Mulyono, Tri; Almu’minin, Achmad Sholikhudin
Jurnal ILMU DASAR Vol 17 No 2 (2016)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (375.367 KB) | DOI: 10.19184/jid.v17i2.2685

Abstract

TiO2 photocatalyst is one of type semiconductor that is often used in textile dyes photodegradationmethod which characteristics are influenced by the size of crytal. Synthesis of TiO2 photocatalystscan be done by several methods, one using the sol-gel method. By treating variations in thecomposition of the reactans and treatment of synthesis in sol-gel method, the size of the TiO2crystals can be controlled to produced the desired characteristics. This study has been made ofTiO2 photocatalysts in the form of thin-layer films using sol-gel method with annealing process ata temperature of 550oC. This study examines the effect of the concentration of precursor TTIP andhydrolysis ratio of the crystal structure, crystallinity, the band gap energy, and photocatalystactivity to degrade procion red mx-8b dye compound. The result obtained is known that the crystalsynthesized has structure of TiO2 anatase. Value crystal size, crystallinity, the band gap energy,and percent degradation has a value that depends on the composition of TTIP concentration andhydrolysis ratio. Although the results showed morphology of TiO2 particle indivcate that large sizeand crystallinity value is still low, but that is interesting each of the measurement results mutuallysupport each other.Keywords: photocatalyst, TiO2, Sol-gel, TTIP concentration, hydrolysis ratio
SYNTHESIS THIN LAYER ZnO-TiO2 PHOTOCATALYSTS SOL GEL METHOD BY USING THE PEG (Polyethylene Glycol) AS SOLVENT Haryati, Tanti; Andarini, Novita; Febrianti, Mellisa Ika
Jurnal ILMU DASAR Vol 13 No 1 (2012)
Publisher : Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1798.938 KB) | DOI: 10.19184/jid.v13i1.625

Abstract

The incorporation of TiO and ZnO material as a composite, to increase the activity of the catalyst. Synthesis of ZnO-TiO2 thin layer made using a sol-gel method with a variation of PEG as a solvent. The purpose of this research was to investigate the structure and morphology of ZnO-TiO2 thin layer on the variation of PEG as a solvent by sol-gel method . Preparation of ZnO sol of the precursor , while the TiO2 sol synthesized by dissolving the anatase TiO2 structure into polyethilen glycol . Sol of ZnO and TiO2 sol do sol mixing to form ZnO–TiO2 after it coated on a glass substrate and then calcined . Products were then characterized by X-ray diffraction to determine the crystal structure and SEM to determine its morphology . The test results show the crystal structure by XRD based difaktogram intensity , the greater the molecular weight of the PEG peak intensity of ZnO-TiO2 showed the lower. While based on morphological examination , it can be seen that the larger molecular weight PEG , ZnO - TiO2 granular greater.
THE EFFECT OF SOL-GEL TEMPERATURE AND SOLVENT POLYETHYLENE GLYCOL (PEG) IN ZnO- TiO2 PHOTOCATALYST ACT AS DEGRADER OF TEXTILE DYEING LIQUID WASTE Haryati, Tanti; Andarini, Novita; Mardhiyah, Siti
ALCHEMY Jurnal Penelitian Kimia Vol 10, No 2 (2014): Alchemy Jurnal Penelitian Kimia
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.10.2.536.149-156

Abstract

The use of TiO2  powder  as photocatalyst still provides some disadvantages such as the difficulties in regenerate ion, the low adsorption and turbulence . These problems can be overcomed by providing the photocatalyst as a composite of ZnO-TiO2. This research aims to  investigate  the  effect  of  composition  of  solvent  and  temperatureof  synthesis  on  the quality  and  photocatalytic  activity  of  ZnO-TiO2  which  was  prepared  by  sol-gel  method. The  photocatalytic  activity  was  determined  by  applying  the  composite  in  degradation  of Procion  Red  MX-8B  under  irradition  of  UV  light  for  24  hours.  The  procion  red concentration after degradation was determined by UV-Vis spectrophotometer. Meanwhile the effect of synt hesis temperature on crystal structure  of composite  was studied by XRD. The results show that the composite which was prepared by PEG 1500 at 1:4 of moles ratio and at 70  °C of  synthesis temperature has  highest degradation  percentage,  i.e. 55.375 % and photocataltic activity of 3.561 x 10-7mg/cm2s.
Pemurnian Silikon (Si) Hasil Reduksi Silika dari Fly Ash Batubara Andarini, Novita; Haryati, Tanti; Yulianti, Rika
BERKALA SAINSTEK Vol 6 No 1 (2018)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v6i1.7933

Abstract

Fly ash merupakan limbah hasil pembakaran batubara yang mengandung beberapa senyawa kimia yang dapat dimanfaatkan.. Salah satu senyawa kimia dengan persentase tinggi di dalam fly ash adalah senyawa silika (SiO2). Penelitian ini bertujuan untuk mendapatkan silikon murni hasil dari reduksi silika dari fly ash batubara. Silika diperoleh dengan metode ekstraksi yaitu dengan menggunakan NaOH 3M dan HCl 1M, dilanjutkan dengan pemurnian silika menggunakan HCl 37%. Silika murni yang diperoleh kemudian direduksi menggunakan metode metalotermal dengan logam magnesium. Komposisi massa silika dan magnesium yang digunakan dioptimasi dengan empat variasi perbandingan massa silika:magnesium masing- masing 1:0,8 ; 1:1,5; 1:2 dan 1:2,5. Produk optimum hasil dari proses reduksi kemudian dimurnikan menggunakan 150mL HCl 2M lalu dipanaskan pada suhu 80oC sambil distirer selama 3 jam. Hasil analisa XRF (X-Ray fluorescence) menunjukkan persentase kadar silika yang diperoleh dari proses ekstraksi yaitu 79,72% dan meningkat kadar kemurniannya menjadi 93,76% setelah dilakukan pemurnian. Karakterisasi produk dari reaksi reduksi silika oleh magnesium menggunakan XRD dengan program software Match 3 secara keseluruhan terhadap semua variasi massa silika:magnesium menunjukkan bahwa silikon yang dihasilkan hanya diperoleh pada variasi silika:magnesium 1:0,8 yaitu sebanyak 4,8%. Hal ini ditunjukkan dengan munculnya puncak 2 theta pada titik 42.77 o, 48.43o dan 78.39o. Kemurnian silikon kemudian meningkat menjadi 5,6% setelah dilakukan pemurnian.Kata Kunci: fly ash, pemurnian, reduksi, silika, silikon
Sintesis Lapis Tipis Zn1-XNiXO sebagai Material Fotokatalis Pendegradasi Pewarna Tekstil Roziqin, Achmad Zainur; Haryati, Tanti; Andarini, Novita
BERKALA SAINSTEK Vol 6 No 2 (2018)
Publisher : Universitas Jember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.19184/bst.v6i2.9228

Abstract

Limbah cair zat warna dapat didegradasi dengan menggunakan teknik fotodegradasi katalitik menggunakan material semikonduktor dengan bantuan paparan sinar ultraviolet (UV). Salah satu material semikonduktor yang digunakan untuk proses pendegradasian adalah zink oksida (ZnO). Metode sintesis lapis tipis Zn1-xNixO adalah sistem deposisi larutan. Pengaruh dari variasi jumlah penambahan ion dopan Ni 2+ pada sintesis lapis tipis Zn1-xNixO terhadap struktur dan komposisi dikarakterisasi menggunakan X-Ray Diffraction (XRD) dan X-Ray Fluoresence (XRF). Kinerja dari lapis tipis Zn1-xNixO sebagai fotokatalitik dipelajari melalui % degradasi limbah zat cair dalam hal ini menggunakan Procion Red MX8-B. Berdasarkan hasil karakterisasi diperoleh hasil semakin tinggi persentase ion dopan Ni2+ maka semakin tinggi kristanilitas dan semakin kecil ukuran kristal dari lapis tipis Zn1-xNixO. Begitu pula pada aktivitas fotokatalisnya semakin tinggi persentase ion dopan Ni2+ maka semakin tinggi pula persen degradasinya. Aktivitas fotokatalis optimum didapatkan pada lapis tipis dengan komposisi 5% Ni yaitu sebesar 34.5%. Kata Kunci: Lapis tipis Zn1-xNixO, fotodegradasi katalitik, limbah cair zat warna.