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All Journal VALENSI SAINS DAN MATEMATIKA JURNAL KIMIA SAINS DAN APLIKASI Jurnal Sains Dasar Bulletin of Chemical Reaction Engineering & Catalysis Elkawnie Indonesian Journal of Chemistry ASEAN Journal of Chemical Engineering Jurnal Abdimas Perbanas Greensphere: Journal of Environmental Chemistry Bulletin of Chemical Reaction Engineering & Catalysis JURNAL REKAYASA KIMIA & LINGKUNGAN Jurnal Wicara Desa
Adi Darmawan
Chemistry Department, Faculty Of Sciences And Mathematics, Diponegoro University, Jl. Prof. Soedarto, SH., Tembalang, Semarang|Diponegoro University|Indonesia
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SYNTHESIS OF MEMBRANES FROM PILLARED CLAY FeCl3 FOR SEAWATER DESALINATION APPLICATION Muslimin, Muslimin; Darmawan, Adi; Lusiana, RA.
Jurnal Sains Dasar Vol 7, No 1 (2018): April 2018
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (421.888 KB) | DOI: 10.21831/jsd.v7i1.22260

Abstract

Synthesis of membranes has been done using pillared clay FeCl3for desalination application. Pillared clays FeCl3were synthesized via a sol-gel method using [OH] / [Fe] 0.25, 0.5, 1, 2, 2.5. Formed sol-gel was furnace  on 600oC for 2 hours. The membranes which were cooled at room temperature for 3 days then tested filtration of seawater. The results showed that membrane pillared clays FeCl3 with a ratio [OH] / [Fe] 0.25  reached filtration purity 99.99% with the initial TDS 27.58 ppm and  resulted rejection TDS 00.22 ppm after filtration. Membrane with ratio [OH] / [Fe] 0.5 reached filtration purity 80%, with initial TDS   27.58 ppm  and resulted rejection TDS  11.76 ppm,  while membranes with ratio [OH] / [Fe] 1,2 and 2,5 was broken during the filtration proces, its resulted very small rejection. Keywords: membrane, pillared clay, FeCl3, Seawater desalination
PENGARUH PERLAKUAN HCl PADA KRISTALINITAS DAN KEMAMPUAN ADSORPSI ZEOLIT ALAM TERHADAP ION Ca2+ Pardoyo, Pardoyo; Listiana, Listiana; Darmawan, Adi
JURNAL SAINS DAN MATEMATIKA Volume 17 Issue 2 Year 2009
Publisher : JURNAL SAINS DAN MATEMATIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (4266.39 KB)

Abstract

ABSTRACT--It has been done a research to determine  the  influence of hydrochloric acid treatnent to the crystalinity and adsorption capability of natural zeolite to Ca2+ ion.  Activation  process was conducted by refluxing  of  zeolite  with  KMnOa  0.5 M  and HCI  (1:1)  for  4  hours with  temperature of  80"C.  The  various concentration  of HCI  soltrtions  used were 4 M  (AZl),  6 M  (AZZ),8  M  (AZ3)  and l0  M  (AZA). Crstalinity of zeolite  was  identified  by  X-Ray  Diftaction  CXRD) while  the amount of  adsorbed Ca2*  ion was measured  by Atomic  Absorption  Spectroscopy  (AAS).  The activated zeolite was applied  to  adsorb calcium metal  ion  using shaker for  5, 15, 60, 90 dan 120 minutes. The results showed  that the increasing of HCI  concentration for  zeoliteactivation  caused  the  decreasing of  crystallinity  of  NZ,  AZl,  AZ2,  AZ3  wrd AZ1  nunely  100%;  101.10%; 9l.9lo/o;  84.93o/o  and 77  .45o/o  respectively. The adsorption percentage.  of Ca2*  ion  from  conc,entration  originally698 ppm (within  60 minutes)  for NZ,  AZl,  AZ2,  AZ3  and AZ,4 was successively  10.75 Vo;  20.91o/o;  l:4.610/o;19.63% and 24.07o/o.  The results indicated that the decreasing  of  crystallinity  of  zeolite caused  the  increasing of zeolite adsorption ability  to Ca2*  ion.Keywords : zeolite, crystallinity,  adsorption,  ,  Ca2*  ion
Sintesis Lempung Terpilar Titania Darmawan, Adi; Suseno, Ahmad; Purnomo, Slamet Agus
Jurnal Kimia Sains dan Aplikasi Vol 8, No 3 (2005): Volume 8 Issue 3 Year 2005
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (416.936 KB) | DOI: 10.14710/jksa.8.3.61-68

Abstract

Sintesis lempung terpilar Titania dilakukan dengan cara interkalasi larutan pemilar titanium pada lempung dilanjutkan dengan kalsinasi. Suhu kalsinasi divariasi untuk melihat pengaruhnya terhadap basal spacing, stabilitas termal, angka keasaman, situs asam Bronsted-Lewis dan luas permukaan lempung terpilar.Karakterisasi basal spacing dan stabilitas termal menggunakan XRD, angka keasaman dan situs asam Bronsted-Lewis menggunakan adsorpsi piridin/IR dan luas permukaan menggunakan metode adsorpsi gas nitrogen melalui persamaan BET. Hasil analisis menunjukkan bahwa lempung terpilar TiO2 mempunyai basal spacing 17,80 Ǻ, stabilitas termal pada suhu 200oC, keasaman 2,3575 mmol/gram, keberadaan situs asam Bronsted-Lewis seimbang dan luas permukaannya 169,151 m2/g .Hasil ini menunjukkan karakter dari lempung terpilar TiO2 untuk kepentingan adsorpsi atau katalis akan lebih maksimal. Sehingga lempung terpilar TiO2 siap untuk aplikasi lebih lanjut sesuai kebutuhan yang diinginkan.
Koagulasi Pewarna Indigo Karmina (Disodium-3,3’-dioxo-2,2’-bi-indolylidene-5,5’-disulfonat) dengan Metode Elektrolisis Menggunakan Anoda Seng Darmawan, Adi; Suhartana, Suhartana; Kristinawati, Leny
Jurnal Kimia Sains dan Aplikasi Vol 9, No 1 (2006): Volume 9 Issue 1 Year 2006
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (371.524 KB) | DOI: 10.14710/jksa.9.1.22-28

Abstract

Zat warna indigo karmina merupakan salah satu senyawa organik yang digunakan dalam proses pewarnaan tekstil. Zat warna ini menghasilkan limbah cair yang mengakibatkan pencemaran dan kerusakan lingkungan. Sementara seng sisa juga mudah ditemukan. Elektrolisis merupakan suatu metode yang digunakan untuk memanfaatkan kembali kedua limbah tersebut. Logam seng dimanfaatkan sebagai elektroda untuk mendekolorisasi pewarna indigo karmina. Elektrolisis dilakukan selama 7 menit dan tegangan eksternal 6 Volt dengan variasi pH dan temperatur. Hasil elektrolisis dianalisis dengan Spektrofotometer UV-Vis. Hasil penelitian menunjukkan bahwa elektrodekolorisasi dipengaruhi oleh pH dan temperatur. Elektrodekolorisasi pewarna indigo karmina efektif dilakukan pada pH asam yaitu 4 dengan persen dekolorisasi 94,52% dan pada temperatur 70oC dengan persen dekolorisasi 98,09 %.
Sintesis Xilitol dengan Proses Elektroreduksi Xilosa Darmawan, Adi; Rahmanto, Wasino Hadi
Jurnal Kimia Sains dan Aplikasi Vol 1, No 1 (1998): Volume 1 Issue 1 Year 1998
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (3732.313 KB) | DOI: 10.14710/jksa.1.1.15-22

Abstract

Proses produksi xilitol secara elektrokatalitik dari D-xilosa daiam larutan sodium sulfat menggunakan timbal amalgam telah dipelajari. Produk yang dihasilkan ditentukan memakai HPLC. Katoda timbal amalgam digunakan untuk mempertinggi rendemen relatif faraday pada produksi xilitol melalui reaksi hidrogenasi katalitik heterogen dengan Hads. Pada densitas arus rendah dan konsentrasi D-xilosa yang tinggi. rendemen relatif Faraday meningkat. Tidak banyak perbedaan jumlah xylitol yang dihasiikan akibat variasi pH. Produk samping dalam jumlah yang sedikit juga dihasilkan
Dealuminasi Zeolit Alam Cipatujah Melalui Penambahan Asam dan Oksidator Sriatun, Sriatun; Darmawan, Adi
Jurnal Kimia Sains dan Aplikasi Vol 8, No 2 (2005): Volume 8 Issue 2 Year 2005
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (274.435 KB) | DOI: 10.14710/jksa.8.2.55-60

Abstract

Sampai saat ini zeolit tetap menjadi primadona sebagai bahan penapis molekuler atau adsorben. Umumnya zeolit alam perlu diberi perlakuan tertentu bila akan digunakan sebagai adsorben, karena rasio Si/Al rendah dan mengandung unsur-unsur pengotor yang harus diminimalkan pengaruhnya. Oleh karena itu perlu dilakukan dealuminasi. Salah satu metode dealuminasi adalah pengasaman dan untuk memaksimalkannya ditambah dengan oksidator KMnO4.Prosedur kerja penelitian ini meliputi dealuminasi zeolit alam Cipatujah menggunakan H2SO4 dan HCl serta ditambah dengan oksidator KMnO4. Selanjutnya dilakukan karakterisasi terhadap zeolit sebelum dan sesudah perlakuan dealuminasi menggunakan spektrofotometer inframerah (IR), difraktometer sinar-x (XRD) dan spektroskopi serapan atom (AAS).Dari hasil interpretasi terhadap data spektra inframerah maupun difraktogram XRD menunjukkan bahwa zeolit alam yang digunakan termasuk jenis mordenit. Dari data penentuan kadar unsur menggunakan AAS diperoleh hasil bahwa pada dealuminasi menggunakan H2SO4 dan KMnO4 mampu menaikkan rasio Si/Al dari 2,852 menjadi 11-12. sedangkan dengan menggunakan HCl rasio Si/Al naik menjadi 9,945.
Hidrorengkah Fraksi Berat Minyak Bumi Menggunakan Katalis Lempung Terpilar Aluminium Berpengemban Nikel Darmawan, Adi
Jurnal Kimia Sains dan Aplikasi Vol 7, No 1 (2004): Volume 7 Issue 1 Year 2004
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (241.412 KB) | DOI: 10.14710/jksa.7.1.6-9

Abstract

Telah dilakukan sintesis dan karakterisasi katalis lempung terpilar aluminium berpengemban nikel dari bahan lempung alam. Sintesis dilakukan dengan interkalasi polikation Al pada suspensi lempung. Lempung terpilar selanjutnya diimpregnasi dengan Ni dan dialiri gas N2, O2 dan H2. Uji aktivitas katalitik lempung terpilar dilakukan terhadap reaksi hidrorengkah fraksi 200-300°C minyak bumi. Analisis fasa cair minyak bumi hasil perengkahan dilakukan dengan menggunakan kromatografi gas. Hasil aplikasi pada hidrorengkah menunjukkan hahwa katalis lempung terpilar dapat melakukan konversi yang baik pada fraksi Cl8-ke atas dan lebih selektif terhadap fraksi C13-C17.
SYNTHESIS OF ADSORBENT MAGNETITE SILICA FUNCTIONALIZED CETYLTRIMETHYLAMMONIUM BROMIDE (CTAB) FROM IRON SAND KLAYAR BEACH PACITAN Endang Sawitri; Choiril Azmiyawati; P Siahaan; Adi Darmawan
Jurnal Sains Dasar Vol 7, No 1 (2018): April 2018
Publisher : Faculty of Mathematics and Natural Science, Universitas Negeri Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (577.536 KB) | DOI: 10.21831/jsd.v7i1.22243

Abstract

Synthesis of Magnetite Silica cetyltrimethylammonium bromide (magsil-CTAB) had been successfully performed using iron sand Klayar beach as a source of natural magnetite, sodium silicate, HCl, and cetyltrimethylammonium bromide (CTAB). Addition of CTAB on silica magnetite was expected to improve the ability of the adsorbent to adsorb polar compounds such as phenols. Synthesis began with the separation of the magnetite from iron sands by separation magnetically done using permanent magnets. Silica coating on magnetite done via sol-gel method with a ratio 1:20 of magnetite and sodium silicate followed by addition of HCl to form a gel. Gel was dried at a temperature of 80 0C and 350 °C for calcination. Results obtained soaked with CTAB solution with a concentration of 0.5 mM; 1 mM; 2 mM and stirred for 24 hours. Binding of silica and magnetite above the CTAB tested by Fourier Transform Infra Red (FTIR). The presence of silica in magnetite indicated by the appearance of spectra at wave number 900 and 3500-3200 cm-1 indicating the presence of a hydroxyl group of silanol and water molecules. Besides the presence of two strong peaks observed around 1100 and 800 cm-1, respectively show the Si-O-Si asymmetric stretching and bending. From the results of spectra could be seen further there were difference intensity of the main peaks for different samples used, especially on the area around 2300 cm-1 to be a group of nitrile (C-N) and about 3700-3500 cm-1 due to the amide (N-H) of the CTAB as expected. Keywords: magnetite, silica, sol-gel, coating, CTAB
Deconvolution of TEOS/TEVS Xerogel by Single or Dual Organic Catalyst Addition Anna Sumardi; Muthia Elma; Aptar Eka Lestari; Zaini Lambri Assyaifi; Adi Darmawan; Isna Syauqiah; Erdina Lulu Atika Rampun; Yanti Mawaddah; Linda Suci Wati
Jurnal Kimia Valensi Jurnal Kimia VALENSI Volume 6, No. 2, November 2020
Publisher : Syarif Hidayatullah State Islamic University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15408/jkv.v6i2.17597

Abstract

Currently, xerogel has been applied as a filtration material, especially in membrane desalination. However, the xerogel matrix structure for desalination have to be designed properly in order to allow rejection of salt and obtain good hydro-stability, thus, silica precursor in the form of TEOS (tetraethyl orthosilicate)/TEVS (triethoxy vinyl silane) and organic acid catalyst are suitable material for fabrication. The aim of this study is therefore to fabricate and perform deconvolution of TEOS/TEVS xerogel by adding single or dual catalyst, using FTIR (Fourier-transform Infrared Spectroscopy) and Fityk software. The xerogel was fabricated by dried silica sol and calcined using RTP technique (rapid thermal processing) at 450 °C.  Prior to this fabrication, the silica sol was synthesized by sol gel method, using a mixture of silica precursor TEOS/TEVS, ethanol solvent, and varied addition of single catalyst (citric acid) as well as dual catalyst (citric acid + ammonia) for 2 hours, at 50 °C. Subsequently, the xerogel was characterized by FTIR and the deconvolution was obtained through Gaussian approach, with Fityk software. All TEOS/TEVS xerogel samples indicated existence of silanol (Si-OH), siloxane (Si-O-Si) and silica-carbon (Si-C) functional groups. The xerogel deconvolution of TEOS/TEVS using single catalyst exhibit a peak area ratio of Si-OH/Si-O-Si, and this is similar to the dual catalyst counterpart of 0.24 (unit area) and 1.86 (unit area), for Si-C area ratio. This shows the addition of single catalyst was enough to produce deconvolution in TEOS/TEVS xerogel, dominated by siloxane functional group and carbon bonds with the ability to enhance membrane material hydro-stability’s fabrication.
Production and Characterization of Adsorbent from Oyster Shell (Crassostrea gigas) Using Physics and Chemical Activation with ZnCl2 and Its Application for Removal of Hexavalent Chromium Lia Handayani; Azwar Thaib; Nurhayati Nurhayati; Yayuk Astuti; Adi Darmawan
Elkawnie: Journal of Islamic Science and Technology Vol 6, No 2 (2020)
Publisher : Universitas Islam Negeri Ar-Raniry Banda Aceh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/ekw.v6i2.7333

Abstract

Abstract: Oyster shell waste has been investigated as a raw material for making adsorbents that will be activated. Physical activation uses temperatures of 500 ºC, 600 ºC, 700 ºC, 800 ºC, 900 ºC and chemical activation uses ZnCl2 with a concentration of 1 %, 5 %, 10 % and 15 %. Based on the analysis of the characteristics that have been carried out for physically activated adsorbents, the oyster shell calcined at 800 ºC produces the best characteristics, it is a radius of 35.11 Å with a percentage of removal of 38.04 %, as well as the results of the FTIR, XRF and SEM analysis gives the best results among others. Whereas for chemically activated adsorbents, the use of activator ZnCl2 10% produces adsorbents with the best characteristics among others with a radius of 84.14 Å and removal percentage of 65.68 %, the best results for adsorbents activated using 10% ZnCl2 are also supported by analysis results given by FTIR, XRF, and SEM.Keywords: Adsorbent; BET; Cr6+; Oyster Shell Waste; XRF Abstrak: Cangkang tiram (Crassostrea gigas) telah diteliti sebagai bahan baku pembuatan adsorben yang akan diaktivasi secara fisika dan kimia. Pembuatan adsorben dengan aktivasi secara fisika menggunakan variasi suhu 500 ºC, 600 ºC, 700 ºC, 800 ºC dan 900 ºC. sedangkan aktivasi kimia yaitu menggunakan aktivator ZnCl2 menggunakan variasi konsentrasi 1 %, 5 %, 10% dan 15 %. Berdasarkan analisa karakteristik yang telah dilakukan untuk adsorben-adsorben yang telah diaktivasi secara fisika, cangkang tiram yang di kalsinasi pada suhu 800ºC menghasilkan karakteristik yang paling baik, yaitu radius pori-pori 35,11 Å dengan persentase penyisihan sebesar 38,04 %, begitu pula dengan hasil analisa FTIR, XRF dan SEM memberikan hasil terbaik diantara yang lain. sedangkan untuk adsorben-adsorben yang diaktivasi secara kimia, penggunaan aktivator ZnCl2 10% menghasilkan adsorben dengan karakteristik yang paling baik diantara lainnya dengan radius pori-pori 84,14 Å dan persentase penyisihan sebesar 65,68%, hasil terbaik untuk adsorben yang diaktivasi menggunakan ZnCl2 10 % juga didukung oleh hasil analisa dari FTIR, XRF dan SEM.
Co-Authors . Widayat Agus Subagio Ahmad Kusumaatmaja Ahmad Suseno Al Aqad, Yuniar Rizki Rahmawati Amara, Nadya Amaryllis Kartika Ratri Andrew Pradana Putra Anna Sumardi Anna Sumardi Aptar Eka Lestari Aptar Eka Lestari Ari Kurniawan Artha Monica Andini Aulia Rahma Aulia Zahra Ekaningsih Azwar Thaib Brainy Happy Ana Tasiman Brigita Maria Listyani Choiril Azmiyawati Cut Rahmawati Dian Anggraini Dimas Buntarto Doddy Bestyan Dwi Rasy Mujiyanti Endang Sawitri Erdina Lulu Atika Rampun Evan Evan Faradina Azahra Zaqia Febio Dalanta Gunawan Gunawan Hakim, Muhamad Shaufil Hanifa Zakiyatul Urbach Hendri Widyandari Heru Susanto Indriana Kartini Isna Syauqiah Isna Syauqiah Khaerunnisa Khaerunnisa, Khaerunnisa Kristinawati, Leny Laksamana, Patria Lathifah Puji Hastuti Lia Handayani Lia Handayani Linda Selvianingrum Linda Suci Wati Linda Suciwati Linda Suyati Listiana Listiana Lusiana, RA. Maranti Sianita Marta Chandra Anikke Putri Muslimin Muthia Elma Nanik Sulistyowati Nurhayati Nurhayati Nurhayati Nurhayati Oktaffi Arina Manasikana P Siahaan Pardoyo Pardoyo Pulojuliadi Nababan Purnomo, Slamet Agus Putra, Muhammad Septian Dwi Putri, Aida Musyarrifah Hasri Rina Nurianingsih Rosmaliati, Rosmaliati Sani, Nabila Aulia Sari, Ainayya Amalia Saripudin Saripudin Silviana Silviana Sriatun Sriatun Sriyanti Sriyanti Suhartana Suhartana Suharyanto Susanto, Oki Novian Trie Nanda Mulyana Wasino Hadi Rahmanto Yanti Mawaddah Yanti Mawaddah Yayuk Astuti Zaini Lambri Assyaifi Zaini Lambri Assyaifi