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All Journal Eksergi: Chemical Engineering Journal Jurnal Matematika dan Ilmu Pengetahuan Alam Jurnal Kimia Riset JKPK (Jurnal Kimia dan Pendidikan Kimia) Jurnal Abdi: Media Pengabdian Kepada Masyarakat Jurnal Layanan Masyarakat (Journal of Public Service) Berkala Penelitian Hayati

Handoko Darmokoesoemo

Departemen Kimia, Fakultas Sains Dan Teknologi, Universitas Airlangga

Author-ID : 513356

Agriculture, Biological Sciences & Forestry Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Control & Systems Engineering Decision Sciences, Operations Research & Management Education Environmental Science Immunology & microbiology Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Social Sciences Other

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Penentuan Kondisi Optimum Penyerapan Logam Kadmium Oleh Asam Humat Darmokoesoemo, Handoko; Setyawati, Harsasi
Jurnal Matematika dan Ilmu Pengetahuan Alam Vol 17, No 1 (2015)
Publisher : Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (50.452 KB)

This research was study on the formation of complexes between metals Cd(II) with humic acid and the optimum conditions of metal Cd(II) adsorption by humic acid. Determination of optimization conditions of metal Cd(II) adsorption by humic acid i.e. variation of contact time, pH and Cd(II) concentration. The results showed the optimum contact time was 90 minutes with a percentage of Cd adsorped was 86.52%, the pH optimum was pH 6 with a percentage of Cd adsorped was 80.39% and the optimum Cd(II) concentration was 500 ppm with the optimum Cd(II) adsorped by humic acid was 221, 8 mg /L. FTIR analysis showed the presence a bond between the metal Cd(II) with oxygen groups of humic acid at wavelength of 354.90 cm-1. The adsorption model of Cd(II) by humic acids showed Langmuir type with correlation coefficient 0,99909.Keywords : humic acid, cadmium, Cd(II)-humat complexes.

APLIKASI CARBOXYMETHYL CHITOSAN - UREA GLUTARAT (CMCHI - UGLU) SEBAGAI KATALIS TERFLUIDAKAN PADA SINTESIS BIODIESEL DARI VIRGIN COCONUT OIL (VCO) Handoko Darmokoesoemo; Suyanto suyanto; Denny Ika Rahmawati
Jurnal Kimia Riset Vol. 1 No. 1 (2016): Juni
Publisher : Universitas Airlangga

AbstrakPenelitian ini bertujuan untuk mentransformasi kitosan menjadi carboxymethyl chitosanyang selanjutnya diubah menjadi carboxymethyl chitosan urea glutarat (CMChi-UGLU) dan kemudian diaplikasikan sebagai katalis terfluidakan untuk sintesis biodiesel. Selain itu, penelitian ini juga bertujuan untuk menentukan aktivitas katalitik katalis CMChi-UGLU. CMChi-UGLU yang diperoleh dikarakterisasi dengan menggunakan Fourier Transform Infra Red(FTIR) sedangkan biodiesel yang diperoleh dikarakterisasi dengan menggunakan Gas Chromatography-Mass Spectrometry (GC-MS). Sintesis biodiesel dilakukan dengan menggunakan kolom fluidisasi yang diisi denganVirgin Coconut Oil dan metanol (1:60) serta katalis CMChi-UGLU sebanyak 10% b/b minyak selama 90 menit dan pada suhu 65-70°C. Hasil penelitian menunjukkan bahwa aktivitas katalitik katalis CMChi-UGLU adalah 80,046%, hasil ini lebih tinggi dibandingkan katalis chitosan yaitu 40,023%. Kata kunci: kitosan, CMChi-UGLU, fluidisasi, aktivitas katalitik AbstractThis study aims to transforming chitosan into carboxymethyl chitosan which is converted into carboxymethyl chitosan urea glutaric acid (CMChi-UGLU) that will be used as a fluidized catalyst for synthesis biodiesel. In addition, this study aims to determining the catalytic activity of CMChi-UGLU. CMChi-UGLU is characterized by Fourier Transform Infra-Red(FTIR) while biodiesel is characterized by Gas Chromatography-Mass Spectrometry (GC-MS). Synthesis of biodiesel is performed using fluidization column which filled with virgin coconut oil and methanol (1:60) and also heterogeneous catalyst CMChi-UGLU as many as 10% of oil weight on condition within 90 minutes at temperature 65-70°C. The result of synthesis of biodiesel showed that the catalytic activity of CMChi-UGLU is 80,046%, this result is higher than uses chitosan which it’s catalytic activity is 40,023%. Keywords: chitosan, CMChi-UGLU, fluidization, catalytic activity

Pengembangan Elektroda Pasta Karbon termodifikasi Molecularly Imprinted Polymer sebagai Sensor Potensiometri Asam Urat Mirartul Khasanah; Handoko Darmokoesoemo; Nesti Widayanti
Jurnal Kimia Riset Vol. 1 No. 2 (2016): Desember
Publisher : Universitas Airlangga

ABSTRAK Pengembangan elektroda pasta karbon/molecularly imprinted polymer (MIP) sebagai sensor untuk analisis asam urat secara potensiometri telah dilakukan. MIP dibuat dari monomer metil metakrilat, cross-linker etilen glikol dimetakrilat, dan asam urat sebagai template. Elektroda yang memberikan kinerja optimum dibuat dengan komposisi karbon, MIP, dan parafin 40:25:35(%b/b). Pengukuran larutan asam urat dilakukan pada pH optimum 5. Kinerja elektroda dinyatakan dengan nilai faktor Nernst sebesar 30,19 mV/dekade dengan jangkauan pengukuran 10-6-10-3 M, koefisien variasi 1,36-2,03%, akurasi 63,9-166,0 % dan batas deteksi bawah sebesar 3,03x10-6 M. Pengukuran asam urat dengan elektroda ini tidak diganggu oleh keberadaan urea yang ditunjukkan dengan nilai koefisien selektivitas (Kij) kurang dari satu. Elektroda ini memiliki waktu respon kurang dari dua menit dan waktu hidup selama delapan minggu dengan 104 kali pemakaian. Kata kunci: elektroda pasta karbon, MIP, potensiometri, asam urat ABSTRACTCarbon paste electrode modified molecularly imprinted polymer (MIP) as a sensor to analyze uric acid by potentiometry has been developed. MIP was synthesized by mixing methyl methacrylate as monomer, etylene glycol dimethacrylic acid as cross-linker, and uric acid as template. The electrode which showed the best performance was manufactured by ratio of carbon, MIP, and paraffin of 40:25:35 (w/w). The developed electrode showed the optimum performance on the uric acid pH 5. The performances of carbon paste/MIP electrode was expressed by Nernst factor of 30.19 mV/decade, measurement range of 10-6-10-3 M, the coefficient of variation (CV) of 1.36-2.03% and accuracy of 63.9-166.0%. The detection limit of this method was 3.03x10-6 M. Analysis of uric acid using the electrode was not interfered by urea. The developed electrode showed the response time less than 2 minutes, while lifetime of the electrode was 8 weeks (104 times usage). Keyword : carbon paste electrode, MIP, potentiometry, uric acid

STUDI MEKANISME KINETIKA REAKSI PERTUKARAN ION FE(III) ANTARA DUA JENIS LIGAN SIDEROPHORE BAKTERI (DESFERRIFERRIOXAMINE B DAN AZOVERDINE) DENGAN LIGAN EDTA Handoko Darmokoesoemo; A.M. Albrecht Gary
JURNAL PENELITIAN BIOLOGI BERKALA PENELITIAN HAYATI Vol 1 No 2 (1995): December 1995
Publisher : The East Java Biological Society

The kinetics of iron exchange and iron removal from two siderophore complex with use of ethylenediaminetetraacetic acid (EDTA) have been examined, using UV-Vis spectrophotometric method. Iron exchange between the ferric complexes of desferriferrioxamine B (siderophore produced by microorganism Azomonas macrocy-togenes) with EDTA was extremely slow under conditions at pH 7.4 and 25oC. Furthermore, pH dependence studies demonstrated that the exchange rate was accelerated as a function of increasing hydrogen ion concentration. Kinetics of iron removal from ferrioxamine B and the ferric complexe of azoverdine with excess of EDTA, show firt-order dependence on the concentration of the iron complex and hydrogen ion at 25oC with first-order rate constant of the dissociation of a ternary complex formed of (16 ±0.4) x 10-3s-1 and (1.3 ±0.2) x 10-2s-1 respectivy at pH region between 3.67 and 5.23. variation of pseudo first order rate constant kobs with hydrogen ion concentration shows a saturation kinetics at high constant ligand EDTA concentration (3.0 x 10-2 M) and at low pH region (3.67). the result were interpreted in terms of three-step mechanism, involving : (1) protonation of the ferrioxamine B comples and the ferric comples of azoverdine and (2) subsequent biomolecular reaction with EDTA.

KOMPOSISI KIMIA SUBSTRAT ASOSIASI Sonneratia alba - Avicennia marina DI MUARA SUNGAI LEKOK KABUPATEN PASURUAN Hani Sudarmanto; Mas Loegito; Trisnadi Widyoleksono C.P.; Handoko Darmokoesoemo; Sediono
JURNAL PENELITIAN BIOLOGI BERKALA PENELITIAN HAYATI Vol 3 No 2 (1997): December 1997
Publisher : The East Java Biological Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23869/512

The mangrove forest occurred in the north coast of Pasuruan Regency have not been reported about the vegetational and substrate compositions. The research's purpose were to analysis the vegetational composition and the chemical properties of the substrate. The result showed that this mangrove forest were dominated by association of Sonneratia alba - Avicennia marina. The result showed that soils had the natural reaction (pH 7.01-7.65), low in organic matter (2.18-4.27%) and total nitrogen (0.48-0.51%), but high in total phosphorus (15.19-29.22 ppm) and in exchangeable cation (Ca2+: 389.855-504.065 mg/100 gr, Mg2+: 409.522-441.400 mg/100 gr, K+: 228.900-390-435 mg/100 gr).

EDUKASI PEMANFAATAN BAHAN ALAM SEBAGAI OBAT TRADISIONAL UNTUK PENCEGAHAN PENYAKIT DAN PERAWATAN KESEHATAN Fatiha Khairunnisa; Qurrota A’yuni; Kautsar Ul Haq; Harsasi Setyawati; Ahmadi Jaya Permana; Rico Ramadhan; Yanuardi Raharjo; Mulyadi Tanjung; Sri Sumarsih; Hartati; Handoko Darmokoesoemo
Jurnal ABDI: Media Pengabdian Kepada Masyarakat Vol. 8 No. 1 (2022): Vol.8, No.1(2022)
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26740/abdi.v8i1.15268

One of the ways to maintain the personal health during an emergency condition as the current COVID-19 is the utilization of natural ingredients. It can be processed into traditional medicines. Jamu as a type of traditional medicine as well as natural heritage has been widely used by Indonesian to prevent the body from disease and to treat the health issue. This community service aimed to provide education for society regarding the chemical content and efficacy of natural ingredients such as empon-empon. The techniques to process it into traditional medicine for family healthcare was also delivered. The activity was carried out through face-to-face meeting while still applying the health protocols. The level of success and usefulness of the activity was known from the response of the participants. In general, the PKM activities in the scheme of theory and practical session has been carried out well. The materials presented in theory session was understandable. Meanwhile, the techniques used in practical session was easy to be replicated. The activity was expected to increase the knowledge and skills of the society in terms of natural ingredients that have good chemical content and the techniques to process them into nutritious drinks for families.

Utilization of Nanochitosan as Adsorbent of Mercury (Hg) in Gold Ore Processing Waste Nadhifa Aliyya Himawan; Handoko Darmokoesoemo; Totok Ardiarto; A. Budi Prasetya; Badrud Tamam Ibnu Ali
Eksergi Vol 19, No 2 (2022)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v19i2.6862

Mercury pollution in gold ore processing wastewater can cause environmental and health problems. A large amount of mercury pollution causes neurological disease, paralysis, loss of sense of taste, irregular speech, and death. One effective method to reduce mercury amount in the environment is adsorption. Adsorption performance is affected by several factors such as surface area of material, deacetylation degree (DD), and adsorption condition, which is indicated by contact time and mercury concentration. Nanochitosan is used in this research. Effect of deacetylation degree (85%; 87%; 95%), contact time (30;60;90;120 minutes), and variation of mercury concentration (5;10;15;20;25;30 ppm) on adsorption performance was investigated in this research. Nanochitosan in this research is characterized by FTIR, SEM-EDX, BET-BJH, and pH PZC. AAS measures adsorption performance in this research. The result shows that nanochitosan, which has the best adsorption performance, is nanochitosan with a deacetylation degree of 95%, at a contact time of 60 minutes, and mercury concentration is 15 ppm.

Pemanfaatan Nanokitosan Sebagai Coating Agent dalam Pembuatan Pupuk NPK Berbasis Control Release Fertilizer Sastra, Richad Ade; Adiarto, Totok; Prasetyo, Antonius Budi; Darmokoesoemo, Handoko; Putri, Devi Indrasari Mustopa
Eksergi Vol 20, No 3 (2023)
Publisher : Prodi Teknik Kimia, Fakultas Teknologi Industri, UPN "Veteran" Yogyakarta

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31315/e.v20i3.10699

Kitosan merupakan biopolimer yang terdiri atas monomer glukosamin serta memiliki potensi sangat besar untuk dikembangkan sebagai biomaterial. Berdasarkan karakternya, kitosan larut dalam asam lemah dan tidak larut dalam air. Pada penelitian ini, kitosan dimodifikasi menjadi ukuran nano (nanokitosan) untuk meningkatkan kapabilitasnya sebagai membran dan digunakan sebagai coating agent dalam pembuatan pupuk NPK yang berbasis Control Release Fertilizer. Sintesis nanokitosan dilakukan dengan metode gelasi ionik dengan memberikan variasi pada lama pengadukan dan konsentrasi crosslinker. Variasi lama waktu pengadukan yang diberikan adalah 5 menit, 10 menit, dan 15 menit. Crosslinker yang digunakan dalam penelitian ini adalah Sodium Tripolyphosphate (STPP) dengan variasi konsentrasi 0,2%; 0,25%; 0,3%. Dari hasil uji release yang dilakukan, didapatkan nanokitosan dengan variasi lama pengadukan 15 menit dengan konsentrasi STPP 0,3% sebagai variasi yang paling optimal dengan release paling kecil. Melalui karakterisasi PSA, didapatkan ukuran nanokitosan tersebut sebesar 202,1 nm, dengan bentuk morfologi yang berbentuk bulatan teraglomerasi pada hasil SEM. Karakterisasi XRD yang didapatkan menunjukkan bahwa partikel bersifat amorf. Sedangkan pada hasil FTIR, didapatkan perbedaan vibrasi antara kitosan dengan nanokitosan pada bagian ikatan crosslink yang terbentuk.

COMMUNITY DEVELOPMENT THROUGH EDUCATION ON THE PROCESSING OF HOUSEHOLD WASTE INTO COMMERCIAL PRODUCTS Widati, Alfa Akustia; Adiarto, Tokok; Zakki Fahmi, Mochamad; Budi Prasetyo, Antonius; Darmokoesoemo, Handoko; Supriyanto, Ganden; Sumarsih, Sri; Purwaningsih, Aning; Khasanah, Miratul; Hartati, Hartati; Baktir, Afaf; Hadi, Sofijan; Purkan, Purkan; Raharjo, Yanuardi; Khairunnisa, Fatiha; A'yuni, Qurrota; Tri Puspaningsih, Ni Nyoman; Hwei Voon, Lee
Jurnal Layanan Masyarakat (Journal of Public Services) Vol. 8 No. 3 (2024): JURNAL LAYANAN MASYARAKAT
Publisher : Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/jlm.v8i3.2024.329-338

Community empowerment and household waste processing are two issues that need to be resolved by the government. An independent and educated society is an important pillar to support the development of country. Meanwhile, waste that continues to accumulate without processing has a negative impact on health and the environment. Public education about household waste processing can be a solution to the two problems above. Education was carried out at Junior High School YBPK Surabaya and residents of Dukuh Kupang Surabaya, and other participants who joined in a hibrid meeting with a total of 116 participants. Activities at YBPK Surabaya took place on 25 March and 5 August 2023 and activities at Dukuh Kupang Surabaya took place on 27 May and 26 August 2023. The types of waste processed are organic waste and used cooking oil, which are then converted into eco-enzymes and used cooking oil Activities are divided into 2 stages. there are community education activities and program sustainability monitoring activities. The community education activities includes presentation and workshop were hold in March 2023 at YBPK Surabaya Middle School and May 2023 at Dukuh Kupang Surabaya. The evaluation of sustainability program including individual practice and monitoring of activities was carried out in August 2023 at Dukuh Kupang Surabaya. Methods for implementing activities include presentation, practice accompanied by a mentor, individual practice, and monitoring program sustainability. Based on the analysis of participants' ability, the participant scores before and after the activity was increase. It means that this training succeeded in increasing participants' knowledge and skills in processing waste, especially organic waste and used cooking oil waste. A total of 72 out of 116 participants (62%) had processed household waste either individually or in groups. Activity evaluation data shows that these activities are necessary and on target to create an independent and creative society.

Use of Placuna placenta Shells as Green Adsorbent for Pb(II) Ions Sequestration from Aqueous Solution Kuncoro, Eko Prasetyo; Matondang, Claudia Deborah Pretty; Hidayat, Muchlis Fajar; Darmokoesoemo, Handoko
JKPK (Jurnal Kimia dan Pendidikan Kimia) Vol 8, No 3 (2023): JKPK (Jurnal Kimia dan Pendidikan Kimia)
Publisher : Program Studi Pendidikan Kimia FKIP Universitas Sebelas Maret

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/jkpk.v8i3.77618

Heavy metal treatment is crucial to mitigate these elements' adverse environmental impacts. Among various remediation methods, adsorption stands out due to its simplicity and high efficiency. In this context, Placuna placenta shell, a biowaste, has been explored for its potential in treating wastewater contaminated with Pb(II) ions. This research was designed to assess the Placuna placenta shell's proficiency in removing Pb(II) ions from aqueous solutions. The study involved two main components: an adsorption test to evaluate the heavy metal removal capability of the Placuna placenta shel and a comprehensive characterization of the shell-based adsorbent. The adsorption experiments were conducted using a batch system, where variables such as pH levels and contact time were meticulously altered to determine their effect on the adsorption efficiency. Concurrently, the adsorbent underwent thorough characterization through Fourier-Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), and X-ray Diffraction (XRD) analysis. The experimental findings indicated that the optimal conditions for maximum Pb(II) ion removal were achieved at a pH of 7 and a contact time of 120 minutes. The FTIR analysis of the adsorbent revealed the presence of calcium carbonate (CaCO3), a finding further substantiated by the XRD analysis results. Additionally, SEM imaging provided visual evidence of metal ion deposition on the aggregates of the adsorbent. The study demonstrated that the Placuna placenta shell exhibits promising qualities as an adsorbent for removing heavy metals from contaminated water sources. This finding highlights the potential of utilizing biowaste in environmental remediation and offers a sustainable approach to addressing heavy metal pollution.

Co-Authors A. Budi Prasetya A.M. Albrecht Gary Adiarto, Totok AFAF BAKTIR Ahmadi Jaya Permana Alfa Akustia Widati Aziz, Rizky Abdul Badrud Tamam Ibnu Ali Budi Prasetyo, Antonius Denny Ika Rahmawati Eko Prasetyo Kuncoro Fatiha Khairunnisa Fetty, Amelia Julia Tria Ganden Supriyanto Hani Sudarmanto Harsasi Setyawati Hartati Hartati Hartati Hartati Hidayat, Muchlis Fajar Hwei Voon, Lee Ishma, Ervina Fadhilatul Kautsar Ul Haq Mas Loegito Matondang, Claudia Deborah Pretty Mirartul Khasanah Miratul Khasanah Mochamad Zakki Fahmi Mulyadi Tanjung Nadhifa Aliyya Himawan Nesti Widayanti Ni Nyoman Tri Puspaningsih Prasetyo, Antonius Budi Purkan Purkan, Purkan Purwaningsih, Aning Putri, Devi Indrasari Mustopa Qurrota A’yuni Rico Ramadhan, Rico Salsabila, Fara Sastra, Richad Ade Sediono, Sediono Sofijan Hadi Sri Sumarsih Suyanto suyanto Tokok Adiarto Totok Ardiarto Trisnadi Widyaleksono Catur Putranto Yanuardi Raharjo, Yanuardi

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