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All Journal Marine Fisheries: Jurnal Teknologi dan Manajemen Perikanan Laut Jurnal Ilmu dan Teknologi Kelautan Tropis JURNAL KIMIA SAINS DAN APLIKASI Jurnal Penelitian Hasil Hutan Agrifor : Jurnal Ilmu Pertanian dan Kehutanan Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (Journal of Natural Resources and Environmental Management) ALCHEMY Jurnal Penelitian Kimia Indonesian Journal of Chemistry Jurnal Penelitian Hasil Hutan Makara Journal of Science Digital Bisnis: Jurnal Publikasi Ilmu Manajemen Dan E-commerce JURNAL REKAYASA KIMIA & LINGKUNGAN
Mohammad Khotib
Department Of Chemistry, Faculty Of Mathematic And Natural Sciences, Bogor Agricultural University, Darmaga Campus, Fapet Building W2 Lt 4-5, Agatis Street, Bogor 16680; Integrated Laboratory, Bogor Agricultural University, Baranangsiang Campus, Paja
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Energy Engineering Environmental Science Library & Information Science Materials Science & Nanotechnology

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POLA DINAMIS PENURUNAN HASIL TANGKAPAN UDANG AKIBAT PENGENDAPAN DAN LIMBAH INDUSTRI DI KAWASAN SEGARA ANAKAN (Dynamic Pattern of Degradation of Shrimps Catch as an Effect of Sedimentation and Industrial Waste in Segara Anakan) . Mustaruddin; Domu Simbolon; Mohammad Khotib
Marine Fisheries : Journal of Marine Fisheries Technology and Management Vol. 7 No. 2 (2016): Marine Fisheries: Jurnal Teknologi dan Manajemen Perikanan Laut
Publisher : Bogor Agricultural University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (481.949 KB) | DOI: 10.29244/jmf.7.2.125-136

Abstract

AbstractSegara Anakan, Cilacap Regency is an important marine fisheries producer in Central Java Province, especially for shrimps. The objective of this study were to analyze the production and fishing ground of shrimps, to analyze dynamic patterns of shrimps cat ch affected by sedimentation and  industrial waste in Segara  Anakan, and to develop intervention option to the degradation  of shrimp  catch  as  well.   Some  methods  were  used  in  this  study  such  as  descriptive  method, geographic information system, and dynamic model approach included the test of model structural stability and performance. In  2002–2013, the highest production of shrimps in the Segara Anakan was in 2006 (2263.0 ton) and the lowest was in 2010 (884.7 ton). Fishing ground of shrimp in the Segara  Anakan  already  had high total suspended solid, and also  low contaminated oil and  lead (Pb). Results of dynamic model analysis showed that shrimp catch degraded exponentially along with the increasing of sediment accumulation and industrial waste. Shrimps production in 2013 was 1147.8  tons,  and  might  decrease   43.04  %  to  be  653.8  tons  over  75  years  later  without intervention. If the model was intervenced by fishing open -close system and limited acces fishing ground,  hence  shrimps  catch  showing  stable  around  902.2–929.1  ton  every  year.  While  if  the intervention was conducted by the stopping of industrial waste to Segara Anakan, hence shrimps catch only decrease 13.00 % to be 998.6 tons over 75 years later.Keywords: dynamic model, fishing ground, industrial waste, shrimp catchAbstrakABSTRAKSegara Anakan, Kabupaten Cilacap merupakan basis produksi perikanan laut yang penting di  Provinsi  Jawa  Tengah  terutama  jenis  udang.   Penelitian  ini  bertujuan  menganalisis  kondisi produksi dan daerah penangkapan udang, menganalisis pola dinamis penurunan hasil tangkapan udang  akibat  pengaruh  pengendapan  dan  pembuangan  limbah  industri  di  kawasan  Segara Anakan,  serta  mengembangkan  alternatif  intervensi  secara  modelling  terhadap  penurunan tersebut.  Metode  yang  digunakan  terdiri  dari  metode  deskriptif,  sistem  informasi  geografi, pendekatan  model  dinamis,  serta  uji  kestabilan  struktur  dan  kinerja  model.  Pada  periode  tahun 2002  –  2013, produksi tertinggi udang terjadi pada tahun 2006 (2263,0 ton) dan terendah terjadi pada tahun 2010 (884,7 ton). Daerah penangkapan udang di kawasan Segara Anakan mempunyai total padatan tersuspensi dan kekeruhan yang tinggi, serta tercemar ring an oleh minyak dan logam timbal. Analisis model dinamis menunjukkan bahwa hasil tangkapan udang cenderung menurun secara eksponensial seiring meningkatnya akumulasi endapan  dan cemaran limbah industri dari waktu  ke  waktu.  Hasil  tangkapan  udang  yang  saat  ini  (tahun  2013)  mencapai  1147,8  ton,  bisa menurun 43,04 % menjadi 653,8 ton setelah 75 tahun kemudian. Bila model tersebut diintervensi dalam  bentuk  penerapan  sistem  open-close  dan  pembatasan  daerah  penangkapan  yang  bisa diakses,  maka  hasil  tangkapan  udang  cenderung  stabil  pada  kisaran  angka  902,2  –  929,1  ton setiap  tahunnya.   Akan  tetapi  bila  intervensi  dilakukan  dalam  bentuk  penghentian  pembuangan limbah industri ke kawasan Segara  Anakan  dan sekitarnya, maka hasil  tangkapan udang hanya turun 13,00 % (menjadi 998,6 ton) setelah 75 tahun kemudian.Kata kunci: model dinamis, daerah penangkapan, limbah industri, hasil tangkapan udang
KARAKTERISASI KARBON PELET CAMPURAN RUMPUT GAJAH (Pennisetum purpureum Scumach) DAN TEMPURUNG NYAMPLUNG (Calophyllum inophyllum Linn.) Santiyo Wibowo; Daniel P.O Laia; Mohammad Khotib; Gustan Pari
Jurnal Penelitian Hasil Hutan Vol 35, No 1 (2017): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20886/jphh.2017.35.1.73-82

Abstract

Karbon pelet adalah produk arang yang terbuat dari biomassa karbonisasi yang hancur menjadi bubuk halus dan dipadatkan menjadi pelet. Karbon pelet dirancang untuk energi alternatif terbarukan untuk memasak, proses pembakaran dan kemungkinan untuk pembangkit listrik tenaga uap sebagai pengganti batubara. Makalah ini mempelajari kualitas pelet karbon yang terbuat dari campuran rumput gajah dengan tempurung nyamplung. Setelah karbonisasi, rumput gajah dan kulit biji nyamplung hancur dalam 60 mesh bubuk untuk pelet dengan berbagai rasio rumput gajah arang dan arang tempurung nyamplung dari 100:0, 75:25, 50:50, 25:75, dan 0:100 homogen. Sepuluh persen PVAC perekat ditambahkan ke dalam campuran sebelum kompresi. Hasil penelitian menunjukkan bahwa komposisi campuran 75% arang rumput gajah dan 25% arang tempurung nyamplung direkomendasikan untuk karbon pelet. Komposisi campuran tersebut meningkatkan sifat fisik karbon pelet dengan rata-rata kadar air 3,35%, zat terbang 26,19%, kadar abu 13,59%, karbon terikat 60,21%, kepadatan 0,68 kg/cm3, kuat tekan 5,91 kg/cm2 dan nilai kalor 6080 kal/g.
POLA PENCEMARAN LOKASI PENANGKAPAN DAN IKAN HASIL TANGKAPAN AKIBAT BERKEMBANGNYA AKTIVITAS EKONOMI DI SEKITAR DANAU MANINJAU Mustaruddin Mustaruddin; Eko Sri Wiyono; Mohammad Khotib; Asnil Asnil; Samsul Bahri
Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (Journal of Natural Resources and Environmental Management) Vol. 8 No. 2 (2018): Jurnal Pengelolaan Sumberdaya Alam dan Lingkungan (JPSL)
Publisher : Graduate School Bogor Agricultural University (SPs IPB)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29244/jpsl.8.2.134-142

Abstract

Maninjau Lake is the territorial waters of which contribute greatly to fish production in Agam, West Sumatra.  But a lot of waste of economic activities discharged into the lake.  This study aims to analyze the characteristics of fishing, contamination status of fishing ground and fish caught, to analyze the contamination pattern of fishing ground and fish caught as effect of economic activity waste.  The methods used are descriptive method, physic-chemical analysis, correlation method, and multiple regression method.  The results showed the fishing in Lake Maninjau, generally using langli net, lift net, hook and lines, and cast net.  While the main fish caught are nile tilapia, bada fish, rinuak fish, carp, and limbek fish.  Fishing ground in Maninjau Lake contaminated by ammonia, garbage, Cd and Hg metals, while the fish caught, there was found to have gills dirty.  Significantly, fishing ground disturbed by the waste of hydropower (X1), lake tourism (X2), settlements (X4), and KJA fisheries (X5).  The contamination pattern of fishing ground formulated by Y1=0,220X1+0,085X2+0,227X4+0,204X5-4,540.  Fish production disturbed significantly by the waste from hotel and restaurants (X3), seattlements (X4), and KJA fisheries (X5).  The contamination pattern of fish caught, represented by a decrease in fish production (Y2) formulated by Y2 =1,195X3+2,152X4+5,140X5-41,664.
KARAKTERISASI KARBON PELET CAMPURAN RUMPUT GAJAH (Pennisetum purpureum Scumach) DAN TEMPURUNG NYAMPLUNG (Calophyllum inophyllum Linn.) Santiyo Wibowo; Daniel P.O Laia; Mohammad Khotib; Gustan Pari
Jurnal Penelitian Hasil Hutan Vol 35, No 1 (2017): Jurnal Penelitian Hasil Hutan
Publisher : Pusat Penelitian dan Pengembangan Hasil Hutan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (593.716 KB) | DOI: 10.20886/jphh.2017.35.1.73-82

Abstract

Karbon pelet adalah produk arang yang terbuat dari biomassa karbonisasi yang hancur menjadi bubuk halus dan dipadatkan menjadi pelet. Karbon pelet dirancang untuk energi alternatif terbarukan untuk memasak, proses pembakaran dan kemungkinan untuk pembangkit listrik tenaga uap sebagai pengganti batubara. Makalah ini mempelajari kualitas pelet karbon yang terbuat dari campuran rumput gajah dengan tempurung nyamplung. Setelah karbonisasi, rumput gajah dan kulit biji nyamplung hancur dalam 60 mesh bubuk untuk pelet dengan berbagai rasio rumput gajah arang dan arang tempurung nyamplung dari 100:0, 75:25, 50:50, 25:75, dan 0:100 homogen. Sepuluh persen PVAC perekat ditambahkan ke dalam campuran sebelum kompresi. Hasil penelitian menunjukkan bahwa komposisi campuran 75% arang rumput gajah dan 25% arang tempurung nyamplung direkomendasikan untuk karbon pelet. Komposisi campuran tersebut meningkatkan sifat fisik karbon pelet dengan rata-rata kadar air 3,35%, zat terbang 26,19%, kadar abu 13,59%, karbon terikat 60,21%, kepadatan 0,68 kg/cm3, kuat tekan 5,91 kg/cm2 dan nilai kalor 6080 kal/g.
Thermodynamic and Kinetic Study of Zinc bis-(Dipalmithyl Dithiophosphate) Activity as Anti-Corrosion Additive-Fatty Acid Based Through Potentiodynamic Polarization Technique Komar Sutriah; Zainal Alim Mas’ud; Mohammad Khotib; Denar Zuliandanu
Indonesian Journal of Chemistry Vol 16, No 2 (2016)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (493.913 KB) | DOI: 10.22146/ijc.21166

Abstract

Zinc bis-(dipalmithyl dithiophosphate) (ZDTP16) is one product variant of zinc dialkyl dithiophosphate (ZDTP)-fatty acid based having function as corrosion inhibitor. By using 3% of effective dose for the application, its effectiveness of ZDTP16 corrosion inhibition will achieve 97% and it will be able to decrease Cu metal corrosion rate from 0.152 to 0.004 mm per year. Thermodynamic and kinetic parameter verification indicates the decreasing of spontaneity and corrosion rate by existence of ZDTP16 inhibitor. Gibbs free energy transition corrosion of Cu metal in electrolyte medium is measured in corrosion simulator increased from +85.22 to +91.77 kJ mol-1, while its activation energy increased from +16.66 to +33.68 kJ mol-1. Morphology observation of Cu metal substrate surface using SEM-EDX shows that the adsorption of ZDTP16 at substrate surface is able to protect surface from corrosion indicated by the existence of Zn, P, S, and C constituents representing composer atoms of ZDTP16, and the decreasing of Cl- corrosive constituent at substrate surface.
Performance of Zinc-Difattyalkyldithyocarbamate as Anti-Friction/Anti-Wear Lubricant Additives Komar Sutriah; Zainal Alim Mas’ud; Tun Tedja Irawadi; Mohammad Khotib
Indonesian Journal of Chemistry Vol 14, No 1 (2014)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (592.03 KB) | DOI: 10.22146/ijc.21271

Abstract

Dithyocarbamate is an organosulphur compound that has long been known and widely applied in various fields, including in agriculture and industry. Several variants of synthesized vegetable oil-based Zinc-difattyalkyldithyocarbamate were tested its anti-friction/anti-wear performance on four ball machine using the method of ASTM-D2783. Anti-friction/anti-wear test to six of additive variants of Zinc-difattyalkyldithyocarbamate at doses of 1.2% indicated that all variants of the product has welding point value higher than the lube base oil lubricant HVI 60, and from US Steel 136 standard for Hydraulic lubricants, but only two additive variants of Zinc-bis(lauryl palmityl)dithyocarbamate and Zinc-bis(lauryl oleyl)dithyocarbamate which has a larger load wear index value than the standard, and meet the criteria as an additive extreme pressure according to US steel 136 standard. Zinc-bis(lauryl palmityl)dithyocarbamate is an additive variant with the best performance, meet bi-functional lubricant additives criteria, as anti-friction/anti-wear and antioxidant additive.
Synthesis of Cassava Waste Pulp-Acrylamide Super Absorbent: Effect of Initiator and Cross-Linker Concentration Zainal Alim Mas’ud; Mohammad Khotib; Nurmutia Sari; Anwar Nur
Indonesian Journal of Chemistry Vol 13, No 1 (2013)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (2601.851 KB) | DOI: 10.22146/ijc.21328

Abstract

Cassava waste pulp (CWP) contains high carbohydrates that can be modified into super absorbent polymer (SAP) through grafting and cross-linking copolymerization. Acrylamide (AM) was grafted onto CWP with ammonium persulfate (APS) as the initiator and N,N'-methylene-bis-acrylamide (MBA) as the cross-linker under atmospheric nitrogen. The effect of APS and MBA concentrations on water absorption capacity of saponified SAP was studied, while the evaluation of grafting ratio (GR) and grafting efficiency (GRE) was conducted on unsaponified SAP. The grafting success was indicated by the occurrence of IR peaks at wave numbers of 573, 765, 858, and 1667 cm-1. In the saponified SAP, the very intense characteristic band at 1562 cm-1 is due to C=O asymmetric stretching in the carboxylate anion. Saponification increases significantly water absorption capacity compared to that of unsaponified SAP (from 39.79 g/g to 578.23 g/g). The highest water absorption capacity is reached at 0.74% APS and 0.09% MBA. The percentage of GRE and GR tends to increase with increasing APS concentration until reaching the highest value and then decreases. Effect of MBA concentration on water absorption capacity, GR, and on GRE is similar to the effect of initiator concentration on GR and GRE.
Synthesis of TiO2/Carbon Nanoparticle (C-dot) Composites as Active Catalysts for Photodegradation of Persistent Organic Pollutant Dedri Syafei; Sri Sugiarti; Noviyan Darmawan; Mohammad Khotib
Indonesian Journal of Chemistry Vol 17, No 1 (2017)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (332 KB) | DOI: 10.22146/ijc.23615

Abstract

TiO2/C-dot composites were synthesised by sol-gel method and  investigated as catalysts for photocatalytic degradation of persistent organic pollutants (perchloroethylene, PCE). The composites photoluminescence properties was shown by visual analysis and the synthesis product was characterized by XRD, FTIR, fluorescence spectrophotometer, and UV-Vis spectrophotometer. Degradation of PCE 0.1% (v/v) in the aqueous phase was investigated under sunlight irradiation for 2 h. Photodegrade efficiency of PCE was determined by GC. Composites of TiO2/C-dot 2.5% (w/w) was succesfully to degrade PCE under sunlight irradiation and its photodegrade efficiency was up to 89.45%.
Reaction Products of Crude Palm Oil-based Fatty Acids and Monoethanolamine as Corrosion Inhibitors of Carbon Steel Ali, Mohamad Makrus; Irawadi, Tun Tedja; Darmawan, Noviyan; Khotib, Mohammad; Mas’ud, Zainal Alim
Makara Journal of Science Vol. 23, No. 3
Publisher : UI Scholars Hub

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Herein we report the application of the reaction products of crude palm oil-based fatty acids and monoethanolamine as sustainable corrosion inhibitors in acidic environments for carbon steels. Reaction products were identified based on FTIR analysis as a mixture of 2-aminoethyl fatty esters and N-(2-hydroxyethyl) fatty amides. Corrosion inhibition effect of these compounds was evaluated by potentiodynamic polarization techniques in 0.5 M HCl. The mixture of fatty esters and fatty amides showed promising potential as an alternative corrosion inhibitor. Inhibition efficiency was found to be 80% at 80 ppm. Thermodynamic and kinetic parameters obtained from the tafel plot displayed an increase in activation energy with a higher inhibitor concentration that led to the decrease in the corrosion rate. Furthermore, physisorption interaction was found to be the main process of the inhibitor’s adsorption on metal surfaces and obeyed the adsorption model of the Langmuir isotherm.
PRODUKSI PUPUK ORGANIK PADAT DARI LIMBAH SERABUT KELAPA SAWIT DENGAN BAHAN PENUTUP GEOTEKSTIL Fahrizal Hazra; Deden Saprudin; Mohammad Khotib; Kevin Setiawan
Agrifor : Jurnal Ilmu Pertanian dan Kehutanan Vol 22, No 1 (2023): Maret 2023
Publisher : Universitas 17 Agustus 1945 Samarinda

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31293/agrifor.v22i1.6371

Abstract

Serabut kelapa sawit memiliki C/N rasio yang tinggi sehingga dalam pemanfaatannya sebagai pupuk organik padat diperlukan proses pengomposan agar dapat menurunkan C/N rasio. Bahan penutup yang baik diperlukan dalam proses pengomposan guna menghasilkan pupuk organik padat yang efektif dan memenuhi syarat mutu. Tujuan penelitian ini adalah memproduksi pupuk organik padat dari limbah serabut kelapa sawit menggunakan bahan penutup geotekstil dengan pembanding penutup plastik, serta dilakukan pengujian kualitas fisik, kimia, dan biologi. Penelitian ini menggunakan rancangan acak lengkap (RAL) 2 × 2. Faktor pertama merupakan bahan penutup (P), yang terdiri atas 2 taraf yaitu, bahan penutup geotekstil (P1) dan bahan penutup plastik (P2). Faktor kedua adalah penambahan mikrob (C), yang terdiri 2 taraf yaitu, tanpa penambahan mikrob (C0), dan dengan penambahan mikrob (C1). Proses pengomposan dilakukan selama 30 hari dan dilakukan pembalikan setiap 3 hari. Hasil penelitian menunjukkan bahwa produksi pupuk organik padat kualitas terbaik terdapat pada perlakuan dengan bahan penutup geotekstil yang menghasilkan warna coklat kehitaman dan beraroma seperti tanah, pH dan total hara makro (N+P2O5+K2O) yang telah memenuhi syarat berdasarkan Keputusan Menteri Pertanian No. 261 Tahun 2019, serta total mikrob yang sangat tinggi.
Co-Authors Alan Frendy Koropitan Ali, Mohamad Makrus Anwar Nur Asnil Asnil Bambang Soegijono Chamariyah Chamariyah Daniel P.O Laia Deden Saprudin Dedri Syafei Defrizal, Muhammad Denar Zuliandanu Domu Simbolon Eriza, Nurul Fadli Fakhrullah Fahrizal Hazra Gina Libria Nadjamoeddin Gustan Pari Hartanto, Mochamad Tri Ida Ayu Putu Sri Widnyani Kevin Setiawan Komar Sutriah Kusumaningsih, Alvianita Mas'ud, Zainal Alim Mas’ud, Zainal Alim Mustaruddin Nasrudin, M Fikry Noviyan Darmawan Nurmutia Sari Purwantiningsih Sugita Putri Permatasari Samsul Bahri Santiyo Wibowo Shinya Takahashi Subastiar, Ian Subijanto Subijanto Sugesti, Rahmawita Takeno Akiyoshi TATI NURHAYATI Tetty Kemala Tri Prartono Tun Tedja Irawadi Zainal Alim Mas'ud Zainal Alim Mas’ud Zainal Alim Mas’ud Zainal Alim Mas’ud