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All Journal Prosiding Semnastek ALCHEMY Jurnal Penelitian Kimia Indonesian Journal of Chemistry SEMAR Molekul: Jurnal Ilmiah Kimia
Atmanto Heru Wibowo
Department Of Chemistry, Faculty Of Natural Sciences And Mathematics, Universitas Sebelas Maret, Jl. Ir. Sutami 36A, Kentingan, Surakarta 57126, Indonesia
Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Computer Science & IT Education Energy Environmental Science Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Social Sciences

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Pengaruh Natrium Terhadap Adsorpsi Lithium Pada Proses Pengendapan Menggunakan Mangan Hidroksida Fariza Eka Yunita; Latifa Hanum Lalasari; Bagaskoro Pranata Ardhi; Atmanto Heru Wibowo
Prosiding Semnastek PROSIDING SEMNASTEK 2019
Publisher : Universitas Muhammadiyah Jakarta

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

Abstract

Litium mangan oksida atau LMO (LiMn2O4) merupakan salah satu senyawa litium yang digunakan sebagai katoda baterai. Pada penelitian sebelumnya, diketahui bahwa LMO dapat dipreparasi menggunakan metode presipitasi di dalam fasa aqueous menggunakan prekursor anorganik. Serangkaian percobaan dilakukan untuk menyelidiki proses adsorpsi litium dalam campuran LiCl, MnSO4, NH4OH serta pengaruh ion natrium terhadap proses tersebut. Mangan sulfat dengan massa 25 gram dilarutkan dalam 200 ml air distilasi dengan ammonia sesuai perhitungan stoikiometri. Larutan ini kemudian ditambahkan LiCl serta NaCl dengan berbagai variasi perbandingan konsentrasi dan diaduk selama 1 jam. Residu yang dihasilkan kemudian dikeringkan dan dikalsinasi. Hasil penelitian menunjukkan bahwa adsorpsi ion litium pada proses pengendapan mangan hidroksida akan terganggu dengan penambahan natrium. Selektivitas adsorpsi ion litum akan menurun seiring dengan penambahan konsentrasi ion natrium, sehingga diharapkan prekursor yang akan digunakan dalam sintesis katoda LMO harus bebas dari unsur-unsur pengotor lainnya terutama natrium.
Synthesis and Thermal-Stability Study of Polybutylene Itaconate Modified with Divinyl Benzene and Glycerol Atmanto Heru Wibowo; Ninis Makhnunah; Deny Irawati; Candra Purnawan; Nanik Dwi Nurhayati; Henning Storz
Indonesian Journal of Chemistry Vol 14, No 3 (2014)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (449.802 KB) | DOI: 10.22146/ijc.21240

Abstract

Polybutylene itaconate (PBI) for modification with divinyl benzene (DVB) and glycerol has been synthesized at 180 °C for 3 h via polycondensation of itaconic acid (IA) and butanediols using catalyst of Ti(OBu)4. Modification on PBI was done with addition of 15%, 20% and 25% DVB (w/w) using benzoyl peroxide. With glycerol, weight variations of glycerol:1,4-butanediol (BDO) in the synthesis were 10%, 30%, and 50% (mole/mole). PBI and PBI modified with DVB and glycerol were characterized with FTIR and TG-DTA. PBI showed a wavenumber shift from 1703 cm-1 to 1728 cm-1 of the C=O functional group from acid to esther. The DVB modification on PBI also showed that the intensity decrease of C=C stretching was due to the formation of crosslinking on the double bond. In the modification with glycerol, three dimensional networking on the polyester occurred through bonding between hydroxyl of glycerol and acid group of IA. Constant intensity of C=C stretching on polyester was seen. The thermal stability of PBI modified with DVB increased, accompanied by rigidity change of the structure. The thermal stability of PBI modified with glycerol decreased, caused by the decrease of regularity degree and the elasticity increase of the three dimensional structure of polyester.
The Fermentation of Green Algae (Spirogyra majuscule Kuetz) using Immobilitation Technique of Ca-Alginate for Saccharomyces cerevisiae Entrapment Atmanto Heru Wibowo; Lailatul Mubarokah; Adhitasari Suratman
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 (2584.791 KB) | DOI: 10.22146/ijc.21319

Abstract

A study of batch fermentation of green algae (Spirogyra majuscula Kuetz) from Pengging Lake, Boyolali, Central Java for bioethanol source using immobilization technique of Ca-alginate for Saccaromyces cerevisiae entrapment has been done. The scope of the study emphasized on the best condition for the processes of hydrolysis and fermentation. Concentration of sulfuric acid and hydrolysis time were varied with 0.1, 0.2, 0.3, 0.4 and 0.5 M for 30, 90, 150, 210, 270, 330, 360, 390, 420, and 450 min to obtain the maximum glucose content of UV analysis. Na-alginate : yeast ratio and fermentation time were varied with 1:5, 2:4, 3:3, 4:2 and 5:1 (w/w) for 1, 2, 3, 4, 5, 6 and 7 days. Distillation at 70-80 °C was deployed to purify the fermentation product. The ethanol content in the product was analyzed using gas chromatography-flame ionization detector (GC-FID). The result of study showed that maximum glucose content was obtained 2.1% from 0.2 M sulfuric acid for 6 h of hydrolysis. Maximum ethanol content was obtained 54.1% from 2:4 ratio of Na-alginate : yeast (w/w) for 4 days of fermentation. The study also concludes that immobilization technique of Ca-alginate increase alcohol content compared to without immobilization of green-algae fermentation.
Synthesis of Fe(II)/Co(II)-Fused Triphenyl Porphyrin Dimer as Candidate for Oxygen Reduction Reaction Catalyst Atmanto Heru Wibowo; Anggit Pradifta; Abu Masykur; Ken-ichi Yamashita; Yosuke Tani; Ari Yustisia Akbar; Takuji Ogawa
Indonesian Journal of Chemistry Vol 21, No 4 (2021)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.61671

Abstract

This paper reports the synthesis of Fe(II)/Co(II) fused triphenyl porphyrin dimers as candidate of hybrid organic metal electrocatalyst. The synthesis was conducted in five-step reactions using the starting materials pyrrole and benzaldehyde. The fuse oxidative reaction was done via free-base form of triphenyl porphyrin to omit metal insertions/removals of intermediate products. This strategy is very beneficial for the synthesis of metal fused triphenyl porphyrin that needs less reactions where phenyliodine(III) bis(trifluoroacetate) (PIFA) was successfully deployed in the oxidative reaction of two free-base triphenyl porphyrins. Here, the comparisons of NMR spectra were presented to see the changes of the starting material to the product. Initial electrochemical tests showed that reduction current of planar structure of Fe/Co fused triphenyl porphyrin dimer was on the potential range at -1.10 V to 0.45 V vs Au. Fe-fused triphenyl porphyrin dimer with 7.58 × 10–4 A (-1.05 V) showed slightly better performance than Co-fused triphenyl porphyrin dimer with 5.67 × 10–4 A (-0.97 V).
Oxygen Reduction Reaction (ORR) of Pt/C Standard in Different Electrolyte Solutions and Terbium(III) Monoporphyrinato Complex Atmanto Heru Wibowo; Annisa Nur Buana Wati; Anas Santria; Abu Masykur; Maulidan Firdaus
Indonesian Journal of Chemistry Vol 23, No 2 (2023)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.78807

Abstract

Electrocatalytic parameters of a Pt/C standard and a sample of terbium(III) monoporphyrinato were investigated in different solutions. N electron transfer, Tafel slope, Eonset, and overpotential of the catalyst of Pt/C in different solutions were calculated and analyzed using a rotating ring disk electrode (RRDE) in 0.5 M H2SO4, 0.1 M HClO4 and 0.1 M NaOH. In the RRDE measurements, a bipotentiostat at a potential range of 1.03 to 0.05 V vs RHE (Ering = 1.2 V vs RHE) with a scan rate of 5 mV/s and rotation rates of 200, 400, 900, 1600 and 2500 rpm was used. Hereafter, the test of terbium(III) monoporphyrinato compound formulated in [Tb(TPP)(cyclen)]Cl (TPP = 5,10,15,20-tetraphenylporphyrinato; cyclen = 1,4,7,10-tetraazacyclododecane) as a candidate material for ORR electrocatalyst was also done. The results showed that the measurement of Pt/C standards was satisfactory according to the literature for all parameters with the n electron transfer close to 4 in all electrolytes media. [Tb(TPP)(cyclen)]Cl had an n electron transfer value of 2.38, suggesting that the [Tb(TPP)(cyclen)]Cl compound has less potential for ORR catalysts.
Pemanfaatan Abu Sekam Padi sebagai Sumber Silika untuk Pembuatan Adsorben Ion Logam Cd(II) melalui Teknik Imprinted Ionic Sri Hastuti; Ilham Tri Utomo; Tri Martini; Pranoto Pranoto; Candra Purnawan; Abu Masykur; Atmanto Heru Wibowo
ALCHEMY Jurnal Penelitian Kimia Vol 17, No 1 (2021): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.17.1.44241.113-123

Abstract

Banyaknya pencemaran ion logam dalam perairan menjadi perhatian yang serius para peneliti, terutama untuk mengurangi keberadaan ion logam Cd yang terkandung dalam perairan dengan menggunakan adsorben. Oleh karena itu, penelitian ini bertujuan untuk membuat adsorben berbasis silika dengan kapasitas dan selektifitas tinggi terhadap ion Cd(II). Dalam penelitian ini, sintesis material imprinted ionic Cd(II) (SiO2-TMPDT-Cd-Imp) telah berhasil dilakukan menggunakan prekursor natrium silikat dari abu sekam padi. Proses sintesis diawali dengan pembuatan natrium silikat. Selanjutnya, trimetoksisililpropildietilentriamin (TMPDT), ion logam Cd(II) dan HCl ditambahkan hingga terbentuk gel. Gel dielusi dengan etilenadiaminatetraasetat (EDTA) untuk membentuk cetakan (template). Hasil karakterisasi dengan FTIR menunjukkan TMPDT terikat pada silika ditandai dengan munculnya vibrasi ulur dari C-H alkana pada 2908 cm-1 dan vibrasi tekuk gugus N-H pada 1471 cm-1.  Karakterisasi dengan Surface Area Analyzers (SAA) menunjukkan bahwa material tersebut memiliki luas permukaan sebesar 12,674 m2/g, volume pori total sebesar 0,017 cc/g, dan jari-jari pori rerata sebesar 18,783 Å. Karakterisasi dengan SEM-EDX memperlihatkan adanya unsur C dan N pada SiO2-TMPDT-Cd-Imp. Kondisi optimum adsorpsi ion logam Cd(II) oleh SiO2-TMPDT-Cd-Imp terjadi  pada pH 6,  waktu kontak 10 menit dan konsentrasi awal sebesar 10 ppm. Model kinetika adsorpsi ion logam Cd(II) pada SiO2-TMPDT-Cd-Imp mengikuti pseudo orde 2. Proses adsorpsi SiO2-TMPDT-Cd-Imp cenderung mengikuti isoterm Freundlich dengan nilai  faktor heterogenitas (n) sebesar 1,617 dan konstanta Freundlich (KF) sebesar 2,768. Kapasitas adsorpsi maksimum untuk Langmuir (qm) sebesar 19,16 mg/g. Urutan selektifitas (K) ion logam Cd(II) terhadap ion logam lain pada SiO2-TMPDT-Cd-Imp adalah Cd-Pb<Cd-Ni<Cd-Co.Utilization of Rice Husk Ash as a Silica Source for the Preparation of Cd (II) Metal Ion Adsorbents through Imprinted Ionic Technique. The amount of metal ion contamination in the waters is a serious concern for researchers, especially in reducing the presence of Cd metal ions contained in waters by using adsorbents. Therefore, this study aims to make a silica-based adsorbent with high capacity and selectivity to Cd (II) ions. In this research, the synthesis of imprinted ionic Cd (II) (SiO2-TMPDT-Cd-Imp) was successfully carried out using sodium silicate precursor from rice husk ash. The synthesis process begins with the production of sodium silicate. Furthermore, trimethoxysylpropildethylentriamine (TMPDT), metal ion Cd(II) and HCl were added to form a gel. The gel was eluted with ethylenediaminatetraacetate (EDTA) to form a template. The FTIR analysis showed that the binding of TMPDT to silica was indicated by the appearance of stretching vibrations C-H alkanes at 2908 cm-1and bending vibrations of N-H groups at 1471 cm-1. The Surface Area Analyzers (SAA) data showed that the material had a surface area of 12.674 m2/g, total pore volume of 0.017 cc/g, and average pore radius of 18.783 Å. Further characterization using SEM-EDX showed the presence of elements of C and N in SiO2-TMPDT-Cd-Imp. The optimum conditions for adsorption of Cd(II) metal ions by SiO2-TMPDT-Cd-Imp occurred at pH 6, the contact time of 10 minutes, and the initial concentration of 10 ppm. The adsorption kinetics model of Cd(II) metal ion on SiO2-TMPDT-Cd-Imp follows a pseudo second order. The adsorption process of SiO2-TMPDT-Cd-Imp follows the Freundlich isotherm with a heterogeneity factor value (n) of 1.617 and a Freundlich constant (KF) of 2.768. The maximum adsorption capacity for Langmuir (qm) is 19.16 mg/g. The selectivity (K) metal ion Cd(II) to other metal ions in SiO2-TMPDT-Cd-Imp is Cd-Pb<Cd-Ni<Cd-Co.
Rice Husk Ash-Derived Magnetized Silica Functionalized with TMPDT for Heavy Metal Ion Removal Hastuti, Sri; Irfani, Hasna Haifa; Nuzula, Rifania Aura; Saraswati, Teguh Endah; Masykur, Abu; Purnawan, Candra; Wibowo, Atmanto Heru; Fitriana, Dina
Molekul Vol 21 No 1 (2026)
Publisher : Universitas Jenderal Soedirman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20884/1.jm.2026.21.1.17837

Abstract

ABSTRACT. The removal of toxic heavy metal ions from water remains a critical environmental challenge. In this study, a novel magnetized mesoporous silica adsorbent functionalized with N1-(3-trimethoxysilylpropyl) diethylenetriamine (Fe₃O₄@SiO₂@meso-SiO2@TMPDT), synthesized from rice husk ash, was developed for the adsorption of Cd(II) and Pb(II) ions. The characterization of the adsorbent by FTIR, SEM-EDX, and TGA confirmed the successful synthesis of magnetized and TMPDT-functionalized silica derived from rice husk ash (Fe₃O₄@SiO₂@meso-SiO₂@TMPDT). The adsorption study consists of the determination of optimum pH, the adsorption kinetics study, and the adsorption isotherm. Batch adsorption studies showed that the optimal pH values for Cd(II) and Pb(II) adsorption were 4 and 3, respectively. The adsorption kinetics for both metal ions followed a pseudo-second-order model. Furthermore, the adsorption isotherms fitted both the Langmuir and the Freundlich models with comparable R² values. The maximum adsorption capacities (Qₘ) of Fe₃O₄@SiO₂@meso-SiO₂@TMPDT for Cd(II) and Pb(II) were 28.089 and 24.498 mg/g, respectively. These findings demonstrate that the developed adsorbents offer an effective and sustainable approach for heavy metal removal from aqueous systems. Keywords: adsorption, heavy metal ions, magnetized silica, rice husk ash, TMPDT
Removal of Heavy Metals: Pb(II), Ni(II) And Cd(II) By Fe3O4@SiO2-TMPDT Adsorbent Prepared From Rice Husk Ash Sri Hastuti; Tri Martini; Atmanto Heru Wibowo; Dina Fitriana; Wihda Zuhara; Hesti Mutma'inah; Rima Indriyana Putri
ALCHEMY Jurnal Penelitian Kimia Vol 21, No 1 (2025): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.21.1.91934.53-63

Abstract

The adsorption of Pb(II), Ni(II), and Cd(II) metal ions onto Fe3O4@SiO2-TMPDT adsorbent was carried out through batch experiments. In this study, Fe3O4@SiO2-TMPDT adsorbent was synthesized through a sol-gel process using sodium silicate extracted from rice husk ash (Na2SiO3)RHA with the addition of magnetite (Fe3O4) and modifier N1-(3-trimethoxysilylpropyl) diethylenetriamine (TMPDT). The synthesized adsorbent was then characterized by FTIR. The Fe3O4@SiO2-TMPDT adsorbent was prepared with suspension Fe3O4:(Na2SiO3)RHA ratios (v/v) of 1:4, 2:3, and 1:1, and varying the amounts of TMPDT of 1; 2.5 and 5 mL. The optimum pH to perform conditions adsorption for Pb(II) metal ions was determined to be 4, while Ni(II) and Cd(II) were 5. In addition, the adsorption process followed a pseudo-second-order kinetic model, and the adsorption isotherm was consistent with the Langmuir isotherm. The adsorption capacities for Pb(II), Ni(II), and Cd(II) were 11.760 mg/g, 1.864 mg/g, and 1.888 mg/g, respectively.
Pemberdayaan Masyarakat melalui Pembuatan Detergen Cair Alami Berbasis Buah Lerak untuk Mengurangi Penggunaan Bahan Kimia Berbahaya Abu Masykur; Dina Fitriana; Sri Hastuti; Atmanto Heru Wibowo; Candra Purnawan; Denna Artika Cinta; Khairunnisa Nabilla
SEMAR (Jurnal Ilmu Pengetahuan, Teknologi, dan Seni bagi Masyarakat) Vol 14, No 2 (2025): November
Publisher : LPPM UNS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/semar.v14i2.109413

Abstract

Aktivasi peran masyarakat dalam menjaga lingkungan perairan penting dilakukan untuk menumbuhkan kesadaran masyarakat. Salah satu caranya adalah melalui edukasi tentang pentingnya menggunakan bahan rumah tangga yang ramah lingkungan. Kegiatan pengabdian dilakukan dengan melakukan sosialisasi kepada kelompok PKK di Perumahan Pondok Baru Permai IV, Kelurahan Ngesrep, Kecamatan Ngemplak, Kabupaten Boyolali mengenai dampak penggunaan detergen kimia yang berlebihan terhadap lingkungan. Pada sosialisasi ini, dikenalkan detergen ramah lingkungan yang berbahan dasar buah lerak yang kemudian diikuti dengan demonstrasi dan pelatihan. Keberhasilan kegiatan diukur dengan menganalisis hasil pretest dan posttest. Hasil menunjukkan adanya peningkatan pemahaman yang ditunjukkan oleh hasil posttest yang meliputi (1) anggota kelompok PKK telah mengetahui kandungan dalam detergen dan isu pencemaran lingkungan karena detergen komersial yang dievaluasi melalui peningkatan nilai rata-rata yang semula 87 pada pretest menjadi 99 pada postest. (2) Anggota kelompok PKK memahami cara membuat detergen cair berbasis lerak. Dengan demikian, kegiatan pengabdian ini memberikan implikasi mampu meningkatkan pengetahuan anggota kelompok PKK mengenai dampak penggunaan detergen konvensional, bahan alam yang potensial untuk digunakan sebagai bahan dasar detergen alami ramah lingkungan, dan keterampilan dalam membuat detergen cair dari bahan alam.
Co-Authors Abu Masykur Abu Masykur Abu Masykur Abu Masykur Abu Masykur Adhitasari Suratman Anas Santria Anggit Pradifta Annisa Nur Buana Wati Ari Yustisia Akbar Bagaskoro Pranata Ardhi Candra Purnawan Candra Purnawan Candra Purnawan Candra Purnawan Denna Artika Cinta Deny Irawati Dina Fitriana Fariza Eka Yunita Fitriana, Dina Henning Storz Hesti Mutma'inah Ilham Tri Utomo Indratin Indratin Irfani, Hasna Haifa Ken-ichi Yamashita Khairunnisa Nabilla Lailatul Mubarokah Latifa Hanum Lalasari Maulidan Firdaus Nanik Dwi Nurhayati Ninis Makhnunah Nuzula, Rifania Aura PRANOTO Rima Indriyana Putri Sri Hastuti Sri Hastuti Sri Hastuti Sri Wahyuni Takuji Ogawa Teguh Endah Saraswati Tri Martini Tri Martini Weny Pudiastuti, Weny Widyatmani Sih Dewi Wihda Zuhara Yosuke Tani