Garuda - Garba Rujukan Digital

SINTESIS MAGNETIT DARI LIMBAH TAMBANG BAUKSIT MENGGUNAKAN TEMPLAT CETYLTRIMETHYLAMMONIUMBROMIDE Syaila Nurhayati; Anis Shofiyani; Titin Anita Zaharah
Jurnal Kimia dan Kemasan Vol. 43 No. 2 Oktober 2021
Publisher : Balai Besar Kimia dan Kemasan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24817/jkk.v43i2.6516

Red mud dari tailing bauksit memiliki komposisi unsur besi cukup tinggi, yang memungkinkannya dijadikan bahan dasar sintesis magnetit. Pada penelitian ini dilakukan sintesis magnetit dari red mud dengan metode kopresipitasi menggunakan reagen pengendap NH4OH. Untuk mengontrol distribusi ukuran partikel yang dihasilkan, digunakan templat cetyltrimethylammoniumbromide (CTAB) dengan konsentrasi 0, 1 dan 2 mM. Karakterisasi magnetit hasil sintesis dilakukan menggunakan metode spektrofotometri inframerah (FTIR), difraksi sinar-X (XRD), pemindaian dengan mikroskop elektron (SEM), dan analisis ukuran partikel (PSA). Hasil penelitian memperlihatkan keberhasilan sintesis magnetit, yang dikonfirmasi melalui spektrum FTIR dan XRD. Vibrasi gugus Fe-O oktahedral dan tetrahedral dari magnetit (Fe3O4) dikarakterisasi melalui bilangan gelombang sekitar 420 cm-1 dan 550 cm-1 pada spektrum FTIR, yang didukung oleh data XRD pada nilai 2q = 30,29 ; 36,15 dan 63,55, masing-masing untuk bidang kristal (220), (311) dan (440) dari kristal magnetit. Hasil PSA menunjukkan bahwa peningkatan konsentrasi CTAB menurunkan rata-rata ukuran partikel dan nilai indeks polidispersi (PI) partikel magnetit. Hal tersebut mengindikasikan terjadinya peningkatan homogenitas dispersi partikel dalam larutan. Namun, nilai PI yang dihasilkan masih relatif tinggi (>1,68) yang diperkirakan akibat terjadinya aglomerasi. Hal tersebut dikonfirmasi melalui hasil SEM yang memperlihatkan aglomerasi pada morfologi permukaan magnetit.

Development of Activated Carbon Material from Oil Palm Empty Fruit Bunch for CO2 Adsorption Irsandi Dwi Oka Kurniawan; Randy Yusuf Kurniawan; Nurul Widiastuti; Lukman Atmaja; Anis Shofiyani
Jurnal Teknik ITS Vol 8, No 2 (2019)
Publisher : Direktorat Riset dan Pengabdian Masyarakat (DRPM), ITS

This study aims to determine the CO2 adsorption capacity of activated carbon doped with nitrogen. Activated carbon is carbonized from oil palm empty fruit bunches (OPEFB). The results of lignocellulose analysis from OPEFB, 42.87 wt% of hemicellulose, 27.31 wt% of lignin, 23.02 wt% of cellulose and 6.80 wt% of ash. Potassium hydroxide is used as an activating agent and urea as a nitrogen precursor with an OPEFB mass: urea is 1: 1 to 1: 5. The method used is single-step, where carbonization-activation-doping is made into one process. Activated activated carbon is characterized by Fourier-Transform Infrared (FTIR), X-ray diffraction (XRD), Brunauer–Emmett–Teller (BET) isotherm, and scanning electron microscope (SEM) with energy dispersive X-ray. Infrared spectra showed that N-doped activated carbon was successfully synthesized. Diffractogram shows an amorphous structure with graphitic plane (002) and (100). ACN11 produces the highest surface area of 1309.47 m2 g-1. The results of gravimetric CO2 adsorption at 30 °C and 1 atm conditions resulted in the largest CO2 adsorption capacity of ACN14 at 15.02 wt%. The ACN11 and ACN14 adsorption kinetics models followed the intraparticle diffusion model with R2 values of 0.95 and 0.97.

SINTESIS MAGNETIT DARI LIMBAH TAMBANG BAUKSIT MENGGUNAKAN TEMPLAT CETYLTRIMETHYLAMMONIUMBROMIDE Syaila Nurhayati; Anis Shofiyani; Titin Anita Zaharah
Jurnal Kimia dan Kemasan Vol. 43 No. 2 Oktober 2021
Publisher : Balai Besar Kimia dan Kemasan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24817/jkk.v43i2.6516

Red mud dari tailing bauksit memiliki komposisi unsur besi cukup tinggi, yang memungkinkannya dijadikan bahan dasar sintesis magnetit. Pada penelitian ini dilakukan sintesis magnetit dari red mud dengan metode kopresipitasi menggunakan reagen pengendap NH4OH. Untuk mengontrol distribusi ukuran partikel yang dihasilkan, digunakan templat cetyltrimethylammoniumbromide (CTAB) dengan konsentrasi 0, 1 dan 2 mM. Karakterisasi magnetit hasil sintesis dilakukan menggunakan metode spektrofotometri inframerah (FTIR), difraksi sinar-X (XRD), pemindaian dengan mikroskop elektron (SEM), dan analisis ukuran partikel (PSA). Hasil penelitian memperlihatkan keberhasilan sintesis magnetit, yang dikonfirmasi melalui spektrum FTIR dan XRD. Vibrasi gugus Fe-O oktahedral dan tetrahedral dari magnetit (Fe3O4) dikarakterisasi melalui bilangan gelombang sekitar 420 cm-1 dan 550 cm-1 pada spektrum FTIR, yang didukung oleh data XRD pada nilai 2q = 30,29 ; 36,15 dan 63,55, masing-masing untuk bidang kristal (220), (311) dan (440) dari kristal magnetit. Hasil PSA menunjukkan bahwa peningkatan konsentrasi CTAB menurunkan rata-rata ukuran partikel dan nilai indeks polidispersi (PI) partikel magnetit. Hal tersebut mengindikasikan terjadinya peningkatan homogenitas dispersi partikel dalam larutan. Namun, nilai PI yang dihasilkan masih relatif tinggi (>1,68) yang diperkirakan akibat terjadinya aglomerasi. Hal tersebut dikonfirmasi melalui hasil SEM yang memperlihatkan aglomerasi pada morfologi permukaan magnetit.

Cadmium Adsorption on Chitosan/Chlorella Biomass Sorbent Prepared by Ionic-Imprinting Technique Anis Shofiyani; Narsito Narsito; Sri Juari Santosa; Sri Noegrohati; Titin Anita Zahara; Endah Sayekti
Indonesian Journal of Chemistry Vol 15, No 2 (2015)
Publisher : Universitas Gadjah Mada

Ionic-Imprinted Chitosan/Chlorella biomass sorbent (IICCb) has been synthesized for selective adsorption of Cd(II) adsorption. IICCb was prepared by coating Cd(II)-complexed-chitosan hydrogel on the biomass surface followed by cross-linking procedure. Cd(II)-imprinting ions were then eluted using Na2EDTA solution to provide a specific template for binding sites of Cd(II). Batch adsorption was carried out as function of initial pH, contact time, and initial concentration of the Cd(II) solution. Result showed that the optimum adsorption of Cd(II) was found at pH 4-6. Study of pseudo-second order kinetic showed that the adsorption of Cd(II) on IICCb went faster than that on Ionic-Imprinted Chitosan (IIC) or Non-Imprinted Ionic Chitosan/Chlorella sorbent (NIICCb). The maximum Cd(II) adsorption capacity as obtained from Langmuir adsorption isotherm was found to be 53.76 mg/g on IICCb, that was comparatively higher than that on IIC (44.44 mg/g) or on NIICCb (51.02 mg/g) adsorbent.

DETERMINATION OF pH EFFECT AND CAPACITY OF HEAVY METALS ADSORPTION BY WATER HYACINTH (Eichhornia crassipes) BIOMASS Anis Shofiyani; Gusrizal Gusrizal
Indonesian Journal of Chemistry Vol 6, No 1 (2006)
Publisher : Universitas Gadjah Mada

Effect of pH and determination of adsorption capacity of Cu(II), Ni(II) and Pb(II) heavy metal ions on adsorbent prepared from Eichhornia crassipes (eceng gondok) biomass has been investigated. The influence of media acidity on the adsorption characteristics was carried out by determining ions adsorbed at various pH in the range of 2-10, while an adsorption isotherm model of Langmuir was used to estimate the capacity of adsorption. Results showed that Cu(II) was optimally adsorbed at the range pH of 5-6, Ni(II) at 2-4, while Pb(II) reached an optimum adsorption at pH 2-3. The adsorption data of Cu(II), Ni(II) and Pb(II) for the adsorbent folowed quite well Langmuir isotherm model, confirmed that such chemisorptions involved on that process. The ions adsorption capacities (am) were 27.47, 16.69, and 15.04 mg/g for Pb(II), Cu(II), and Ni(II), respectively.

ISOLATION OF FLAVONOID FROM ANDONG LEAVES (Cordyline fruticosa (L.) A. Chev.) AND ITS ACTIVITY AS COMPLEXOR OF Fe2+ Herlinda Djohan; Ari Widiyantoro; Anis Shofiyani
Indonesian Journal of Pure and Applied Chemistry Vol 2, No 1 (2019)
Publisher : Tanjungpura University

Flavonoid is one of the phenolic compounds that can complex metals. One of the native plants of Indonesia which has the potential as a metal complexor is the andong plant (Cordyline fruticosa (L.) A.Chev). The isolation process to obtain pure compound are extraction, fractionation, and separation by chromatography. Chromatography method using vacuum liquid chromatography (VLC), gravity column chromatography (GCC) and preparative thin layer chromatography (TLC). This research obtained relatively pure isolate F2.8. The IR (KBr) data on wave numbers of isolate F2.8 were 3430; 2925-2855; 1749; 1609-1512; 1171 and 1100 cm-1.The result of the spectrum 1H-NMR showed flavonoid compound has similar typical spectrum of apigenin compound which showed chemical shift (δH ppm) : 6.85 (1H, s, H-3); 6.29 (1H, s H-6); 6.57 (1H, H-8); 7.03 (2H, d, J = 11.96 Hz, H-3’, H-5’); 8.03 (2H, d, J = 11.72 Hz, H-2’, H-6’). The UV-Vis (CH3OH) spectrum data of isolate F2.8 after the addition of Fe2+ showed a shift at λmax towards a greater direction with a batochromic shift which was caused a decrease in absorbance after the addition of iron (Fe2+) 20 ppm namely: 290 nm; 305 nm with respectively absorbances of 1.62 A; 0.42 A. Based on these data, isolate F2.8 is apigenin which is capable of complexing Fe2+.

PENGARUH WAKTU AGING TERHADAP SIFAT HIDROFOBISITAS SILIKA XEROGEL TERMOFIDIFIKASI TRIMETILKLOROSILAN (EFFECT OF AGING TIME ON THE HYDROPHOBICITY OF SYNTHESIZED TRIMETHYLCHLOROSILANE-MODIFIED SILICA XEROGE) Pendi Wahyudi; Andi Hairil Alimuddin; Anis Shofiyani
Indonesian Journal of Pure and Applied Chemistry Vol 3, No 1 (2020)
Publisher : Tanjungpura University

Silica xerogel is a multi-functional material that is useful in many industrial applications. In this research, we synthesized surface-modified silica xerogel and studied the effect of aging time, i.e., 0, 3, 6, 12, and 18 hours to the hydrophobicity of the synthesized material. The synthesis was conducted by the sol-gel method using sodium silicate precursors and a citric acid catalyst. Meanwhile, the surface modification was carried out through the silylation reaction using trimethylchlorosilane (TMCS) reagent. The resulting materials were characterized using infrared spectrophotometry (FTIR) and X-ray diffraction (XRD) methods. Hydrophobicity was measured by the contact angle formed by the water droplet with the xerogel surface and the spreading time of the droplet to be dispersed entirely on the surface. The silica xerogel produced at all aging time variations has an amorphous phase, characterized by 2θ = 22-26o of the XRD pattern. Si-CH3 and C-H vibrations at 848 cm-1 and 2962 cm-1 present in the FTIR spectrumconfirm the success of surface modification. The increasing aging time enhances the contact angle and spreading time of water droplets on xerogels, viz., 130o to 135o,and 3h 10min to 3h 28 min, respectively. Thus, the xerogels produced by this research are hydrophobic.

Synthesis and Characterization of Trimethylchlorosilane-Modified Silica Xerogel Sellen Tanheitafino; Anis Shofiyani; Risya Sasri; Rudiyansyah Rudiyansyah
Jurnal Kimia Sains dan Aplikasi Vol 23, No 7 (2020): Volume 23 Issue 7 Year 2020
Publisher : Chemistry Department, Faculty of Sciences and Mathematics, Diponegoro University

Modification of silica xerogel with TMCS (trimethylchlorosilane) reagent has been carried out to improve the hydrophobicity of silica xerogel. Silica xerogel was synthesized based on the sol-gel method using sodium silicate as a precursor, and citric acid as a catalyst, with a mole ratio of sodium silicate and citric acid, was 0.172: 0.004. The sol-gel process was carried out through several stages, i.e., hydrolysis and condensation of sodium silicate to form sol, gelation (sol transition to gel), aging, and drying. Surface modification was performed by studying the effect of TMCS: methanol: petroleum benzine volume ratio of 0.5:1:1, 1:1:1, 1.5:1:1, 2:1:1, and 2.5:1:1 on the characteristics of silica xerogel synthesized. FTIR, SEM, and GSA characterized the synthesized results. The results of FTIR characterization on silica xerogel with volume ratios of 2:1:1 and 2.5:1:1 indicate the presence of the Si‑C group absorption at a wavenumber of 848.68 cm-1 which shows that the formation of silyl groups on the modified silica xerogel surfaces occurs at a TMCS: methanol: petroleum benzine ratio of 2:1:1 and 2.5:1:1. SEM results indicate that the silica xerogels produced are porous. Meanwhile, the GSA analysis results show that the pore size distributions are in the mesoporous region with an average pore radius of 8-13 nm. The greater the volume of TMCS used, the higher the surface area, and the resulting xerogel’s hydrophobicity. Based on the contact angle and seeped time test, the highest hydrophobicity is produced by the material synthesized at a TMCS: methanol: PB volume ratio of 2.5:1:1 with a contact angle of 116.346°.

Characteristics of Chlorella sp Biomass Immobilized on Chitosan (Chlo-Kit) for Adsorption of Chromium(III) Solution Titin Anita Zaharah; Anis Shofiyani; Endah Sayekti
ALCHEMY Jurnal Penelitian Kimia Vol 11, No 1 (2015): March
Publisher : UNIVERSITAS SEBELAS MARET (UNS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20961/alchemy.11.1.102.15-28

Properties of biosorbent prepared from biomass of Chlorella sp immobilized on chitosan (Chlo-Kit) have been studied for adsorption of Chromium(III). Chlo-Kit adsorbent prepared by following steps: dissolving chitosan to get hydrogel form, immobilization of biomasson chitosan hydrogel, beads formation and crosslinkingthe adsorbent beads using epichlorohydrin reagent.Characterization using FT-IR spectrophotometry and SEM showed that mechanism of biomass immobilization on chitosan involves electrostatic interactions between the functional groups of such both materials. Biomass immobilized on chitosan (Chlo-Kit) showed the higher stability in acid medium than un-immobilized biomass. Adsorption of Cr(III) metal ion on Chlo-Kit occured at optimum pH of 4-5 and followed well the Langmuir adsorption isotherm model. The adsorption capacity of Cr(III) on Chlo-Kit was 68.965 mg/g, about 91% higher than that on Chlorella biomass

PELATIHAN PEMBUATAN KOMPOS DARI LIMBAH DAUN KERING PADA ANGGOTA KOPERASI KONSUMEN PADAIDI SIPATUO KHATULISTIWA Andi Hairil Alimuddin; Endah Sayekti; Anis Shofiyani; Ajuk Sapar; Rudiyansyah Rudiyansyah; Gusrizal Gusrizal; Titin Anita Zahara; Nelly Wahyuni
Abdimas Galuh Vol 5, No 2 (2023): September 2023
Publisher : Universitas Galuh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25157/ag.v5i2.11055

Koperasi Konsumen Padaidi Sipatuo Khatulistiwa merupakan koperasi skala mikro yang bergerak di bidang perdagangan eceran. Sebagai suatu koperasi yang baru berkembang dan merintis unit usaha, tentunya diperlukan suatu jenis usaha yang mudah, biaya murah dan dapat digunakan oleh berbagai lapisan masyarakat. Salah satu prospek usaha yang dapat dikembangkan adalah pembuatan pupuk kompos dari daun kering. Berdasarkan orientasi yang telah dilakukan oleh tim pengabdi dan konsultasi dengan pengurus koperasi, diperoleh informasi bahwa (1) kegiatan koperasi masih dalam bentuk usaha perdagangan, dan (2) mayoritas anggota koperasi gemar bercocok tanam dan memiliki pekarangan untuk tanaman bunga dan buah-buahan. Solusi terhadap permasalahan koperasi yang ditawarkan tim pengabdi agar dapat menjadi unit usaha ataupun kegiatan usaha dari koperasi serta anggotanya yaitu pengolahan sampah daun kering menjadi pupuk kompos. Ketersediaan bahan baku yang mudah didapat, pengerjaan yang sangat sederhana, serta produk pupuk yang dihasilkan dapat digunakan sendiri atau dapat dijual melalui layanan koperasi. Dalam rangka transfer teknologi tepat guna dalam pembuatan pupuk kompos bagi anggota Koperasi Konsumen Padaidi Sipatuo Khatulistiwa maka metode pelaksanaan yang akan diterapkan dalam bentuk pelatihan yang diawali dengan (1) penyuluhan dan sosialisasi pemanfaatan dan pembuatan pupuk kompos, kemudian dilanjutkan dengan (2) praktek kompos dari daun kering. Tahapan kegiatan diawali dengan penyampaian materi dilanjutkan dengan praktek pembuatan kompos dari daun kering. Peserta pelatihan sangat antusias mengikuti kegiatan ini yang dapat dilihat dari banyaknya pertanyaan dan tingginya perhatian peserta dalam memperhatikan pemaparan tim pengabdi dan praktek pembuatan kompos.

Title

Found 12 Documents
Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title Search

Found 12 Documents Search

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Abstract

Title

Found 12 Documents
Search