Green Synthesis Pigmen Hematit dari limbah bubut besi menggunakan ekstrak daun jambu biji (Psidium Guava) (sertifikat hak cipta)

Hematit berhasil disintesis dari limbah bubut besi dengan ekstrak daun jambu biji. Limbah bubut tersebut dihasilkan dari industry kerajinan besi yang memiliki kandungan besi sebesar 97% yang berpotensi sebagai prekursor dalam sintesis hematit. Metode yang diterapkan dalam sintesis ini adalah metode presipitasi-kalsinasi. Karakterisasi dalam penelitian ini meliputi XRF, XRD, FTIR, Color reader dan SEM. Hasil XRD menunjukkan bahwa dari hasil sintesis sebelum kalsinasi didapatkan strutur hematit dengan kemurnian rendah dan masih amorf. Sedangkan dari hasil sintesis setelah kalsinasi didapatkan struktur hematit dengan geometri rhombohedral. Hasil FTIR menunjukkan bahwa produk sebelum kalsinasi terdapat gugus OH, C=O, dan Fe-O, sedangkan produk setelah kalsinasi menunjukkan bahwa hanya terbentuk serapan Fe-O di bilangan 519.14 dan 433.57 cm-1. Hasil color reader menunjukkan bahwa produk sebelum kalsinasi menghasilkan nilai Hue diluar nilai hematit yaitu antara 60-78 sedangkan produk setelah kalsinasi baik nilai L*, a*. b*, C, dan H menunjukkan nilai warna sesuai standar. Hasil karakterisasi SEM menunjukkan bahwa produk hasil sintesis pada semua variasi setelah kalsinasi berbentuk kotak dengan distribusi ukuran partikel pada variasi 1:1 (286 nm), 1:2 (253 nm), 1:3 (64 nm), 1:4 (251nm)

Synthesis and application of hematite from lathe waste as anti-swelling on wood

Hematite is one of iron oxide, which potentially in reducing swelling wood. The cellulose content in wood easily binds with hydrogen that causing swelling. Hematite was synthesized from iron lathe waste via ferric precursor by a precipitation-calcination method. The product synthesized is characterized using X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Fourier Transform – Infrared Spectroscopy (FT-IR), color reader. The hematite pigmented wood powder analyzed swelling ratio to know the ability to reduce swelling. XRD data and FT-IR spectrum confirmed that after calcination obtained hematite. SEM image revealed the shape of hematite was spherical and uniform. Color reader data showed that product calcined got chroma, hue, lightness, degree of redness, and yellowness according to hematite standard. Swelling ratio analysis resulted that wood powder after interaction with hematite using H2SO4 solvent did not swell, and using methanol solvent was swelled power after 8 hours of 4.76%

Green Synthesis Pigmen Hematit dari limbah bubut besi menggunakan ekstrak daun jambu biji (Psidium Guava) (sertifikat hak cipta)

Hematit berhasil disintesis dari limbah bubut besi dengan ekstrak daun jambu biji. Limbah bubut tersebut dihasilkan dari industry kerajinan besi yang memiliki kandungan besi sebesar 97% yang berpotensi sebagai prekursor dalam sintesis hematit. Metode yang diterapkan dalam sintesis ini adalah metode presipitasi-kalsinasi. Karakterisasi dalam penelitian ini meliputi XRF, XRD, FTIR, Color reader dan SEM. Hasil XRD menunjukkan bahwa dari hasil sintesis sebelum kalsinasi didapatkan strutur hematit dengan kemurnian rendah dan masih amorf. Sedangkan dari hasil sintesis setelah kalsinasi didapatkan struktur hematit dengan geometri rhombohedral. Hasil FTIR menunjukkan bahwa produk sebelum kalsinasi terdapat gugus OH, C=O, dan Fe-O, sedangkan produk setelah kalsinasi menunjukkan bahwa hanya terbentuk serapan Fe-O di bilangan 519.14 dan 433.57 cm-1. Hasil color reader menunjukkan bahwa produk sebelum kalsinasi menghasilkan nilai Hue diluar nilai hematit yaitu antara 60-78 sedangkan produk setelah kalsinasi baik nilai L*, a*. b*, C, dan H menunjukkan nilai warna sesuai standar. Hasil karakterisasi SEM menunjukkan bahwa produk hasil sintesis pada semua variasi setelah kalsinasi berbentuk kotak dengan distribusi ukuran partikel pada variasi 1:1 (286 nm), 1:2 (253 nm), 1:3 (64 nm), 1:4 (251nm)

Sintesis pigmen geothit (α-FeOOH) dari limbah industri kerajinan besi dengan metode presipitasi

Iron handicraft is one of industries that process iron ore into handicraft products and produce lathe waste. Iron lathe contains 96.08% iron metal which is potential source as a precursor for synthesis of goethite pigment. The method used for synthesis was precipitation using NaHCO3 as precipitator agent. Synthesis was conducted at 70°C with variations of stirring speed such as 550, 650, 750 and 850 rpm. The products were characterized by color reader, ultraviolet-visible (UV-Vis) spectroscopy, XRD and SEM-EDX. The data from color reader showed that the highest yellowness degree and lightness obtained at a stirring speed 550 rpm were 24.1 and 42.1, respectively. UV-Vis data showed that the maximum wavelength of goethite pigment was 600-624 nm. Based on XRD data, synthesized pigment was in goethite phase (α-FeOOH) for all samples with crystallite size 63.24 nm and the highest crystallinity was achieved at 550 rpm. SEM-EDX data showed that morphology pigment (α-FeOOH) was not uniform, there were impurities such as Na and C

Kit pendeteksi boraks dari bunga telang (sertifikat hak cipta)

Kit pendeteksi boraks dari bunga telang merupakan kit yang dibuat dari ekstrak bunga telang yang dapat digunakan untuk mendeteksi adanya zat aditif berbahaya dalam makanan yaitu boraks. Test kit dari bunga telang merupakan alat test yang fungsi dan proses pembuatannya sejalan dengan roadmap penelitian Prodi Kimia yaitu produk halal, natural farmako, serta energi dan lingkungan. Prinsip kerja test kit ini dalam mendeteksi adanya boraks dalam makanan yaitu jika makanan positif mengandung boraks, maka kit akan berubah warna dari biru menjadi hijau dimana intensitas warna yang dihasilkan sesuai dengan konsentrasi boraks dalam makanan. Semakin besar kandungan boraks dalam makanan, maka warna kit semakin hijau

Synthesis and characterization of alginate-carboxymethil cellulose beads from corn stalk (Zea mays) with crosslink variation C4H6O4Zn

Cornstalk has a high cellulose content so that it is potential to be used as a composition for making alginate-carboxymethyl cellulose beads. Alginate and cellulose are biodegradable, renewable and non-meltable polymers that have wide applications in various industrial sectors. The purpose of this study was to determine the effect of crosslinking agent C4H6O4Zn on the adsorption and shape of beads. The varied concentrations of C4H6O4Zn are 3%; 5% and 10%. Characterization of alginate-carboxymethyl cellulose beads composites using Fourier Transform InfraRed (FTIR), and Scanning Electron Microscope-Energy Dispersive X-Ray (SEM-EDX). Based on research, the highest swelling value is obtained at 5% C4H6O4Zn crosslink which is 59.68%. FTIR data shows the appearance of wave numbers at 1413 cm-1 which indicates the presence of C-O Na groups, while at wave number 458 cm-1 indicates the presence of Zn-O groups. SEM-EDX data with a 5% C4H6O4Zn crosslink has a round shape with a wrinkled surface, multiple grooves causing a non-homogeneous surface. Whereas in C4H6O4Zn 10% the surface is almost smoot

Kit pendeteksi boraks dari bunga telang (sertifikat hak cipta)

Kit pendeteksi boraks dari bunga telang merupakan kit yang dibuat dari ekstrak bunga telang yang dapat digunakan untuk mendeteksi adanya zat aditif berbahaya dalam makanan yaitu boraks. Test kit dari bunga telang merupakan alat test yang fungsi dan proses pembuatannya sejalan dengan roadmap penelitian Prodi Kimia yaitu produk halal, natural farmako, serta energi dan lingkungan. Prinsip kerja test kit ini dalam mendeteksi adanya boraks dalam makanan yaitu jika makanan positif mengandung boraks, maka kit akan berubah warna dari biru menjadi hijau dimana intensitas warna yang dihasilkan sesuai dengan konsentrasi boraks dalam makanan. Semakin besar kandungan boraks dalam makanan, maka warna kit semakin hijau

Synthesis of goethite (α-FeOOH) pigment by precipitation method from iron lathe waste

Lathe waste contains high iron content potential to be further processed into goethite pigment. The purpose of the research was to determine the effect of synthesis temperature on the structure, colour values, and morphology of goethite pigment. The synthesis was conducted with temperature variations of 60, 70, 80 and 90°C. The XRD diffraction pattern shows that crystal structure of the product of all synthesis temperatures are goethite (α-Fe-OOH) with orthorhombic structure. The crystal size of the pigment ranges between 11.17 – 12.32 nm. Colour value analysis shows that product of 70°C synthesis temperature exhibits the highest lightness value about 40.5. Based on SEM-EDX imaging, the morphology of the samples is not uniform and forming agglomerates. Traces of impurities were detected, such as C and Na

Structure and morphology properties of nanoparticle hematite pigment from lathe waste

Hematite coated PEG was synthesized by the sonication-calcination method. A variation of Na2CO3 is investigated to know the effect on structure and morphology. Characterization of samples are using X-ray fluorescence, X-ray diffraction, Scanning electron microscopy, and color reader techniques. XRF data showed that iron is the highest element in the precursor. The X-ray diffraction data confirm that Fe(OH)3, α-FeOOH, and Fe3O4 established at the sonication stage are then transformed into the α-Fe2O3 phase after calcination. The X-ray diffraction data also was found that α-Fe2O3 at 0.5 M formed with the highest crystallinity degree. The scanning electron microscopy showed that the particle's shape is spherical, bar-shaped, and aggregate. However, the distribution of particles is not uniform and still displays agglomeration. The Color reader shows the highest degree of lightness obtained is at 1 M variation

Variation of alginate: carboxymethyl cellulose on making beads CMC from cellulose of corn stalk

Synthesize CMC uses cellulose extracted from cornstalk waste. FTIR and XRD characterize CMC synthesize. Alginate: CMC (AC) beads made by dropping technique through the ionic gelation method with crosslinking CaCl2 3%. Fourier Transform Infra-Red (FTIR) to know the AC’s function group, swelling test to know the swelling power, and SEM-EDX to see the surface characteristics. The optimum composition of AC composite beads was 1:2 based on beads’ formation, the highest swelling power value 175.5%, and the diameter was 26.64%. The data FTIR AC showed that wave number at 819 cm-1 indicates the presence of Ca-alginate linkage. The SEM-EDX of AC without CMC 1:0 showed a smooth surface, while the surfacer character of AC 1:2 is roug