Papers by Wahyu Fajar Winata
Effectiveness of activated carbon magnetic composite from banana peel (Musa acuminata) for recovering iron metal ions
Case studies in chemical and environmental engineering, Dec 1, 2023
Sheep skin tanning has been carried out using a combination tanning material, namely 4% Aluminum ... more Sheep skin tanning has been carried out using a combination tanning material, namely 4% Aluminum and 6% Mimosa. Raw materials in the form of raw sheep skin weighing 2 kg. BHO, tanning, and post tanning processes are carried out to produce crust skin. The physical test characteristics are 0.7 mm thickness, 6 mm softness, 27.8 N/mm2 transverse tensile strength, 17.8 N/mm2 longitudinal tensile strength, 48.5 % transverse elongation, 45.8 % longitudinal elongation, 19.1 N/mm 2 transverse tear strength, 18.9 N/mm 2 longitudinal tear strength, and shrinkage temperature (Ts) 89 o C. The physical test results were compared with the SNI 4593-2011 standard for sheep leather jackets. The results meet the SNI for sheep leather jackets.
Rasayan journal of Chemistry, 2020
Intercalation of gallic acid (GA) on Mg/Al-HT has been performed by direct co-precipitation metho... more Intercalation of gallic acid (GA) on Mg/Al-HT has been performed by direct co-precipitation method of Mg(NO 3) 2 , Al(NO 3) 2 and GA at various molar ratios. The intercalation products of GA in Mg/Al-HT-GA were characterized by infrared spectrophotometer and XRD diffractometer. The effects of molar ratio variations on the synthesis of Mg/Al-HT-GA and adsorption capacity of Au(III) were also studied. The analysis using an infrared spectrometer and XRD diffractometer showed that GA had been intercalated in the interlayer of Mg/Al-HT with the value of d (basal spacing d 003) increased with increasing of the concentration of GA. The adsorption of Au(III) by Mg/Al-HT-GA synthetized was optimum at pH 10 and variation of Mg:Al:GA=2:1:0.5 with the adsorption capacity of 90.1%.
Journal of The Indonesian Chemical Society, Dec 30, 2020
Ethoxy ethane, or diethyl ether, has been successfully synthesized through the condensation react... more Ethoxy ethane, or diethyl ether, has been successfully synthesized through the condensation reaction of bioethanol produced from fruit waste fermentation using acid-activated H-Zeolite, H2SO4/H-Zeolite, and H2SO4 as catalysts. Zeolite activation was carried out using the acidification method with 1 M, 2 M, 4 M, and 6 M H2SO4 for 24 hours. Activated zeolites were characterized using infrared spectroscopy, X-ray diffraction, and NaOH titration. The condensation reaction of bioethanol was carried out by catalysis of H2SO4/H-Zeolite with various concentrations of 1 M, 2 M, 4 M, and 6 M and catalyzed by 2 M, 4 M, and 6 M acid-activated H-Zeolite. The condensation reaction process was carried out with a ratio of bioethanol to catalyst of 2:1 (w/w) using the fractional distillation method. Ethoxy ethane resulting from the condensation reaction was characterized using a GC instrument.
Konversi Bioetanol Dari Sampah Buah Menjadi Etoksietana Melalui Proses Reaksi Kondensasi Terkatalisisasam Sulfat Dan H-Zeolit;Bioethanol Conversion from Fruit Waste to Ethoxyethane Trough Condensation Reaction Processcatalized by Sulfuric Acid and H-Zeolite
Universitas Gadjah Mada, 2012
Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit, Feb 29, 2020
This research aims to utilize BHO tannery liquid waste for biogas production and to examine the e... more This research aims to utilize BHO tannery liquid waste for biogas production and to examine the effect of active digester effluent on the co-digestion of biogas production by co-digestion of BHO liquid waste and cow manure. The experiment began with an analysis of the character of the leather tanning BHO liquid waste. The biogas production is carried out in batches in an anaerobic biogas digester. The experiment was started by entering raw materials for BHO liquid waste: cow dung: active digester effluent with a ratio of D1 = 4: 2: 0; D2 = 4: 0: 2; D3 = 6: 0: 0. Observation of the addition of gas was carried out by means of a manometer to measure the increase in gas pressure produced in the digester every day until the 15th day. The results of the analysis of BHO wastewater showed high BOD and COD levels, namely 3265 mg / L and 11231.2 mg / L. The results of making biogas show increased gas pressure (gas formation) in digester D1 and D2. The result of D1 (BHO waste without starter) gas production is a lot at the beginning and then decreases. In D2 (BHO waste with the addition of starter and cow dung), it shows that gas production is formed on the 8th day with constant pressure until the 15th day and is still producing. In the D3 digester (BHO liquid waste without a starter and cow dung) no gas is formed.
INDONESIAN JOURNAL OF CHEMICAL RESEARCH, 2020
Recovery Cu(II) dan Pb(II) yang sebagian besar terkandung dalam limbah cair industri, baik indust... more Recovery Cu(II) dan Pb(II) yang sebagian besar terkandung dalam limbah cair industri, baik industri besar maupun rumah tangga telah dilakukan, salah satunya adalah dengan proses adsorpsi. Penelitian ini dilakukan studi kinetika adsorpsi Cu(II) dan Pb(II) dalam limbah cair untuk mengetahui efektivitas biosorben dari ekstrak kulit buah rambutan terhadap limbah cair yang mengandung Cu(II) dan Pb(II). Penentuan kinetika adsorpsi Cu(II) dan Pb(II) dengan menggunakan biosorben dari ekstrak kulit buah rambutan dilakukan melalui beberapa model kinetika yaitu model kinetika Langmuir-Hinshelwood, Santosa, Lagergreen dan Ho. Kinetika adsorpsi Cu(II) dan Pb(II) semuanya mengikuti model kinetika Ho, yang merupakan mekanisme kinetika orde dua semu.
Bentonite-Biochar Combination for Manganese Ion Removal from Water
Advanced Materials Research, 2021
Peat waters were abundant in the West Tanjung Jabung Regency of Jambi Province. Peat water contai... more Peat waters were abundant in the West Tanjung Jabung Regency of Jambi Province. Peat water contains manganese metal ion concentration that exceeds the clean water quality standard. Previous studies have been conducted to reduce levels of manganese in peat water, but the results have not been significant. This study aims to reduce levels of Manganese metal in peat water using the composition of Bentonite and Biochar. The adsorption process was carried out at room temperature (29 °C) with a stirring of 200 rpm. Some parameters measured were optimum pH of adsorption, optimum contact time and the best combination between Bentonite and Biochar. Manganese ion concentration in solution was measured using atomic absorption spectroscopy (AAS). The results of this study indicate that the optimum conditions for removing manganese ion at pH 5 and contact time 40 minutes. Tests on artificial solutions using 0.2 grams of biochar showed Mn ion removal of 42.91% (C0 = 100 mg/L, Ce = 57.09 mg/L, V =...
Asian Journal of Chemistry, 2018
The effect of temperature on the extraction process of nephelium peel in the modification nepheli... more The effect of temperature on the extraction process of nephelium peel in the modification nephelium tannin based biosorbent (NTBB) from the nephelium peel was done by varying the temperature of the extraction. Modified nephelium tannin based biosorbent carried by the cross-linker using formaldehyde and performed stability of nephelium tannin based biosorbent by varying the pH system. The results of cross-link process between tannin extract and formaldehyde compounds to produce nephelium tannin based biosorbent which were characterized using infrared spectrophotometer. The characterization result by infrared spectrophotometer shown extraction temperature of tannin from the nephelium peel affected the formation of nephelium tannin based biosorbent functional groups. The higher extraction temperature cause HCN will be released and attached on nephelium tannin based biosorbent polymer that was detected by IR spectra. The stability of nephelium tannin based biosorbent in solution shows that nephelium tannin based biosorbent will easily dissolve in the system of high acidity so that it will form a high peak at a wavelength of 240-280 nm using a UV-visible spectrophotometer, where nephelium tannin based biosorbent optimum stability in solution occurs at pH 5.
Application of Mg/Al-hidrotalcite to reduce Cu(II) and Pb(II) metals in ground water in the environment of a used battery home industry at Pesarean Village, Tegal, Central Java
AIP Conference Proceedings, 2020
Adsorption of Fe(III) on the biosorbent from polymerization process of nephelium fruit peel extract
Adsorption of Fe(III) on the biosorbent from polymerization of nephelium fruit peel extract with ... more Adsorption of Fe(III) on the biosorbent from polymerization of nephelium fruit peel extract with aldehyde was carried out under acidic conditions (pH=5). The adsorption process was carried out to determine adsorption equilibrium, kinetics study, capacity (qe) and adsorption constants of Fe(III) adsorption on the biosorbent. The adsorption equilibrium was obtained after 10 minutes of the adsorption process. The kinetic model of Fe(III) adsorption at the pH solution condition pH=5 followed the kinetics model from Ho which is pseudo-second order with the qe value of 40.65 mg.g−1 and the adsorption rate constant (h) of 3.33 × 103 mg.g−1.min−1.Adsorption of Fe(III) on the biosorbent from polymerization of nephelium fruit peel extract with aldehyde was carried out under acidic conditions (pH=5). The adsorption process was carried out to determine adsorption equilibrium, kinetics study, capacity (qe) and adsorption constants of Fe(III) adsorption on the biosorbent. The adsorption equilibrium was obtained after 10 minutes of the adsorption process. The kinetic model of Fe(III) adsorption at the pH solution condition pH=5 followed the kinetics model from Ho which is pseudo-second order with the qe value of 40.65 mg.g−1 and the adsorption rate constant (h) of 3.33 × 103 mg.g−1.min−1.
Modification of humic acid on the phenolic functional group with dimethylsulfate (DMS) for adsorp... more Modification of humic acid on the phenolic functional group with dimethylsulfate (DMS) for adsorption Au(III) in the presence of Sn(II) and Ni(II) have been conducted. Ash content was analyzed and characterized by Fourier-Transform Infrared (FTIR). Determination of Au(III) adsorption in the presence of Sn(II) and Ni(II) was conducted by Atomic Adsorption Spectroscopy (AAS). The isolated humic acid has 19.8% ash content and after purification has 0.6% ash content, etherified humic acid (EHAs) has 1.4% ash content. Adsorption percentage of Au(III) in the presence of Sn(II) and Ni(II) by EHAs decreased until 4.936% and 41.782% respectively. The addition of Sn(II) and Ni(II) as competitors of Au(III) in the Au(III) adsorption by using EHAs, were affect the percentage of Au(III) adsorption.
Konversi Bioetanol Dari Sampah Buah Menjadi Etoksietana Melalui Proses Reaksi Kondensasi Terkatalisisasam Sulfat Dan H-Zeolit;Bioethanol Conversion from Fruit Waste to Ethoxyethane Trough Condensation Reaction Processcatalized by Sulfuric Acid and H-Zeolite
Berkala Penelitian Teknologi Kulit, Sepatu, dan Produk Kulit
This study aims to make chromium and water more efficient in the tanning process. The methods us... more This study aims to make chromium and water more efficient in the tanning process. The methods used include water efficiency from 100% to 50% and chromium reduction from 6% to 4% using exhausted chrome tanning method. The raw material used is grade 6 pikel sheepskin and the auxiliary chemical used is acrylic copolymer. The tests carried out were organoleptic, physical and chromium content in the waste. Organoleptic and physical tests showed that the condition of slackness, and the suitability of color on the crust of the pearl white cabretta article had met consumer purchasing standards. In the results of physical testing of samples using the exhausted chrome tanning method, almost all of them meet the test standards from SII-0943-84. Waste testing showed that the use of the efficiency method had a significant decrease in the amount of total chromium, from 757.35 mg/L to 487.80 mg/L.
IOP Publishing, 2019
Utilization of hydrotalcite modified with 3,4,5-trihydroxybenzoic acid as a medium for the treatm... more Utilization of hydrotalcite modified with 3,4,5-trihydroxybenzoic acid as a medium for the treatment of silver-containing wastewater has been done by using adsorption method. The modified hydrotalcite was prepared by direct precipitation using Mg and Al metals precursor and an organic compound of 3,4,5-trihydroxybenzoic acid. The modified material was then used for the treatment of silver-containing wastewater through adsorption method together with the determination of adsorption capacity, kinetics study as well as the material characterization after the treatment process. It could be observed from the results that the adsorption of silver onto the modified hydrotalcite was in accordance with Langmuir adsorption model with the adsorption capacity (qmax) of 400 mg.g-1. Moreover, the adsorption kinetics of the treatment showed that the process followed the kinetics model of pseudo-second-order of Ho with the velocity constant (k) of 1.15x10-4 g.mg-1 .minute-1. The adsorption process exhibited an exergonic property with the adsorption energy of 28.10x10 3 J.mol-1. All of the adsorption processes were conducted in the condition of pHadsorption = 3. Meanwhile, results from the characterization using FTIR showed the functional groups of C=C,-OH and NO3on the modified hydrotalcite underwent some alteration after the adsorption process of Ag(I). Therefore it can be observed that the functional groups of COOH and OH had an important role in the adsorption of silver from wastewater.
AIP Conf. Proc. 1823, 020103-1–020103-5, 2017
The novel kinetics expression of Cadmium (II) removal using green adsorbent horse dung humic acid... more The novel kinetics expression of Cadmium (II) removal using green adsorbent horse dung humic acid (Hd-Ha) AIP Conference Proceedings 1823, 020001 (2017); 10.1063/1.4978074 Analysis of 16S rRNA gene lactic acid bacteria (LAB) isolate from Markisa fruit (Passiflora sp.) as a producer of protease enzyme and probiotics
ASIAN JOURNAL OF CHEMISTRY ASIAN JOURNAL OF CHEMISTRY, 2017
The effect of temperature on the extraction process of nephelium peel in the modification nepheli... more The effect of temperature on the extraction process of nephelium peel in the modification nephelium tannin based biosorbent (NTBB) from the nephelium peel was done by varying the temperature of the extraction. Modified nephelium tannin based biosorbent carried by the cross-linker using formaldehyde and performed stability of nephelium tannin based biosorbent by varying the pH system. The results of cross-link process between tannin extract and formaldehyde compounds to produce nephelium tannin based biosorbent which were characterized using infrared spectrophotometer. The characterization result by infrared spectrophotometer shown extraction temperature of tannin from the nephelium peel affected the formation of nephelium tannin based biosorbent functional groups. The higher extraction temperature cause HCN will be released and attached on nephelium tannin based biosorbent polymer that was detected by IR spectra. The stability of nephelium tannin based biosorbent in solution shows that nephelium tannin based biosorbent will easily dissolve in the system of high acidity so that it will form a high peak at a wavelength of 240-280 nm using a UV-visible spectrophotometer, where nephelium tannin based biosorbent optimum stability in solution occurs at pH 5.
2nd International Conference on Chemistry, Chemical Process and Engineering (IC3PE), 2018
Adsorption of Fe(III) on the biosorbent from polymerization of nephelium fruit peel extract with ... more Adsorption of Fe(III) on the biosorbent from polymerization of nephelium fruit peel extract with aldehyde was carried out under acidic conditions (pH=5). The adsorption process was carried out to determine adsorption equilibrium, kinetics study, capacity (q e) and adsorption constants of Fe(III) adsorption on the biosorbent. The adsorption equilibrium was obtained after 10 minutes of the adsorption process. The kinetic model of Fe(III) adsorption at the pH solution condition pH=5 followed the kinetics model from Ho which is pseudo-second order with the qe value of 40.65 mg.g-1 and the adsorption rate constant (h) of 3.33x10 3 mg.g-1 .min-1 .
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Papers by Wahyu Fajar Winata