Geothermal industry waste-derived catalyst for enhanced biohydrogen production

Munfarida, Siti; Widayat, Widayat; Satriadi, Hantoro; Cahyono, Bambang; Hadiyanto, Hadiyanto; Philia, John; Prameswari, Jedy

doi:10.1016/j.chemosphere.2020.127274

Cited by 14 publications

(6 citation statements)

References 17 publications

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“…The metal oxide content of the waste is presented in Table 2. Two main elements, SiO 2 and Al 2 O 3 , are parameters for the feasibility of utilizing geothermal waste in the zeolite synthesis process [23]. The synthesis of zeolite is very sensitive to feedstock properties, especially from silica and alumina sources.…”

Section: Synthesis Of Zeolite From Geothermal Solid Wastementioning

confidence: 99%

Effect of Temperature and Concentration of Zeolite Catalysts from Geothermal Solid Waste in Biodiesel Production from Used Cooking Oil by Esterification–Transesterification Process

et al. 2020

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The production of biodiesel using zeolite catalysts from geothermal solid waste has been studied. This study aims to make zeolite catalysts as catalysts in biodiesel production, assessing the effect of catalyst concentration, and temperature in the esterification–transesterification process on the biodiesel yield produced. The results showed that the synthesized zeolite catalyst was an analcime zeolite catalyst (Al1.9Na1.86O12Si4). The biodiesel yield of 98.299% with 100% fatty acid alkyl ester (FAAE) content was achieved at a catalyst concentration of 5%wt and a reaction temperature of 300 °C for one-hour reaction time. The yield of biodiesel decreased with repeated catalysts, which experienced morphological changes before and after three usage times. Consequently, in this case, the catalyst cannot be regenerated.

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Section: Synthesis Of Zeolite From Geothermal Solid Wastementioning

confidence: 99%

Effect of Temperature and Concentration of Zeolite Catalysts from Geothermal Solid Waste in Biodiesel Production from Used Cooking Oil by Esterification–Transesterification Process

et al. 2020

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“…Logam berat bersifat toksik karena tidak dapat didegradasi oleh organisme di lingkungan (Widowati et al, 2008). Urutan toksisitas logam berat yang menimbulkan gangguan kesehatan manusia adalah Hg > Cd > Ag > Ni > Pb > As > Cr > Sn > Zn (Munfarida, 2016). Logam berat yang masuk ke lingkungan atau masuk ke dalam tubuh manusia tidak dapat dihancurkan, namun tetap akan menumpuk dan mencemari lingkungan atau meracuni tubuh manusia.…”

Section: Pendahuluanunclassified

Presipitasi Logam Berat Limbah Cair Laboratorium Menggunakan Natrium Sulfida Dari Belerang Alam

Anami¹,

Maslahat²,

Arrisujaya

2020

Sains Natural

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Precipitation of Laboratory Wastewater Heavy Metals by Natural Sulphur Sodium Sulfide Sodium sulfide (Na2S) from natural sulfur has been used for heavy metal precipitation from laboratory wastewater. Heavy metals in laboratory wastewater include mercury (Hg), lead (Pb), chromium (Cr) and zinc (Zn). Initial laboratory wastewater testing was performed by measuring the initial pH and the concentration of heavy metals in the wastewater prior to precipitation using the atomic absorption spectrophotometer. Sulphide precipitation phase consists of variations in the concentration of NaOH, time, temperature, and volume of dissolving Na2S. Parameters for the efficiency of Hg, Pb, Zn and Cr heavy metal precipitation were the initial pH, concentration and rate of stirring of the solution. Results showed that the optimum precipitation efficiency for Zn is achieved by using 10 % Na2S solution with an efficiency of 97.93 %. The most significant reduction in Cr and Hg was the use of 20 % Na2S solution with a precipitation efficiency of 99.24 % and 99.76 % respectively. The optimal efficiency for Pb with a 30 % Na2S solution was 99.68 %. Natural sulfur can reduce the levels of heavy metals in laboratory wastewater by precipitation.Key words: Natural sulfur, Heavy metals, Precipitation, Sodium sulfide, ABSTRAKPresipitasi logam berat dari limbah cair laboratorium telah dilakukan dengan menggunakan natrium sulfida (Na2S) dari belerang alam. Logam berat yang terkandung dalam limbah cair laboratorium diantaranya adalah merkuri (Hg), timbal (Pb), kromium (Cr) dan seng (Zn). Pengujian awal limbah laboratorium dilakukan dengan mengukur pH awal dan kadar logam berat yang terdapat dalam limbah sebelum presipitasi menggunakan pH meter dan spektrofotometer serapan atom. Tahapan presipitasi limbah oleh sulfida meliputi pembuatan variasi konsentrasi NaOH, waktu, suhu, dan volume pelarutan Na2S. Parameter efisiensi presipitasi logam Hg, Pb, Zn, dan Cr meliputi pH, Konsentrasi dan Kecepatan pengadukan. Hasil penelitian menunjukkan efisiensi pengendapan optimal untuk logam Zn terdapat pada penggunaan larutan Na2S 10% dengan efisiensi 97,93%. Larutan Na2S 20% paling banyak menurunkan logam Cr dan Hg dengan efisiensi masing-masing sebesar 99,24% dan99,76%. Efisiensi optimal untuk logam Pb berada pada penggunaan larutan Na2S 30% dengan efisiensi 99,68%. Belerang alam mampu menurunkan kadar logam berat dalam limbah cair laboratorium dengan metode presipitasi.Kata kunci: Belerang alam, Logam berat, Presipitasi, Natrium sulfida

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“…Developed and developing countries are still very dependent on the use of fossil fuels, even though prolonged use of these fuels causes air pollution and global warming [1,2]. About 85% of the world's energy needs are still met by fossil fuels [3,4].…”

Section: Introductionmentioning

confidence: 99%

Effect of Temperature and Tapioca Flour Concentration on Manufacture of CaO·SiO2 Heterogeneous Catalyst Pellets Made from Brick Burning Ash for Biodiesel Synthesis

et al. 2023

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Solid catalysts are the best choice for an effective large-scale biodiesel production process. This study aimed to analyze the characteristics of catalysts due to the influence of variations in sintering temperature and binder composition on heterogeneous catalysts of CaO·SiO2 pellets made from brick-burning residue. The catalyst was made by the sol-gel method with silica insoles with 5% KOH solvent, CaO soles with HNO3 solvent of 1.5 N, and a CaO: SiO2 ratio of 1:5. The amount of tapioca flour binders was 1%, 2%, 3%, 4%, and 5%. The resulting gel was made into a catalyst powder, sintered at various temperatures of 600 °C, 700 °C, 800 °C, 900 °C, and 1000 °C, then pelleted with a hydraulic press with a diameter of 9 mm. Catalysts were tested with density test, hardness test, PSA, XRF, XRD, and SEM. The characteristics of the CaO·SiO2 catalysts were influenced by the composition of the binding material and the sintering temperature. The test results show that the influence of variations in the composition of the binder fluctuates because the characteristics of the catalyst are also affected by the compaction process. The higher the sintering temperature, the better the catalyst will be, but if the temperature is too high it can cause agglomeration.

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Geothermal industry waste-derived catalyst for enhanced biohydrogen production

Cited by 14 publications

References 17 publications

Effect of Temperature and Concentration of Zeolite Catalysts from Geothermal Solid Waste in Biodiesel Production from Used Cooking Oil by Esterification–Transesterification Process

Effect of Temperature and Concentration of Zeolite Catalysts from Geothermal Solid Waste in Biodiesel Production from Used Cooking Oil by Esterification–Transesterification Process

Presipitasi Logam Berat Limbah Cair Laboratorium Menggunakan Natrium Sulfida Dari Belerang Alam

Effect of Temperature and Tapioca Flour Concentration on Manufacture of CaO·SiO2 Heterogeneous Catalyst Pellets Made from Brick Burning Ash for Biodiesel Synthesis

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