scholarly journals Biosorpsi Kromium (Cr) Pada Limbah Cair Industri Elektroplating Menggunakan Biomassa Ragi Roti (Saccharomyces cerevisiae)

Jurnal Dampak ◽  
2018 ◽  
Vol 15 (1) ◽  
pp. 1
Author(s):  
Shinta Elystia ◽  
Resna Rauda Putri ◽  
Sri Rezeki Muria
Keyword(s):  
Heavy Metals ◽  
Saccharomyces Cerevisiae ◽  
Contact Time ◽  
Liquid Waste ◽  
Mesh Size ◽  
Sample Surface ◽  
Sem Analysis ◽  
Biosorption Process ◽  
Before And After ◽  
The Difference

Electroplating industry is one of the industries producing liquid waste containing heavy metals. Among the heavy metals contained in the liquid waste is Chromium (Cr) which has a high toxicity. One technology that can be applied to eliminate Cr metal in liquid waste is by the method Biosorption using biomass derived from yeast bread (Saccharomyces cerevisiae). This study aimed to study the ability of bread yeast biomass (saccharomyces cerevisiae) in removing Cr metal on variations in biosorbent weight of 0.25; 0.5 and 0.75 grams, mesh size 80; 100 and 140 and contact time 1; 2; 3 and 4 hours. The results showed that the highest Cr removing efficiency occurred at 0.75 g biosorbent weight at 80 mesh and 4 hours contact time with efficiency of 54.7%. The biosorption process indicates that the adsorption isotherm type obtained is Langmuir isotherms assumed that the layer formed is monolayer with R2 value of 0.8819. The SEM analysis results show the difference of the morphological shape on the sample surface before and after the biosorption process

scholarly journals IMMOBILIZATION OF Saccharomycess cereviceae BIOMASS ON CHITOSAN AND ITS APPLICATION AS AN ADSORBENT FOR Pb(II) ION

2011 ◽  
Vol 11 (2) ◽  
pp. 174-179 ◽  
Author(s):  
Hasri Hasri ◽  
Mudasir Mudasir ◽  
Nurul Hidayat Aprilita ◽  
Roto Roto
Keyword(s):  
Optimum Condition ◽  
Functional Groups ◽  
Contact Time ◽  
Metal Ion ◽  
Mass Ratio ◽  
Adsorption Experiment ◽  
Ion Removal ◽  
Before And After ◽  
The Difference

An application of Saccharomycess cereviceae biomass immobilized on chitosan (SC-Chi adsorbent) for Pb(II) ion removal was demonstrated. Adsorption experiment was conducted at various mass ratio of Saccharomycess cereviceae biomass to chitosan, contact time, pH of solution and concentration of cation. Total Pb(II) metal ion adsorbed was calculated from the difference of the amount of metal ion before and after adsorption which was measured by AAS. The results showed that optimum condition for adsorption of Pb(II) ion by the SC-Chi was achieved using mass ratio of Saccharomycess cereviceae to chitosan of 50% (w/w), pH solution of 7, contact time of 60 min and concentration of 25 mgL-1. The hydroxyl (-OH) and amino (-NH2) functional groups are believed to be responsible for the adsorption of Pb(II) ion by the adsorbent.

Research on the Effects of Roughness on the Tactile Properties of Rice Straw Particleboard Surface

2020 ◽  
Vol 12 (6) ◽  
pp. 795-801 ◽  
Author(s):  
Xian-Qing Xiong ◽  
Ying-Ying Yuan ◽  
Yi-Ting Niu ◽  
Liang-Ting Zhang
Keyword(s):  
Surface Roughness ◽  
Rice Straw ◽  
Interior Design ◽  
Roughness Parameter ◽  
Chemical Properties ◽  
Mesh Size ◽  
Design Guidelines ◽  
Before And After ◽  
The Difference ◽  
Parameter Values

To explore the effects of roughness on the tactile properties of rice straw particleboard (RSP), the surface roughness and psychological tactile and visual experiments were conducted for RSP substrates with 0.76 g/cm3 and 0.55 g/cm3 densities after sanding with sandpaper (mesh 180#, 360#, and 600#). The effects of different sandpaper types, sanding time, and density of RSP on the surface roughness were analyzed. The experimental results are as follows. The sanding treatment had significant influence on the surface roughness characterization parameters Ra and Rpv of the RSP specimens. Surface roughness differences between the 180# and 360# mesh-prepared samples were obvious. The tactile and visual psychological values of the 360# and 600# mesh-sanded specimens were higher, and the psychological quantities of untreated and 180# mesh-sanded specimens were lower. After comparing the samples with sanding treatment of sandpaper 0∼180#, the change in surface roughness of RSP with a density of 0.76 g/cm3 was smaller than that of the specimen with a density of 0.55 g/cm3. The psychological quantity difference of RSP specimens with a density of 0.55 g/cm3 was evident. When the sanding time was 1 min., the values of the roughness characterization parameters Ra and Rpv increased slightly. After 3 min. sanding, the Ra and Rpv values stabilized. When the sanding time was 5 min, the roughness was essentially unchanged. With the change in sanding time, the measured values of the tactile psychological quantity varied greatly and the measured values of the visual psychology were very close. For the RSP substrates with higher density, the surface roughness was less after sanding with a smoother surface and better tactile properties. There were significant differences between the surface roughness of the RSPs before and after sanding. After manual sanding over the same time span, the surface roughness evaluation parameter values decreased with an increase of mesh size of the sandpaper, and the tactile properties were improved. The longer the sanding time, the smaller the difference in the surface roughness parameter values, and the smaller the difference between the tactile psychological quantity and the visual psychological quantity. To expand the research scope of RSP products, this study investigates not only the physical and chemical properties but also the subjective feelings when using the RSP products. This will provide analytical methods and design guidelines for the consideration of environmental factors in furniture and interior design.

scholarly journals VARIASI WAKTU KONTAK ARANG AKTIF UNTUK MENURUNKAN BILANGAN PEROKSIDA PADA MINYAK GORENG BEKAS PAKAI

2021 ◽  
Vol 5 (1) ◽  
pp. 104-110
Author(s):  
Tuti Rustiana ◽  
Dinar Rahayu
Keyword(s):  
Particle Size ◽  
Peroxide Value ◽  
Activated Charcoal ◽  
Contact Time ◽  
Sodium Thiosulfate ◽  
Used Cooking Oil ◽  
Cooking Process ◽  
Significant Difference ◽  
Before And After ◽  
The Difference

Vegetable oil in the cooking process usually is used multiple times to fry food. This process exposes the oil to heat and oxidation. The oil itself is lipid. Lipid is a triglyceride, which means three carboxylic acids are bonded to one molecule of glycerol to form of ester. Exposing triglyceride to heat and oxidation causes it to deteriorate and break into smaller molecules such as aldehyde, ketones, and hydrocarbons. This molecule causes rancidity. Rancidity can be measured in terms of the amount of hydroperoxide presents in oil in mEq of O2/Kg. The peroxides present oxidize the iodide to iodine and the iodine is then titrated to a colorimetric endpoint using sodium thiosulfate with starch as an indicator. The amount of iodine produced is directly proportional to the peroxide value. The research has been conducted to reduce the peroxide value of used cooking oil using adsorption. The adsorbent used here is activated charcoal with a concentration of 3% and particle size of 100 Mesh. Contact time with oil is varied, ranged from 30 to 90 minutes. Statistic treatment of t-student test is performed between peroxide value before and after treatment and it is found that the difference is significant. That means active charcoal can decrease peroxide value. One way of ANOVA test among contact times (30, 60, 90 minutes) proves there is no significant difference, leading to the conclusion that activated charcoal at 3% and particle size 100 Mesh can decrease the peroxide value of oil in only 30 minutes of contact time.

scholarly journals Application of modified green algae Nannochloropsis sp. as adsorbent in the simultaneous adsorption of methylene blue and Cu(II) cations in solution

2021 ◽  
Author(s):  
Buhani ◽  
Tri Agus Wijayanti ◽  
Suharso ◽  
Sumadi ◽  
Muslim Ansori
Keyword(s):  
Heavy Metals ◽  
Methylene Blue ◽  
Green Algae ◽  
Contact Time ◽  
Organic Dyes ◽  
Liquid Waste ◽  
Silica Matrix ◽  
Particle Coating ◽  
Magnetite Particles ◽  
Simultaneous Sorption

Abstract Biomass of algae is a very potent adsorbent for absorbing liquid waste containing heavy metals and organic dyes. This study purposes to confirm the ability of adsorbents from green algae Nannochloropsis sp. modified with silica (ASN) and followed by coating magnetite particles (ASN-MPs) to absorb simultaneously the mixture of methylene blue (ME) and Cu(II) cations in aqueous solution. Simultaneous sorption of ME and Cu(II) cations to ASN and ASN-MPs was carried out by the Batch method with the interaction pH condition 7, contact time 90 minutes, and initial concentrations of ME and Cu(II) cations (0.1 - 1.0 mmol L-1). Based on adsorption data, Cu(II) cations have a greater adsorption rate and capacity (qm) compared to ME at the same contact time and initial concentration. The adsorption capacity (qm) values of the bi-component ME and Cu(II) cation mixture in ASN and ASN-MPs were 1.385 x 10-1 and 5,319 x 10-1 mmolequiv g-1, respectively, with the binary Langmuir adsorption isotherm constant for Cu(II) cations greater than ME. Modified adsorbent from algae Nannochloropsis sp. with silica matrix and magnetite particle coating, is an adsorbent that has a high effectiveness in the collective sorption of ME and Cu(II) cations. Therefore, these adsorbents can be used for the adsorption of cation mixtures of heavy metals and organic dyes that are cationic in solution.

Response Surface Methodology Approach for Optimization of Biosorption Process for Removal of Binary Metals by Immobilized Saccharomyces cerevisiae

2014 ◽  
Vol 661 ◽  
pp. 51-57
Author(s):  
Mohd Zawawi Mohamad Zulhelmi ◽  
Alrozi Rasyidah ◽  
Senusi Faraziehan ◽  
Mohamad Anuar Kamaruddin
Keyword(s):  
Saccharomyces Cerevisiae ◽  
Aqueous Solution ◽  
Response Surface Methodology ◽  
Response Surface ◽  
Contact Time ◽  
Optimization Procedure ◽  
Effective Parameters ◽  
Solution Ph ◽  
Initial Concentration ◽  
Biosorption Process

Biosorption process is considered as economical treatment to remove metal from the aqueous solution compared to other established methods. In this study, Saccharomyces cerevisiae was used as biosorbent and subject to immobilization process which consists of ethanol treatment for the removal of binary metals, lead (II) and nickel (II) from aqueous solution. Response surface methodology (RSM) was used to optimize effective parameters condition and the interaction of two or more parameters in order to obtain high removal of the binary metals. The parameters that have been studied were initial concentration of binary metals solution (10 - 60 mg/L), biosorbent dosage (0.2 - 1.0 g), pH (pH 2 - pH 6) and contact time (30 - 360 minutes) towards lead (II) and nickel (II) ions removal. Based on analysis of variance (ANOVA), biosorbent dosage, solution pH and contact time factor were found significant for both responses. Through optimization procedure, the optimum condition for lead (II) and nickel (II) ions removal were obtained at initial concentration of 10.0 mg/L, biosorbent dosage of 1.0 g, solution pH of pH 6, and contact time of 360.00 minutes, which resulted in 95.08 % and 21.09 % removal of lead (II) and nickel (II) ions respectively.

scholarly journals Equilibrium, Kinetics, and Thermodynamics of the Biosorption of Zn(II) from Aqueous Solution Using Powdered Cow Hooves

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Ilesanmi Osasona ◽  
Olubode O. Ajayi ◽  
Albert O. Adebayo
Keyword(s):  
Aqueous Solution ◽  
Contact Time ◽  
Kinetic Equations ◽  
Mesh Size ◽  
Isotherm Models ◽  
Order Kinetic ◽  
Solution Ph ◽  
Equilibrium Studies ◽  
Biosorption Process ◽  
Increase With Increase

The capability of cow hoof (CH) to remove Zn(II) from aqueous solution under the influence of sorbent size, solution pH, contact time, and sorbent dosage was investigated through batch studies. Equilibrium studies were conducted at three different temperatures (298, 308, and 318 K) by contacting different concentrations of Zn(II) solution with a known weight of cow hoof. The biosorption of Zn onto cow hoof was found to increase with increase in the mass of sorbent used while the biosorption efficiency was found to decrease with increase in sorbent particle size. The optimum conditions of pH 4 and contact time of 60 minutes were required for maximum removal of Zn(II) by cow hoof (mesh size 212 µm). The equilibrium data were modelled using Langmuir, Freundlich, and Dubinin-Radushkevich (D-R) isotherm models. The data were best fitted by Langmuir model. The kinetic data were analysed using Lagergren kinetic equations and these were well fitted by the pseudo-second-order kinetic model. The thermodynamic parameters showed that the biosorption process was feasible, spontaneous, and endothermic.

scholarly journals INVESTIGATION OF THE INFLUENCE OF PARTICLE SIZE OF RICE HUSK ASH AS ADSORBENT FOR MERCURY IN COLUMN ADSORPTION SYSTEM

Konversi ◽  
2021 ◽  
Vol 10 (2) ◽  
Author(s):  
Desi Nurandini ◽  
Riani Ayu Lestari ◽  
Isna Syauqiah ◽  
Ahmad Rizalli ◽  
Ryan Rahmatullah
Keyword(s):  
Heavy Metals ◽  
Particle Size ◽  
Rice Husk ◽  
Adsorption Process ◽  
Rice Husk Ash ◽  
Liquid Waste ◽  
Silica Content ◽  
Column Adsorption ◽  
Before And After ◽  
Adsorbent Particle

The presence of heavy metal mercury (Hg2+) in liquid waste has caused serious problems to environmental pollution. One of the most effective method to reduce the levels of heavy metals mercury (Hg2+) in liquid waste is adsorption. Rice husk ash is highly potential to adsorb heavy metals in water because it is a porous material with a high silica content. Therefore, rice husk ash can be used as an adsorbent for heavy metals in liquid waste. The purpose of this study was to determine the level of mercury (Hg2+) that can be adsorbed from the column adsorption process using adsorbent of rice husk ash and to determine the optimum mass of rice husk ash as an adsorbent. The research was conducted using a series of simple adsorption column tools with a circulation time of 120 minutes. While the independent variables were adsorbent particle size of 50, 100, and 200 mesh. Measurement of mercury (Hg2+) levels was carried out on samples before and after treatment with Atomic Absorption Spectrophotometer (AAS). The results showed a significant decrease in Hg2+ levels with the optimum adsorbent particle size of 200 mesh. The value of the adsorbed Hg2+ ion content reached 101.670 mg/L in the adsorption process using adsorbent with 200 mesh particle size . 

Zinc Removal Using Honey Dew Rind

2014 ◽  
Vol 680 ◽  
pp. 150-153 ◽  
Author(s):  
N. Othman ◽  
A.S. Che-Azhar ◽  
A. Suhaimi
Keyword(s):  
Heavy Metals ◽  
Adverse Effect ◽  
Industrial Waste ◽  
Contact Time ◽  
Human Life ◽  
Biosorption Process ◽  
Zinc Removal ◽  
Metals Removal ◽  
Optimization Study ◽  
Heavy Metals Pollution

Heavy metals pollution in wastewater from agriculture and industrial waste has been a great concern due to their toxic condition and adverse effect to the environment and human life. One of the treatment of heavy metals through biosorption. In this study, zinc is the highest concentration heavy metal in mosaics wastewater with 350 - 450 mg/L and thus, it has been selected for further study for heavy metals removal. Honeydew rind was used as biosorbent material to remove zinc in the wastewater. Characterization and optimization study were carried out. The optimum condition for pH, biosorbent amount, concentration of wastewater and contact time are at pH 6, 1.5g adsorbent, 400 mg/L zinc and 30 minutes contact time respectively 63% zic removal. This finding indicates that honeydew rind is effectively acted as biosorbent in biosorption process for removing zinc from wastewater.

scholarly journals PEMANFAATAN LIMBAH CANGKANG TELUR SEBAGAI BIOSORBEN UNTUK ADSORPSI LOGAM Pb Dan Cd

2017 ◽  
Vol 5 (1) ◽  
pp. 92
Author(s):  
Mamay Maslahat ◽  
Agus Taufik ◽  
Prima Wahyu Subagja
Keyword(s):  
Heavy Metals ◽  
Atomic Absorption ◽  
Contact Time ◽  
Waste Utilization ◽  
Atomic Absorption Spectrophotometer ◽  
Shell Waste ◽  
Before And After ◽  
Egg Shell ◽  
Eggshell Waste ◽  
Heavy Metal Waste

Waste Utilization of Eggs Shell as an Adsorbent for Adsorption of Metal, Pb and Cd        Egg shell waste is one of waste that not be fully utilized. Eggshell can be used as a biosorbent substance because its contain a high CaCO3 and has a natural pore structure. Eggshell waste biosorbent potentially used as an alternative to adsorp heavy metal waste that pollute much in the environment. The purpose of the study was to use the waste to become biosorbent and to investigate its potential in adsorption Pb and Cd. Research methodology were producing biosorbent and getting optimum-sorption condition. They were contact time, biosorbent weights, and the concentration of  Pb and Cd. Measurement of the concentration of Pb and Cd before and after sorption processes using instrument of Atomic Absorption Spectrophotometer (AAS) Agilent 240FS type AA. The results showed that eggshell biosorbent could adsorb heavy metals of Pb 65.99% in concentration of adsorbent of 160 ppm, contact time was 20 minutes, and biosorbent weights of 0.50 g. Adsorption of Cd was 93.16% in concentration of adsorbent was 20 ppm, contact  time  40 minutes, and biosorbent weights 0.25 g.Key words: eggshell biosorbent ,  Pb, Cd, Atomic Absorbtion Spectrophotometer ABSTRAK         Limbah cangkang telur termasuk salah satu limbah yang belum dimanfaatkan secara maksimal. Cangkang telur dapat dimanfaatkan sebagai zat penjerap yang baik karena mengandung CaCO3 yang tinggi dan memiliki struktur pori-pori alami. Limbah cangkang telur berpotensi digunakan sebagai biosorben alternatif untuk mengadsorpsi limbah logam berat yang banyak mencemari lingkungan yaitu logam berat Pb dan Cd. Tujuan penelitian ini adalah memanfaatkan limbah cangkang telur untuk dijadikan biosorben dan meneliti potensinya dalam adsorpsi logam Pb dan Cd. Tahapan penelitian terdiri atas preparasi dan pembuatan biosorben cangkang telur, dan  optimasi adsorpsi biosorben cangkang telur terhadap logam berat Pb dan Cd. Optimasi adsorpsi meliputi variabel waktu kontak optimum, bobot biosorben optimum,  dan konsentrasi adsorbat optimum. Pengukuran konsentrasi logam berat Pb dan Cd sebelum dan setelah proses adsorpsi menggunakan instrumen Atomic Absorption Spectrophotometer (AAS) Agilent tipe 240FS AA. Hasil penelitian menunjukan bahwa biosorben cangkang telur dapat mengadsorpsi logam berat Pb sebesar 65,99% pada kondisi konsentrasi adsorbat 160 ppm, waktu kontak 20 menit, dan berat biosorban sebesar 0,50 gram. Sedangkan untuk logam berat  Cd, persen adsorpsi sebesar 93,16% pada konsentrasi sorbat 20 ppm, waktu kontak 40 menit, dan berat biosorben sebesar 0,25 gram.Kata Kunci: biosorben cangkang telur, Pb, Cd, Atomic Absorption spectrophotometer.

scholarly journals Removal of lead, mercury and nickel using the yeast Saccharomyces cerevisiae

2014 ◽  
pp. 4141-4149 ◽  
Author(s):  
Cherlys Infante J
Keyword(s):  
Heavy Metals ◽  
Saccharomyces Cerevisiae ◽  
Interaction Effects ◽  
Yeast Saccharomyces Cerevisiae ◽  
Biosorption Process ◽  
A Value ◽  
Individual Variables

ABSTRACTObjective. In this study the biomass of the yeast Saccharomyces cerevisiae was used to remove lead, mercury and nickel in the form of ions dissolved in water. Materials and methods. Synthetic solutions were prepared containing the three heavy metals, which were put in contact with viable microorganisms at different conditions of pH, temperature, aeration and agitation. Results. Both individual variables and the interaction effects influenced the biosorption process. Throughout the experimental framework it was observed that the biomass of Saccharomyces cerevisiae removed a higher percentage of lead (86.4%) as compared to mercury and nickel (69.7 and 47.8% respectively). When the pH was set at a value of 5 the effect was positive for all three metals. Conclusions. pH was the variable that had a greater influence on the biosorption of lead on the biomass of Saccharomyces cerevisiae. The affinity of the heavy metals for the biomass followed the order Pb>Hg>Ni.

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