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.

scholarly journals Heavy Metal Removal from Aqueous Solution Using Biosurfactants Produced by Pseudomonas aeruginosa with Corn Oil as Substrate

2018 ◽  
Vol 18 (3) ◽  
pp. 472
Author(s):  
Venty Suryanti ◽  
Sri Hastuti ◽  
Tutik Dwi Wahyuningsih ◽  
Mudasir Mudasir ◽  
Dian Kresnadipayana ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Heavy Metal ◽  
Metal Ions ◽  
Contact Time ◽  
Metal Ion ◽  
Metal Removal ◽  
Corn Oil ◽  
Metal Ion Removal ◽  
Ion Removal ◽  
Removal Capacity

The batch removal of Cu(II), Cd(II) and Pb(II) from individual heavy metal ion aqueous synthetic solution using biosurfactants produced by Pseudomonas aeruginosa with corn oil as substrate was investigated. The metal ion removal process of crude preparation biosurfactants (CPB) was established to be dependent on the initial pH and contact time. The optimum metal removal was observed at pH 6.0 of the initial metal solution and 10 min of contact time. The affinity sequence for metal ion removal was Pb(II)>Cd(II)>Cu(II). The removal capacity value of biosurfactant for Cu(II), Cd(II) and Pb(II) from single metal ions solution were 0.169, 0.276 and 0.323 mg/g, respectively. The removal capacity value of biosurfactant for Cu(II), Cd(II) and Pb(II) from multi metal ions solution were 0.064, 0.215 and 0.275 mg/g, respectively. The removal capacity of individual metal ion was diminished by the presence of other metal ions in multi metal ions from synthetic aqueous solution. The removal capacity value of biosurfactant for Cu(II), Cd(II) and Pb(II) from silver industry wastewater were 0.027, 0.055 and 0.291 mg/g, respectively. The results indicated that biosurfactants have potential to be used in the remediation of heavy metals in industrial wastewater.

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 PENYERAPAN ION LOGAM Pb(II) DARI LARUTAN MENGGUNAKAN SERBUK DAUN PURING (Codiaeum variegatum)

2017 ◽  
Vol 8 (1) ◽  
pp. 34
Author(s):  
Fitriani Fitriani
Keyword(s):  
Hydrochloric Acid ◽  
Optimum Condition ◽  
Atomic Absorption ◽  
Metal Ion ◽  
Chemical Activation ◽  
Powder Metal ◽  
Chemical Methods ◽  
Codiaeum Variegatum ◽  
Leaf Powder ◽  
The Difference

The adsorption of metal ion Pb(II) by croton leaf powder through the activation of hydrochloric acid (HCl) or chemical methods has been researched. The research aimed to determine the optimum condition of croton leaf powder as adsorbent by variation of contacting time (30, 60, 90 and 120 minutes) and the difference in mass of adsorbent (1; 2; 3 and 4 grams ). This research began with downsizing the size of croton leafs become to 100 mesh, then was performed chemical activation by soaking the croton leaf powder with 2 N HCl. The adsorption was conducted by contacting the adsorbent with a solution of the sample based on contacting time and mass of adsorbent, then analyzed by Atomic Absorption Spectrophotometer (AAS). The result showed that the optimum condition of adsorption was achieved at 4 grams adsorbent by contacting time in the 60 minutes with Pb(II) adsorbed 1,76 mg/L or 35,2 %. Based on this findings, we concluded that the increase in mass of adsorbent increased the adsorption power of metal ion Pb(II) by optimum contacting time. Keywords: adsorption, croton leaf powder, metal ion Pb(II)

Bentonite-Biochar Combination for Manganese Ion Removal from Water

2021 ◽  
Vol 1162 ◽  
pp. 81-86
Author(s):  
Yasdi Yasdi ◽  
Rinaldi Rinaldi ◽  
Wahyu Fajar Winata ◽  
Febri Juita Anggraini ◽  
Ika Yanti ◽  
...  
Keyword(s):  
Contact Time ◽  
Metal Ion ◽  
Room Temperature ◽  
Adsorption Process ◽  
Quality Standard ◽  
Ion Concentration ◽  
Optimum Conditions ◽  
Manganese Ion ◽  
Ion Removal ◽  
Optimum Ph

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 = 100 mL). The best combination obtained in Bentonite: Biochar (1:2) with a mass of 0.080 gr and 0.170 gr, respectively, which able to remove 91.29% manganese ions in peat water.

scholarly journals The Ability of Edible Fungi Residue to Remove Lead in Wastewater

2021 ◽  
Vol 9 ◽  
Author(s):  
Yanyan Jing ◽  
Zongyu Li ◽  
Yameng Li ◽  
Gao Lei ◽  
Liangliang Li ◽  
...  
Keyword(s):  
Functional Groups ◽  
Metal Ion ◽  
Adsorption Process ◽  
Agricultural Waste ◽  
Common Source ◽  
Edible Fungi ◽  
Solution Ph ◽  
Adsorption Sites ◽  
Before And After ◽  
Factor Design

Lead (Pb)-contaminated wastewater is the most common source of heavy metal ion pollution. In this study, agricultural waste edible fungi residue (EFR) was used to adsorb Pb(II) ions in wastewater as a strategy to reduce environmental pollution and minimize poisoning by Pb. The influence of Pb(II) concentration, solution pH, and EFR concentration on the removal efficiency (R) of Pb(II) was investigated with single factor design and response surface analysis. The maximum predicted R for Pb(II) was 76.34% under optimal conditions of Pb(II) concentration of 483.83 mg/L, EFR concentration of 4.99 g/L, and pH of 5.89. The actual experimental value of R reached 76.97% under these conditions. The competition of Pb(II) ions for the available adsorption sites on EFR limited the maximum R. A comparison of Fourier transform infrared spectroscopy before and after the adsorption of Pb(II), indicated that the functional groups of EFR significantly affected the effect of adsorption of heavy metals, and that the adsorption process was primarily affected by functional groups in the range of wavenumbers from 500 to 2,000 cm−1.

Numerical Solution of Elas-Plastic Impact Load of Tube Column

2008 ◽  
Vol 33-37 ◽  
pp. 363-368
Author(s):  
Chun Yang Liu ◽  
Bing Xin Li ◽  
Jin San Ju ◽  
Xiu Gen Jiang ◽  
Xiao Chuan You
Keyword(s):  
Rigid Body ◽  
Contact Time ◽  
Impact Load ◽  
Local Buckling ◽  
Tube Model ◽  
Mass Ratio ◽  
The Difference ◽  
Reduction Effect ◽  
The Impact ◽  
Peak Value

The explicit numerical method is used to trace the impact procedure of the tube columns impacted by a rigid body. The bar and rectangle tube models are both used to simulate the tube column. The elastic and elas-plastic impact load with different mass ratio and impact speed are obtained. The calculation results show that: for elastic models, the bigger the mass ratio and the higher the rigid body speed, the bigger the peak value of elastic impact load; at the same time, the more obvious the reduction effect of local buckling of rectangle tube on the peak value of impact load and the longer the contact time of tube model; so the peak value of impact load of the rectangle tube is not proportional to the rigid body speed. The stress wave in the tube causes a little difference between the load curves of tube model and bar model. For elas-plastic models, the higher the rigid body speed and the smaller the mass ratio, the bigger the peak value of impact load and the longer the contact time. The higher the rigid body speed, the bigger the difference between elastic and elas-plastic impact load peak value due to the expanding of plasticity. Because of the effect of local buckling, the peak value of elas-plastic impact load of rectangle tube is always lower than that of bar.

scholarly journals The Kinetics of Ampicillin Release from Hydroxyapatite for Bones Regeneration

2009 ◽  
Vol 2009 ◽  
pp. 1-5
Author(s):  
Giovanilton Ferreira da Silva ◽  
José Sílvio Veras Albuquerque ◽  
Caroliny Gomes de Oliveira ◽  
Ricardo Emilio Ferreira Quevedo Nogueira ◽  
Andrea Lopes de Oliveira Ferreira
Keyword(s):  
Human Medicine ◽  
Beta Lactam ◽  
Adsorption Experiment ◽  
Beta Lactam Antibiotics ◽  
High Release ◽  
Before And After ◽  
Dose Control ◽  
Low Toxicity ◽  
The Difference ◽  
Kinetics Of

Semisynthetic beta-lactam antibiotics are among the most used pharmaceuticals. Their use in veterinary and human medicine is in continuous expansion. There is a growing need for developing bioactive implants. Advantages of implantable drug delivery tools can include high release efficiency, precise dose control, low toxicity, and allow to overcome disadvantages connected with conventional methods. In this respect, hydroxyapatite (HA) is an elective material. It enables to produce architectures similar to those of real bones. Here we studied a kinetic model to describe ampicillin release from HA. In the course of adsorption experiment, ampicillin was dissolved, maintained at and shaken at 60 strokes/minute. Samples were withdrawn periodically for analysis and then returned to the mixture. Adsorbed amounts were measured by the difference of the concentration of the antibiotics before and after adsorption using UV adsorption at 225 nm. The aim of this work was to evaluate its application as ampicillin delivery carrier.

scholarly journals THERMODYNAMIC OF Mg(II), Cd(II), AND Ni(II) ADSORPTION ON SULFONIC MODIFIED SILICA GEL

2010 ◽  
Vol 5 (1) ◽  
pp. 31-35 ◽  
Author(s):  
Choiril Azmiyawati ◽  
Nuryono Nuryono ◽  
Narsito Narsito
Keyword(s):  
Silica Gel ◽  
Metal Ion ◽  
Ion Concentration ◽  
Chemical Adsorption ◽  
Modified Silica ◽  
Adsorption Parameters ◽  
Modified Silica Gel ◽  
Batch System ◽  
Before And After ◽  
The Difference

Silica gel modified with 4-amino-5-hydroxy-2,7-naphtalenedisulphonate (SG-SO3-) has been applied for adsorption of Mg(II), Cd(II), and Ni(II) in aqueous medium. In addition, three thermodynamic parameters i.e. capacity, adsorption constant and energy of adsorption were calculated. Adsorption was conducted in a batch system and metal ion remaining in the solution was determined by atomic adsorption spectrophotometry (AAS). The amount of adsorbed metal ions was calculated from the difference of metal ion concentration before and after interaction. Adsorption parameters i.e. capacity (ns2), constant (b), and energy (E) of adsorption were calculated using the equation of Langmuir isotherm. Results showed that ns2 for Mg(II), Cd(II), and Ni(II) on the adsorbent were 4.67 x 10-4, 1.19 x 10-4, and 0.13 x 10-4mol g-1, respectively. The values of b for Mg(II), Cd(II), and Ni(II) were 49.35 x 105, 173.46 x 105, and 181.12 x 105 g-1, respectively. Furthermore, it was found that E for all metal ion investigated was in the range of 26-30 kJ/mol, indicating the involvement of chemical adsorption.  

scholarly journals Biosorpsi Ion Logam Kadmium (Cd2+) Pada Biosorben Rumput Laut Coklat (Padina australis) Asal Pantai Liti Pulau Kisar

2018 ◽  
Vol 6 (1) ◽  
pp. 51-58
Author(s):  
Catherina M. Bijang ◽  
Helna Tehubijuluw ◽  
Terence Ghereds Kaihatu
Keyword(s):  
Atomic Absorption ◽  
Functional Groups ◽  
Contact Time ◽  
Metal Ion ◽  
Adsorption Process ◽  
Brown Seaweed ◽  
Atomic Absorption Spectrophotometer ◽  
Optimum Ph

The research about biosorption of Cadmium (Cd2+) metal ion in brown seaweed biosorben (Paladina australis) from Liti beach, Kisar island has been done. Analysis of decreasing Cd2+ content using Atomic Absorption Spectrophotometer (SSA) and also use FTIR to know functional groups contained in alginate compounds. A total of 0.5 g of brown seaweed powder was introduced into 25 mL of Cd2+ 50 ppm solution with variations of pH 1-7 and shaker for five hours. After the  optimum  pH  was  obtained,  the  adsorption  process  was  applied  on  pH  5 solution with variation of contact time 1, 3, and 5 hours, after which it was filtered. The result of analysis and calculation showed that Cd2+ ion was optimum at pH 5 of 99.64% and 3 hours contact time was 74.54%.

scholarly journals EFEKTIFITAS TUMBUHAN ENCENG GONDOK (EICHORMONIA CRASSIPES) SEBAGAI FITOREMEDIASI DALAM MENURUNKAN KADAR BESI (Fe), TIMAH HITAM (Pb), MANGAN (Mn) PADA LEACHATE TPA

2018 ◽  
Vol 6 (2) ◽  
pp. 193-200
Author(s):  
Septiana Suryanti
Keyword(s):  
Experimental Design ◽  
Water Hyacinth ◽  
Contact Time ◽  
Test Design ◽  
Research Results ◽  
A Value ◽  
Before And After ◽  
Post Test ◽  
The Difference ◽  
One Way Anova

This study aims at knowing the difference in decreased levels of iron (Fe), lead (Pb), and manganese (Mn) in leachate before and after treatment. Research used a true experimental design with pre-post test design. The amount of leachate that is used in each treatment is 10 liters of leachate and 1 kg of water hyacinth, and do in 3 times repetition. Analysis of the was tested using One Way ANOVA test followed by LSD (Least Significance Difference). The results showed that there were significant differences in the use of water hyacinth in the leachate decreased levels of iron (Fe), lead (Pb), and manganese (Mn) with a value of ρ = 0.000. Research results before treatment (pre-test) levels Fe = 6.30 mg / l, after treatment (post-test) Fe = 0.25 mg / l, before treatment (pre-test) value Pb = 2.90 mg / l, after treatment (post-test) and Pb = 0.33 before treatment (pre-test) the value of Mn = 2.68 mg / l, after treatment (post-test) Mn = 0.08 mg / l. It is known that the ability of water hyacinth weighing 1 kg with a time of 6 days is more effective than water hyacinth 2 days and 4 days in the lower levels of iron (Fe), lead (Pb) and manganese (Mn) in the leachate. It can be concluded that water hyacinth could reduce levels of iron (Fe), lead (Pb) and manganese (Mn) in the leachate with contact time 6 days.

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