scholarly journals BIOSORPTION OF METAL IONS Pb(II), Cu(II), AND Cd(II) ON Sargassum duplicatum IMMOBILIZED SILICA GEL MATRIX

2010 ◽  
Vol 6 (3) ◽  
pp. 245-250 ◽  
Author(s):  
Buhani Buhani ◽  
Suharso Suharso ◽  
Zipora Sembiring
Keyword(s):  
Metal Ions ◽  
Silica Gel ◽  
Functional Group ◽  
Adsorption Process ◽  
Liquid Waste ◽  
Batch Method ◽  
Algae Biomass ◽  
Adsorbent Surface ◽  
Physical And Chemical ◽  
Matrix Series

Sargassum duplicatum algae biomass is biological material which has a potency to be used as a biosorbent adsorb metal ions from industrial liquid waste, because it has effective functional group as a ligand. However, the ability of the algae biomass in adsorbing of heavy metal ions has some problem such as; tiny size, low density, and easy to be degradated by other microorganism. In addition, algae biomass can not be used directly in adsorption column for its application as the biosorbent. In order to improve physical and chemical prpperties of algae biomass, it needs to be immobilized on silica gel matrix. Series of experiment have been done, morphology analysis of adsorbent surface was performed by using Scanning Electron Microscopy (SEM) and adsorption process to examine the effectiveness of algae biomass immobilized in adsorbing Pb(II), Cu(II), and Cd(II) was performed using batch method at 27 °C. Concentration of metal was determined by using Atomic Absorption Spectrophotometer (AAS) and identification of functional group was conducted using Spectrophotometer Infrared (IR). Data obtained showed that interacting among metal ions with algae biomass is optimum at a range of 60 minutes. Adsorption energies of metal ions resulted from the interaction of metal ions with the functional group of -C=O group from carboxyl and amide on algae biomass and -Si-OH group from silica were at a range of 21.09-25.05 kJ/mole.   Keywords: biosorption, silica gel, Sargassum duplicatum, immobilization

scholarly journals STUDY ON THE ADSORPTION PROPERTIES OF NOVEL CALIX[6]ARENE POLYMERS FOR HEAVY METAL CATIONS

2012 ◽  
Vol 12 (1) ◽  
pp. 28-34 ◽  
Author(s):  
Susy Yunita Prabawati ◽  
Jumina Jumina ◽  
Sri Juari Santosa ◽  
Mustofa Mustofa ◽  
Keisuke Ohto
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Adsorption Kinetics ◽  
Contact Time ◽  
Adsorption Process ◽  
Metal Cations ◽  
Kinetics Model ◽  
Batch Method ◽  
Heavy Metal Cations ◽  
Kinetics Of

A research has been conducted to investigate the capability of a series of novel calix[6]arenes-based polymers: poly-monoallyloxycalix[6]arene (2a), poly-monoallyloxypenta-estercalix[6]arene (2b) and poly-monoallyloxypenta-acidcalix[6]arene (2c) for trapping of heavy metal cations such as Cd(II), Cu(II) and Cr(III). The existence of active hydroxy group (-OH) and with a tunnel-like structure of the polymers, caused the polymers can be used as adsorbents for heavy metals. The adsorption process was carried out in batch method in the variation of acidity (pH), contact time and initial concentration of metal ions. The results showed that the amount of adsorbed metal increased with the increasing of the pH of metal solution. For these three polymers, the amount of metal ions Cd(II), Cu(II) and Cr(III) adsorbed was optimum at pH 7, 6 and 5 respectively. The optimum contact time for Cd(II) and Cu(II) was 120 min, while that for Cr(III) was 60 min. Study of the adsorption kinetics showed that the adsorption of Cd(II), Cu(II) and Cr(III) using polymer 2a followed kinetics model of Ho. For adsorbent 2b and 2c, the adsorption kinetics of Cd(II) and Cr(III) also followed kinetics model of Ho while for the Cu(II) followed Lagergren kinetic models. Isothermal studies showed that the adsorption of metal ions on all adsorbents tend to follow the Langmuir isotherm. The adsorption energies of the three adsorbents were higher than 23 kJ/mole and polymer 2c has the largest adsorption capacity for Cr(III).

scholarly journals Adsorpsi Logam Ni dan Cu pada Limbah Cair Laboratorium Kimia menggunakan Biosorben Batang Jagung Termodifikasi Asam Sitrat

ALCHEMY ◽  
2019 ◽  
Vol 7 (1) ◽  
pp. 13
Author(s):  
Eny Yulianti ◽  
RIf'atul Mahmudah ◽  
Ainul Ma'rifah ◽  
Ulal Azmiyani
Keyword(s):  
Citric Acid ◽  
Metal Ions ◽  
Functional Group ◽  
Liquid Waste ◽  
Hydroxyl Groups ◽  
Corn Stalk ◽  
Adsorption Ability ◽  
Chemical Laboratory ◽  
Lactone Group ◽  
Carboxylic Groups

<p class="BodyAbstract">Corn stalk contains 40-50% cellulose, 20-40% hemicellulose, 4-15% lignin which had potential as biosorbent in binding metal ions. In this study, demineralization and modification by adding citric acid (1.5 M and 2 M) of corn stalk were conducted to convert hydroxyl groups into carboxylic. Then, it was analyzed its functional groups using Boehm titration and FTIR. The modified corn stalk was applied directly to chemical laboratory liquid waste which contains multicomponent of heavy metal ions. By modifying the corn stalk, the number of hydroxyl and carboxylic groups increased, but the number of lactone group was constant. The success of the modification was characterized by the appearance of ester uptake at 1734 cm<sup>-1</sup> and increased adsorption ability. The variations in the concentration of citric acid in modification corn stalk showed that biosorbent with addition 1.5 M citric acid had higher in the number of acid site than addition 2 M citric acid to absorb Ni and Cu.</p><p> <br /> Keywords: Corn stalk, citric acid, biosorbent, functional group</p><p class="BodyAbstract"><strong> </strong></p><p class="BodyAbstract"><strong> </strong></p><p>Batang jagung mengandung sekitar 40-50% selulosa, 20-40% hemiselulosa, 4-15% lignin yang berpotensi sebagai biosorben pengikat ion logam. Pada penelitian ini dilakukan demineralisasi dan modifikasi dengan penambahan asam sitrat (1,5 M dan 2 M) untuk mengubah gugus hidroksil pada selulosa membentuk karboksilat. Selanjutnya, dianalisis gugus fungsinya menggunakan titrasi Boehm dan FTIR. Hasil modifikasi diaplikasikan langsung pada limbah cair laboratorium kimia yang mengandung banyak jenis ion logam berat. Biosorben batang jagung setelah dimodifikasi mengalami peningkatan jumlah gugus fungsi hidroksil dan karboksilat, tetapi gugus lakton tetap. Keberhasilan modifikasi ditandai dengan munculnya serapan ester pada 1734 cm<sup>-1 </sup>dan peningkatan kemampuan adsorpsi. Dari hasil variasi konsentrasi asam sitrat diperoleh informasi bahwa biosorben dengan penambahan asam sitrat 1,5 M mempunyai situs asam lebih tinggi dan mempunyai kemampuan adsorpsi terhadap ion logam Ni dan Cu lebih besar dibanding penambahan asam sitrat 2 M.</p><p><span style="text-decoration: line-through;"> </span></p><p>Kata kunci:  Batang jagung, asam sitrat, biosorben, gugus fungsi</p>

scholarly journals New thiamine functionalized silica microparticules as a sorbent for the removal of lead, mercury and cadmium ions in aqueous media

2017 ◽  
Vol 82 (2) ◽  
pp. 215-226 ◽  
Author(s):  
Sabahattin Deniz ◽  
Neşe Taşci ◽  
Ece Yetimoğlu ◽  
Memet Kahraman
Keyword(s):  
Metal Ions ◽  
Silica Gel ◽  
Adsorption Process ◽  
Binding Capacity ◽  
Aqueous Media ◽  
Vitamin B1 ◽  
Isotherm Models ◽  
Potential Candidate ◽  
Functionalized Silica ◽  
Feed Concentration

The existence of heavy metal ions in aqueous media is one of the biggest environmental pollution problems and thus the removal of heavy metals is a very important procedure. In this work, a new adsorbent was synthesized by modifying 3-aminopropyl-functionalized silica gel with thiamine (vitamin B1) and characterized. The influence of the uptake conditions, such as pH, contact time, initial feed concentration and foreign metal ions, on the binding capacity of thiamine-functionalized silica gel sorbent (M3APS) were investigated. Maximum obtained adsorption capacities for Pb(II), Hg(II) and Cd(II) were 39.4?0.2, 30.9?0.5 and 9.54?0.4 mg g-1 M3APS, respectively, at pH 5.0. The observed selectivity of M3APS for these metal ions was the following: Pb(II) > Hg(II) > Cd(II). Adsorption isotherm models were also applied to the adsorption process. As a result, the Langmuir isotherm model gave the best fit for the adsorption of metal ions on M3APS. The Gibbs energy change (?G) for the adsorption of Pb(II), Hg(II) and Cd(II) were calculated to predict the nature of adsorption process. Having such satisfactory adsorption results, M3APS is a potential candidate adsorbent for Pb(II) and Hg(II) removal from aqueous media.

scholarly journals The Utilization of Poly-37,40-diallyl-38,39,41,42,-tetrahydroxycalix[6]arenes Compound as Adsorbent for Heavy Metal Cations Cd(II), Cr(III) and Cu(II)

2020 ◽  
Vol 5 (2) ◽  
pp. 94
Author(s):  
Susy Yunita Prabawati ◽  
Jumina Jumina ◽  
Sri Juari Santosa ◽  
Mustofa Mustofa
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Adsorption Kinetics ◽  
Contact Time ◽  
Metal Ion ◽  
Adsorption Process ◽  
Metal Cations ◽  
Batch Method ◽  
Heavy Metal Cations ◽  
Adsorption Capacities

This research aims to examine the capability of poly-37,40-diallyl-38,39,41,42,-tetrahydroxy-calix[6]arenes as adsorbent for heavy metal cations such as Cd(II), Cr(III) and Cu(II). The adsorption process was carried out by batch method in the variation of acidity (pH), contact time and initial concentration of metal ions. The adsorption kinetics and adsorption isotherms were also studied. The results of this research showed that the amount of adsorbed metal increased with the increasing of the pH of metal solution. The amount of metal ions Cd(II) and Cr(III) adsorbed was optimum at pH 5, while for metal ion Cu(II) was optimum at pH 4. The optimum contact time for Cd(II), Cr(III) and Cu(II) was 60; 30; and 180 minutes, respectively. The study of adsorption kinetics showed that the adsorption of Cd (II), Cr (III) and Cu (II) metal ions using this adsorbent followed kinetics model of Ho. Isothermal studies showed that the adsorption of the three metal ions tends to follow the Langmuir isotherm. The adsorption capacities of Cd (II), Cr (III) and Cu (II) metal ions with poly-37,40-diallyl-38,39,41,42,-tetrahydroxycalix[6]arenes were 7.06; 14.72 and 38.45 µmol/g, respectively.  

scholarly journals THE ISOTHERMIC ADSORPTION OF Pb(II), Cu(II) AND Cd(II) IONS ON Nannochloropsis sp ENCAPSULATED BY SILICA AQUAGEL

2010 ◽  
Vol 9 (1) ◽  
pp. 1-4
Author(s):  
Zipora Sembiring ◽  
Buhani Buhani ◽  
Suharso Suharso ◽  
Sumadi Sumadi
Keyword(s):  
Metal Ions ◽  
Adsorption Energy ◽  
Contact Time ◽  
Adsorption Process ◽  
Chemical Interaction ◽  
Absorption Spectrometry ◽  
Batch Method ◽  
Adsorption Capacities ◽  
Metal Contents ◽  
Series Of Experiments

The research on the adsorption process of metal ions of Pb(II), Cu(II) and Cd(II) on Nannochloropsis sp biomass encapsulated by silica aquagel has successfully been done. The research was carried out in a series of experiments using batch method to obtain the capacity and adsorption energy values of the metal ions. The analysis of metal contents was done by atomic absorption spectrometry. The results showed that the adsorption capacities of Pb(II), Cu(II) and Cd(II) ions were 322.58; 0.033 and 0.0322 mmole/g adsorbent, respectively, at 27 °C and contact time of 30 min. The interaction between Pb(II), Cu(II) and Cd(II) ions and Nannochloropsis sp biomass encapsulated by silica aquagel is chemical interaction with the adsorption energy in the range of 20.55 - 22.70 kJ/mole.   Keywords: adsorption, Nannochlorosis sp, encapsulated, silica aquagel

Chitosan-based Magnetic Composites - Efficient Adsorbents for Removal of Pb(II) and Cu(II) from Aqueous Mono and Bicomponent Solutions

2018 ◽  
Vol 69 (9) ◽  
pp. 2323-2330 ◽  
Author(s):  
Daniela C. Culita ◽  
Claudia Maria Simonescu ◽  
Rodica Elena Patescu ◽  
Nicolae Stanica
Keyword(s):  
Aqueous Solutions ◽  
Metal Ions ◽  
Chemical Properties ◽  
Order Kinetic ◽  
Mass Ratio ◽  
Magnetic Adsorbent ◽  
Magnetic Composites ◽  
Initial Ph ◽  
Order Kinetic Model ◽  
Physical And Chemical

A series of three chitosan-based magnetic composites was prepared through a simple coprecipitation method. It was investigated the influence of mass ratio between chitosan and magnetite on the physical and chemical properties of the composites in order to establish the optimum conditions for obtaining a composite with good adsorption capacity for Pb(II) and Cu(II) from mono and bicomponent aqueous solutions. It was found that the microspheres prepared using mass ratio chitosan / magnetite 1.25/1, having a saturation magnetization of 15 emu g--1, are the best to be used as adsorbent for the metal ions. The influence of different parameters such as initial pH values, contact time, initial concentration of metal ions, on the adsorption of Pb(II) and Cu(II) onto the chitosan-based magnetic adsorbent was investigated in details. The adsorption process fits the pseudo-second-order kinetic model in both mono and bicomponent systems, and the maximum adsorption capacities calculated on the basis of the Langmuir model were 79.4 mg g--1 for Pb(II) and 48.5 mg g--1 for Cu(II) in monocomponent systems, while in bicomponent systems were 88.3 and 49.5 mg g--1, respectively. The results revealed that the as prepared chitosan-based magnetic adsorbent can be an effective and promising adsorbent for Pb(II) and Cu(II) from mono and bicomponent aqueous solutions.

scholarly journals Adsorption process and mechanism of heavy metal ions by different components of cells, using yeast (Pichia pastoris) and Cu2+ as biosorption models

RSC Advances ◽  
2021 ◽  
Vol 11 (28) ◽  
pp. 17080-17091
Author(s):  
Xinggang Chen ◽  
Zhuang Tian ◽  
Haina Cheng ◽  
Gang Xu ◽  
Hongbo Zhou
Keyword(s):  
Heavy Metal ◽  
Pichia Pastoris ◽  
Metal Ions ◽  
Cell Walls ◽  
Heavy Metal Ions ◽  
Adsorption Process ◽  
Yeast Pichia Pastoris ◽  
Adsorption Sites

The Cu2+ first bound to the outer mannan and finally entered the cytoplasm. During the whole adsorption process, the number of adsorption sites in the outer and middle cell walls was the largest, and then gradually decreased.

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