scholarly journals Kesetimbangan sorpsi ion seng(ii) pada partikel gambut

2018 ◽  
Vol 9 (3) ◽  
pp. 91
Author(s):  
M Munawar
Keyword(s):  
Protein Metabolism ◽  
Zinc Concentration ◽  
Batch Reactor ◽  
Isotherm Models ◽  
Zinc Ions ◽  
Sorption Equilibrium ◽  
Equilibrium Sorption ◽  
Erlenmeyer Flask ◽  
Initial Ph ◽  
Varied Response

Extensive exposure of  zinc(II) ions  may cause eminent health problems, such as stomach cramps, skin irritations, vomiting, anaemia, a damage of pancreas, the disturbance of protein metabolism, and also respiratory disorders. Due to these problems, zinc(II) concentration in drinking water should be controlled. Peat is one of the material that can be used  to minimize zinc(II)  ions from  a solution. The study was done to determine the performance and sorption equilibrium of zinc ions onto oligothropic peat particles. The sorption experiments were conducted in a several batch reactor of erlenmeyer flask at a constant temperature of 26 ± 3 oC. The initial zinc ions concentration and pH were varied. Response variable was residual zinc concentration that was measured spectrophotometrically. Experimental data show that the optimum sorption efficiency was about 90% for the initial zinc(II) concentration of 50 mg/L. Sorption equilibrium can be represented by the Freundlich and Langmuir isotherm models. For the initial pH of 6, the optimum sorption capacity, qo was 3,736 mg/g, and the Freundlich’s characteristic  constant, Kf was about 0,342 L/g.    Key words : peat, sorption equilibrium, sorption isotherm, zinc(II) ions AbstrakPaparan ion seng(II) pada kadar tertentu dapat menyebabkan berbagai masalah kesehatan seperti kram perut, iritasi kulit, batuk, anemia, kerusakan pankreas, gangguan metabolisme protein, penyumbatan pembuluh darah, hingga kerusakan sistem pernafasan. Karena itu, seng(II) termasuk kategori unsur yang harus dibatasi konsentrasinya dalam air minum. Gambut adalah salah satu material yang dapat digunakan untuk mengurangi ion seng dari larutan. Penelitian ini bertujuan untuk mempelajari performansi dan kesetimbangan sorpsi ion seng(II) pada partikel gambut oligotropik Indonesia. Penelitian dilakukan secara batch di dalam sejumlah labu erlenmeyer pada temperatur konstan 26 ± 3 oC. Eksperimen dilakukan dalam beberapa variasi konsentrasi awal ion seng dan pH. Data primer adalah konsentrasi residual seng dalam larutan yang diukur secara spektrofotometrik. Hasil penelitian menunjukkan bahwa efisiensi optimum sorpsi mencapai lebih dari 90% untuk konsentrasi awal seng 50 mg/L. Kesetimbangan sorpsi logam seng(II) pada partikel gambut dapat direpresentasikan dengan baik oleh model isoterm Freundlich dan Langmuir. Untuk rentang pH awal 6, nilai kapasitas sorpsi optimum, qo adalah 3,736 mg/g, sedangkan nilai konstanta karakteristik Freundlich, Kf  adalah 0,342 L/g. Kata kunci : efisiensi sorpsi, gambut, isoterm sorpsi, ion seng(II)

Adsorption of 4-Chloro-2,5-Dimethoxy Nitrobenzene by Activated Pyrolytic Char from Pine Sawdust

2014 ◽  
Vol 884-885 ◽  
pp. 190-194
Author(s):  
Wei Xiao ◽  
Ran Di Zhang ◽  
Yu Bing Song ◽  
Run Ping Han ◽  
Yan Qiang Li
Keyword(s):  
Solution Temperature ◽  
Isotherm Models ◽  
Dihydrogen Phosphate ◽  
Solution Ph ◽  
Pine Sawdust ◽  
Major Mechanism ◽  
Nacl Concentration ◽  
Initial Ph ◽  
Higher Temperature ◽  
Pyrolytic Char

The adsorption studies of 4-chloro-2,5-dimethoxy nitrobenzene (CDNB) from aqueous solution on pyrolytic char activated by ammonium dihydrogen phosphate from pine sawdust have been performed. Several experimental parameters like initial pH, NaCl concentration, contact time solution temperature were evaluated. Solution pH within 2-7 is favor of adsorption and it is advantage of adsorption at higher temperature. Langmuir, Freundlich and Temkin isotherm models were used to fit the experimental data and Temkin model was better. The adsorption capacity was up to 33.8 mg·g1at 323 K. The process is spontaneous and endothermic and physical action is major mechanism.

scholarly journals The role of Arthrobacter viscosus in the removal of Pb(II) from aqueous solutions

2017 ◽  
Vol 76 (7) ◽  
pp. 1726-1738 ◽  
Author(s):  
Raluca Maria Hlihor ◽  
Mihaela Roşca ◽  
Teresa Tavares ◽  
Maria Gavrilescu
Keyword(s):  
Aqueous Solutions ◽  
Isotherm Models ◽  
X Ray ◽  
Optimum Parameters ◽  
Living Biomass ◽  
Initial Ph ◽  
Edx Analyses ◽  
Arthrobacter Viscosus ◽  
Kinetic And Isotherm Models

The aim of this paper was to establish the optimum parameters for the biosorption of Pb(II) by dead and living Arthrobacter viscosus biomass from aqueous solution. It was found that at an initial pH of 4 and 26 °C, the dead biomass was able to remove 97% of 100 mg/L Pb(II), while the living biomass removed 96% of 100 mg/L Pb(II) at an initial pH of 6 and 28 ± 2 °C. The results were modeled using various kinetic and isotherm models so as to find out the mechanism of Pb(II) removal by A. viscosus. The modeling results indicated that Pb(II) biosorption by A. viscosus was based on a chemical reaction and that sorption occurred at the functional groups on the surface of the biomass. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy coupled with energy dispersive X-ray microanalysis (SEM-EDX) analyses confirmed these findings. The suitability of living biomass as biosorbent in the form of a biofilm immobilized on star-shaped polyethylene supports was also demonstrated. The results suggest that the use of dead and living A. viscosus for the removal of Pb(II) from aqueous solutions is an effective alternative, considering that up to now it has only been used in the form of biofilms supported on different zeolites.

scholarly journals The Sorption of Ni(II) by Grape Shell Ash from Aqueous Solution: Kinetic and Thermodynamic Studies

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Nahid Ghasemi ◽  
Maryam Ghasemi ◽  
Yaghoub Khosravi-Fard
Keyword(s):  
Rate Constants ◽  
Adsorption Process ◽  
Correlation Coefficients ◽  
Sorption Process ◽  
Maximum Increase ◽  
Equilibrium Sorption ◽  
Initial Concentration ◽  
Initial Ph ◽  
Solution Kinetic ◽  
Kinetic And Thermodynamic Studies

The sorption of Ni(II) onto grape shell ash (GSA) was studied by performing batch kinetic sorption experiments. The influences of major parameters in Nickel(II) ions sorption on GS such as initial of pH, initial concentration of Ni(II) ions, the initial temperatures of solution, and contact time were investigated. The maximum increase in the rate of sorption of Ni(II) ions on GS was observed at an initial pH = 5, initial concentration of nickel 50 mgL−1, temperature of solution (328 K), and t=90 min. The rate constants and the equilibrium sorption capacities were calculated. The results indicate that the sorption process follows the second-order kinetics and the values of rate constants were found to be 0.224, 0.402, 0.193 and 0.123 min−1 at 298, 308, 318, and 328 K, respectively. The values of correlation coefficients for the adsorption of Ni(II) on GSA from all the systems were found to be 0.999, and the values of predicted equilibrium sorption capacities showed good agreement with the experimental equilibrium uptake values. The thermodynamic parameters (ΔG°, ΔH°, and ΔS°) of the adsorption process were calculated, and these parameters showed that the adsorption process is spontaneous.

scholarly journals Uptake of Cationic Dyes from Aqueous Solution by Biosorption onto GranularMuntingia calabura

2009 ◽  
Vol 6 (3) ◽  
pp. 737-742 ◽  
Author(s):  
T. Santhi ◽  
S. Manonmani ◽  
S. Ravi
Keyword(s):  
Aqueous Solution ◽  
Low Cost ◽  
Freundlich Isotherm ◽  
Cationic Dyes ◽  
Isotherm Models ◽  
Experimental Conditions ◽  
Experimental Parameters ◽  
Initial Ph ◽  
Rate Kinetics ◽  
Muntingia Calabura

A new, low cost, locally available biomaterial was tested for its ability to remove cationic dyes from aqueous solution. A granule prepared from a mixture of leafs, fruits and twigs ofMuntingia calaburahad been utilized as a sorbent for uptake of three cationic dyes, methylene blue (MB), methylene red (MR) and malachite green (MG). The effects of various experimental parameters (e.g.,contact time, dye concentration, adsorbent dose and pH) were investigated and optimal experimental conditions were ascertained. Above the value of initial pH 6, three dyes studied could be removed effectively. The isothermal data fitted the Langmuir and Freundlich isotherm models for all three dyes sorption. The biosorption processes followed the pseudo-first order rate kinetics. The results in this study indicated thatMuntingia calaburawas an attractive candidate for removing cationic dyes from the dye wastewater.

Anaerobic bio-hydrogen production using pre-heated river sediments as seed sludge

2005 ◽  
Vol 52 (10-11) ◽  
pp. 31-39 ◽  
Author(s):  
J. Zuo ◽  
Y. Zuo ◽  
W. Zhang ◽  
J. Chen
Keyword(s):  
Hydrogen Production ◽  
Hydrogen Content ◽  
Ph Value ◽  
Batch Reactor ◽  
River Sediments ◽  
Organic Loading Rate ◽  
Seed Sludge ◽  
Initial Ph ◽  
Gas Separator ◽  
Different Levels

Anaerobic bio-hydrogen production is the focus in the field of bio-energy resources. In this paper, a series of batch experiments were conducted to investigate the effects of several factors on anaerobic bio-hydrogen producing process carried out by pre-heated river sediments. The results showed that several factors such as substrate and its concentration, temperature and the initial pH value could affect the anaerobic bio-hydrogen production in different levels. At 35°C and the initial pH of 6.5, using glucose of 20,000mg COD/L as substrate, the highest hydrogen production of 323.8ml-H2/g TVS in a 100ml batch reactor was reached, the specific hydrogen production rate was 37.7ml-H2/g TVSh, and the hydrogen content was 51.2%. Thereafter using the same pre-heated river sediments as seed sludge, continuous anaerobic bio-hydrogen production was achieved successfully in a lab-scale CSTR with gas-separator. At the organic loading rate of 36kg COD/m3d, the highest hydrogen production was 6.3–6.7l-H2/l-reactord, the specific hydrogen production was 1.3–1.4mol-H2/mol-glucose, and the hydrogen content in the gas was 52.3%. The effluent of the bio-reactor contained some small molecular organics, mainly including ethanol, acetate, butyrate and their molar proportion is 1 : 1 : 0.6.

Phosphorus recovery from sewage with a sustainable and low-cost treatment system

2019 ◽  
Vol 80 (5) ◽  
pp. 846-854
Author(s):  
Vitor Tonzar Chaves ◽  
Dione Mari Morita ◽  
Iara Regina Soares Chao ◽  
Ronan Cleber Contrera
Keyword(s):  
Constructed Wetland ◽  
Phosphorus Removal ◽  
Phosphorus Recovery ◽  
Maximum Efficiency ◽  
Integrative Approach ◽  
Isotherm Models ◽  
Phosphorus Concentration ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Initial Ph

Abstract This study proposes a technology conceived based on an integrative approach that aims to promote phosphorus recovery and to recycle ferric water treatment sludge (FWTS), using it as a phosphorus adsorbent which may be applied as a soil ameliorant after reaching saturation. The assessed pilot plant operated with a daily influent flow of 360 litres and presented a removal efficiency of 94.4% ± 3.2% for chemical oxygen demand (COD) and of 91.2% ± 7.8% for suspended solids. It also presented promising results for phosphorus removal. The maximum efficiency of dissolved reactive phosphorus removal was 95% on the first day and it decreased until reaching adsorbent saturation. The estimated breakthrough time was one year in the condition in which the filling medium of a second constructed wetland was only FWTS. In this situation, the effluent phosphorus concentration was 0.2 mg·L−1. The authors concluded that the application of FWTS in a constructed wetland bed is an interesting alternative. Batch adsorption experiments were run using phosphorus stock solution. Langmuir and Freundlich adsorption isotherm models were obtained for different initial pH values. The maximum adsorption capacity decreased as the initial pH was increased; values ranged from 4.76 mg P·g−1 (pH = 3.9) to 1.44 mg P·g−1 (pH = 9.0).

Biosorption of Ni (II) from Aqueous Solution by Aspergillus niger

2014 ◽  
Vol 556-562 ◽  
pp. 282-285
Author(s):  
Li Fang Zhang ◽  
Zhao Shao ◽  
Chun Yang Jiang
Keyword(s):  
Contact Time ◽  
Metal Uptake ◽  
Freundlich Isotherm ◽  
Isotherm Models ◽  
Freundlich Model ◽  
Optimum Ph ◽  
Initial Ph ◽  
Equilibrium Data ◽  
Increasing Temperature ◽  
Biosorption Equilibrium

In this study, Biosorption of Ni (II) ions from aqueous solution by using biomass ofAspergillusnigerwas investigated. Different parameters such as initial pH, Ni (II) ions concentration, contact time and temperature were explored. The biosorption of Ni (II) ions was highly pH dependent and the optimum pH for biosorption of Ni (II) ions was found to be 7.0. The biosorption equilibrium was established in about 30min of contact time. Ni (II) ions removal increased with increasing temperature in the studied range. Equilibrium uptake of Ni (II) ions onto biomass increased with increasing initial Ni (II) ions concentration (20-300mg/L). The Langmuir and Freundlich isotherm models were applied to experimental equilibrium data and the Langmuir model better described the equilibrium metal uptake than the Freundlich model. These results suggest that the biomass ofAspergillusnigeris a promising biosorbent for removal of nickel (II) ions from the wastewater.

Equilibrium and Thermodynamic Studies on Biosorption of Malachite Green from Aqueous Solution by Fungal Biomass

2011 ◽  
Vol 148-149 ◽  
pp. 470-473
Author(s):  
Li Fang Zhang
Keyword(s):  
Aqueous Solution ◽  
Malachite Green ◽  
Fungal Biomass ◽  
Ph Value ◽  
Freundlich Isotherm ◽  
Isotherm Models ◽  
Thermodynamic Studies ◽  
Biosorption Process ◽  
Initial Ph ◽  
Equilibrium Data

The biosorption of Malachite Green from aqueous solution was investigated by using pretreated fungal biomass in a batch system. The effects of initial pH, NaCl concentration, initial dye concentration and temperature on dye biosorption were studied. The results showed that the pretreated fungal biomass exhibited higher dye removal at initial pH value of 5.0-6.0. The bosorption capacity was increased with the increasing temperature in studied temperature range. The Langmuir and Freundlich isotherm models were applied to experimental equilibrium data and the Langmuir model better described the equilibrium dye uptake than the Freundlich model. Thermodynamic studies revealed that the biosorption process was successful, spontaneous and endothermic in nature.

Adsorption of Nitrobenzene and Benzoic Acid from Aqueous Solution by All-Silica Zeolite Beta

2011 ◽  
Vol 183-185 ◽  
pp. 1378-1382 ◽  
Author(s):  
Qing Dong Qin ◽  
Jun Ma ◽  
Da Fang Fu
Keyword(s):  
Aqueous Solution ◽  
Benzoic Acid ◽  
Contact Time ◽  
Batch Reactor ◽  
Zeolite Beta ◽  
Reactor System ◽  
Equilibrium Isotherm ◽  
Initial Concentration ◽  
Initial Ph ◽  
Increasing Temperature

All-silica zeolite beta (BEA) was tested for the ability to remove nitrobenzene and benzoic acid from aqueous solution. The effect of contact time, temperature, initial concentration and initial pH were investigated in a batch reactor system. Adsorption of nitrobenzene decreased with increase in temperature. The equilibrium isotherm was L-shaped. Nitrobenzene adsorption was independent of pH. Adsorption of benzoic acid increased with increasing temperature from 5 °C to 22 °C and decreased with increasing temperature from 22°C to 32 °C. The equilibrium isotherm was approximately S-shaped. Benzoic acid adsorption was dependent of pH. At pH8.0, benzoic acid can also be adsorbed effectively. The results above confirmed that BEA had the potential to be utilized as relatively effective adsorbent for nitrobenzene and benzoic acid removal.

scholarly journals Removing Thallium (I) Ion from Aqueous Solutions Using Modified ZnO Nanopowder

2016 ◽  
Vol 11 (7) ◽  
pp. 3777-3788 ◽  
Author(s):  
H. Dashti Khavidaki ◽  
M. H. Fekri
Keyword(s):  
Freundlich Isotherm ◽  
Isotherm Models ◽  
Phosphate Solution ◽  
Experimental Conditions ◽  
Batch Mode ◽  
Solution Interface ◽  
Zno Nanopowder ◽  
Exothermic Process ◽  
Initial Ph ◽  
Sodium Phosphate Solution

In this study, the adsorption of thallium (I) ion as a dangerous pollutant from aqueous solution onto modified ZnO nanopowder as a fairly cheap adsorbent has been examined in batch mode. It was known that modification of the adsorbent was necessary to reach a significant adsorption percentage. The adsorbent used here was modified by sodium phosphate solution. The effect of experimental conditions such as initial pH of solution, contact time, adsorbent dosage, initial concentration of thallium and temperature is studied. The results showed the dependence of the adsorption percentage to these conditions specially its pH. The maximum adsorption percentage of Tl (I) ions at 25±1oC was 92.8%. Freundlich isotherm model provided a better fit with the experimental data than Langmuir and Temkin isotherm models by high correlation. Separation factor, RL, values showed that modified ZnO nanopowder was favorable for the adsorption of Tl (I) ion. The negative value of ΔH0 showed that Tl (I) sorption is an exothermic process and the negative value of ΔS0 represented that there is a little decrease of randomness at the solid-solution interface during sorption.

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