scholarly journals Simultaneous adsorption of Cd2+ , Ni2+ and Pb2+ on peat

2019 ◽  
pp. 269-277 ◽  
Author(s):  
Ulis L. Söukand ◽  
Pille Kängsepp ◽  
Renata Söukand ◽  
Toomas Tenno
Keyword(s):  
Langmuir Isotherm ◽  
Adsorption Mechanism ◽  
Filter Material ◽  
Adsorption Efficiency ◽  
Isotherm Equation ◽  
Metal Solution ◽  
Molar Basis ◽  
Removal Of Heavy Metals ◽  
Langmuir Isotherm Equation ◽  
Ternary Metal

The aim of the present work was to investigate iflocally available untreated peat could beused as filter material for the removal of heavy metals from leachate. The aqueoussolutions containing Cd2+, Ni2+ and Pb2+ ions in single-metal and multi-metal solutionswere used to study the adsorption of metals on peat. The peat was obtained fromSouthern Estonia. The decomposition rate of the peat was H6-H7 on the von Post scale.In order to assess the adsorption mechanism, the amounts of Ca2+ and Mg2+ ions desorbedfrom untreated peat were measured and compared to the adsorption efficiency of Cd2+,Ni2+ and Pb2+ ions from solution on the peat. The desorption of other cations, such asAl3+, K+, Na+, Fe3+, Zn2+ etc. were negligible during all experiments. Adsorption batchisotherm studies were carried out by using IO experimental series with the initialconcentration of 10 - 300 mg/I. The samples were analyzed by using the axial ICP-AES.Results of the single- as well as multi-metal adsorptions show that peat can be effectivelyused. Adsorption of metals on molar basis was found in the indicated order: Pb2+ > Cd2+> Ni2+. The removal of single metal ions from ternary-metal solution was less than itsremoval from single-metal solution. However, the total adsorption capacity of metalsfrom multi-metal solution to peat increased. The Langmuir isotherm equation constantswere calculated and isotherms were drawn by using the program of calculating hyperbolefunctions. Correlations for Ni2+ and Cd2+ with the Langmuir isotherm equation was foundto be good, whereas for Pb2+ the plot (amount absorbed vs. the equilibrium aqueousconcentration) was linear.

scholarly journals MODEL ISOTERM FREUNDLICH DAN LANGMUIR OLEH ADSORBEN ARANG AKTIF BAMBU ANDONG (G. verticillata (Wild) Munro) DAN BAMBU ATER (G. atter (Hassk) Kurz ex Munro)

2017 ◽  
Vol 2 (1) ◽  
pp. 17 ◽  
Author(s):  
Murtihapsari Murtihapsari ◽  
Bertha Mangallo ◽  
Dini Dwi Handyani
Keyword(s):  
Adsorption Capacity ◽  
Activated Charcoal ◽  
Langmuir Isotherm ◽  
Physical Adsorption ◽  
Regression Coefficients ◽  
Maximum Adsorption Capacity ◽  
Optimum Conditions ◽  
Isotherm Equation ◽  
Freundlich Isotherms ◽  
Langmuir Isotherm Equation

Freundlich and Langmuir Isotherms Model by Active Chorcoal Adsorbent Bamboo Andong  (G. verticillata (Wild) Munro) and Bamboo Ater (G. atter (Hassk) Kurz ex Munro)          Diazinon insecticide adsorption by two types of adsorbent, namely activated charcoal bamboo andong (G. verticillata (Wild) Munro) and bamboo ater (G. atter (Hassk) Kurzex Munro) at optimum conditions determined the maximum adsorption capacity of both types of adsorbent. Data analysison the effect of concentration on the adsorption capacity was used Langmuir and Freundlich isotherms equation. It was obtained. That  the curve of adsorption isotherms of the Langmuir isotherm better modeled with linear regression coefficients were relatively more approach 1 is R2 = 0,996 for both types of adsorbents. Langmuir isotherm equation obtained from adsorpsi maximum capacity of activated charcoal bamboo andong (G. verticillata (Wild) Munro) of  4.630 mg/g (1,433.10-5 mol/g) with K = 0,332 (Kmol/L)-1 and Eads at -2,750 kJ/mol, while the activated charcoal bamboo ater (G. atter (Hassk) Kurzex Munro) produce the maximum adsorption capacity of 1,786 mg/g (5,868.10-6 mol/g) with K = 0,202 (Kmol/L)-1 and Eads = -3,898 kJ/mol, so the adsorption of both types of adsorbents indicated experiencing a physical adsorption (physisorption / fisisorpsi).Keyword: G. verticillata (Wild) Munro, G. atter (Hassk) Kurz ex Munro, Adsorption, Diazinon,  actived charcoal  ABSTRAK          Adsorpsi insektisida diazinon oleh dua jenis adsorben, yaitu arang aktif bambu andong (G. verticillata (Wild) Munro) dan bambu ater (G. atter (Hassk) Kurz ex Munro) pada kondisi optimum bertujuan untuk menentukan kapasitas adsorpsi maksimum dari kedua jenis adsorben. Analisis data pengaruh konsentrasi terhadap kapasitas adsorpsi digunakan persamaan isoterm Langmuir dan Freundlich. Berdasarkan data yang diperoleh, kurva isoterm adsorpsi lebih mengikuti model isoterm Langmuir dengan koefisien regresi linier yang relatif lebih mendekati 1 yaitu R2 = 0,996 untuk kedua jenis adsorben. Dari persamaan isoterm Langmuir diperoleh kapasitas adsorpsi maksimum arang aktif bambu andong (G. verticillata (Wild) Munro) sebesar 4,630 mg/g (1,433.10-5 mol/g) dengan K = 0,332 (Kmol/L)-1 dan Eads sebesar -2,750 kJ/mol, sedangkan arang aktif bambu ater (G. atter (Hassk) Kurz ex Munro) menghasilkan kapasitas adsorpsi maksimum sebesar 1,786 mg/g (5,868.10-6 mol/g) dengan K = 0,202 (Kmol/L)-1 dan Eads = -3,898 kJ/mol, sehingga adsorpsi kedua jenis adsorben diindikasikan mengalami adsorpsi secara fisik (physisorption/ fisisorpsi).Kata kunci : G. verticillata (Wild) Munro, G. atter (Hassk) Kurz ex Munro Adsorpsi, Diazinon, Arang aktif

Kinetic Study on Phosphorus Adsorption, Phosphorus Desorption, Nitrification, and Denitrification by Using Mineralized Refuse

2011 ◽  
Vol 340 ◽  
pp. 461-466
Author(s):  
Ding Long Li ◽  
Jing Si Tian ◽  
Hou Hu Zhang ◽  
Yi Min Zhang ◽  
Yue Xiang Gao
Keyword(s):  
Adsorption Capacity ◽  
Langmuir Isotherm ◽  
Maximum Adsorption Capacity ◽  
Phosphorus Adsorption ◽  
K Value ◽  
Isotherm Equation ◽  
Zero Order Kinetics ◽  
Langmuir Isotherm Equation ◽  
Nitrification And Denitrification ◽  
Phosphorus Desorption

The mineralized refuse has a well particle size distribution and is similar asirregularly polyhedron with the high contents of Fe, Al, and Ca, which might be thephosphorus pool. The absorption and desorption of phosphorus, nitrification, and denitrification in the mineralized refuse and clay has been investigated by using batch incubation, respectively. The variation of phosphorous adsorption in the mineralized refuse and clay is fitted the Langmuir isotherm equation. The maximum phosphorus adsorption capacity in the mineralized refuse calculated based on the Langmuir isotherm equation is 2914 mg kg-1. Both the maximum adsorption capacity and adsorption rate of phosphorus in the mineralized refuse are over 2.0-fold more than that of the clay. The desorption rate of phosphorus in the mineralized refuse is only about 30%. NH4+-N contents in the mineralized refuse samples fell from 129 mg N kg-1 to 83.0 mg N kg-1 within the first 24 h during the nitrification process. Accordingly, the NO3--N content in the mineralized increased from 137 mg N kg-1 to 170 mg N kg-1. While the decrease of NH4+-N contents and the increase of NO3--N contents in the clay was only 1/2 and 1/6 as large as in the mineralized refuse, respectively. During the denitrification process, the K-value of the fitted zero-order kinetics for NO3--N denitrification in the mineralized refuse was 6.5-fold higher than in the clay.

Study on Adsorption of Cd2+ by Modified Bamboo Charcoal

2014 ◽  
Vol 955-959 ◽  
pp. 2559-2563
Author(s):  
Wen Long Li ◽  
Yi Qing Chen ◽  
Jing Yu Wang ◽  
Lin Lin ◽  
Juan Yin ◽  
...  
Keyword(s):  
Nitric Acid ◽  
High Temperatures ◽  
Physical Adsorption ◽  
Bamboo Charcoal ◽  
Adsorption Efficiency ◽  
Solution Ph ◽  
Isotherm Equation ◽  
Freundlich Equation ◽  
Before And After ◽  
Langmuir Isotherm Equation

Modified bamboo charcoal was made by immersion with Nitric acid and heating at high temperatures. This paper compared the adsorption properties before and after modified bamboo charcoal which were used to treat the Cd2+solution. The influencing factors such as solution pH, adsorption time, charcoal dosage, initial Cd2+concentration, temperature were investigated. The results show that modified bamboo charcoal made by immersion with Nitric acid and heating at high temperatures improves the adsorption efficiency. The equilibrium of adsorption capacity is 6.65mg/g. Adding 15 g modified bamboo charcoal in every 1L Cd2+solution, the removing rate of Cd2+is above 99% after adsorbed 60min under pH from 4 to 8. The adsorption Cd2+process with modified bamboo charcoal accords with similar secondary dynamic model. Langmuir isotherm equation is more suitable than the Freundlich equation to describe the adsorption Cd2+process with modified bamboo charcoal. The adsorption Cd2+process is exothermic and physical adsorption.

scholarly journals Determination Of Adsorption Performance Of Hydrothermally Synthesized Nanocomposite

2019 ◽  
Vol 2 (3) ◽  
pp. 1218-1223
Author(s):  
Hasan Sayğılı
Keyword(s):  
Adsorption Isotherms ◽  
Adsorption Mechanism ◽  
Organic Dyes ◽  
Hydrothermal Process ◽  
Freundlich Isotherm ◽  
One Pot ◽  
Isotherm Equation ◽  
Adsorption Capacities ◽  
Langmuir Isotherm Equation

In this study, a novel nanocomposite was synthesized by a simple one-pot hydrothermal process and used as an adsorbent for the removal of methylene blue (MB) and methyl orange (MO) dyes from the aqueous medium. Overall findings from batch experiments demonstrated that the prepared nanocomposite material (Fe/GBHC) had good adsorption capacity for MB and MO. The maximum adsorption capacities of the Fe/GBHC were observed to be 11 mg/g for MB and 8.9 mg/g for MO at neutral pH of the solutions and at 303 K. To obtain the adsorption mechanism of the Fe/GBHC, the experiments of adsorption isotherms were researched. The adsorption isotherms of both dyes could be described by the Langmuir isotherm equation rather than the Freundlich isotherm equation, with a high correlation coefficient values. The results showed that the prepared Fe/GBHC material by the hydrothermal method could have potential application in the removal of organic dyes from waste water.

Study on Leachate Adsorption by Activated Carbon Made from Sewage Sludge and Straw

2014 ◽  
Vol 955-959 ◽  
pp. 2212-2216
Author(s):  
You Lan Chen ◽  
Shan Shan Wu
Keyword(s):  
Organic Matter ◽  
Activated Carbon ◽  
Sewage Sludge ◽  
Activated Sludge ◽  
Langmuir Isotherm ◽  
Removal Rate ◽  
Adsorption Behavior ◽  
Isotherm Equation ◽  
Monolayer Adsorption ◽  
Langmuir Isotherm Equation

Activated carbon of activated sludge and straw with pyrolysis was used as adsorbent, and its adsorption of organic matter in the leachate and influence facts were studied. The results showed that the economic and reasonable addition of straw in the raw of activated sludge was 45% and the optimum adsorption conditions were 40 min, duration of pH 4.0 and resin dosage 2%,the removal rate of COD reach 69.63%. Langmuir isotherm equation could better describe the adsorption behavior of COD on the activated carbon and it was a monolayer adsorption reaction.

scholarly journals Magnetic alginate beads with high basic dye removal potential and excellent regeneration ability

2017 ◽  
Vol 95 (8) ◽  
pp. 807-815 ◽  
Author(s):  
K.Z. Elwakeel ◽  
A.A. El-Bindary ◽  
A.Z. El-Sonbati ◽  
A.R. Hawas
Keyword(s):  
Langmuir Isotherm ◽  
Alginate Beads ◽  
Second Order ◽  
Regeneration Ability ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Isotherm Equation ◽  
Langmuir Isotherm Equation ◽  
Order Kinetic Model ◽  
Pseudo Second Order

The adsorption of crystal violet (CV) dye onto magnetic alginate (MAlg) composite from aqueous solutions was studied. Experiments were carried out as function of contact time, dosage, temperature, pH, and CV concentration in the solutions. Optimum CV uptake was observed at equilibrium pH 7 and most of the CV was sorbed within 30 min. The equilibrium adsorption data were analyzed using two common adsorption models: Langmuir and Freundlich. The results revealed that Langmuir isotherm fit the experimental results well. The maximum adsorption capacity obtained from Langmuir isotherm equation was 0.113 mmol g−1 at 298 ± 1 K. The kinetics adsorption of CV onto MAlg composite was investigated using the pseudo first-order and pseudo second-order kinetic models. The results showed that the adsorption of CV onto MAlg composite followed pseudo second-order kinetic model. Thermodynamic data indicated that the adsorption process is an endothermic and spontaneous reaction. Due to its outstanding adsorption capacities, MAlg composite is an excellent adsorbent for the removal of CV. The composite regeneration was greater than 98.6% with 0.01 mol/L HCl, and MAlg composite could be repeatedly utilized for CV removal with negligible loss in sorption capacity.

Adsorption Capacity of Cr(VI) by Modified Fly Ash from Aqueous Solution

2011 ◽  
Vol 393-395 ◽  
pp. 1089-1092
Author(s):  
Ru Liu ◽  
Xiao Xia Hang ◽  
Chun Ying Wang
Keyword(s):  
Aqueous Solution ◽  
Fly Ash ◽  
Langmuir Isotherm ◽  
Adsorption Process ◽  
Ph Value ◽  
Exothermal Reaction ◽  
Initial Concentration ◽  
Isotherm Equation ◽  
Langmuir Isotherm Equation ◽  
Modified Fly Ash

Various parameters (time, initial concentration, pH value and temperature) are investigated. The results show that with increasing the temperature decreased the absorbance. The optimal condition is that the maximum adsorption is 0.47mg•g-1 at303K, pH 1. Adsorption process fits the Langmuir isotherm equation, the adsorption reaction is exothermal reaction.

scholarly journals Sawdust for the Removal of Heavy Metals from Water: A Review

Molecules ◽  
2021 ◽  
Vol 26 (14) ◽  
pp. 4318
Author(s):  
Elie Meez ◽  
Abbas Rahdar ◽  
George Z. Kyzas
Keyword(s):  
Heavy Metals ◽  
Adsorption Mechanism ◽  
Freundlich Isotherm ◽  
Order Kinetic ◽  
Suitable Material ◽  
Removal Of Heavy Metals ◽  
Order Kinetic Model ◽  
Pseudo Second Order ◽  
And Control ◽  
Environmental Agencies

The threat of the accumulation of heavy metals in wastewater is increasing, due to their abilities to inflict damage to human health, especially in the past decade. The world’s environmental agencies are trying to issue several regulations that allow the management and control of random disposals of heavy metals. Scientific studies have heavily focused on finding suitable materials and techniques for the purification of wastewaters, but most solutions have been rejected due to cost-related issues. Several potential materials for this objective have been found and have been compared to determine the most suitable material for the purification process. Sawdust, among all the materials investigated, shows high potential and very promising results. Sawdust has been shown to have a good structure suitable for water purification processes. Parameters affecting the adsorption mechanism of heavy metals into sawdust have been studied and it has been shown that pH, contact time and several other parameters could play a major role in improving the adsorption process. The adsorption was found to follow the Langmuir or Freundlich isotherm and a pseudo second-order kinetic model, meaning that the type of adsorption was a chemisorption. Sawdust has major advantages to be considered and is one of the most promising materials to solve the wastewater problem.

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