scholarly journals Study on the ability to remove Cd2+ ions in water environment by using halloysite mixture from Thach Khoan area, Phu Tho

2021 ◽  
Vol 5 (1) ◽  
pp. first
Author(s):  
BAC HOANG BUI ◽  
Võ Thị Hạnh ◽  
Lê Thị Duyên ◽  
Nguyễn Thị Thanh Thảo ◽  
Khương Thế Hùng ◽  
...  
Keyword(s):  
Room Temperature ◽  
Adsorption Process ◽  
Water Environment ◽  
Langmuir Adsorption Isotherm ◽  
Raw Material ◽  
Polluted Water ◽  
Ion Adsorption ◽  
Initial Concentration ◽  
Langmuir Adsorption ◽  
Monolayer Adsorption

Thach Khoan, Phu Tho area is the area with great potential for weathered kaolinite source from pegmatites of the Tan Phuong complex. This kaolin has quite good quality and is used in many traditional applications such as high quality ceramic glaze, high-grade bricks. However, the use of this material in the treatment of water pollution is still limited. In this study, the natural kaolin material from Thach Khoan area, Phu Tho province with about 87% amount of tubular halloysites was used to remove Cd2+ ion from water. The factors of pH, contact time, the adsorbent weight, and initial concentration of Cd2+ were studied to access their effects on the Cd2+ ion adsorption process using this raw material. The results indicated that under the conditions of pH0 of 6.5 and at room temperature (25 oC), with 0.8 g of halloysite powder and Cd2+ initial concentration of 30 mg/L, the adsorption of Cd2+ could reach equilibrium after 50 minutes with an efficiency of 86.31%. The adsorption process follows the Langmuir adsorption isotherm model with the maximum monolayer adsorption capacity of 2.75 mg/g and follows the second-order pseudo-adsorption kinetic equation. The results show that the natural halloysite material without treatment has the potential in using to remove heavy metal ions in polluted water and needs to be studied further.

Behavior of Phosphorus Adsorption from Aqueous Solutions on Modified Activated Alumina

2010 ◽  
Vol 152-153 ◽  
pp. 945-949
Author(s):  
Chun Sheng Ding ◽  
Ying Long Zou ◽  
Fang Ming Ni ◽  
Qian Fen Zhu
Keyword(s):  
Phosphorus Removal ◽  
Adsorption Process ◽  
Langmuir Adsorption Isotherm ◽  
Phosphorus Concentration ◽  
Activated Alumina ◽  
Phosphorus Adsorption ◽  
Langmuir Adsorption ◽  
Ph Values ◽  
Monolayer Adsorption ◽  
Adsorption Data

In the study, activated alumina was modified by calcium chloride, and after modification the phosphorus removal from aqueous solution increased by 13% or so. Then the activated alumina with and without treatment were subjected to characterization by the methods of the BET and SEM, and the adsorption characteristics of modified activated alumina were further studied at different contact time, pH values, adsorbent dosage levels and initial phosphorus concentration. Moreover, the equilibrium adsorption data for phosphorus were better fitted to Langmuir adsorption isotherm, and it means that the uptake of phosphorus preferably followed the monolayer adsorption process.

scholarly journals Synthesis of adsorbent materials from FELDSPAR for removal of ammonium in water

2020 ◽  
Vol 4 (1) ◽  
pp. first
Author(s):  
Nguyen Thanh Tam ◽  
Nguyen Hoai Phuong Duy ◽  
Tran Thi Phuong Thuy ◽  
Võ Thi Thanh Tien ◽  
Tran Cong Khanh
Keyword(s):  
Adsorption Process ◽  
Langmuir Adsorption Isotherm ◽  
Adsorption Efficiency ◽  
Experimental Conditions ◽  
Initial Concentration ◽  
Langmuir Adsorption ◽  
Surface Areas ◽  
Removal Capacity ◽  
Al Powder ◽  
Adsorbent Materials

In this study, adsorbent materials from natural feldspar were fabricated for application in +NH4 removal. Raw, pretreated by HCl 3M, and modified feldspar by NaOH and aluminum (Al powder, Al(OH)3, and AlCl3.6H2O) were used. Feldspar was modified under different experimental conditions including without calcination and calcinated at 500ºC and 700ºC. The influence of various operating parameters consisting of material size, adsorption time, +NH4 initial concentration and material dosage were investigated. Adsorbent materials < 0.1 mm in size showed the highest adsorption efficiency. Subsequently materials with size of < 0.1 mm were used for the following studies to investigate the affect of other parameters on +NH4 adsorption process. The highest removal efficiency (31.10%) and removal capacity (21.80 mg/g) were obtained by modified feldspar by NaOH and AlCl3.6H2O with calcination at 700ºC at +NH4 initial concentration of 5 ppm. Results from the scanning electron microscope (SEM) showed the differences on surfaces of adsorption materials. Modified feldspar had a clean surface and more tiny pores compared to those of raw and pretreated feldspar resulting in an increased surface area. Consequently +NH4 adsorbent efficiency and removal capacity were increased. By BET (Brunauer, Emmett and Teller) the specific surface areas of adsorbent materials were analyzed and the surface areas of raw, pretreated and modified feldspar were 0.484 m2/g, 0.988 m2/g and 2.024 m2/g, respectively. +NH4 adsorbent mechanisms of all raw, pretreated, and modified feldspar materials were found to follow the Langmuir adsorption isotherm with the correlation coefficient R2 = 0.989 which described the monolayer type of the adsorption.

scholarly journals Removal of Cadmium(II) from Water using Modified Citrus limettioides Peels: Thermodynamic and Isotherm Studies

2019 ◽  
Vol 32 (1) ◽  
pp. 73-78
Author(s):  
P. Janaki ◽  
R. Sudha ◽  
T.S. Sribharathi ◽  
P. Anitha ◽  
K. Poornima ◽  
...  
Keyword(s):  
Adsorption Process ◽  
Low Cost ◽  
Raw Material ◽  
Isotherm Models ◽  
Batch Adsorption ◽  
Adsorption Method ◽  
Chemically Modified ◽  
Adsorption Performance ◽  
Monolayer Adsorption ◽  
Isotherm Equations

The adsorption performance of sulphuric acid treated low cost adsorbent synthesized by using Citrus limettioides peel as an effective raw material for the removal of cadmium(II) from water. The batch adsorption method was carried out to optimize some parameters like contact time, pH and adsorbent dose. The nonlinear isotherm equations were used to calculate the different isotherm constant of five isotherm models namely Freundlich, Langmuir, Dubinin-Radushkevich, Redlich-Peterson and Sips. The Langmuir monolayer adsorption capacity of chemically modified Citrus limettioides peel was found to be 287.60 mg g-1. The negative values of ΔGº and ΔHº showed that the adsorption process is spontaneous and exothermic.

Ferric ion adsorption and electrodesorption by carbon nanotubes and nanofibres films

2009 ◽  
Vol 59 (8) ◽  
pp. 1657-1663 ◽  
Author(s):  
Haibo Li ◽  
Likun Pan ◽  
Yanping Zhang ◽  
Zhuo Sun
Keyword(s):  
Carbon Nanotubes ◽  
Adsorption Process ◽  
Physical Adsorption ◽  
Chemical Vapor ◽  
Ion Adsorption ◽  
Order Model ◽  
First Order ◽  
Monolayer Adsorption ◽  
Pressure Chemical ◽  
Kinetics And Isotherms

Carbon nanotubes and nanofibres (CNTs-CNFs) films have been grown on Ni sheets by low pressure chemical vapor deposition system and show good physical adsorption capability for ferric (Fe3 + ) ions. The studies of adsorption kinetics and isotherms indicate that Fe3 +  adsorption process was regarded as first-order model and followed a Langmuir isotherm indicating monolayer adsorption. The saturated CNTs-CNFs film is easy to be regenerated by electrodesorption with direct voltage applied. The result shows that the combination of adsorption and electrodesorption by CNTs-CNFs is a promising technology to remove the Fe3 +  contamination in solution, which can be further extended to the process of other heavy metal ions.

scholarly journals Treatment of Textile Wastewaterby Adsorption and Coagulation

2010 ◽  
Vol 7 (4) ◽  
pp. 1468-1476 ◽  
Author(s):  
Himanshu Patel ◽  
R. T. Vashi
Keyword(s):  
Room Temperature ◽  
Ferrous Sulphate ◽  
Langmuir Adsorption Isotherm ◽  
Ferric Sulphate ◽  
Contact Duration ◽  
Textile Mill ◽  
Langmuir Adsorption ◽  
Different Doses ◽  
Adsorbent Dose ◽  
Maximum Removal

The composite of wastewater treatment was carried out using activated charcoal as adsorbent to remove COD, BOD, color in which various parameters like adsorbent dose, contact duration, temperature and agitator speed were considered. The adsorbent behavior can be explained on the basis of Freundlich and Langmuir adsorption isotherm model. Maximum removal (87.6, 81.0 and 90.0%) of COD, BOD and color respectively was found at adsorbent dosage of 11 g/L. Also, the textile mill wastewater was treated with different doses of coagulants like alum, ferric sulphate and ferrous sulphate at constant contact duration (4 hours) and room temperature (300 K). Percentage reduction (maximum) corresponds to 80.2, 74.0 and 84.9% was obtained for removal of COD, BOD and color respectively.

scholarly journals A thermometric study on the kinetics of the acid dissolution of aluminium in the presence of Napoleonaea imperialis seeds extract and iodide ions

2018 ◽  
Vol 29 (2) ◽  
pp. 103-109 ◽  
Author(s):  
Habibat Faith Chahul ◽  
Gloria Ihuoma Ndukwe ◽  
David Ogwu Ogwu
Keyword(s):  
Free Energy ◽  
Inhibition Efficiency ◽  
Adsorption Process ◽  
Langmuir Adsorption Isotherm ◽  
Seed Extract ◽  
Considerable Extent ◽  
Acid Dissolution ◽  
Iodide Ions ◽  
Langmuir Adsorption ◽  
Kinetics Of

Abstract The dissolution of aluminum alloy AA 1060 in 0.5 M and 1.0 M HCl was investigated using thermometric measurements. The reaction number of the aluminum coupons varied linearly with the concentration of the acid. Addition of Napoleonaea imperialis seed extract to the dissolving aluminium coupons lowered the reaction number in both concentrations of HCl by inhibiting the dissolution process. The inhibition efficiency of Napoleonaea imperialis seed extract was enhanced to a considerable extent in the presence of iodide ions with the synergistic parameter S > 1. The adsorption of Napoleonaea imperialis extract on the aluminium surface best aligned with the Langmuir adsorption isotherm model. The values of the free energy, ΔGadsfor the adsorption process revealed the process to be spontaneous and physisorptive.

scholarly journals Malachite Green Removal by Zn/Al-citrate LDHs in Aqueous Solution

2020 ◽  
Vol 5 (2) ◽  
pp. 59
Author(s):  
Nurlisa Hidayati ◽  
Risfidian Mohadi ◽  
Elfita Elfita ◽  
Aldes Lesbani
Keyword(s):  
Aqueous Solution ◽  
Malachite Green ◽  
Adsorption Process ◽  
Langmuir Adsorption Isotherm ◽  
Precipitation Method ◽  
Chemical Adsorption ◽  
Langmuir Adsorption ◽  
Batch System ◽  
Isotherm Adsorption ◽  
Co Precipitation

Zn/Al-citrate LDHs was synthesized using co precipitation method at basic condition and the material were applied as adsorbent of malachite green (MG) dye in aqueous medium using batch system. Adsorption of MG onto Zn/Al-citrate was investigated through kinetic, isotherm adsorption and thermodynamic studies. Kinetic model was fitted PSO than PFO for MG adsorption. The rate of adsorption 𝑘2 for Zn/Al LDHs was 0.000692 g.mg−1 min−1 and 0.000371 g for Zn/Al-citrate LDHs.mg−1 min−1. Adsorption of malachite green onto Zn/Al LDHs and Zn/Al citrate LDHs was investigated and following Langmuir adsorption isotherm model shows chemical adsorption process. The adsorption capacity maximum of Zn/Al-citrate is 333 mg/g from Zn/Al LDHs is only 111 mg/g. Thermodynamic parameters of Zn/Al-citrate confirmed adsorption process was endothermic and spontaneous.

scholarly journals Effective removal of Cu2+ ions from polluted water using new bio-adsorbents

2021 ◽  
Vol 16 (2) ◽  
pp. 566-581
Author(s):  
B. Jagadeeswara Reddy ◽  
Sneha Latha Pala ◽  
Wondwosen Kebede Biftu ◽  
M. Suneetha ◽  
Kunta Ravindhranath
Keyword(s):  
Functional Groups ◽  
Adsorption Process ◽  
Polluted Water ◽  
Order Model ◽  
Langmuir Adsorption ◽  
Effective Removal ◽  
High Sorption ◽  
Pseudo Second Order ◽  
Surface Complex Formation ◽  
Polluted Lake

Abstract Sorbents derived from stem powders of Feronia limonia (FLSP), Amorphophallus paeoniifolius (APSP) and Pumpkin (Cucurbitapepo) (PSP) plants are investigated for the removal of Cu2+ ions from polluted water by adopting batch methods of extraction. Extraction conditions are optimized for the effective removal of Cu2+ ions. High sorption capacities are observed: 175.5 mg/g for FLSP; 140.4 mg/g for APSP; 130.0 mg/g for PSP. Effective pH ranges are: 5 to 10 for FLSP; 6 to 10 for APSP and 7 to 10 for PSP. The three spent adsorbents can be regenerated and used. Thermodynamic parameters indicate that the adsorption process is spontaneous, endothermic and have positive change in entropy values. As ΔH values are more than 25.0 kJ/mole, the adsorption may be due to surface complex formation between Cu2+ ions and functional groups of the adsorbents viz., -OH, -COOH etc. in the effective pH ranges. The good adsorption behaviour of FLSP even in acidic pHs may be due to the ion-exchange of Cu2+ ions for H+ ions of the functional groups of the adsorbent. The Langmuir adsorption isotherm and pseudo second-order model describe well the adsorption process. The sorbents are effectively applied to treat effluents from Cu-based industries and polluted lake water.

Synthesis of Hematite (α-Fe2O3) Nanostructures by Thermal Oxidation of Iron Sheet for Cr (VI) Adsorption

2018 ◽  
Vol 775 ◽  
pp. 395-401 ◽  
Author(s):  
Christian Laurence E. Aquino ◽  
Mikko James C. Bongar ◽  
Anfernee B. Silvestre ◽  
Mary Donnabelle L. Balela
Keyword(s):  
Water Vapor ◽  
Thermal Oxidation ◽  
Adsorption Process ◽  
Sem Images ◽  
Chromium Ion ◽  
Langmuir Adsorption ◽  
Monolayer Adsorption ◽  
Pseudo Second Order ◽  
Kinetic And Thermodynamic Studies ◽  
Positively Charged

In this study, hematite (α-Fe2O3) nanostructures were synthesized via thermal oxidation of Fe sheet in dry air and in water vapor. SEM images show nanoblades and nanowires growing on the surface of the sheet. Samples synthesized in water vapor generally produced larger nanostructures while samples oxidized in higher temperatures formed taller and slender nanostructures. The α-Fe2O3nanostructures were used as adsorbent for Cr (VI) in acidic medium. Chromium removal was highest with the samples synthesized at 650°C in water vapor with 95% efficiency. Kinetic and thermodynamic studies revealed that the adsorption process strongly followed pseudo-second order kinetics model and is endothermic. The process also follows the Langmuir adsorption isotherm model, suggesting that the process is described by homogeneous, monolayer adsorption. Adsorption of Cr (VI) onto hematite may be attributed to the electrostatic reaction between the positively charged hematite adsorbent and negative chromium ion.

Synthesis of a Novel Hexanedioyl Thiourea Resin and its Adsorption Properties for Ag(I)

2012 ◽  
Vol 217-219 ◽  
pp. 1213-1217
Author(s):  
Zhong Nan Wang ◽  
Hong Zhong ◽  
Shuai Wang
Keyword(s):  
Adsorption Process ◽  
Adsorption Equilibrium ◽  
Interfacial Polymerization ◽  
Langmuir Adsorption Isotherm ◽  
Adsorption Properties ◽  
Chelating Resin ◽  
Langmuir Adsorption ◽  
Polyethylene Polyamine ◽  
Ft Ir ◽  
Equilibrium Adsorption Capacity

A novel hexanedioyl thiourea chelating resin(HTR) was synthesized through interfacial polymerization of hexanedioyl diisothiocyanate and polyethylene polyamine. Its structure was confirmed by FT-IR. The adsorption properties of HTR for Ag(I) were investigated by batch operation . The results show that the adsorption equilibrium of HTR for Ag(I) is achieved after 12 hour at 20°C, the equilibrium adsorption capacity is 4.56mmol/g and increases as the temperature or pH rises, the adsorption process accords with G. E. Boyd equation and Langmuir adsorption isotherm as well, and the silver-loaded resins can be quantitatively eluted by a solution containing 6% thiourea in 1mol/L HNO3.

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