scholarly journals Studies on Functionalization of Apple Waste for Heavy Metal Treatment

1970 ◽  
Vol 10 ◽  
pp. 135-139 ◽  
Author(s):  
Puspa Lal Homagai ◽  
Deepak Bashyal ◽  
Hari Poudyal ◽  
Kedar Nath Ghimire
Keyword(s):  
Heavy Metal ◽  
Cation Exchanger ◽  
Langmuir Adsorption Isotherm ◽  
Maximum Adsorption Capacity ◽  
Langmuir Adsorption ◽  
Metal Treatment ◽  
Sorption Mechanisms ◽  
Cadmium Zinc ◽  
Adsorbent Materials ◽  
Selective Behavior

The present investigation is to investigate the potential and effectiveness of two types of biosorbents as cation exchanger, functionalized with carboxylic acid and xanthated groups onto apple waste. Both the adsorbent materials exhibited highly selective behavior for heavy metal treatment and followed Langmuir adsorption isotherm model. The maximum adsorption capacity evaluated for iron, cadmium, zinc and lead onto them have shown their potential ability in the treatment of heavy metals from aqueous medium. Dominant sorption mechanisms are revealed to be ionexchange process.Key words: Adsorption; Biopolymer; Ion exchange; Saponification; XanthationDOI: 10.3126/njst.v10i0.2949 Nepal Journal of Science and Technology Vol. 10, 2009 Page:135-139

scholarly journals Sodium hydroxide modified rice husk for enhanced removal of copper ions

2018 ◽  
Vol 78 (7) ◽  
pp. 1615-1623 ◽  
Author(s):  
N. Priyantha ◽  
H. K. W. Sandamali ◽  
T. P. K. Kulasooriya
Keyword(s):  
Heavy Metal ◽  
Adsorption Capacity ◽  
Rice Husk ◽  
Copper Ions ◽  
Maximum Adsorption Capacity ◽  
Adsorption Model ◽  
Natural Form ◽  
Langmuir Adsorption ◽  
Pseudo Second Order ◽  
Heavy Metal Adsorbent

Abstract Although rice husk (RH) is a readily available, natural, heavy metal adsorbent, adsorption capacity in its natural form is insufficient for certain heavy metal ions. In this context, the study is based on enhancement of the adsorption capacity of RH for Cu(II). NaOH modified rice husk (SRH) shows higher extent of removal for Cu(II) ions than that of heated rice husk (HRH) and HNO3 modified rice husk (NRH). The extent of removal of SRH is increased with the concentration of NaOH, and the optimum NaOH concentration is 0.2 mol dm−3, used to modify rice husk for further studies. The surface area of SRH is 215 m2 g−1, which is twice as much as that of HRH according to previous studies. The sorption of Cu(II) on SRH obeys the Langmuir adsorption model, leading to the maximum adsorption capacity of 1.19 × 104 mg kg−1. Kinetics studies show that the interaction of Cu(II) with SRH obeys pseudo second order kinetics. The X-ray fluorescence spectroscopy confirms the adsorption of Cu(II) on SRH, while desorption studies confirm that Cu(II) adsorbed on SRH does not leach it back to water under normal conditions.

Adsorption of Cr(VI) from Aqueous Solutions Using Nano β-FeOOH and β-FeOOH/-Surfactant-Modified Zeolites

2014 ◽  
Vol 535 ◽  
pp. 637-640 ◽  
Author(s):  
Wen Si Wang ◽  
Yu Bin Zeng ◽  
Qing Quan Deng ◽  
Jia Wen Pan
Keyword(s):  
Langmuir Adsorption Isotherm ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Hexadecyltrimethylammonium Bromide ◽  
X Ray Diffraction ◽  
X Ray ◽  
Structure Information ◽  
Langmuir Adsorption ◽  
Zeolite Β ◽  
Modified Zeolites

Abstract. The effects of various parameters and the adsorption isotherms for the Cr(VI) removal by nano β-FeOOH and its innovative composite material with surfactant hexadecyltrimethylammonium bromide (HDTMA) modified zeolite (β-FeOOH/SMZ) were investigated and compared by batch adsorption experiments. The structure information and surface images of nano β-FeOOH and β-FeOOH/SMZ were characterized by X-ray diffraction (XRD) and Field-emission scanning electron microscopy (FE-SEM). From the experimental work, both β-FeOOH and β-FeOOH/SMZ were effective adsorbents in Cr (VI) removal, while β-FeOOH/SMZ was found to show higher adsorptivity than β-FeOOH. Additionally, the isotherm experimental data fits the Langmuir adsorption isotherm more closely, and the maximum adsorption capacity of Cr(VI) on β-FeOOH and β-FeOOH/SMZ can attain 20.79 mg/g and 22.08 mg/g, respectively.

Adsorption of Zn(II) from Aqueous Solution by Attapulgite

2014 ◽  
Vol 692 ◽  
pp. 149-155 ◽  
Author(s):  
Jun Ren ◽  
Dan Xu ◽  
Ling Tao ◽  
Zhao Wen Fu
Keyword(s):  
Aqueous Solution ◽  
Ionic Strength ◽  
Contact Time ◽  
Langmuir Adsorption Isotherm ◽  
Maximum Adsorption Capacity ◽  
Order Process ◽  
Langmuir Adsorption ◽  
Pseudo Second Order ◽  
Adsorbent Dose ◽  
Second Order Process

The adsorption behavior of Zn (II) by attapulgite were studied in the paper, The effects of adsorbent dose. Contact time, ionic strength and temperature on the adsorption were investigated. The maximum adsorption capacity is 4.129 mg.g-1 at 333 K. The kinetic study indicated that the adsorption was a pseudo-second-order process. The adsorption was well fitted by the Langmuir adsorption isotherm model. The results indicated that the sorption of Zn (II) by attapulgite was a spontaneous process, and the sorption was endothermic.

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 UTILIZAÇÃO DE BIOSSORVENTE NO TRATAMENTO DE ÁGUAS RESIDUÁRIAS RICAS EM COBRE (II) E SUA REUTILIZAÇÃO NA PRODUÇÃO DE ALFACE

Irriga ◽  
2018 ◽  
Vol 1 (1) ◽  
pp. 155-170
Author(s):  
Mara Lúcia Cruz de Souza ◽  
José Antonio Rodrigues de Souza ◽  
DÉBORA ASTONI MOREIRA ◽  
JOÃO DE JESUS GUIMARÃES ◽  
ELLEN LEMES SILVA ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Adsorption Isotherm ◽  
Low Cost ◽  
Langmuir Adsorption Isotherm ◽  
Copper Removal ◽  
Langmuir Adsorption ◽  
Removal Capacity ◽  
High Copper ◽  
Egg Shell

UTILIZAÇÃO DE BIOSSORVENTE NO TRATAMENTO DE ÁGUAS RESIDUÁRIAS RICAS EM COBRE (II) E SUA REUTILIZAÇÃO NA PRODUÇÃO DE ALFACE     MARA LÚCIA CRUZ DE SOUZA1; JOSÉ ANTONIO RODRIGUES DE SOUZA 2; DÉBORA ASTONI MOREIRA3; JOÃO DE JESUS GUIMARÃES 4; ELLEN LEMES SILVA 5 E JOÃO VICTOR COSTA6   Departamento de Engenharia Rural, Faculdade de Ciências Agronômicas – FCA – Unesp, Câmpus Botucatu, Avenida Universitária, 3780, CEP 18610-034, Altos do Paraíso, Botucatu/SP, Brasil, [email protected] Departamento de Engenharia Agrícola, Instituto Federal de Educação Ciência e Tecnologia Goiano-Campus Urutaí, Rodovia Geraldo Silva Nascimento Km 2,5, Zona Rural, Urutaí-GO, Brasil, [email protected] Departamento de Engenharia Agrícola, Instituto Federal de Educação Ciência e Tecnologia Goiano-Campus Urutaí, Rodovia Geraldo Silva Nascimento Km 2,5, Zona Rural, Urutaí-GO, Brasil, [email protected] Departamento de Engenharia Rural, Faculdade de Ciências Agronômicas – FCA – Unesp, Câmpus Botucatu, Avenida Universitária, 3780, CEP 18610-034, Altos do Paraíso, Botucatu/SP, Brasil, [email protected] Departamento de Recursos Naturais do Cerrado, Instituto Federal de Educação Ciência e Tecnologia Goiano-Campus Urutaí, Rodovia Geraldo Silva Nascimento Km 2,5, Zona Rural, Urutaí-GO, Brasil, [email protected] Instituto Federal de Educação Ciência e Tecnologia Goiano-Campus Urutaí, Rodovia Geraldo Silva Nascimento Km2.5, Zona Rural, Urutaí-GO, Brasil, [email protected]     1 RESUMO   Neste trabalho objetivou-se, estudar o tratamento de águas residuárias ricas em cobre por meio de biossorção, bem como o posterior reuso deste biossorvente na produção de alface. Para isso, avaliou-se a capacidade de remoção do cobre (II) pela casca de ovo moída por meio da isoterma de adsorção de Langmuir. Posteriormente, para estudar os efeitos do reuso deste adsorvente, diferentes doses foram adicionadas a vasos cultivados com alface, avaliando-se os efeitos no solo e na planta. Os resultados permitiram concluir que a casca de ovo moída apresentou elevada capacidade de remoção do cobre (25,4291 mg g-1), não havendo contaminação do solo e as plantas de alface apresentaram-se aptas para o consumo. Assim, a bioadssorção e o posterior reuso do adsorvente na produção de alface mostrou-se uma técnica ambientalmente adequada e de baixo custo. Palavras-chave: reuso, bioadssorvente, metal pesado.     SOUZA, M. L. C.1; SOUZA, J. A. R.2; MOREIRA, D. A.3; GUIMARÃES, J. J.4; SILVA, E. L.5; COSTA, J. V.6 USE OF BIOSORBENTS IN THE TREATMENT OF WASTEWATER RICH IN COPPER (II) AND THEIR REUSE ON LETTUCE PRODUCTION         2 ABSTRACT   The present work aimed at studying the treatment of wastewater rich in copper by biosorption, and the subsequent reuse of this biosorbent in the production of lettuce. For this, the capacity of copper (II) removal by the egg shell ground by means of the Langmuir adsorption isotherm was evaluated. Subsequently, the effects of reuse of this adsorbent was studied, and different concentrations were added to pots grown with lettuce, evaluating the effects on soil and plant. The results showed that the egg shell ground presented high copper removal capacity (25.4291 mg g-1), with no contamination of the soil and the lettuce plants were suitable for consumption. Thus, biosorption and subsequent reuse of the adsorbent in the production of lettuce proved to be an environmentally adequate and low-cost technique.   Keywords: reuse, biosorbent, heavy metal.

Ion exchange and adsorption of some heavy metals in a modified coconut coir cation exchanger

1996 ◽  
Vol 34 (11) ◽  
pp. 193-200 ◽  
Author(s):  
A. U. Baes ◽  
S. J. P. Umali ◽  
R. L. Mercado
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Cation Exchanger ◽  
Divalent Cations ◽  
Metal Cations ◽  
Langmuir Adsorption ◽  
Heavy Metal Cations ◽  
Relative Preference ◽  
Good Potential ◽  
Coconut Coir

Potentiometric titration experiments were carried out to determine the relative ability of sodium and different heavy metal cations in replacing protons from ionogenic sites of a modified coconut coir cation exchanger. The relative preference for the cations follow the sequence: Na ≪ Ca(II) &lt; Mn(II) &lt; Ni(II) &lt; Cu (II) &lt; Pb(II). This preferential series was confirmed by determining the concentrations of the divalent cations and sodium which were adsorbed by the material during the titration process. Adsorption isotherms at pH 4 and pH 6 were obtained to determine the Langmuir adsorption constants for the heavy metal cations. The adsorbent material adsorbed high amounts of Pb(II), Cu(II) and Ni(II) (in decreasing order) from solutions whose concentrations were comparable to those of wastewaters. Our results show that the modified coconut coir cation exchanger has good potential as an adsorbent of heavy metals in industrial wastewaters.

scholarly journals Removal of As(III) from Aqueous Solution Using Fe(III) Loaded Pomegranate Waste

2013 ◽  
Vol 30 ◽  
pp. 29-36 ◽  
Author(s):  
Sheela Thapa ◽  
Megh Raj Pokhrel
Keyword(s):  
Metal Ion ◽  
Chemical Society ◽  
Langmuir Adsorption Isotherm ◽  
Ion Concentration ◽  
Maximum Adsorption Capacity ◽  
Langmuir Adsorption ◽  
Batch System ◽  
Optimum Ph ◽  
Removal Of Arsenic ◽  
Adsorbent Dose

A study on As(III) removal using Fe(III) loaded pomegranate waste as an adsorbent is presented. The effects of initial metal ion concentration, contact time, adsorbent dose and pH of the solution on the removal of arsenic were investigated in a batch system. The optimum pH for As(III) adsorption using Fe(III)-loaded charred pomegranate waste [Fe-CPW] was found to be 9. The equilibrium has beenachieved in 2 hours. The maximum adsorption capacity (qmax) for the adsorption of As (III) was found tobe 50 mg/g. The experimental data fitted well with the Langmuir adsorption isotherm model.DOI: http://dx.doi.org/10.3126/jncs.v30i0.9332Journal of Nepal Chemical Society Vol. 30, 2012 Page:  29-36 Uploaded date: 12/16/2013   

Biogenic Jarosite: A Friendly Adsorbent for the Removal of Chromate from Aqueous Solution

2015 ◽  
Vol 737 ◽  
pp. 533-536 ◽  
Author(s):  
Dong Xue Xiao ◽  
Chang Ling Fang ◽  
Jun Zhou ◽  
Xiao Yi Lou ◽  
Jiu Hua Xiao ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Adsorption Isotherm ◽  
Mine Drainage ◽  
Langmuir Adsorption Isotherm ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Langmuir Adsorption ◽  
Adsorption Isotherm Models ◽  
Optimum Ph ◽  
Sulfate Leaching

Ferric hydrosulfate minerals are commonly byproducts of biotic oxidation of Fe (II) in acid mine drainage and biohydrometallurgy like biogenic jarosite. In this study, adsorption of Cr (VI) on jarosite was a rapid process and the optimum pH for Cr (VI) adsorption was found at 7.0. The variation of Cr (VI) adsorbed on jarosite fitted the Langmuir adsorption isotherm models and the maximum adsorption capacity was 3.23 mg/g. It was evident that anion exchange mechanism was responsible for Cr (VI) adsorption on jarosite based on the sulfate leaching data and optimum pH experiments.

scholarly journals Adsorption and Reduction of Aqueous Cr by FeS-Modified Fe-Al Layered Double Hydroxide

2021 ◽  
Vol 14 (1) ◽  
pp. 21
Author(s):  
Shuangshuang Zhang ◽  
Wenhui Zhang ◽  
Yazhen Wan
Keyword(s):  
Layered Double Hydroxide ◽  
Removal Efficiency ◽  
Langmuir Adsorption Isotherm ◽  
Maximum Adsorption Capacity ◽  
Efficient Removal ◽  
Reaction Conditions ◽  
Langmuir Adsorption ◽  
Ultrasonic Assisted ◽  
Co Precipitation ◽  
Double Hydroxide

To remedy the widespread chromium (Cr) pollution in the environment, this study mainly used the ultrasonic-assisted co-precipitation and precipitation methods to prepare FeS-modified Fe-Al-layered double hydroxide (FeS/LDH) composite material. The experimental results showed that FeS/LDH has higher removal efficiency of Cr in aqueous solution and stronger anti-interference ability than unmodified LDH. Under the same reaction conditions, the removal efficiency of total Cr(Cr(T)) using LDH was 34.85%, and the removal efficiency of Cr(VI) was 46.76%. For FeS/LDH, the removal efficiency of Cr(T) and Cr(VI) reached 99.57% and 100%, respectively. The restoration of Cr(T) and Cr(VI) by FeS/LDH satisfied the Langmuir adsorption isotherm. The maximum adsorption capacity of Cr(T) and Cr(VI) achieved 102.9 mg/g and 147.7 mg/g. The efficient removal of Cr by FeS/LDH was mainly based on the triple synergistic effect of anion exchange between Cr(VI) and interlayer anions, redox of Cr(VI) with Fe2+ and S2−, and co-precipitation of Fe3+ and Cr3+.

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