scholarly journals Development of Bi-Langmuir model on the sorption of cadmium onto waste foundry sand: Effects of initial pH and temperature

2019 ◽  
Vol 25 (5) ◽  
pp. 677-684 ◽  
Author(s):  
Noora Saad ◽  
Ziad T. Abd Ali ◽  
Laith A. Naji ◽  
Ayad A.A.H. Faisal ◽  
Nadhir Al-Ansari
Keyword(s):  
Functional Groups ◽  
Langmuir Model ◽  
Coefficient Of Determination ◽  
Affinity Constant ◽  
Maximum Adsorption Capacity ◽  
Foundry Sand ◽  
Squared Error ◽  
Initial Ph ◽  
Effects Of Ph ◽  
Waste Foundry Sand

The present study develops the sorption model for simulating the effects of pH and temperature on the uptake of cadmium from contaminated water using waste foundry sand (WFS) by allowing the variation of the maximum adsorption capacity and affinity constant. The presence of two acidic functional groups with the same or different affinity is the basis in the derivation of the two models; Model 1 and Model 2 respectively. The developed Bi-Langmuir model with different affinity (Model 2) has a remarkable ability in the description of process under consideration with coefficient of determination > 0.9838 and sum of squared error < 0.08514. This result is proved by FTIR test where the weak acids responsible of cadmium ions removal using WFS sorbent can be represented by surface silanol (O-H) functional groups.

scholarly journals SIMULTANEOUS ADSORPTION OF TETRACYCLINE AND AMOXICILLIN BY CLADOPHORA AND SPIRULINA ALGAE BIOMASS

2021 ◽  
Vol 52 (5) ◽  
pp. 1290-1303
Author(s):  
I. N. Abd ◽  
M. J. Mohammed-Ridha
Keyword(s):  
Low Cost ◽  
Agitation Speed ◽  
Langmuir Model ◽  
Coefficient Of Determination ◽  
Isotherm Models ◽  
Order Kinetic ◽  
Batch Mode ◽  
Algae Biomass ◽  
Initial Ph ◽  
Biomass Dosage

Adsorption studies were performed at different initial Tetracycline (TC) and Amoxicillin (AMO) concentration, different biomass dosage and type, contact time, agitation speed, and initial pH.  In the batch mode were investigated. The optimum pH of solutions is 6.5 for TC and 5 for AMO, agitation speed 200 rpm and concentration 50 ppm. The results in FTIR showed that there were -OH and amides (N-H) and other functional groups on the surface of Cladophora and Spirulina algae. The equilibrium isotherm data were modeled with Freundlich, Temkin, and Langmuir isotherm models. The data best fitted with the Langmuir model. The maximal adsorption capacity from the Langmuir model was (9.86, 20. 5 mg/g) for TC and (7.89, 17.4 mg/g) for AMO on Cladophora and Spirulina algae, respectively. Finally, the pseudo-second-order kinetic model was best fitted the experimental kinetic data of TC and AMO onto Cladophora and Spirulina algae biomass with a high coefficient of determination between 0.97 and 0.99.    Cladophora and Spirulina algae, low-cost and eco-friendly adsorbents, can be used to adsorb the TC and AMO from the solution.

scholarly journals Waste Foundry Sand as Permeable and Low Permeable Barrier for Restriction of the Propagation of Lead and Nickel Ions in Groundwater

2020 ◽  
Vol 2020 ◽  
pp. 1-13
Author(s):  
Ayad A. H. Faisal ◽  
Zaid Abed Al-Ridah ◽  
Laith A. Naji ◽  
Mu. Naushad ◽  
Hamed A. El-Serehy
Keyword(s):  
Permeable Reactive Barrier ◽  
Coefficient Of Determination ◽  
Infrared Analysis ◽  
Permeability Barrier ◽  
Foundry Sand ◽  
Nickel Ions ◽  
Maximum Sorption Capacity ◽  
Maximum Sorption ◽  
Waste Foundry Sand ◽  
The Fourier Transform

This work aims to investigate the ability of using waste foundry sand (WFS) resulting as inexpensive by-product from steel industry in the low permeability barrier (LPB) and permeable reactive barrier (PRB) technologies for restriction of the movement of lead and nickel ions in the groundwater. Outputs of flask and tank tests certified that this material could capture these ions with sorption efficiency greater than 95% at time, pH, sorbent dosage, and speed equal to 60 min, 4 for lead and 6 for nickel, 2.5 g/100 mL, and 250 rpm, respectively. Sorption isotherm measurements were represented in a good manner by Langmuir model in comparison with Freundlich model with coefficient of determination (R2) greater than 0.99. So, the chemisorption was the predominant mechanism which could be supported by O-H, H-O-H, C-O, O-Si-O, and Si-O functional groups based on the Fourier transform infrared analysis. The maximum sorption capacity of WFS was 13.966 and 4.227 mg/g for lead and nickel ions, respectively, with corresponding affinities equal to 0.647 and 0.099 L/mg. Measurements signified that the hydraulic conductivity of WFS was 3.8 × 10−7 cm/s which satisfies the requirements of LPB. To obtain the acceptable values of permeability and reactivity, PRB was prepared from mixing 18% WFS with 82% filter sand. COMSOL software was able to simulate the measurements of two-dimensional tank packed with Iraqi soil aquifer in combination with WFS-LPB and WFS-filter sand PRB. Thicker barriers have a high ability in the protection of locations in the down-gradient side because their longevity increased dramatically with increase of barrier thickness.

Adsorption of lead using a novel xanthated carboxymethyl chitosan

2013 ◽  
Vol 69 (2) ◽  
pp. 298-304 ◽  
Author(s):  
Qingping Song ◽  
Chongxia Wang ◽  
Ze Zhang ◽  
Jiangang Gao
Keyword(s):  
Adsorption Capacity ◽  
Photoelectron Spectroscopy ◽  
Adsorption Mechanism ◽  
Ph Value ◽  
Carboxymethyl Chitosan ◽  
Langmuir Model ◽  
Maximum Adsorption Capacity ◽  
Visible Spectra ◽  
Initial Ph ◽  
Uv Visible

Adsorption of Pb(II) was studied using a novel xanthated carboxymethyl chitosan (XCC). The XCC was synthesized using the xanthation reaction of N-carboxymethyl chitosan (NCMC). The chemical structure of XCC was characterized by UV–visible spectra. The effects of initial pH value of the solutions, contact time and adsorption isotherms on adsorption of Pb(II) were investigated. Moreover, the possible adsorption mechanism was identified using Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). The experimental results showed XCC experienced a high adsorption capacity. The adsorption isotherm followed the Langmuir model. The maximum adsorption capacity obtained from the Langmuir model was 520.8 mg/g. Thermodynamic studies revealed a spontaneous and exothermic adsorption process. FTIR and XPS studies showed that the carboxyl groups, nitrogen atoms and sulfur atoms participated in the adsorption of Pb(II).

scholarly journals Removing Pb(II) Ions from Aqueous Solution by a Promising Absorbent of Tannin-Immobilized Cellulose Microspheres

Polymers ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 548 ◽  
Author(s):  
Ying Pei ◽  
Gaoqiang Xu ◽  
Xiao Wu ◽  
Keyong Tang ◽  
Guozhen Wang
Keyword(s):  
Aqueous Solution ◽  
Physical Adsorption ◽  
Low Cost ◽  
Maximum Adsorption Capacity ◽  
Order Kinetic ◽  
Adsorption Behaviors ◽  
Initial Ph ◽  
Effects Of Ph ◽  
Order Kinetic Model ◽  
Pseudo Second Order

Tannin/cellulose microspheres (T/C) were successfully prepared via a facile homogeneous reaction in a water/oil (W/O) emulsion for removing Pb(II) ions from aqueous solution. The structure of the microspheres was characterized by scanning electron microscopy (SEM), Fourier-transform infrared (FTIR) spectroscopy, and a zeta potential test. The effects of pH, adsorbent dosage, contact time, and temperature on adsorption ability were investigated. The results showed that T/C microspheres could combine Pb(II)ions via electrostatic attractions and physical adsorption. Adsorption kinetics could be better described by the pseudo-second-order kinetic model. The adsorption behaviors were in agreement with the Langmuir adsorption isotherm model with a fitting correlation coefficient of 0.9992. The maximum adsorption capacity was 23.75 mg/g from the Langmuir isotherm evaluation at 308K with an initial pH of 5. The results suggested that tannin/cellulose microspheres could be a low-cost and effective adsorbent for removing Pb(II) ions from aqueous solution.

A multistakeholder approach and techno-economic analysis of a mechanical reclamation process for waste foundry sand in the Indian context

2021 ◽  
Vol 167 ◽  
pp. 105437
Author(s):  
Mohd Moiz Khan ◽  
S.M. Mahajani ◽  
G.N. Jadhav ◽  
Rohit Vishwakarma ◽  
Vithoba Malgaonkar ◽  
...  
Keyword(s):  
Economic Analysis ◽  
Foundry Sand ◽  
Indian Context ◽  
Waste Foundry Sand ◽  
Reclamation Process

Geotechnical behavior of a compacted waste foundry sand

2021 ◽  
Vol 277 ◽  
pp. 122267
Author(s):  
Marcelo Heidemann ◽  
Helena Paula Nierwinski ◽  
Daniel Hastenpflug ◽  
Breno Salgado Barra ◽  
Yader Guerrero Perez
Keyword(s):  
Foundry Sand ◽  
Waste Foundry Sand

Influence of Fungus on Properties of Concrete Made with Waste Foundry Sand

2013 ◽  
Vol 25 (4) ◽  
pp. 484-490 ◽  
Author(s):  
Gurdeep Kaur ◽  
Rafat Siddique ◽  
Anita Rajor
Keyword(s):  
Foundry Sand ◽  
Waste Foundry Sand
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