scholarly journals Cadmium Removal by using Pumice Modified with Iron Nanoparticles from Aqueous Solutions

2016 ◽  
Vol 18 (2) ◽  
pp. 426-436 ◽  
Keyword(s):  
Contact Time ◽  
Iron Nanoparticles ◽  
Cadmium Concentration ◽  
Synthetic Wastewater ◽  
Isotherm Models ◽  
Cadmium Removal ◽  
Pumice Stone ◽  
Practical Applications ◽  
Equilibrium Data ◽  
Adsorbent Dose

<p>In this study, the removal of cadmium by using pumice coated with iron nanoparticles (INPs) from synthetic wastewater was investigated. The effects of parameters influencing adsorption: contact time (10-20 min), pH (3-9), initial cadmium concentration (25-125 mg l<sup>-1</sup>) and adsorbent dose (2-10 g l<sup>-1</sup>) were studied. The pumice stone used in this research was, first, crashed and then sieved with 20 mesh standard sieves (0.85 mm); finally, it was coated with INPs. An atomic absorption spectrophotometer was used to measure cadmium contents and isotherm models and adsorption kinetics were studied. The results showed the adsorption process of cadmium reached equilibrium at contact time of 80 min. With increasing pH solution, the efficiency enhanced which peaked at pH 7-8. Cadmium concentration increase resulted in a decrease in efficiency, whereas adsorbent dose increase improved it. Equilibrium data of adsorption followed isotherms models: Langmuir and Freundlich. The highest removal efficiency and adsorption capacity were, respectively, 83% and 17.27 mg g<sup>-1</sup>. Furthermore, absorption kinetics is better described by the pseudo second-order model. According to the results obtained, pumice coated with INPs is an effective adsorbent and can be introduced as a suitable option in practical applications</p>

Cadmium Removal from Synthetic Wastewater using Seed Biomass Biosorbent: A Bench-top Reactor Investigation

2021 ◽  
Author(s):  
Deen Dayal Giri ◽  
Jay Mant Jha ◽  
Neha Srivast ◽  
Dan Bahadur Pal
Keyword(s):  
Cadmium Concentration ◽  
Ion Concentration ◽  
Synthetic Wastewater ◽  
Maximum Adsorption Capacity ◽  
Cadmium Removal ◽  
Solution Ph ◽  
Optimization Study ◽  
Seed Biomass ◽  
Optimal Set ◽  
Adsorbent Dose

Abstract The cadmium ion concentration in drinking water is frequently found higher in different part of the world as per international recommendation. It is crucial to reduce concentration in water by sustainable and environmentally friendly means. We tested the biomass of Jamun (JP) and Amaltash (AT) seeds to remove cadmium from synthetic wastewater cost effectively. The biomasses were characterized by functional groups (FTIR), crystalline structures (XRD), and elemental analysis (ICP) techniques. Experimentation the optimization study has been carried out by using Design-software 6.0.8. Response surface methodology has been applied to design the experiments where we have used three factors and three levels Box-Behnken design (BBD). Cadmium removal ability of bio-sorbents were evaluated in bench-top reactor and optimized at various solution pH, adsorbent dose, and cadmium concentration in synthetic wastewater. At initial cadmium concentration 2 mg/litre, pH 6, adsorbent dose 60 mg and stirring speed 300 rpm the cadmium removal was ~95% and ~93% from synthetic wastewater by JP and AT seed biomass, respectively. The adsorption behaviour of cadmium ions well explained following Temkin model (AT r2=0.988; JP r2=0.984) and maximum adsorption capacity 3.88 mg g−1 (JP) and 4.54 mg g−1 (AT) after 70 minutes under optimal set of condition and proved to be an efficient and eco-friendly bio-sorbent for cadmium removal.

scholarly journals Removal of cadmium from aqueous solutions using excised leaves of Quetta pine (Pinus halepensis Mill.)

2015 ◽  
Vol 43 (3) ◽  
pp. 277-281 ◽  
Author(s):  
M Rahman ◽  
S Gul ◽  
M Ajmal ◽  
A Iqbal ◽  
Akk Achakzai
Keyword(s):  
Aqueous Solution ◽  
Contact Time ◽  
Pinus Halepensis ◽  
Freundlich Isotherm ◽  
Batch Adsorption ◽  
Adsorption Efficiency ◽  
Cadmium Removal ◽  
Optimum Ph ◽  
Maximum Contact ◽  
Adsorbent Dose

Removal of cadmium from aqueous solution was studied by using Quetta pine (Pinus halepensis Mill.) leaves. Batch adsorption experiments were performed as a function of appropriate equilibrium time, pH, concentration of adsorbate and amount of adsorbent. The optimum pH required for maximum adsorption was found to be 7.0 and the maximum contact time for the equilibrium was 30 minutes at adsorbent dose of 10 g. The maximum adsorption efficiency of cadmium removal was 98.50%. The results were better fitted by Langmuir than Freundlich isotherm. The separation factor of equilibrium 0.12 and 0.67 showed that Quetta pine leaves are good adsorbent of cadmium from aqueous solution DOI: http://dx.doi.org/10.3329/bjb.v43i3.21598 Bangladesh J. Bot. 43(3): 277-281, 2014 (December)

scholarly journals Equilibrium, Kinetics, and Thermodynamics of the Removal of Nickel(II) from Aqueous Solution Using Cow Hooves

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
I. Osasona ◽  
O. O. Ajayi ◽  
A. O. Adebayo
Keyword(s):  
Aqueous Solution ◽  
Contact Time ◽  
Room Temperature ◽  
Physical Adsorption ◽  
Low Cost ◽  
Freundlich Isotherm ◽  
Isotherm Models ◽  
Order Kinetic ◽  
Equilibrium Studies ◽  
Equilibrium Data

The feasibility of using powdered cow hooves (CH) for removing Ni2+ from aqueous solution was investigated through batch studies. The study was conducted to determine the effect of pH, adsorbent dosage, contact time, adsorbent particle size, and temperature on the adsorption capacity of CH. Equilibrium studies were conducted using initial concentration of Ni2+ ranging from 15 to 100 mgL−1 at 208, 308, and 318 K, respectively. The results of our investigation at room temperature indicated that maximum adsorption of Ni2+ occurred at pH 7 and contact time of 20 minutes. The thermodynamics of the adsorption of Ni2+ onto CH showed that the process was spontaneous and endothermic. Langmuir, Freundlich, and Dubinin-Radushkevich (D-R) isotherm models were used to quantitatively analysed the equilibrium data. The equilibrium data were best fitted by Freundlich isotherm model, while the adsorption kinetics was well described by pseudo-second-order kinetic equation. The mean adsorption energy obtained from the D-R isotherm revealed that the adsorption process was dominated by physical adsorption. Powdered cow hooves could be utilized as a low-cost adsorbent at room temperature under the conditions of pH 7 and a contact time of 20 minutes for the removal of Ni(II) from aqueous solution.

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.

scholarly journals Chemical and physical preparation of activated carbon using Raw bagasse for cationic dye adsorption

2016 ◽  
Vol 18 (2) ◽  
pp. 402-415 ◽  
Keyword(s):  
Activated Carbon ◽  
Sugarcane Bagasse ◽  
Contact Time ◽  
Dye Adsorption ◽  
Isotherm Models ◽  
Adsorptive Capacity ◽  
Adsorption Isotherm Models ◽  
Equilibrium Data ◽  
Agriculture Wastes ◽  
Physical Preparation

<div> <p>Agriculture wastes like sugarcane bagasse are available in large quantities in Egypt. Various adsorbents from natural materials, industrial waste materials, agricultural by-products, and biomass based activated carbon can be used in the removal of various dyes. Raw Bagasse pith (RBP) was used to prepare activated carbon (AC) using phosphoric acid (H<sub>3</sub>PO<sub>4</sub>) as a chemical activating agent. C The raw BP and the synthesized adsorbent were characterized by Fourier transform infrared (FTIR) spectroscopy and scanning electron microscope (SEM). The effectiveness of AC prepared in adsorption of methylene blue (MB) has been studied as a function of adsorbent type, initial dye concentration and contact time. The effects of the initial dye concentration and contact time were evaluated. Adsorption isotherm models - Langmuir, Freundlich and Temkin were used to simulate the equilibrium data. Langmuir equation was found to have the highest value of R<sup>2</sup> compared with other models. Furthermore, it was found that sugarcane bagasse have a high adsorptive capacity towards MB.</p> </div> <p>&nbsp;</p>

The Adsorption of Cd(II) Ions on Sodium Hydroxide-Treated Bamboo Powder

2011 ◽  
Vol 695 ◽  
pp. 73-76 ◽  
Author(s):  
An Kai Luo ◽  
Xue Gang Luo ◽  
Xiao Yan Lin
Keyword(s):  
Sodium Hydroxide ◽  
Adsorption Process ◽  
Cadmium Concentration ◽  
Freundlich Isotherm ◽  
Isotherm Models ◽  
Batch Adsorption ◽  
Maximum Adsorption Capacity ◽  
Equilibrium Data ◽  
Bamboo Powder ◽  
System Characteristics

The adsorption of Cd(II) ions from aqueous solution by sodium hydroxide-treated bamboo powder（STB） was studied in a batch adsorption system. Characteristics of STB were investigated by scanning electron microscopy (SEM) and electron dispersive spectroscopy (EDS). Factors influencing adsorption such as pH of the solution, adsorbent dosage, cadmium concentration and temperature have been studied. The adsorption process was relatively fast and equilibrium was achieved after 120 min, and the maximum adsorption of Cd(II) ions occurred at around pH 6.5. The equilibrium data were fitted using Langmuir, Temkin and Freundlich isotherm models to calculate isotherm constants. And the adsorption isotherm fitted well Langmuir isotherm, and the maximum adsorption capacity was 8.987 mg/g.

scholarly journals Adsorptive Removal of Pb(II), Cu(II) and Cd(II) Ions onto Rubus ellipticus as Low-Cost Biosorbent

2020 ◽  
Vol 32 (3) ◽  
pp. 495-500
Author(s):  
Rajesh Kumar ◽  
Harish Sharma ◽  
M.C. Vishwakarma ◽  
S.K. Joshi ◽  
N.S. Bhandari ◽  
...  
Keyword(s):  
Contact Time ◽  
Metal Ion ◽  
Low Cost ◽  
Ion Concentration ◽  
Adsorption Efficiency ◽  
Adsorptive Removal ◽  
Langmuir Adsorption ◽  
Equilibrium Data ◽  
Rubus Ellipticus ◽  
Adsorbent Dose

In the present study, removal efficiency (%) of Rubus ellipticus leaves (REL) as an adsorbent for the removal of Pb(II), Cu(II) and Cd(II) ions was investigated. Different parameters i.e., pH, contact time, temperature, adsorbent dose and initial metal ion concentration were investigated to obtain the optimum adsorption efficiency. At pH 4, a maximum adsorption was 84.6, 80.2 and 74.5 % for Pb(II), Cu(II) and Cd(II) ions, respectively. The maximum adsorption of all the three metal ions obtained at contact time (75 min), initial metal ion concentration (10 mg/L), temperature (25 ºC) and adsorbent dose (5.0 g). The equilibrium adsorption of Pb(II), Cu(II) and Cd(II) ions at different temperature was described by Langmuir, Freundlich and Temkin isotherms. The equilibrium data fitted well the Langmuir adsorption isotherm. Thermodynamic parameters like Gibb′s free energy (ΔGº), enthalpy (ΔHº) and entropy (ΔSº) were also calculated. The calculated parameters indicated that adsorption of Pb(II), Cu(II) and Cd(II) ions onto Rubus ellipticus leaves (REL) was spontaneous (ΔGº < 0), endothermic (ΔGº > 0). The feasibility of the process was evident from the positive value of ΔSº.

scholarly journals Application of Chitosan/Alginate Nanocomposite Incorporated with Phycosynthesized Iron Nanoparticles for Efficient Remediation of Chromium

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2481
Author(s):  
Fahad M. Almutairi ◽  
Haddad A. El Rabey ◽  
Adel I. Alalawy ◽  
Alzahraa A. M. Salama ◽  
Ahmed A. Tayel ◽  
...  
Keyword(s):  
Contact Time ◽  
Iron Nanoparticles ◽  
High Efficiency ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Brown Seaweed ◽  
Ion Concentration ◽  
Batch Adsorption ◽  
Mean Diameter ◽  
Adsorbent Dose

Biopolymers and nanomaterials are ideal candidates for environmental remediation and heavy metal removal. As hexavalent chromium (Cr6+) is a hazardous toxic pollutant of water, this study innovatively aimed to synthesize nanopolymer composites and load them with phycosynthesized Fe nanoparticles for the full Cr6+ removal from aqueous solutions. The extraction of chitosan (Cht) from prawn shells and alginate (Alg) from brown seaweed (Sargassum linifolium) was achieved with standard characteristics. The tow biopolymers were combined and cross-linked (via microemulsion protocol) to generate nanoparticles from their composites (Cht/Alg NPs), which had a mean diameter of 311.2 nm and were negatively charged (−23.2 mV). The phycosynthesis of iron nanoparticles (Fe-NPs) was additionally attained using S. linifolium extract (SE), and the Fe-NPs had semispherical shapes with a 21.4 nm mean diameter. The conjugation of Cht/Alg NPs with SE-phycosynthesized Fe-NPs resulted in homogenous distribution and stabilization of metal NPs within the polymer nanocomposites. Both nanocomposites exhibited high efficiency as adsorbents for Cr6+ at diverse conditions (e.g., pH, adsorbent dose, contact time and initial ion concentration) using batch adsorption evaluation; the most effectual conditions for adsorption were a pH value of 5.0, adsorbent dose of 4 g/L, contact time of 210 min and initial Cr6+ concentration of 75 ppm. These factors could result in full removal of Cr6+ from batch experiments. The composited nanopolymers (Cht/Alg NPs) incorporated with SE-phycosynthesized Fe-NPs are strongly recommended for complete removal of Cr6+ from aqueous environments.

scholarly journals Adsorption of methyl blue with activated carbon derived from peanut shell

2019 ◽  
Author(s):  
Amit Nilabh
Keyword(s):  
Activated Carbon ◽  
Contact Time ◽  
Agricultural Waste ◽  
Chemical Activation ◽  
Methyl Blue ◽  
Isotherm Models ◽  
Maximum Adsorption Capacity ◽  
Peanut Shell ◽  
Adsorption Data ◽  
Adsorbent Dose

In this study we synthesized activated carbon (AC) sourced from peanut shell, an agricultural waste, for the adsorption of methyl blue from its aqueous solution. AC was produced via chemical activation method and was characterized using various tools like XRD, FESEM and Raman spectroscopy. Adsorption experiments were carried in different batches with varying initial concentration, adsorbent dose, contact time, pH and temperature. The optimized parameters for adsorption were found to be that of initial dye concentration of 150 mg/L, adsorbent dose of 120 mg/L, temperature equals to 50C, contact time of 50 minutes and pH equals to 8. Adsorption data were used to figure out isotherm models, kinetics as well as thermodynamics of the process. It was concluded that maximum adsorption capacity is coming to be 714.28 mg/g, and the adsorption is favoring the Tempkin isotherm model. Also it was observed that the process is endothermic and spontaneous in nature.

scholarly journals Adsorption of Phenol from Aqueous Solution using Paper Waste

2019 ◽  
Vol 20 (1) ◽  
pp. 23-29
Author(s):  
Huda Adil Sabbar
Keyword(s):  
Contact Time ◽  
Phenol Concentration ◽  
Phenol Removal ◽  
Adsorption Models ◽  
Freundlich Model ◽  
Paper Waste ◽  
Equilibrium Data ◽  
Initial Phenol Concentration ◽  
Recyclable Resources ◽  
Adsorbent Dose

The exploitation of obsolete recyclable resources including paper waste has the advantages of saving resources and environment protection. This study has been conducted to study utilizing paper waste to adsorb phenol which is one of the harmful organic compound byproducts deposited in the environment. The influence of different agitation methods, pH of the solution (3-11), initial phenol concentration (30-120ppm), adsorbent dose (0.5-2.5 g) and contact time (30-150 min) were studied. The highest phenol removal efficiency obtained was 86% with an adsorption capacity of 5.1 mg /g at optimization conditions (pH of 9, initial phenol concentration of 30 mg/L, an adsorbent dose of 2 g and contact time of 120min and at room temperature). The well-known Langmuir and Freundlich adsorption models were studied. The results show that the equilibrium data fitted to the Freundlich model with R2=0.9897 within the concentration range studied. The main objective of this study is finding the best mixing and conditions for phenol removal by adsorption via paper waste.

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