Removal of cadmium(II) ions from aqueous solution using Ni (15 wt.%)-doped α-Fe2O3 nanocrystals: equilibrium, thermodynamic, and kinetic studies

2015 ◽  
Vol 72 (4) ◽  
pp. 608-615 ◽  
Author(s):  
Mohamed OuldM'hamed ◽  
L. Khezami ◽  
Abdulrahman G. Alshammari ◽  
S. M. Ould-Mame ◽  
I. Ghiloufi ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Free Energy ◽  
Thermodynamic Parameters ◽  
Adsorption Process ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Kinetic Studies ◽  
Entropy Change ◽  
Batch Mode ◽  
Toxic Heavy Metal

The present publication investigates the performance of nanocrystalline Ni (15 wt.%)-doped α-Fe2O3 as an effective nanomaterial for the removal of Cd(II) ions from aqueous solutions. The nanocrystalline Ni-doped α-Fe2O3 powders were prepared by mechanical alloying, and characterized by X-ray diffraction and a vibrating sample magnetometer. Batch-mode experiments were realized to determine the adsorption equilibrium, kinetics, and thermodynamic parameters of toxic heavy metal ions by Ni (15 wt.%)-doped α-Fe2O3. The adsorption isotherms data were found to be in good agreement with the Langmuir model. The adsorption capacity of Cd(II) ion reached a maximum value of about 90.91 mg g−1 at 328 K and pH 7. The adsorption process kinetics was found to comply with pseudo-second-order rate law. Thermodynamic parameters related to the adsorption reaction, free energy change, enthalpy change and entropy change, were evaluated. The found values of free energy and enthalpy revealed a spontaneous endothermic adsorption-process. Moreover, the positive entropy suggests an increase of randomness during the process of heavy metal removal at the adsorbent–solution interface.

scholarly journals Heavy metal removal from wastewater using various adsorbents: a review

2016 ◽  
Vol 7 (4) ◽  
pp. 387-419 ◽  
Author(s):  
Renu ◽  
Madhu Agarwal ◽  
K. Singh
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Aquatic Ecosystems ◽  
Adsorption Process ◽  
Metal Removal ◽  
Low Cost ◽  
Heavy Metal Removal ◽  
Review Article ◽  
Removal Capacity ◽  
Removal Of Heavy Metals

Heavy metals are discharged into water from various industries. They can be toxic or carcinogenic in nature and can cause severe problems for humans and aquatic ecosystems. Thus, the removal of heavy metals from wastewater is a serious problem. The adsorption process is widely used for the removal of heavy metals from wastewater because of its low cost, availability and eco-friendly nature. Both commercial adsorbents and bioadsorbents are used for the removal of heavy metals from wastewater, with high removal capacity. This review article aims to compile scattered information on the different adsorbents that are used for heavy metal removal and to provide information on the commercially available and natural bioadsorbents used for removal of chromium, cadmium and copper, in particular.

scholarly journals STUDY ON SYNTHESIS OF MnFe2O4/GNPs COMPOSITE AND APPLICATION ON HEAVY METAL REMOVAL

2018 ◽  
Vol 56 (1A) ◽  
pp. 204
Author(s):  
Nguyen Duy Anh
Keyword(s):  
Heavy Metal ◽  
Metal Oxide ◽  
Metal Removal ◽  
Metal Oxide Nanoparticles ◽  
Heavy Metal Removal ◽  
Absorption Capacity ◽  
Mixed Metal Oxide ◽  
Oxide Nanoparticles ◽  
Toxic Heavy Metal ◽  
Mixed Metal

Nowadays, composite materials between mixed-metal oxides and graphene are widely studied due to their multiple applications on different fields. MnFe2O4 is a magnetic material which has the ability to absorb toxic heavy metal in water. Graphene nanoplatelets (GNPs) with about 10 layers, is one of type of graphene. GNPs was used as matrix for the fine distribution of metal oxide nanoparticles. Surface area for the absorption process can be increased. Composite was synthesized using solvothermal method, in which mixed-metal oxide nanoparticles were directly formed in-situ from precursor salts onto GNPs surface. Synthesized material was analyzed using XRD, SEM and EDX methods to determine its properties. Heavy metal absorption capacity was also studied and showed good results.

scholarly journals Graphene-Based Microbots for Toxic Heavy Metal Removal and Recovery from Water

Nano Letters ◽  
2016 ◽  
Vol 16 (4) ◽  
pp. 2860-2866 ◽  
Author(s):  
Diana Vilela ◽  
Jemish Parmar ◽  
Yongfei Zeng ◽  
Yanli Zhao ◽  
Samuel Sánchez
Keyword(s):  
Heavy Metal ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Toxic Heavy Metal ◽  
Removal And Recovery

scholarly journals Removal of Pb(II), Fe(II) and Zn(II) using activated carbon produced from foxtail palm fruit chemically activated by KOH and H3PO4.

2019 ◽  
Vol 7 (1) ◽  
pp. 19-22
Author(s):  
Nur Sabiha Sairan ◽  
Noor Syuhadah Subki ◽  
Nik Raihan Nik Yusoff
Keyword(s):  
Heavy Metal ◽  
Activated Carbon ◽  
Phosphoric Acid ◽  
Potassium Hydroxide ◽  
Adsorption Process ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Sorption Process ◽  
Palm Fruit ◽  
Main Factor

The increasing rate of urbanization and continuous developments are the main factor which led to heavy metals contamination into the environment especially in the water bodies. However, the contamination of heavy metal can be treated using adsorption process using activated carbon. Thus, this study was based on using powdered activated carbon, which prepared from foxtail palm fruit and chemically activated using potassium hydroxide and phosphoric acid. The main parameters such as effect of chemical activating agent, effect of initial concentration of heavy metal and effect of sorbent dosage that influenced the sorption process were studied. From the result, activated carbon that was chemically activated by phosphoric acid shown the best removal compared to activated carbon that was chemically activated by potassium hydroxide. The percentage removal of Pb(II), Fe(II) and Zn(II) were 95.8%, 99.9% and 22.8% respectively using 0.5 g of activate carbon. The result indicates that the adsorption process using activated carbon that produced from plant can be applied for heavy metal removal from aqueous solution.

Sonosynthesis of Iron-Supported Clay for Heavy Metal Removal via Sonoassisted Adsorption Process

2020 ◽  
Vol 45 (9) ◽  
pp. 7645-7654
Author(s):  
Nesrine Dammak ◽  
Haithem Bel Hadjltaief ◽  
Wiem Hamza ◽  
Mourad Benzina
Keyword(s):  
Heavy Metal ◽  
Adsorption Process ◽  
Metal Removal ◽  
Heavy Metal Removal

Removal of Cadmium Ions from Aqueous Solutions Using Acid-Activated Cockle Shell Powder

2020 ◽  
Vol 987 ◽  
pp. 129-134
Author(s):  
Tuan Anh Nguyen ◽  
Tan Phat Le ◽  
Thanh Khoa Phung
Keyword(s):  
Heavy Metal ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Ion Concentration ◽  
Quadratic Model ◽  
Marine Bivalve ◽  
Cadmium Ion ◽  
Batch Mode ◽  
Ion Removal ◽  
Cockle Shell

In Vietnam, heavy metal removal from aqueous solution has been the subject of great attention in the last few years. There are several methods have been developed to reduce heavy metal pollution problems and adsorption technique has been widely used due to the versatility and effectiveness. Cockles are marine bivalve mollusks, whose shell are discharged as wastes by many marine product manufacturers and restaurants. Cockle shell can be economically used as adsorbent for the wastewater treatment. In this study, acid-activated cockle shell was used as an adsorbent material for divalent cadmium ion removal from waste water. The experiments in this work used batch mode adsorption. Experiments were designed by response surface methodology (RSM) and a quadratic model was used to predict the removal efficiency of cadmium. The input to the model was varied as initial cadmium ion concentration from 600 to 1000 mg/L, contact time from 30 to 90 minutes, adsorbent dosage from 0.5 g/L to 1.5 g/L. Analysis of variance was incorporated to judge the adequacy of the models. The predictions of the model were in good agreement with experimental results and the optimal condition is then estimated from the model. Other properties of obtained materials were also investigated using XRD, BET, TGA, SEM analysis methods. The results show that the simple acid-activated cockle shell can be used as a low cost and effective adsorbent for cadmium ion removal.

An Alternative Approach of Toxic Heavy Metal Removal by Arthrobacter phenanthrenivorans:Assessment of Surfactant Production and Oxidative Stress

2016 ◽  
Vol 110 (11) ◽  
pp. 2124 ◽  
Author(s):  
Goutam Banerjee ◽  
Arun Kumar Ray ◽  
Shubhant Pandey ◽  
Ravi Kumar
Keyword(s):  
Oxidative Stress ◽  
Heavy Metal ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Toxic Heavy Metal ◽  
Alternative Approach ◽  
Surfactant Production ◽  
And Oxidative Stress
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