Use of Modified γ-Alumina Nanoparticles for the Extraction and Preconcentration of Trace Amounts of Cadmium Ions

2016 ◽  
Vol 69 (3) ◽  
pp. 314 ◽  
Author(s):  
Ali Mirabi ◽  
Ali Shokuhi Rad ◽  
Mohammad Reza Jamali ◽  
Nasim Danesh
Keyword(s):  
Ph Value ◽  
Sodium Dodecyl ◽  
Operating Conditions ◽  
Alumina Nanoparticles ◽  
Optimum Operating ◽  
Al2o3 Nanoparticles ◽  
Cadmium Ion ◽  
Cadmium Ions ◽  
Relative Standard ◽  
Separation And Preconcentration

We used γ-Al2O3 nanoparticles coated with sodium dodecyl sulfate–4-(2-pyridylazo)resorcinol (SDS–PAR) as an innovative sorbent for the extraction and preconcentration of trace amounts of cadmium cations. The properties of the prepared sorbent were examined by scanning electron microscopy. The effects of different parameters towards the separation and preconcentration of trace amounts of cadmium ions, such as the quantity of sorbent, the pH value, and choice of solvent for recovery of the sorbent, were investigated. Under optimum operating conditions, a cadmium ion enrichment factor of 20 was obtained using 10.0 mL of sample. The detection limit of this method for CdII cations was 0.2 ng mL–1 (n = 7) within a linear range of 0.6–340 ng mL–1 and a relative standard deviation of 1.8 % (n = 10). The method was effectively applied to the analysis of cadmium ions in food and herbal and water samples.

scholarly journals Solid phase extraction of trace amounts of cadmium(II) ions in water and food samples using iron magnetite nanoparticles modified by sodium dodecyl sulfate and 2-mercaptobenzothiazole

2017 ◽  
Vol 75 (6) ◽  
pp. 1440-1446
Author(s):  
Shahriar Abbasi ◽  
Mehdi ShanbehDehbalai ◽  
Hossein Khani
Keyword(s):  
Sodium Dodecyl Sulfate ◽  
Solid Phase Extraction ◽  
Magnetite Nanoparticles ◽  
Solid Phase ◽  
Sodium Dodecyl ◽  
Food Samples ◽  
Phase Extraction ◽  
Cadmium Ions ◽  
Relative Standard ◽  
Dodecyl Sulfate

A new, simple and rapid method for solid phase extraction and preconcentration of trace amounts of cadmium ions using 2-mercaptobenzothiazole/sodium dodecyl sulfate immobilized on magnetite nanoparticles (MBT-SDS-MNPs) was proposed. The method is based on the extraction of cadmium ions via complexation with MBT immobilized on SDS-coated MNPs and their determination by flame atomic absorption spectrometry. The effects of different parameters – pH; eluent type, concentration and volume; amounts of salt and adsorbent; contact time and interfering ions – on the adsorption of cadmium ions were studied. Under optimized conditions, the calibration curve was linear in the range of 10–5,000 μg L−1. Detection limit and relative standard deviation of the proposed method were 0.009 μg L−1 and 2.2%, respectively. The adsorption data were analyzed by Langmuir and Freundlich isotherm models and a maximum adsorption amount of 24.80 mg g−1, a Langmuir adsorption equilibrium constant (b) of 4.62 and Freundlich constants Kf and n of 6.075 mg1–1/n L1/n g−1 and 2.391, respectively, were obtained. Finally, this adsorbent was successfully used for extraction of cadmium from water and food samples.

Adsorption of fluoride from aqueous solution by enhanced chitosan/bentonite composite

2013 ◽  
Vol 68 (9) ◽  
pp. 2074-2081 ◽  
Author(s):  
Qian Liu ◽  
Ruihua Huang ◽  
Bingchao Yang ◽  
Yanping Liu
Keyword(s):  
Aqueous Solution ◽  
Ph Value ◽  
Fluoride Concentration ◽  
Operating Conditions ◽  
Optimum Operating ◽  
Fluoride Removal ◽  
Fluoride Ions ◽  
Adsorbent Dosage ◽  
Batch System ◽  
Monolayer Adsorption

In this work, enhanced chitosan/bentonite composite was prepared by treating chitosan/bentonite composite with concentrated hydrochloric acid (HCl). The adsorption of fluoride ions from aqueous solution onto the enhanced chitosan/bentonite composite was investigated. Adsorption studies were performed in a batch system, and the effects of various parameters, such as the pH value of the solution, adsorbent dosage and initial fluoride concentration, were evaluated. The optimum operating conditions for fluoride removal by the enhanced chitosan/bentonite composite were pH = 7 or so, and adsorbent dosage =1.2 g. Increasing initial fluoride concentration reduced the adsorption of fluoride onto the enhanced chitosan/bentonite composite. Furthermore, the presence of other co-anions weakened the adsorption of fluoride onto this adsorbent. The equilibrium adsorption isotherms were well described by both the Freundlich and Langmuir models. The maximum monolayer adsorption capacity was 2.95 mg/g at 293 K.

scholarly journals Removal of aniline from aqueous solutions by activated carbon coated by chitosan

2015 ◽  
Vol 5 (4) ◽  
pp. 610-618 ◽  
Author(s):  
Qian Liu ◽  
Lujie Zhang ◽  
Pan Hu ◽  
Ruihua Huang
Keyword(s):  
Activated Carbon ◽  
Aqueous Solutions ◽  
Ph Value ◽  
Operating Conditions ◽  
Optimum Operating ◽  
Order Kinetic ◽  
Factors Affecting ◽  
Adsorbent Dosage ◽  
Wide Range ◽  
Carbon Coated

In this work, activated carbon (AC) coated by chitosan was synthesized and characterized by Fourier transform infrared spectrophotometer and scanning electron microscope (SEM) techniques. The removal of aniline from aqueous solutions by AC coated by chitosan was investigated. The factors affecting the adsorption of aniline onto AC coated by chitosan, including the ratio of AC to chitosan, adsorbent dosage, pH value of solution, initial aniline concentration, and contact time were evaluated. These results showed that the optimum operating conditions were: the ratio of AC to chitosan = 0.5, adsorbent dosage = 0.2 g, and the adsorption of aniline from aqueous solutions had better removal in the concentration range of 20–50 mg/L. This adsorbent allowed high removal toward aniline in a wide range of pH. The equilibrium time was 100 minutes. The Freundlich model exhibited better correlation of the equilibrium adsorption data. The pseudo-second-order kinetic equation could better describe the kinetic behavior of aniline adsorption.

Adsorption of As (v) from Water by Activated Aluminum Oxide

2012 ◽  
Vol 476-478 ◽  
pp. 1965-1968
Author(s):  
Da Lei Zhang ◽  
Fan Qiao ◽  
Mou Lv ◽  
Ying Jie Sun ◽  
Qing Yuan Guo
Keyword(s):  
Aluminum Oxide ◽  
Adsorption Equilibrium ◽  
Ph Value ◽  
Adsorption Properties ◽  
Operating Conditions ◽  
Optimum Operating ◽  
Ph Values ◽  
Initial Ph ◽  
Langmuir Isotherm Model ◽  
Activated Aluminum Oxide

In this paper the adsorption properties of activated aluminum oxide (AAO ) to As(V) were researched. The effect of operating factors such as pH, contact time and initial As(V) concentration was investigated and the optimum operating conditions were established. Experimental results indicated that the optimal pH value adsorption of As(V)by activated aluminum oxide was from 4 to 6, and the optimum initial pH values was 5.5.The adsorption equilibrium was achieved within 5h.The adsorption capacity for As(V)increased with increasing concentration and the adsorption date was well fit by the Langmuir isotherm model. It is believed that activated aluminum oxide (AAO) is environmentally acceptable and industrially application for utilization in arsenic-containing wastewater treatment.

Study on the Experiment of Adsorption Cadmium (II) with Insoluble Starch Xanthate

2011 ◽  
Vol 413 ◽  
pp. 34-37
Author(s):  
Xiu Ling Song ◽  
Hui Qian
Keyword(s):  
Waste Water ◽  
Adsorption Mechanism ◽  
Ph Value ◽  
Removal Rate ◽  
Potato Starch ◽  
Influence Factors ◽  
Cadmium Ion ◽  
Cadmium Ions ◽  
New Treatment ◽  
Made In

Insoluble starch xanthate (ISX) is made with the potato starch and can be used for the treatment of cadmium-containing waste water. The performance of treatment and the influence factors with ISX made in this experiment are studied in this paper. It is shown that the removal rate of cadmium ion in wastewater can reach over 96%, when pH value of reaction liquid is 8.0, the adsorption time is 0.5h, and the concentration of cadmium ions in waste water is 30 mg·L-1.The adsorption mechanism was also discussed. It is shown that ISX promises to be a new treatment adsorbent to wastewater containing the low concentration cadmium. There are some merits with ISX: the smaller recruitment; better processing effect and so on. It is with chemical adsorption that wastewater containing cadmium is treated by insoluble starch xanthate.

Adsorption Kinetics and Isotherms Study of Cadmium Ions from Aqueous Solution on Tailings of Steel Slag

2012 ◽  
Vol 599 ◽  
pp. 602-607 ◽  
Author(s):  
Yong Wei Hui ◽  
Li Chao An
Keyword(s):  
Adsorption Kinetics ◽  
Ph Value ◽  
Removal Rate ◽  
Steel Slag ◽  
Langmuir Model ◽  
Operating Conditions ◽  
Kinetics Equation ◽  
Cadmium Ions ◽  
Pseudo Second Order ◽  
Kinetics And Isotherms

This article explores the operating conditions of the removal of cadmium ions from wastewater by tailings of steel slag and investigates the effect of stirring rate, initial concentration of cadmium, particle size of tailings and pH value of aqueous on removal efficiency. The results show that: under proper conditions, the removal rate of cadmium ions from water on tailings of steel slag can be up to above 99.9%. The adsorption kinetics follows the pseudo-second-order kinetics equation and the adsorption isotherm conforms to the Langmuir model.

Preconcentration and determination of ranitidine hydrochloride in real samples by using modified magnetic iron oxide nanoparticles

2016 ◽  
Vol 94 (1) ◽  
pp. 9-14 ◽  
Author(s):  
Elaheh Konoz ◽  
Amir H.M. Sarrafi ◽  
Hamed Sahebi
Keyword(s):  
Human Plasma ◽  
Ph Value ◽  
Limit Of Detection ◽  
Solid Phase ◽  
High Surface ◽  
Sodium Dodecyl ◽  
Magnetic Iron Oxide Nanoparticles ◽  
Ranitidine Hydrochloride ◽  
Relative Standard

This method shows a novel, fast, and simple magnetic solid-phase extraction (SPE) and spectrophotometric procedure for preconcentration and determination of ranitidine hydrochloride in human plasma and aquatic samples by using Fe3O4 nanoparticles (NPs) modified by sodium dodecyl sulfate (SDS) as an extractor. The unique properties of Fe3O4 NPs including high surface area and strong magnetism were utilized effectively in the magnetic SPE process. The determination method is based on the SDS-coated Fe3O4 NPs with extracted ranitidine-HCl, which was subsequently monitored spectrophotometrically at λmax = 320 nm. Effects of different parameters influencing the extraction efficiency of ranitidine-HCl including the pH value, amount of SDS, and Fe3O4 NPs, extraction time, desorption solvent, desorption time, and sample volume were optimized. Under optimized conditions, the method was successfully applied to the extraction of ranitidine-HCl from human plasma and aquatic samples. The extraction recovery in human plasma and different matrixes of waters were investigated and values of 89.0%–103.4% were obtained. The calibration graph for the determination of ranitidine-HCl was linear in the range of 0.025–1.50 μg mL−1 with R2 = 0.9946. The limit of detection of the proposed method was 7.5 × 10−3 μg mL−1. The repeatability and reproducibility (relative standard deviation) of the mentioned method were 0.83% and 1.22%, respectively. The experimental results showed that the proposed method was feasible for the analysis of ranitidine-HCl in environmental and biological samples.

A Study that Optimizate Reactive Brilliant Orange X-GN of CuO-CeO2/γ-Al2O3 under Oxidizing Conditions Based on Response Surface Methodology

2014 ◽  
Vol 955-959 ◽  
pp. 3-6
Author(s):  
Fu Chen Ban ◽  
Ya Ling Jiang ◽  
Xiao Tong Zhao ◽  
Xue Han
Keyword(s):  
Response Surface ◽  
Ph Value ◽  
Cell Voltage ◽  
Operating Conditions ◽  
Optimum Operating ◽  
Optimization Analysis ◽  
Box Behnken Design ◽  
Decolorization Rate ◽  
Response Surface Optimization ◽  
The Impact

To determine the reactive brilliant orange X-GN by CuO-CeO2/γ-Al2O3 optimum operating conditions.Under oxidizing conditions by CuO-CeO2/γ-Al2O3 that based on Box-Behnken Design,s response surface optimization analysis and establish model.The optimum operating conditions for cell voltage is 17.84V, pH is 7.0 ,concentration of electrolyte dosing is 966mg/L.Under this condition, the decolorization rate up to 95.5%,the impact of various factors on the size of decolorization rate is cell voltage>pH > concentration of electrolyte dosing ;the impact of the interaction between the factors various factors on the size of decolorization rate is cell voltage & pH value> cell voltage & concentration of electrolyte dosing>pH value & concentration of electrolyte dosing .

Green Dispersive Micro Solid-Phase Extraction using Multiwalled Carbon Nanotubes for Preconcentration and Determination of Cadmium and Lead in Food, Water, and Tobacco Samples

2020 ◽  
Vol 16 (4) ◽  
pp. 381-392
Author(s):  
Ayman A. Gouda ◽  
Ali H. Amin ◽  
Ibrahim S. Ali ◽  
Zakia Al Malah
Keyword(s):  
Carbon Nanotubes ◽  
Solid Phase Extraction ◽  
Multiwalled Carbon Nanotubes ◽  
Solid Phase ◽  
Certified Reference Materials ◽  
Phase Extraction ◽  
Multiwalled Carbon ◽  
Flame Atomic Absorption ◽  
Relative Standard ◽  
Separation And Preconcentration

Background: Cadmium (Cd2+) and lead (Pb2+) have acute and chronic effects on humans and other living organisms. In the present work, new, green and accurate dispersive micro solid-phase extraction (DμSPE) method for the separation and preconcentration of trace amounts of cadmium (Cd2+) and lead (Pb2+) ions in various food, water and tobacco samples collected from Saudi Arabia prior to its Flame Atomic Absorption Spectrometric (FAAS) determinations was developed. Methods: The proposed method was based on a combination of oxidized multiwalled carbon nanotubes (O-MWCNTs) with a new chelating agent 5-benzyl-4-[4-methoxybenzylideneamino)-4H- 1,2,4-triazole-3-thiol (BMBATT) to enrich and separate trace levels of Cd2+ and Pb2+. The effect of separation parameters was investigated. The validation of the proposed preconcentration procedure was performed using certified reference materials. Results: Analyte recovery values ranged from 95-102%, indicating that the method is highly accurate. Furthermore, precision was demonstrated by the relative standard deviation (RSD < 3.0%). The limits of detection were 0.08 and 0.1 μg L−1 for Cd2+ and Pb2+ ions, respectively. The preconcentration factor was 200. Conclusion: The proposed method was used for the estimation of Cd2+ and Pb2+ ion content in various real samples, and satisfactory results were obtained. The proposed method has high adsorption capacity, rapid adsorption equilibrium, extremely low LODs, high preconcentration factors and shortens the time of sample preparation in comparison to classical SPE.

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