Competitive adsorption of copper and lead ions on an iron-coated sand from water

2000 ◽  
Vol 42 (3-4) ◽  
pp. 149-154 ◽  
Author(s):  
C.H. Lai ◽  
C.Y. Chen ◽  
P.H. Shih ◽  
T.H. Hsia
Keyword(s):  
Iron Oxide ◽  
Metal Ions ◽  
Competitive Adsorption ◽  
Copper Ions ◽  
Column Experiment ◽  
Continuous Treatment ◽  
Lead Ions ◽  
Treatment Unit ◽  
Sand Surface ◽  
Coated Sand

Iron oxides are good adsorbents for some metal ions. However, the adsorbent properties of these oxides are not fully exploited in water or wastewater operations because of difficulties associated with their separation from the aqueous phase. An oven process with agitators for applying an iron oxide coating onto the sand surface to utilize the adsorbent properties of the coating and filtration properties of the sand media was developed. The competitive adsorption of iron-coated sand for copper and lead ions from water was investigated by batch and column experiments. Among the two metal ions studied, the coated sand has greater affinity for the removal of lead ions compared to copper ions at a concentration of 5×0-5M, 1×10-4M and an interval of pH=2.5∼6.5. Adsorption behaviors of copper and lead ions at the iron oxide/water interface could be proved to form chemisorption through the SEM/EDAX analysis. From the column experiment results, both copper and lead ions could be removed simultaneously by the iron-coated sand in a continuous treatment unit.

Evaluating an iron-coated sand for removing copper from water

1994 ◽  
Vol 30 (9) ◽  
pp. 175-182 ◽  
Author(s):  
C. H. Lai ◽  
S. L. Lo ◽  
C. F. Lin
Keyword(s):  
Iron Oxide ◽  
Copper Ions ◽  
Packed Column ◽  
Drinking Water Treatment ◽  
Heating Process ◽  
Order Kinetic ◽  
Sand Surface ◽  
Adsorption Equation ◽  
The Media ◽  
Coated Sand

In drinking water treatment systems, the conventional process (coagulation, sedimentation and filtration units) cannot remove trace metals efficiently. Iron oxide is an excellent, regenerable adsorbent, and often controls free metals through adsorption. The utilization of heating process for coating iron oxide on sand surface allowed the media to be used in a packed column. The adsorbent media were investigated for removing copper ions from water using both batch and column experimental methods. A one-dimensional convective-dispersive transport model with a combination of second-order kinetic adsorption equation was adopted for predicting copper retention in a 80 cm depth filter bed. The concentration of copper ions in influent ranged from 0.64 to 3.2 mg/l. The experimental results indicated that the copper could be removed completely until the breakpoint. Once breakthrough occurred, the regeneration of the media could be achieved by soaking with acid solution (pH = 3.0). The simulation results of the transport-adsorption equation fit experimental data quite well. Consequently, the coated sand can be applied for the conventional rapid filtration process to remove copper ions from water.

scholarly journals Permeable Reactive Barrier of Coated Sand by Iron Oxide for Treatment of Groundwater Contaminated with Cadmium and Copper Ions

2020 ◽  
Vol 16 (2) ◽  
pp. 47-55
Author(s):  
Mohammed B. Abdul-Kareem ◽  
Ayad A.H. Faisal
Keyword(s):  
Iron Oxide ◽  
Copper Ions ◽  
Permeable Reactive Barrier ◽  
Nano Particles ◽  
Maximum Adsorption Capacity ◽  
Sorption Data ◽  
Reactive Barrier ◽  
Good Ability ◽  
Langmuir Isotherm Model ◽  
Coated Sand

In this research, coated  sand  iron-oxide (CSIO)  has been used as a permeable reactive barrier (PRB) for removal of cadmium and copper  ions from the contaminated groundwater. The prepared material has been  manufactured by precipitation of nano-particles based this oxide type on the sand surfaces by impregnation process. Therefore, this technique can be considered the main objective of the present study. The description of sorption data for sorbate-sorbent under consideration by the Langmuir isotherm model was more valuable than the Freundlich model. The maximum adsorption capacity of CSIO reaches 1.9181 and 7.6425 mg/g for cadmium and copper respectively. COMSOL Multiphysics Version release 3.5 has a good ability in the simulation and prediction of the cadmium and copper transport through one-dimensional CSIO-PRB. The outcome of this investigation prove that the manufactured CSIO has significant capability in the delay of contaminants the migration through barrier packed with this material. The root means squared errors between predicted and measured data were not exceeded the 0.121; so, this means that there a good agreement between these data

Removal of copper ions from wastewater via adsorption on modified hematite (α-Fe2O3) iron oxide coated sand

2021 ◽  
pp. 128687
Author(s):  
Junaid Khan ◽  
Lin Shanshan ◽  
Nizeyimana Jean Claude ◽  
Yifeng Wu ◽  
Qi Wang ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Copper Ions ◽  
Coated Sand

scholarly journals An Investigation on Design and Characterization of a Highly Selective LED Optical Sensor for Copper Ions in Aqueous Solutions

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1099
Author(s):  
Sheng-Chun Hung ◽  
Chih-Cheng Lu ◽  
Yu-Ting Wu
Keyword(s):  
Aqueous Solutions ◽  
Metal Ions ◽  
Copper Ions ◽  
Incident Light ◽  
Copper Ion ◽  
Intensity Change ◽  
Optical Absorbance ◽  
Sensing System ◽  
Optic Sensor ◽  
Cu Ions

The optical characteristics of copper ion detection, such as the photometric absorbance of specific wavelengths, exhibit significant intensity change upon incident light into the aqueous solutions with different concentrations of metal ions due to the electron transition in the orbit. In this study, we developed a low-cost, small-size and fast-response photoelectric sensing prototype as an optic sensor for copper (Cu) ions detection by utilizing the principle of optical absorption. We quantified the change of optical absorbance from infra-red (IR) light emitting diodes (LEDs) upon different concentrations of copper ions and the transmitted optical signals were transferred to the corresponding output voltage through a phototransistor and circuit integrated in the photoelectric sensing system. The optic sensor for copper (Cu) ions demonstrated not only excellent specificity with other metal ions such as cadmium (Cd), nickel (Ni), iron (Fe) and chloride (Cl) ions in the same aqueous solution but also satisfactory linearity and reproducibility. The sensitivity of the preliminary sensing system for copper ions was 29 mV/ppm from 0 to 1000 ppm. In addition, significant ion-selective characteristics and anti-interference capability were also observed in the experiments by the proposed approach.

Modeling Arsenic(V) Removal from Water by Sulfate Modified Iron‐Oxide Coated Sand (SMIOCS)

2005 ◽  
Vol 39 (3) ◽  
pp. 645-666 ◽  
Author(s):  
Rakesh Chandra Vaishya ◽  
Sudhir Kumar Gupta
Keyword(s):  
Iron Oxide ◽  
Coated Sand

scholarly journals Enzyme Method-Based Microfluidic Chip for the Rapid Detection of Copper Ions

Micromachines ◽  
2021 ◽  
Vol 12 (11) ◽  
pp. 1380
Author(s):  
Binfeng Yin ◽  
Xinhua Wan ◽  
Changcheng Qian ◽  
A. S. M. Muhtasim Fuad Sohan ◽  
Teng Zhou ◽  
...  
Keyword(s):  
Metal Ions ◽  
Microfluidic Chip ◽  
Limit Of Detection ◽  
Copper Ions ◽  
Practical Applications ◽  
Enzyme Method ◽  
In Series ◽  
High Concentrations ◽  
Biochemical Detection ◽  
Seawater Samples

Metal ions in high concentrations can pollute the marine environment. Human activities and industrial pollution are the causes of Cu2+ contamination. Here, we report our discovery of an enzyme method-based microfluidic that can be used to rapidly detect Cu2+ in seawater. In this method, Cu2+ is reduced to Cu+ to inhibit horseradish peroxidase (HRP) activity, which then results in the color distortion of the reaction solution. The chip provides both naked eye and spectrophotometer modalities. Cu2+ concentrations have an ideal linear relationship, with absorbance values ranging from 3.91 nM to 256 μM. The proposed enzyme method-based microfluidic chip detects Cu2+ with a limit of detection (LOD) of 0.87 nM. Other common metal ions do not affect the operation of the chip. The successful detection of Cu2+ was achieved using three real seawater samples, verifying the ability of the chip in practical applications. Furthermore, the chip realizes the functions of two AND gates in series and has potential practical implementations in biochemical detection and biological computing.

scholarly journals Natural Batch Adsorption Operation to Remove Dissolved Copper (II) by Carbon Charcoal Rambutan

2021 ◽  
Vol 2129 (1) ◽  
pp. 012010
Author(s):  
B Haryanto ◽  
S E Saragih ◽  
R Tambun ◽  
H Harahap ◽  
K Manik ◽  
...  
Keyword(s):  
Metal Ions ◽  
Copper Ions ◽  
Copper Ion ◽  
Mesh Size ◽  
Total Weight ◽  
Batch Adsorption ◽  
Adsorbent Surface ◽  
Instrument Analysis

Abstract Carbon charcoal was made from rambutan rods and used as an adsorbent. A gram 70/100 mesh size of adsorbent was then used to adsorb 100 ml of copper ion solution with a 70 ppm concentration. In this investigation, the batch procedure was used without shaking (naturally). The charcoal carbon rambutan ability to remove the copper ion was measured by AAS. The percentage result was 48,135% or about 33,694 ppm. SEM and EDX instrument analysis have applied to confirm the presence of copper ions on the adsorbent surface. The copper ion was found at a concentration of 0.09 percent of the total weight. The carbon charcoal adsorbent in rambutan rods has the ability to purify the water contaminated by metal ions.

scholarly journals Role of solution chemistry in the retention and release of graphene oxide nanomaterials in uncoated and iron oxide-coated sand

2017 ◽  
Vol 579 ◽  
pp. 776-785 ◽  
Author(s):  
Dengjun Wang ◽  
Chongyang Shen ◽  
Yan Jin ◽  
Chunming Su ◽  
Lingyang Chu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Iron Oxide ◽  
Solution Chemistry ◽  
Coated Sand
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