Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

1.7K
Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
1.7K
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

432
Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
432
Sample Preparation for Analysis: Advanced Techniques01:08

Sample Preparation for Analysis: Advanced Techniques

304
Accurate analysis of complex samples often requires advanced preparation techniques to achieve reliable and reproducible results. Samples containing inorganic or organic materials can be challenging to dissolve or decompose effectively. Standard sample preparation methods include acid digestion, fusion, dry ashing, and wet digestion.
Acid digestion with strong acids is commonly used to dissolve inorganic materials that are insoluble (do not dissolve) in water. This method can be useful for...
304
Washing, Drying, and Ignition of Precipitates00:52

Washing, Drying, and Ignition of Precipitates

885
After filtration, the precipitate is washed to remove coprecipitated impurities and any remaining mother liquor. Colloidal precipitates, such as silver chloride, are washed with an electrolyte (such as dilute nitric acid) to prevent the peptization of the precipitate. In the case of slightly soluble precipitates, the wash solution contains a common ion to reduce solubility. Lead sulfate, which is slightly soluble in water, is washed with dilute sulfuric acid. Similarly, wash solutions may be...
885
Precipitation Gravimetry01:03

Precipitation Gravimetry

5.5K
Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
5.5K
Precipitation of Ions03:11

Precipitation of Ions

27.8K
Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
27.8K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Sulfate removal from acid mine drainage using adsorbents derived from drinking water treatment plant residue: synthesis, characterization and comprehensive analysis.

Environmental geochemistry and health·2025
Same author

The Shift Toward Outpatient Care in India: Evidence From National Health Surveys, 2014 and 2017-18.

Asia-Pacific journal of public health·2025
Same author

Coverage of continuum of Maternal, Newborn and Child Health (MNCH) care in a nationally representative sample of 40,687 mother-child dyads of India: a report from NFHS-5.

BMC public health·2025
Same author

Corrigendum to 'Effective removal of selenium from aqueous solution using iron-modified dolochar: A comprehensive study and machine learning predictive analysis' [Environ. Res. 263 (2024) 120003].

Environmental research·2025
Same author

How a low income state of India managed the unemployment situation during COVID-19? Lessons for future pandemic management.

Journal of public health research·2023
Same author

Coal mine waste characterization and defluoridation property.

Heliyon·2023

Related Experiment Video

Updated: Jun 12, 2025

Removal of Arsenic Using a Cationic Polymer Gel Impregnated with Iron Hydroxide
08:01

Removal of Arsenic Using a Cationic Polymer Gel Impregnated with Iron Hydroxide

Published on: June 28, 2019

7.5K

Effective Removal of Selenium from Aqueous Solution using Iron-modified Dolochar: A Comprehensive Study and Machine

Pallavi Behera1, Himanshu Bhushan Sahu1

  • 1Department of Mining Engineering, National Institute of Technology Rourkela, India.

Environmental Research
|September 18, 2024
PubMed
Summary

Iron-doped dolochar (FeD) effectively removes ~98% of selenium from water. This study details FeD

Keywords:
AdsorptionDolocharIsothermRegenerationRegression learnerSeleniumTechno-economics

More Related Videos

Setup of Capillary Electrophoresis-Inductively Coupled Plasma Mass Spectrometry CE-ICP-MS for Quantification of Iron Redox Species FeII, FeIII
04:48

Setup of Capillary Electrophoresis-Inductively Coupled Plasma Mass Spectrometry CE-ICP-MS for Quantification of Iron Redox Species FeII, FeIII

Published on: May 4, 2020

8.0K
Detection and Recovery of Palladium, Gold and Cobalt Metals from the Urban Mine Using Novel Sensors/Adsorbents Designated with Nanoscale Wagon-wheel-shaped Pores
10:31

Detection and Recovery of Palladium, Gold and Cobalt Metals from the Urban Mine Using Novel Sensors/Adsorbents Designated with Nanoscale Wagon-wheel-shaped Pores

Published on: December 6, 2015

28.0K

Related Experiment Videos

Last Updated: Jun 12, 2025

Removal of Arsenic Using a Cationic Polymer Gel Impregnated with Iron Hydroxide
08:01

Removal of Arsenic Using a Cationic Polymer Gel Impregnated with Iron Hydroxide

Published on: June 28, 2019

7.5K
Setup of Capillary Electrophoresis-Inductively Coupled Plasma Mass Spectrometry CE-ICP-MS for Quantification of Iron Redox Species FeII, FeIII
04:48

Setup of Capillary Electrophoresis-Inductively Coupled Plasma Mass Spectrometry CE-ICP-MS for Quantification of Iron Redox Species FeII, FeIII

Published on: May 4, 2020

8.0K
Detection and Recovery of Palladium, Gold and Cobalt Metals from the Urban Mine Using Novel Sensors/Adsorbents Designated with Nanoscale Wagon-wheel-shaped Pores
10:31

Detection and Recovery of Palladium, Gold and Cobalt Metals from the Urban Mine Using Novel Sensors/Adsorbents Designated with Nanoscale Wagon-wheel-shaped Pores

Published on: December 6, 2015

28.0K

Area of Science:

  • Environmental Chemistry
  • Materials Science
  • Adsorption Science

Background:

  • Selenium (Se) is an essential micronutrient but toxic in excess, posing risks to human health and ecosystems.
  • Effective removal of selenium from aqueous solutions is crucial for environmental protection and water safety.

Purpose of the Study:

  • To investigate the efficacy of iron-doped dolochar (FeD) as an adsorbent for selenium removal from aqueous solutions.
  • To characterize FeD and understand its surface properties influencing selenium adsorption.
  • To optimize adsorption parameters and evaluate the adsorption mechanism and thermodynamics.

Main Methods:

  • Characterization of iron-doped dolochar (FeD) using SEM, EDX, BET, XRD, and FTIR.
  • Adsorption experiments conducted by varying pH, dosage, contact time, and initial selenium concentration.
  • Adsorption isotherm and kinetic studies using Langmuir and pseudo-second-order models.
  • Thermodynamic analysis and investigation of competing ion effects.
  • Model comparison using Gaussian Process Regression.

Main Results:

  • FeD exhibited a high surface area (100 m²/g) and optimal adsorption at pH 2, with ~98% selenium removal achieved.
  • Adsorption followed Langmuir isotherm (R² = 0.99) and pseudo-second-order kinetics, indicating monolayer adsorption.
  • Thermodynamic studies revealed a spontaneous, endothermic adsorption process with increased randomness.
  • Phosphate, sulfate, and nitrate ions showed the most significant interference in selenium adsorption.

Conclusions:

  • Iron-doped dolochar (FeD) is a highly effective adsorbent for selenium removal from aqueous solutions.
  • The adsorption process is well-described by Langmuir isotherms and pseudo-second-order kinetics.
  • FeD presents a promising, cost-effective solution for selenium remediation with a potential ROI of 35.5%.