A review on the application of clay minerals as heavy metal adsorbents for remediation purposes

Otunola, Beatrice Omonike; Ololade, Olusola O.

doi:10.1016/j.eti.2020.100692

Cited by 260 publications

(95 citation statements)

References 94 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There are different methods to remove heavy metals from industrial wastewaters, including chemical precipitation, electrocoagulation, reverse osmosis, ion exchange, among others [ 18 , 19 , 20 , 21 ]. Nevertheless, most of them show disadvantages due to the technological requirements for installation, operation and maintenance, generation of toxic byproducts and high cost compared with methods such as adsorption [ 8 , 22 , 23 , 24 ]. Adsorption can be considered a promising alternative thanks to its relative simplicity, low cost, and high efficiency [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

Chemical Modification of Agro-Industrial Waste-Based Bioadsorbents for Enhanced Removal of Zn(II) Ions from Aqueous Solutions

et al. 2021

View full text Add to dashboard Cite

Contamination of water by heavy metals is a major environmental concern due to the potential ecological impact on human health and aquatic ecosystems. In this work, we studied the chemical modification of various fruit peels such as banana (BP), granadilla (GP), and orange ones (OP) in order to obtain novel bio-adsorbents to improve the removal of Zn(II) ions from 50 mg·L−1 synthetic aqueous solutions. For this purpose, sodium hydroxide and calcium acetate were employed to modify the fruit peels. The moisture, extractives, lignin, hemicellulose, and cellulose contents of the raw materials were determined according to ASTM standards. The obtained bio-adsorbents were characterized by scanning electron microscopy (SEM), Fourier Transform Infrared Spectroscopy (FTIR) and thermogravimetric analysis (TGA). The results showed the OP bio-adsorbents performed better, especially when the concentration of the modifier solutions increased, e.g., the OP particles modified using 0.8 M NaOH and Ca(CH3COO)2 solutions resulted in 97% removal of Zn(II) contaminating ions and reached a maximum adsorption capacity of 27.5 mg Zn per gram of bio-adsorbent. The adsorption processes were found to follow a pseudo-second order model. The error function sum of square error indicated the Freundlich isotherm (non-linear regression) as best fit model. The obtained results are particularly interesting for material selection in wastewater treatment technologies based on contaminant adsorption.

show abstract

Section: Introductionmentioning

confidence: 99%

Chemical Modification of Agro-Industrial Waste-Based Bioadsorbents for Enhanced Removal of Zn(II) Ions from Aqueous Solutions

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Various organic and mineral supports have been tested for Pb(II) removal from both real wastewaters and synthetic solutions. They include several raw and modified agricultural and industrial biomasses [7,8] as well as mineral materials such as clays and marble wastes [9,10].…”

Section: Introductionmentioning

confidence: 99%

Investigations on lignite use for lead removal from aqueous solutions under static and dynamic conditions: adsorption properties and mechanism exploration

Mlayah¹,

Jellali²,

Azzaz³

et al. 2021

Comptes Rendus. Chimie

View full text Add to dashboard Cite

show abstract

“…Nowadays, the presence of lead (Pb), copper (Cu), zinc (Zn), and cadmium (Cd), which are a heavy metals contaminant group that has toxic properties to humans and are usually found in waste [1,2]. Natural clay has physical and chemical properties to be able to adsorb heavy metals [3]. Several studies on natural clays' ability to adsorb heavy metals have been carried out using the batch equilibrium test, which is the simple but effective method [4,5,6,7].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Mineralogical Composition on the Adsorption Capacity of Heavy Metals Solution by Java Natural Clay, Indonesia

Budianta

2021

AEJ

View full text Add to dashboard Cite

The adsorption capacity of four clay samples (Boyolali-BYL, Sleman-SLM, Gunungkidul-GK, and Pacitan-PCT) from Java, Indonesia, for copper (Cu) lead (Pb), zinc (Zn) and cadmium (Cd) solution was investigated by using batch equilibrium test. The adsorption data were presented using an isotherm curve, and adjusted to the Langmuir equation model, which produced the maximum adsorption capacity of the clay samples. The physical, chemical, and mineralogical analysis showed that the BYL and PCT samples have higher montmorillonite content, cation exchange capacity (CEC), and specific surface area (SSA) compared to SLM and GK clay samples. The batch equilibrium test revealed that the clay samples with higher montmorillonite content produced higher heavy metal adsorption capacity due to the higher cation exchange capacity (CEC), and specific surface area (SSA). The batch equilibrium test also show that the adsorption order for the metals cations followed the selectivity order Cu2+ > Pb2+ > Zn2+ >Cd2+. The Langmuir model resulted in the adsorption processes, offering maximum adsorption capacities from 196.08 to 769.23 mg/g for Cu, 217.39 to 416.67 mg/g for Pb, 106.38 to 114.94 mg/g for Zn and 104.17 to 113.24 mg/g for Cd of four clay samples studied. The highest adsorption capacity was achieved for the BYL sample. The lowest was the GK sample, in which the order of the maximum adsorption capacity of clay samples was BYL > PCT > SLM > GK sample. This research indicated that the proportion of montmorillonite content in the clay samples affected the maximum adsorption capacity of the heavy metal in the solution.

show abstract

A review on the application of clay minerals as heavy metal adsorbents for remediation purposes

Cited by 260 publications

References 94 publications

Chemical Modification of Agro-Industrial Waste-Based Bioadsorbents for Enhanced Removal of Zn(II) Ions from Aqueous Solutions

Chemical Modification of Agro-Industrial Waste-Based Bioadsorbents for Enhanced Removal of Zn(II) Ions from Aqueous Solutions

Investigations on lignite use for lead removal from aqueous solutions under static and dynamic conditions: adsorption properties and mechanism exploration

The Influence of Mineralogical Composition on the Adsorption Capacity of Heavy Metals Solution by Java Natural Clay, Indonesia

Contact Info

Product

Resources

About