Engineered Magnetic Carbon-Based Adsorbents for the Removal of Water Priority Pollutants: An Overview

Reynel-Ávila, Hilda Elizabeth; Camacho-Aguilar, K.I.; Bonilla-Petriciolet, Adrián; Mendoza-Castillo, Didilia I.; González-Ponce, Herson Antonio; Trejo-Valencia, R.

doi:10.1155/2021/9917444

Cited by 20 publications

(8 citation statements)

References 251 publications

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“…These are majorly used for the purification of industrial waste water. These adsorbents have an edge over the other adsorbents, in that they enable the use of alternative and intensified equipment such as the magnetically stabilized fluidized beds, thus, offering new alternatives for water treatment [67].…”

Section: Carbon-based Adsorbentsmentioning

confidence: 99%

Fluoridated Water, Effects and Green Removal Techniques

A. Okello,

N. Ndunda,

Esitsakha

et al. 2024

Water Quality - New Perspectives

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Fluoride is a naturally occurring mineral released by rocks into water, soil and air. It elicits dual effects to organisms. Its beneficial effects are effected through water fluoridation to adjust fluoride content in drinking water to acceptable levels that are deemed to prevent tooth decay. Moreover, fluoride itself may be dangerous at high levels. Excessive fluoride causes dental fluorosis and skeletal fluorosis or even severe form of fluorosis known as “crippling skeletal fluorosis,” characterized by muscle wasting, immobility and neurological problems. Studies on fluoride levels are important so as to protect organisms from the adverse effect of high fluoride exposure. Various conventional and sensor-based technologies have been applied, leading to the detection of fluoride in water systems across the globe, with some regions reporting levels above the World Health Organization (WHO) limits. This necessitates interventions to reduce the levels of fluoride in drinking water. Green technologies are emerging as viable options for fluoride remediation since they are associated with minimal environmental contamination. Knowledge on fluoride in the environment is a key and therefore, this chapter provides an overview of fluorides, their monitoring in the environment, benefits as well as health effects and removal technologies that range from conventional to green technologies.

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Section: Carbon-based Adsorbentsmentioning

confidence: 99%

Fluoridated Water, Effects and Green Removal Techniques

A. Okello,

N. Ndunda,

Esitsakha

et al. 2024

Water Quality - New Perspectives

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“…However, the lamellae of powdered graphene tend to agglomerate due to π–π stacking, reducing the actual specific surface area . Graphene oxide (GO) is a graphene derivative containing abundant oxygen-containing functional groups such as epoxy, hydroxyl, and carboxyl groups, enabling GO to strongly interact with dyes and to be well dispersible in water,. ,, Particularly, these oxygen-containing functional groups allow GO to attract organic dyes through electrostatic interaction. Furthermore, the internal aromatic ring of GO interacts with aromatic organic contaminants through π–π stacking .…”

Section: Introductionmentioning

confidence: 99%

“…This can lead to secondary pollution and hinder the regeneration and recycling of the adsorbent. Modifications of GO have been explored to overcome these issues, including magnetic particle loading and the construction of three-dimensional aerogels . Graphene aerogel (GA) is a three-dimensional structure assembled from graphene lamellae that forms a solid material with a porous interconnected network .…”

Section: Introductionmentioning

confidence: 99%

rGO/ZIF-8 Aerogel for Effective Removal of Malachite Green from Wastewater

Li,

Liu,

Gao

et al. 2024

Langmuir

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In this study, dopamine-modified graphene aerogel (DGA) is synthesized through a one-step hydrothermal method using graphene oxide as the precursor and dopamine as the reducing agent. Subsequently, in situ immersion synthesis is conducted to obtain ZIF-8 loaded on a dopamine-modified graphene aerogel skeleton (ZDGA), featuring a regular honeycomb interconnected mesoporosity and a high specific surface area of 532.8 m2/g. The synthesized ZDGA exhibited exceptional adsorption performance for the cationic dye malachite green. At room temperature, ZDGA achieved an impressive equilibrium adsorption capacity of 6578.34 mg/g. The adsorption process followed pseudo-secondary kinetics and adhered to the Langmuir model, indicating chemically dominated adsorption on a monomolecular layer. Intraparticle diffusion was the primary rate determinant, with π–π stacking, electrostatic adsorption, hydrogen bonding, and Lewis acid–base interactions serving as the key driving forces. It has an ideal specific surface area and good cycling performance, which highlights its potential application in dye wastewater treatment.

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“…The last stage was performed at 800 • C in a vacuumed furnace. A number of magnetic adsorbent preparation schemes from biomass and other available sources were discussed in [21].…”

Section: Introductionmentioning

confidence: 99%

The Adsorption Performance of Porous Activated Carbons Prepared from Iron (II) Precursors Precipitated on the Porous Carbon Matrix Thermolysis

et al. 2023

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The creation of new compounds featuring high adsorption and catalytic performance with magnetic properties of the material is one of the important fields of magnetochemistry. The typical synthetic schemes of magnetic carbonaceous adsorbents are rather complicated due to the use of inert atmosphere and difficult wet methods of magnetite precipitation. The arising experimental issues prevent industrial production of magnetically activated carbons. In order to overcome these obstacles, we suggested a novel approach to porous carbons: magnetite composite synthesis based on iron (II) salt precipitation on porous carbon and subsequent thermolysis. We facilitated the process at the stage of the material washing. The synthetic route used is simple and can be applied industrially. The present paper is focused on the adsorption performance of a product prepared from commercial activated carbons BAU-A and AG-3. The porous structure was studied with low-temperature nitrogen adsorption that revealed surface area decreased by 26% in the case of BAU-A and 40% in the case of AG-3 with an increase in mesopore volume. Phenol and nitrobenzene adsorption from water solution was tested with magnetic carbon prepared from BAU-A. The adsorption isotherms obtained are described well using the Langmuir model. The limiting adsorption value in the case of magnetic porous carbon is lower than in the case of pristine carbon. The relative decrease in limiting adsorption value is close to the relative decrease in the specific surface area. The adsorption constant remains the same, showing that adsorption centers of phenol and nitrobenzene are the same for porous magnetic carbon and its activated carbon precursor. Thus, we showed in the present study that the magnetically activated carbons we developed almost retain the adsorption performance of their activated carbon precursors.

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Engineered Magnetic Carbon-Based Adsorbents for the Removal of Water Priority Pollutants: An Overview

Cited by 20 publications

References 251 publications

Fluoridated Water, Effects and Green Removal Techniques

Fluoridated Water, Effects and Green Removal Techniques

rGO/ZIF-8 Aerogel for Effective Removal of Malachite Green from Wastewater

The Adsorption Performance of Porous Activated Carbons Prepared from Iron (II) Precursors Precipitated on the Porous Carbon Matrix Thermolysis

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