Removal of inorganic and organic phosphorus compounds from aqueous solution by ferrihydrite decoration onto graphene

Li, Xuguang; Elgarhy, Abdelbaky Hossam; Hassan, Mohamed Elfatih; Chen, Yanbo; Liu, Guanglong; Elkorashey, Reham M.

doi:10.1007/s10661-020-08325-y

“…Zhao [5] showed that HCl achieved a high desorption efficiency of 90%; however, its use in the desorption of phosphorus from red mud was not clarified therein. Therefore, several studies were conducted to verify the use of phosphorus as a desorbent for red mud [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Phosphorus adsorbed by HCl desorption–activated red mud adsorbents: a molecular dynamics studys

Li,

Yang,

Qiu

et al. 2024

Mater. Res. Express

0

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In this study, modified red mud after phosphorus adsorption was used as the adsorbent, and hydrochloric acid and deionized water were used as desorbents to desorb phosphorus. The components in the adsorbent were optimized based on density functional theory, and adsorbent and desorbent models were established. Molecular dynamics simulation was performed to determine the phosphorus concentration before and after desorption, interaction energies, radial distribution function(RDF), mean-square displacement(MSD), and diffusion coefficient. The Monte Carlo method was used to simulate the desorption isotherm, desorption site, heat of desorption, and desorption energy. Simulation results showed that deionized water could only desorb phosphorus on the adsorbent surface, and the stability of the system deteriorated upon adding hydrochloric acid. Hydrochloric acid destroyed the ionic and hydrogen bonding between the O atoms in H2PO4− and reactive metal and oxygen atoms in the activated red mud particles. Moreover, the van der Waals force decreased considerably. The ionic and hydrogen bonds between H2PO4− and the surface of activated red mud particles were broken by hydrochloric acid, which accelerated the desorption of phosphorus from the adsorbent surface. The interaction between hydrochloric acid and phosphorus accelerated the diffusion, which decreased the adsorption capacity. Moreover, the desorption capacity increased with increasing temperature.

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“…The phosphate ion is a limiting factor for water eutrophication. The excess of PO 4 –3 (aq) stimulates the overproduction of algae and phytoplankton, impacting water quality, reducing dissolved oxygen, and leading to the death of aquatic organisms. ,− All this potentially harms the water balance in lakes and oceans worldwide . Even the proliferation of cyanobacteria and harmful algal blooms can be triggered in more severe cases …”

Section: Introductionmentioning

confidence: 99%

Unraveling the Phosphorus Adsorption Mechanisms in Three-dimensional Reduced Graphene Oxide Materials

Côrtes,

Bitencourt Leão,

Reis

et al. 2024

Langmuir

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To prevent eutrophication, controlling the phosphate concentration levels is one of the most important issues in surface water management. One of the most utilized methods is phosphate adsorption. However, its application faces a bottleneck due to the unclear understanding of adsorption and interaction mechanisms. The present work unlocks the phosphorus adsorption mechanisms in three-dimensional reduced graphene oxide with different reduction levels and pore sizes to remove phosphate from water using experiments and multiscale simulations. Experiments were performed to evaluate the influence of pH, ionic strength, and temperature on the adsorption. Molecular Dynamics and Ab Initio simulations evaluated the influence of the pore size and oxidation degrees of the materials. We show that the adsorption capacity of the materials increases with increasing pH and ionic strength and decreasing temperature. It is observed that the more oxidized the material and the less compact the structure, the better the adsorption. These results are theoretically explained in terms of the interaction of functional groups and the clustering of phosphate ions, which results in better adsorption in materials with larger pores. The underlying mechanisms for the 3D-reduced graphene oxide performance were confirmed by spectroscopy analysis. All the results show that 3D-reduced graphene oxide can sorb phosphate in different complex water remediation systems with characteristics that can be modulated by changing the material synthesis method.

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“…Biotechnology is widely applied to remove phosphorus in water due to low operating costs, but the phosphorus removal efficiency is not satisfied with the requirements [4]. In recent years, many modern techniques and technologies have also been applied such as electrolysis and reverse osmosis membrane [5][6][7]. A few studies have also reported on the adsorption technology applied to remove organic phosphorus [6,7].…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, many modern techniques and technologies have also been applied such as electrolysis and reverse osmosis membrane [5][6][7]. A few studies have also reported on the adsorption technology applied to remove organic phosphorus [6,7]. In 2020, two projects at the Tan Rai Alumina Factory in Lam Dong province, Vietnam, exploited more than 1.4 million tons of alumina.…”

Section: Introductionmentioning

confidence: 99%

Application of Mesopore-Activated Red Mud for Phosphorus Adsorption

Trung

¹

,

Ning

²

,

Dan

³

2022

Adsorption Science & Technology

1

0

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In this paper, the mesopore-activated red mud (M-ARM) was prepared by treating red mud (RM) with acid under an ultrasonic batch and through heat treatment at 750 C. The surface area and adsorption average pore width of M-ARM were calculated and obtained values of 13.408 m2 g-1 and 25.160 nm, respectively. Therefore, the maximum adsorption capacity of M-ARM for phosphorus was 200.85 ± 1.66 mg g − 1 at 318 K and pH = 5 . At a low initial concentration (75 mg L-1), the phosphorus removal capacity by M-ARM material was up to 97.09 ± 0.15 % at 313 K. With the temperature scales varying from 298 to 313 K, the values of Gibbs free energy change ( Δ G ° ) were negative and also vary from -37.47 to -36.68. The phosphorus adsorption process in an aqueous solution is spontaneous, and this adsorption process was exothermic with enthalpy change ∆ H o = − 14.36 . From the results of investigations and calculations of thermodynamic values, kinetics, and adsorption capacity of materials, we can confirm that the materials in this study had a low-cost and potential material for applications to treat phosphorus-contaminated water. In addition, the adsorption kinetics of this material for phosphorus were also studied and discussed.

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Removal of inorganic and organic phosphorus compounds from aqueous solution by ferrihydrite decoration onto graphene

Cited by 12 publications

References 23 publications

Phosphorus adsorbed by HCl desorption–activated red mud adsorbents: a molecular dynamics studys

Phosphorus adsorbed by HCl desorption–activated red mud adsorbents: a molecular dynamics studys

Unraveling the Phosphorus Adsorption Mechanisms in Three-dimensional Reduced Graphene Oxide Materials

Application of Mesopore-Activated Red Mud for Phosphorus Adsorption

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