Adsorption performance and mechanisms of MgO-modified palygorskite/biochar composite for aqueous Cd (II): Experiments and theoretical calculation

Yang, Kun; Cheng, Zhiyan; Luo, Wenxuan; Guo, Bingyue; Zhang, Bin; Zhang, Yaping

doi:10.1016/j.apsusc.2023.157965

Cited by 19 publications

(6 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It can provide valuable insights into the distribution of electron density, thereby offering crucial information regarding the reactivity and interaction capabilities of molecules and surfaces. To extract more nuanced information about adsorption mechanisms, ESP analyses on van der Waals (vdW) surfaces have been extensively quantified to extract more nuanced information about adsorption mechanisms [ 38 ]. Building upon the established utility of ESP analyses, we draw inspiration from the work of Yang et al [ 38 ], who effectively employed electrostatic potential calculations to unravel the adsorption mechanisms of aqueous Cd(II) on a MgO-modified palygorskite/biochar composite.…”

Section: Resultsmentioning

confidence: 99%

“…To extract more nuanced information about adsorption mechanisms, ESP analyses on van der Waals (vdW) surfaces have been extensively quantified to extract more nuanced information about adsorption mechanisms [ 38 ]. Building upon the established utility of ESP analyses, we draw inspiration from the work of Yang et al [ 38 ], who effectively employed electrostatic potential calculations to unravel the adsorption mechanisms of aqueous Cd(II) on a MgO-modified palygorskite/biochar composite. This research highlighted the role of oxygen (O) atoms within the MgO group, which exhibited negative electrostatic potentials, signifying electrophilic activity.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

The Effect of Nitrogen Functional Groups on Pb0, PbO, and PbCl2 Adsorption over a Carbonaceous Surface

Wang,

Wen,

Guo

et al. 2024

Molecules

View full text Add to dashboard Cite

Lead (Pb) pollution, especially from the incineration of municipal solid waste (MSW), poses a significant threat to the environment. Among all the effective methods, activated carbon (AC) injection serves as an effective approach for lead removal from flue gas, while the modification of ACs emerges as a crucial pathway for enhancing Pb adsorption capacities. Density functional theory (DFT) is employed in this study to investigate the mechanisms underlying the enhanced adsorption of Pb species (Pb0, PbO, and PbCl2) on nitrogen-functionalized carbonaceous surfaces. The results show that nitrogen-containing groups substantially enhance lead adsorption capacity, with adsorption energies ranging from −526.18 to −288.31 kJ/mol on nitrogen-decorated carbonaceous surfaces, much higher than those on unmodified surfaces (−310.35 to −260.96 kJ/mol). Additionally, electrostatic potential and density-of-states analyses evidence that pyridinic nitrogen atoms remarkably expand charge distribution and strengthen orbital hybridization, thereby augmenting lead capture. This research elucidates the role of nitrogen-containing functional groups in lead adsorption, offering valuable insights for the development of highly efficient biomass-derived activated carbon sorbents for lead removal.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

The Effect of Nitrogen Functional Groups on Pb0, PbO, and PbCl2 Adsorption over a Carbonaceous Surface

Wang,

Wen,

Guo

et al. 2024

Molecules

View full text Add to dashboard Cite

show abstract

“…The relationship between boundary voltage, sensitivity matrix, and internal conductivity distribution within the physical field can be described by equation (8) as follows:…”

Section: Mathematical Modelmentioning

confidence: 99%

“…In the adsorption of VOCs by activated carbon, two saturation distribution detection methods, the volumetric method and the mass method [8], are generally used to determine the adsorption capacity. In the volumetric method [9], the gas volume and component concentration entering/leaving the adsorber are measured to calculate the adsorption capacity of the adsorbent.…”

Section: Introductionmentioning

confidence: 99%

Dynamic detection of saturated distribution of activated carbon adsorbed volatile organic compounds based on electrical impedance tomography

Pang,

Zhao,

Sun

et al. 2024

Meas. Sci. Technol.

View full text Add to dashboard Cite

The electrical impedance tomography (EIT) has been achieved for the dynamic detection of the adsorption saturation distribution in activated carbon. Volatile organic compounds (VOCs) emitted by industries pose a serious threat to human health and environmental quality. Therefore, adsorption method is widely used to treat such organic compounds. Activated carbon, as a commonly used adsorbent material, plays a crucial role in the efficient utilization and management of the adsorption process. Traditional adsorption detection methods suffer from information loss and discontinuity. We can obtain the conductivity distribution information during the current passing through the material by measuring the potential changes on the boundary of interest field, and analyze the saturation distribution information of VOCs adsorbed on activated carbon based on the conductivity distribution image. The feasibility of the technology in monitoring the saturation distribution of the adsorption process in activated carbon was verified by principle and simulation. For experimental verification, fixed bed and fluidized bed experiments were carried out, taking into account the special case of impedance change factors of activated carbon particles in the static and flow states. The experimental results confirm that the adsorption impedance change response is well obtained at an excitation frequency of 4KHz and the saturation distribution imaging can be steady imaged regardless of whether the adsorbent is changed or not. This study introduces a new method for visualizing the monitoring process of activated carbon adsorption.

show abstract

“…Consequently, extensive endeavors are underway to devise techniques for the eradication of heavy metals from the environment, such as photocatalytic degradation, membrane separation, ion exchange, precipitation, and adsorption [5][6][7][8][9]. Among these approaches, adsorption is frequently favored owing to its simplicity, costeffectiveness, high e cacy, and reversibility [10][11].…”

Section: Introductionmentioning

confidence: 99%

Research on the Modification Process of Attapulgite with Sulfhydryl Functionalization Assisted by Polyethylene Glycol

Fu,

Pei,

Luo

et al. 2023

Preprint

View full text Add to dashboard Cite

In recent years, with the improvement of people's awareness of environmental protection, heavy metal pollution such as Cd2+ and Pb2+ has attracted high attention. This study focuses on the preparation of a highly adsorbent environmental functional material, sulfhydryl modified attapulgite (ATP-SH), through the modification of attapulgite (ATP) using polyethylene glycol-20000 (PEG-20000) as an auxiliary agent and 3-mercaptopropyltrimethoxysilane (MPT). The optimal preparation process was obtained. Furthermore, characterization of ATP and ATP-SH was performed using various techniques including FT-IR, XRD, SEM, among others. The results confirmed successful grafting of sulfhydryl groups onto ATP, with the layered crystal structure and crystallinity of ATP-SH remaining largely unchanged. However, the surface structure and thermal stability were enhanced, while the specific surface area and pore size distribution decreased due to the bulk size of the functional ligands. The characterization results of adsorption performance demonstrated that the adsorption of Cd2+ and Pb2+ by ATP-SH showed significant selectivity and stable adsorption forces. Under these conditions, the saturated adsorption capacities of ATP-SH for Cd2+ and Pb2+ were 22.71 mg/g and 65.57 mg/g, respectively, representing a respective increase of 31.96% and 57.74% compared to ATP. ATP-SH presents an effective remediation approach for heavy metal pollution in the environment.

show abstract

Adsorption performance and mechanisms of MgO-modified palygorskite/biochar composite for aqueous Cd (II): Experiments and theoretical calculation

Cited by 19 publications

References 63 publications

The Effect of Nitrogen Functional Groups on Pb0, PbO, and PbCl2 Adsorption over a Carbonaceous Surface

The Effect of Nitrogen Functional Groups on Pb0, PbO, and PbCl2 Adsorption over a Carbonaceous Surface

Dynamic detection of saturated distribution of activated carbon adsorbed volatile organic compounds based on electrical impedance tomography

Research on the Modification Process of Attapulgite with Sulfhydryl Functionalization Assisted by Polyethylene Glycol

Contact Info

Product

Resources

About