WeChat Mini Program
Old Version Features

Adsorption and Selective Mechanism of Pb2+and Cd2+on the Surface of Calcined Modified Attapulgite

SEPARATION AND PURIFICATION TECHNOLOGY(2025)

Engineering Research Center of Ministry of Education for Carbon Emission Reduction in Metal Resource Exploitation and Utilization

Cited 5|Views6
Abstract
The utilization of attapulgite (ATP for short) is widely employed in the remediation of heavy metal-contaminated wastewater and soil. However, its precise mechanism of action remains unclear. This study delves into the adsorption and selectivity mechanisms of Pb2+ and Cd2+ on calcined attapulgite surfaces. The investigation aims to elucidate the intricate processes by which these heavy metal ions interact with the modified attapulgite, shedding light on their respective affinities and preferences for binding sites. The modificated ATP (BS-ATP for short) was prepared through calcination at 450degree celsius to remove Pb2+ and Cd2+ from aqueous solutions. X-ray diffraction, thermogravimetric analysis, and infrared spectrum revealed that the crystal structure of BS-ATP remained fundamentally unaltered following the process of calcination. X-ray photoelectron spectroscopy confirmed the stable adsorption of both Pb2+ and Cd2+ by BS-ATP. The adsorption experiment revealed that BSATP exhibited a significantly greater equilibrium adsorption capacity for Pb2+ (84.64 mg/L) compared to Cd2+ (23.10 mg/L), indicating a pronounced selective adsorption preference for Pb2+. Density functional theory (DFT) calculations have revealed that the adsorption energy of BS-ATP for Pb2+ is lower (-111.2KJ/mol) than for Cd2+ (-35.2KJ/mol). Furthermore, a distinct bonding interaction has been observed between Pb and the hydroxyl oxygen in the BS-ATP surface, with the Pb-O bond length ranging from 2.52 & Aring; to 2.92 & Aring;. The combined experimental and theoretical findings show that Pb2+ has a higher affinity and greater stability in adsorbing onto BS-ATP surfaces compared to Cd2+. This research enhances our understanding of the molecular mechanisms behind the selective adsorption of Pb2+ by attapulgite.
More
Translated text
Key words
Attapulgite,Calcination modification,Adsorption mechanism,DFT
求助PDF
上传PDF
Bibtex
AI Read Science
AI Summary
AI Summary is the key point extracted automatically understanding the full text of the paper, including the background, methods, results, conclusions, icons and other key content, so that you can get the outline of the paper at a glance.
Example
Background
Key content
Introduction
Methods
Results
Related work
Fund
Key content
  • Pretraining has recently greatly promoted the development of natural language processing (NLP)
  • We show that M6 outperforms the baselines in multimodal downstream tasks, and the large M6 with 10 parameters can reach a better performance
  • We propose a method called M6 that is able to process information of multiple modalities and perform both single-modal and cross-modal understanding and generation
  • The model is scaled to large model with 10 billion parameters with sophisticated deployment, and the 10 -parameter M6-large is the largest pretrained model in Chinese
  • Experimental results show that our proposed M6 outperforms the baseline in a number of downstream tasks concerning both single modality and multiple modalities We will continue the pretraining of extremely large models by increasing data to explore the limit of its performance
Upload PDF to Generate Summary
Must-Reading Tree
Example
Generate MRT to find the research sequence of this paper
Data Disclaimer
The page data are from open Internet sources, cooperative publishers and automatic analysis results through AI technology. We do not make any commitments and guarantees for the validity, accuracy, correctness, reliability, completeness and timeliness of the page data. If you have any questions, please contact us by email: report@aminer.cn
Chat Paper
Summary is being generated by the instructions you defined