U.S. flag An official website of the United States government.
Official websites use .gov

A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS

A lock ( ) or https:// means you've safely connected to the .gov website. Share sensitive information only on official, secure websites.

i

Measurement and Modeling of Water Vapor Sorption on Nano-Sized Coal Particulates and Its Implication on Its Transport and Deposition in the Environment



Details

  • Personal Author:
  • Description:
    One major cyclical environmental parameter within the underground mine space is the fluctuation of relative humidity, which varies daily and seasonally. Therefore, moisture and dust particle interactions are inevitable and indirectly control dust transport and fate. After being released into the environment, the coal dust particles stay there for a long period depending upon several parameters such as particle size, specific gravity, ventilation etc. Due to their smaller size, nano-sized coal dust particles could remain in the mine environment indefinitely while interacting with it. Correspondingly the primary characteristic of nano-sized coal dust particles could get modified. The nano-sized coal dust samples were prepared in the lab and characterized using different techniques. The prepared samples were allowed to interact with moisture using the dynamic vapor sorption technique. It was found that the lignite coal dust particles could adsorb up to 10 times more water vapor than the bituminous coal dusts. Oxygen content is one of the primary factors in deciding the total effective moisture adsorption in the nano-sized coal dust, with moisture adsorption proportional to the oxygen content of the coal. This means that lignite coal dust is more hygroscopic when compared to bituminous coal dust. GAB and Freundlich's models perform well for water uptake modeling. Because of interaction with atmospheric moisture, particularly swelling, adsorption, moisture retention, and particle size changes, such interactions will significantly change the physical characteristics of nano-sized coal dust. This will affect the transport and deposition behavior of coal dust in the mine atmosphere. [Description provided by NIOSH]
  • Subjects:
  • Keywords:
  • ISSN:
    0048-9697
  • Document Type:
    Text
  • Funding:
    Contract
  • Genre:
    Journal Article
  • Place as Subject:
  • CIO:
    National Institute for Occupational Safety and Health (NIOSH)
  • Topic:
    Workplace Safety & Health
  • Location:
    North America
  • Volume:
    889
  • NIOSHTIC Number:
    nn:20067677
  • Citation:
    Sci Total Environ 2023 Sep; 889:164095
  • Contact Point Address:
    Shimin Liu, Department of Energy and Mineral Engineering, Pennsylvania State University, 224 Hosler Building, University Park, PA 16802, USA
  • Email:
    szl3@psu.edu
  • Federal Fiscal Year:
    2023
  • Performing Organization:
    Pennsylvania State University
  • Peer Reviewed:
    True
  • Start Date:
    20190827
  • Source Full Name:
    Science of the Total Environment
  • Collection(s):
  • Main Document Checksum:
    urn:sha-512:fd8168ed93d39ff65f32d8c19b06f3d70ea98b8089982a0171bd82dd434dbbca4c154283a1bb89e3b1c761182f19f2027156d100ebe58a65e5d638ca13a286b8
  • Download URL:
  • File Type:
    Filetype[PDF - 4.66 MB ]
PREVIOUS
ON THIS PAGE
Details
CDC STACKS serves as an archival repository of CDC-published products including scientific findings, journal articles, guidelines, recommendations, or other public health information authored or co-authored by CDC or funded partners.

As a repository, CDC STACKS retains documents in their original published format to ensure public access to scientific information.
BACK TO TOP