Bituminous activated carbon (AC) has been widely used as a sorbent for adsorption of non-polar species, but its performance for removal of ionic species such as heavy metals has not been as efficient. In this study, AC was modified with chitosan nanoparticles (CN) using facile methods of dip coating and wet impregnation. The CN-coated AC demonstrated an increase in Cr(VI) removal efficiency in both kinetics and adsorption capacity. The adsorption capacity of the CN-coated AC (mg/g) was more than twice that of the uncoated AC (36.36 mg/g), or pure chitosan (32.57 mg/g). The sizes of the synthesized CN (160-2,000 nm) can be controlled by varying the concentration of the chitosan/reagents used. The adsorption isotherms are better described using the Freundlich rather than the Langmuir model and are in agreement with the heterogeneity of the surfaces. Adsorption kinetics followed that of the pseudo-second-order kinetics, suggesting chemisorption as a rate limiting step.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.2175/106143016X14733681695528 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Characteristics of low-temperature oxidative heating and gas production in coal storage under forced convection: Influencing factors and mechanisms.
Sci Total Environ
December 2024
College of Emergency Management and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China; Beijing Key Laboratory for Precise Mining of Intergrown Energy and Resources, China University of Mining and Technology (Beijing), Beijing 10083, China.
Slow oxidation of coal during storage and transportation poses significant risks, making it essential to identify hot spots and understand the heat generation and gas production patterns in coal stockpiles. This study leverages the advantages of adiabatic oxidation experiments, which account for time effects, to accurately describe the low-temperature oxidation process of coal through warming and gas production dimensions. Additionally, the warming and gas production patterns of three-dimensional coal stockpiles with varying stacking parameters were investigated.
View Article and Find Full Text PDFEffect of Oxygen Concentration on Volatile Precipitation and Critical Ignition Point.
ACS Omega
December 2024
School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), D11 Xueyuan Road, Haidian District, Beijing 100083, P. R. China.
The purpose of this study was to investigate the impact of the oxygen concentration on the ignition of bituminous coal. Different oxygen concentrations and temperatures were used in the large-scale oxidation experiments to collect oxidized coals, which were then extracted with chloroform. And compare the critical ignition temperature of different mass samples.
View Article and Find Full Text PDFPerfluoroalkyl chemical adsorption by granular activated carbon: Assessment of particle size impact on equilibrium parameters and associated rapid small-scale column test scaling assumptions.
Water Res
December 2024
Center for Environmental Solutions & Emergency Response, U.S. Environmental Protection Agency, Cincinnati, OH 45268, USA. Electronic address:
Single-solute batch kinetic and isotherm experiments were conducted in Type 1 (18.2 MΩ·cm resistivity) water supplemented with 10 mM carbonate buffer (pH 7.75, 25 °C) for nine drinking water relevant perfluoroalkyl chemicals and three bituminous-coal based granular activated carbons (GACs).
View Article and Find Full Text PDFGolden Jackal (Canis aureus) death by road accident in rural Bengal-insight the fact: a perception based eco-spatial clarification.
Environ Monit Assess
October 2024
Department of Geography, Vidyasagar University, Midnapore, West Bengal, India.
Article Synopsis
- The golden jackal plays a crucial role in the ecosystems of rural Bengal but faces threats from habitat loss, road accidents, and human persecution.
- A study in Purba Medinipur district documented 154 jackal deaths due to road accidents from 2022 to 2023, revealing a complex relationship between their habitat loss and reliance on roadside areas for food.
- The research highlights the impact of local weather, seasonal behaviors, and driver negligence on these accidents and suggests measures for jackal conservation to support regional biodiversity.
Study on Spontaneous Combustion Characteristics and Microstructure of Bituminous Coal under Water Immersion.
ACS Omega
August 2024
School of Emergency Management and Safety Engineering, North China University of Science and Technology, Tangshan, Hebei 063210, China.
The stagnant water above the coal seam flows into the goaf, causing the goaf coal to be soaked by water for a long time. Compared with dry raw coal, water-soaked coal has a stronger tendency for spontaneous combustion, which poses a serious threat to mining operators. To unravel the impact of water immersion on coal's self-heating properties, an investigation was conducted employing techniques such as simultaneous thermogravimetric analysis/differential scanning calorimetry (TG/DSC), scanning electron microscopy (SEM), low-temperature nitrogen adsorption based on the BET theory, and Fourier transform infrared spectroscopy (FTIR).
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!