Volume 16 Issue 2
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Article Navigation >  Water Science and Engineering  > 2023  >  16(2): 192-202
Wen-de Zhao, Li-ping Chen, Yan Jiao. 2023: Preparation of activated carbon from sunflower straw through H3PO4 activation and its application for acid fuchsin dye adsorption. Water Science and Engineering, 16(2): 192-202. doi: 10.1016/j.wse.2023.02.002
Citation: Wen-de Zhao, Li-ping Chen, Yan Jiao. 2023: Preparation of activated carbon from sunflower straw through H3PO4 activation and its application for acid fuchsin dye adsorption. Water Science and Engineering, 16(2): 192-202. doi: 10.1016/j.wse.2023.02.002
shu

Preparation of activated carbon from sunflower straw through H3PO4 activation and its application for acid fuchsin dye adsorption

doi: 10.1016/j.wse.2023.02.002

  • a College of Chemistry and Environmental Science, Inner Mongolia Normal University, Hohhot 010022, China;

  • b Inner Mongolia Key Laboratory of Environmental Chemistry, Hohhot 010022, China

Funds:

This work was supported by the National Natural Science Foundation of China (Grant No. 41865010), the 2020 Leading Talents of Young Science and Technology Talents in Colleges and Universities of the Inner Mongolia Autonomous Region (Grant No. NJYT-20-A04), the Project of the 10th Group of Grassland Talents of the Inner Mongolia Autonomous Region, the 2022 Inner Mongolia Outstanding Youth Fund Project, and the Key Research and Development and Achievement Transformation Program of the Inner Mongolia Autonomous Region in 2022 (Grant No. 2022YFHH0035).

  • Received Date: 2021-12-24
  • Accepted Date: 2023-03-02
  • Rev Recd Date: 2023-02-18
    • Available Online: 2023-05-11
    Abstract
  • With the development circular economy, the use of agricultural waste to prepare biomass materials to remove pollutants has become a research hotspot. In this study, sunflower straw activated carbon (SSAC) was prepared by the one-step activation method, with sunflower straw (SS) used as the raw material and H3PO4 used as the activator. Four types of SSAC were prepared with impregnation ratios (weight of SS to weight of H3PO4) of 1:1, 1:2, 1:3, and 1:5, corresponding to SSAC1, SSAC2, SSAC3, and SSAC4, respectively. The adsorption process of acid fuchsin (AF) in water using the four types of SSAC was studied. The results showed that the impregnation ratio significantly affected the structure of the materials. The increase in the impregnation ratio increased the specific surface area and pore volume of SSAC and improved the adsorption capacity of AF. However, an impregnation ratio that was too large led to a decrease in specific surface area. SSAC3, with an impregnation ratio of 1:3, had the largest specific surface area (1 794.01 m2/g), and SSAC4, with an impregnation ratio of 1:5, exhibited the smallest microporosity (0.052 7 cm3/g) and the largest pore volume (2.549 cm3/g). The adsorption kinetics of AF using the four types of SSAC agreed with the quasi-second-order adsorption kinetic model. The Langmuir isotherm model was suitable to describe SSAC3 and SSAC4, and the Freundlich isotherm model was appropriate to describe SSAC1 and SSAC2. The result of thermodynamics showed that the adsorption process was spontaneous and endothermic. At 303 K, SSAC4 showed a removal rate of 97.73% for 200-mg/L AF with a maximum adsorption capacity of 2 763.36 mg/g, the highest among the four types of SSAC. This study showed that SAAC prepared by the H3PO4-based one-step activation method is a green and efficient carbon material and has significant application potential for the treatment of dye-containing wastewater.

     

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