ORIGINAL RESEARCH
Optimization of The Modified Soybean Straw
Activated Carbon for Adsorption of Methylene
Blue Dye by Response Surface Methodology
More details
Hide details
1
School of Public Utilities, Jiangsu Urban and Rural Construction Vocational College, Changzhou 213247, China
2
CAUPD Beijing Planning & Design Consultants Company, Beijing, 100044, China
Submission date: 2023-04-17
Final revision date: 2023-05-15
Acceptance date: 2023-05-20
Online publication date: 2023-07-12
Publication date: 2023-08-11
Corresponding author
Rurong Jiang
Jiangsu Urban and Rural Construction Vocational College, China
Pol. J. Environ. Stud. 2023;32(5):4073-4082
KEYWORDS
TOPICS
ABSTRACT
A low-cost modified soybean straw activated carbon (M-SSAC) adsorbent was prepared from
soybean straw for the methylene blue (MB) adsorption from dye wastewater. The effects of pH,
adsorbent dosage, initial MB concentration, and adsorption time on the adsorption of MB were
investigated by response surface methodology (RSM), and the experimental conditions were optimized.
The results showed that the adsorbent dosage had the most significant effect on the adsorption capacity
of MB adsorbed by M-SSAC. The best adsorption effect was achieved at pH 6.6, an adsorbent dosage
of 0.05 g, an initial MB concentration of 190 mg/L, and an adsorption time of 110 min, with an average
adsorption capacity of 41.96 mg/g and an error of 1.19% from the predicted value. This result indicated
that the optimized adsorption conditions based on the response surface method are accurate and
reliable. Compared with the Freundlich model, the Langmuir model was more suitable for modeling the
adsorption of MB by the M-SSAC. The adsorption process was consistent with Pseudo-second-order
kinetics, and the thermodynamic calculations showed that the adsorption process was a spontaneous
heat absorption process. The results suggest that M-SSAC is a promising adsorbent for effectively
removing MB dye from wastewater.