ORIGINAL RESEARCH
Enhanced Adsorption of Two Reactive Dyes
onto Al-Based Waterworks Sludge
Modified by Calcination
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1
School of Water Resources, North China University of Water Resources and Electric Power,
Zhengzhou 450046, PR China
2
Henan Key Laboratory of Water Resources Conservation and Intensive Utilization in the Yellow River Basin,
Zhengzhou 450046, PR China
3
School of Water conservancy, North China University of Water Resources and Electric Power,
Zhengzhou 450046, PR China
4
Zhongzhou Water Holding Co., Ltd., Zhengzhou 450000, PR China
5
School of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power,
Zhengzhou 450045, PR China
Submission date: 2022-10-19
Final revision date: 2023-01-01
Acceptance date: 2023-01-07
Online publication date: 2023-03-10
Publication date: 2023-04-14
Corresponding author
Jingxi Tie
north chian unversity of water resource and electric power, No.36 North ring road, 450011, zhengzhou, China
Pol. J. Environ. Stud. 2023;32(3):2373-2381
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ABSTRACT
Al-based waterworks sludge (ABWS) modified by calcination was reused as an adsorbent for
the removal two reactive dyes, namely, reactive yellow 176 (RY-176) and reactive red 195 (RR-195)
from aqueous solution. 800ºC was proved to be the optimal calcination temperature in the range
of 200-900ºC. A series of static adsorption experiments were carried out using ABWS calcinated at
800ºC (ABWS-800) as adsorbent. The results indicated that the adsorption of both the two dyes by
ABWS-800 was almost independent of initial solution pH, and the adsorption capacity of ABWS-800
for RR-195 was about 1.4 times higher than that for RY-176. The pseudo-second-order kinetic model was
best among the three models to describe the adsorption of the two reactive dyes, and Freundlich isotherm
model was better matched than the Langmuir isotherm model to describe the adsorption process.
Na2SO4 inhibited the adsorption of the two dyes onto ABWS-800. This work provided the theoretical
basis and technical support for the optimization of reaction conditions for the decontamination of dyes
wastewater by “waste” ABWS.