Adsorption characteristics of coal gasification fine slag with alkali-dissolution and hydrothermal treatment on methylene blue

ABSTRACT

The resource utilization of coal gasification fine slag (FS) and the harmless treatment of dyeing wastewater are crucial for establishing a zero-emission industrial system and a circular economy. This study used FS as raw material and divided it into two particle sizes through ultrasonic pretreatment enhanced wet sieving. The composite materials were synthesized via an alkaline hydrothermal process from different components in FS was compared, and applied as adsorbents for the removal of methylene blue from printing and dyeing wastewater. Finally, the kinetic and thermodynamic model developed for MB from printing and dyeing wastewater. The maximum adsorption of MB by the composite material prepared from low carbon component (<0.125 mm) could reach more than 180 mg·g⁻¹. The research results have important theoretical and practical value for guiding the high-value utilization of FS and its application in dye wastewater treatment.

HIGHLIGHTS

• The alkali-soluble hydrothermal technique synthesized the composites.

• Methylene blue maximum adsorption capacity of 180 mg·g⁻¹.

• The composites’ kinetic and thermodynamic adsorption properties on MB were clarified.

• The reaction mechanisms of different components in FS were elucidated.

KEYWORDS:

• Coal gasification fine slag
• hydrothermal
• modification
• composite material
• methylene blue

Disclosure statement

No potential conflict of interest was reported by the author(s).

Credit Authorship Contribution Statement

Ying Gao: Investigation, performed the experiments and analyzed the data, Data curation, Conceptualization, Methodology, Writing – original draft. Yujia Wang: Writing – original draft, Data curation. Yujie Yan: Data curation, Writing – review & editing. Shunlong Yan: Validation. Weidong Wang: Software, Validation, Resources, Funding Acquisition. Zhiqiang Xu: Project administration, Supervision. Meijie Sun: Writing – review & editing. Yanan Tu: Conceptualization, Writing – review & editing.

Additional information

Funding

This work was supported by the National Natural Science Foundation of China (NO.52274282, 52304311). The funder of National Natural Science Foundation of China [No.52274282] is Zhiqiang Xu,he funder of National Natural Science Foundation of China [No.52304311] is Meijie Sun.