Effect of pickling on pyrolysis characteristics and adsorption properties of biomass

ABSTRACT

In order to explore the influence of pickling on the pyrolysis characteristics and adsorption performance of biomass, this paper used pickled rice husk as raw material, and used TG-FTIR coupling instrument to explore the pyrolysis characteristics and product changes of rice husk; The Coats-Redfern (C-R) method was used to analyze the pyrolysis kinetics, and the adsorption performance of pyrolysis biochar on heavy metal Cu was investigated. The results show that pickling can effectively reduce AAEMs, change the pyrolysis path, increase the release of volatiles, and increase the calorific value of raw materials by about 17.10%. The surface of rice husk retains abundant functional groups, and the vibration of characteristic peaks is more intense. The C-R kinetic analysis showed that the pyrolysis process was consistent with the reaction order n = 1, and the influence on the activation energy of rice husk was sulfuric acid > phosphoric acid > nitric acid. The pickling pyrolysis biochar can promote the adsorption of heavy metal Cu²⁺ in the aqueous phase, the adsorption capacity is up to 41.4 mg·g⁻¹, and the adsorption efficiency is up to 82.8%.

KEYWORDS:

• Pickling
• rice husk
• thermogravimetric analysis
• reaction kinetics
• adsorption property

Acknowledgements

The authors gratefully acknowledge the support of the National Natural Science Foundation of China (52176195).

Disclosure statement

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Data availability statement

No data was used for the research described in the article.

Additional information

Funding

The work was supported by the National Natural Science Foundation of China [52176195].

Notes on contributors

Yang Sun

Dr. Yang Sun is senior experimenter at Shenyang Aerospace University.

Xiaomei Zhang

Miss. Xiaomei Zhang is a master student at Shenyang Aerospace University.

Qianqian Yu

Miss. Qianqian Yu is a master student at Shenyang Aerospace University.

Tianhua Yang

Dr. Tianhua Yang is professor at Shenyang Aerospace University.

Beibei Yan

Dr. Beibei Yan is professor at Tianjin University.

Rundong Li

Dr. Rundong Li is professor at Shenyang Aerospace University.

Guanyi Chen

Dr. Guanyi Chen is professor at Tianjin University.