Preparation of Porous Biochars by the Co-Pyrolysis of Municipal Sewage Sludge and Hazelnut Shells and the Mechanism of the Nano-Zinc Oxide Composite and Cu(II) Adsorption Kinetics

Xi Chen, Ran Zhang, Bing Zhao, Guangjian Fan, Haibo Li, Xinyang Xu and Mingchuan Zhang
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Xi Chen: School of Resource and Civil Engineering, Northeastern University, Shenyang 110819, China
Ran Zhang: School of Resource and Civil Engineering, Northeastern University, Shenyang 110819, China
Bing Zhao: School of Resource and Civil Engineering, Northeastern University, Shenyang 110819, China
Guangjian Fan: School of Resource and Civil Engineering, Northeastern University, Shenyang 110819, China
Haibo Li: School of Resource and Civil Engineering, Northeastern University, Shenyang 110819, China
Xinyang Xu: School of Resource and Civil Engineering, Northeastern University, Shenyang 110819, China
Mingchuan Zhang: School of Resource and Civil Engineering, Northeastern University, Shenyang 110819, China

Sustainability, 2020, vol. 12, issue 20, 1-19

Abstract: Municipal sewage sludge (MSS) and hazelnut shells were selected for co-pyrolysis and chemically activated with K 2 CO 3 in a N 2 atmosphere. The biochar was then modified by photocatalysis. Hazelnut shells, as a solid waste, were selected as a carbon source additive because of its high cellulose content and similar structure to natural wood. Using hazelnut shells could increase the specific surface area, enhance the porosity, and improve the adsorption capacity of the biochar. Hazelnut shells could also reduce the content of heavy metals in the raw biochar materials, along with increasing the ecological security of biochar and contributing to its further development and utilization. FTIR was used to study the changes in the functional groups on the biochar surface. The layered porous structure of the biochar was observed by SEM. The Cu(II) adsorption capacity of the biochar was 42.28 mg/g after 24 h. The Langmuir and pseudo-second-order models effectively described Cu(II) adsorption.

Keywords: co-pyrolysis; alkaline activating agent; Cu(II) adsorption; porous structure; photocatalysis (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2020
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