Formation and Physicochemical Characteristics of Nano Biochar: Insight into Chemical and Colloidal Stability

Environmental Science & Technology
Guocheng LiuBaoshan Xing

Abstract

Nano biochar (N-BC) attracts increasing interest due to its unique environmental behavior. However, understanding of its formation, physicochemical characteristics, and stability of N-BC is limited. We therefore examined N-BC formation from bulk biochars (B-BCs) produced from peanut shell, cotton straw, Chinese medicine residues, and furfural residues at 300-600 °C. Carbon stability and colloidal processes of nano peanut shell biochars (N-PBCs) were further investigated. N-BCs formed from pore collapse and skeleton fracture during biomass charring, breakup due to grinding, and sonication. Amorphous fraction in B-BCs was more readily degraded into N-BCs than graphitic component. The sonication-formed N-PBCs contained 19.2-31.8% higher oxygen and fewer aromatic structures than the bulk ones, leading to lower carbon stability, but better dispersibility in water. Heteroaggregation of N-PBCs with goethite/hematite destabilized initially and then restabilized with increasing concentrations of N-PBCs. Compared with stacked complexes of N-PBCs-hematite, the association of goethite with N-PBCs could form interlaced heterostructures, thus shielding positive charges on goethite and causing greater heteroaggregation. These findings are use...Continue Reading

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Citations

Dec 7, 2019·Environmental Science and Pollution Research International·Inga J SchreiterChristoph Schüth
Aug 21, 2019·Micromachines·Stephane Neuville
Mar 20, 2020·Environmental Science and Pollution Research International·Rashida HameedDaohui Lin
Apr 5, 2021·Journal of Hazardous Materials·Gang CaoGuilong Zhang
Jul 9, 2021·Frontiers in Plant Science·Minglong LiuGenxing Pan
Oct 11, 2020·Environment International·Hao ZhengBaoshan Xing
Jul 17, 2021·Journal of Hazardous Materials·Ling XiangXiaofei Tan
Nov 11, 2020·Environmental Science & Technology·Srinidhi LokeshYu Yang
Jun 12, 2019·Environmental Science & Technology·Yang WangStephen D Joseph
Sep 1, 2021·The Science of the Total Environment·Xueyan ChenMengfang Chen
Oct 8, 2021·The Science of the Total Environment·Hao WangWeixiang Wu

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