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Unraveling natural aging-induced properties change of sludge-derived hydrochar and enhanced cadmium sorption site heterogeneity

文献类型： 外文期刊

作者： Wang, Bingyu 1 ; Shang, Cenyao 1 ; Xie, Huifang 1 ; Sun, Haijun 3 ; Zhang, Qiang 1 ; Xue, Lihong 2 ; Tack, Filip M. G. 4 ; Hou, Deyi 5 ; Feng, Yanfang 2 ; Rinklebe, Joerg 6 ;

作者机构： 1.Nanjing Univ Sci & Technol, Sch Environm & Biol Engn, Jiangsu Key Lab Chem Pollut Control & Resources R, Nanjing 210094, Peoples R China

2.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Natl Agr Expt Stn Agr Environm, Minist Agr & Rural Affairs,Key Lab Agroenvironm D, Nanjing 210014, Peoples R China

3.Nanjing Forestry Univ, Coll Forestry, Coinnovat Ctr Sustainable Forestry Southern China, Nanjing 210037, Peoples R China

4.Univ Ghent, Dept Green Chem & Technol, B-9052 Ghent, Belgium

5.Tsinghua Univ, Sch Environm, Beijing 100084, Peoples R China

6.Univ Wuppertal, Lab Soil & Groundwater Management, Inst Fdn Engn Water & Waste Management, Sch Architecture & Civil Engn, Pauluskirchstr 7, D-42285 Wuppertal, Germany

关键词： Sludge-derived hydrochar; Hydrothermal carbonization; Natural aging; Physicochemical properties; Sorption behavior; Cadmium

期刊名称：BIOCHAR （ 影响因子：11.452； 五年影响因子：11.452 ）

ISSN： 2524-7972

年卷期： 2022 年 4 卷 1 期

页码：

收录情况： SCI

摘要： Hydrochar has potential applications in soil improvement and heavy metal remediation. Hydrochar would undergo the process of aging when introduced into the soil, altering its properties. However, recent studies have focused mainly on the artificial aging of hydrochar, which could not reveal the cumulative effect of multiple environmental factors. Therefore, the periodical monitoring of the property and sorption behavior of hydrochar after amending soils is necessary to better understand the multifaceted mechanisms associated with the natural aging of hydrochar. This study selected the sludge-derived hydrochar (SLHC) as a typical hydrochar and applied a 16-month rice-wheat-rice rotation to mimic the natural aging of hydrochar, focusing on changing properties and cadmium (Cd) sorption and literature contrast between aging strategies and biochar types. The porosity, O abundance, and ash content of 16-month aged SLHC increased by 37%, 47%, and 8.5%, respectively, facilitating Cd sorption due to surface complexation, pore sorption, and precipitation. The sorption percentage of Cd to SLHC was in the range of 11-14% for SLHC-A0 and increased to 17-31% for SLHC-A4 and 20-32% for SLHC-A16 after natural aging. The natural aging of SLHC induced by ash content played an essential role in Cd sorption site heterogeneity. Linear regression analysis showed that aging strategies on sorption behavior significantly differed between biochars. Thus, studies involving natural aging with multiple environmental factors are preferred over those involving chemical or biological aging. Future studies should continue to explore the mechanisms of natural aging-induced heavy metal sorption between hydrochar and pyrochar. These results improve insights to appraise the potential of SLHC as soil amendments to alleviate the adverse effects of heavy metal contamination and provide an essential basis for researchers and staff in soil management and environmental prevention. [GRAPHICS] Highlights center dot Aged hydrochar undergoes surface oxidation, mineral complexation, and leaching. center dot Ash content and SSA play the essential role in enhancing Cd sorption and site heterogeneity. center dot Aging degree and sorption behavior differ markedly between pyrochar and hydrochar.

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