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强奸草生物炭增强了Cd在被洪水淹没的水土壤中的固定,通过促进Fe和硫的转化促进了Cd的固定

Rui Yuan¹, Tianren Si¹, Qingquan Lu¹

¹Institute of Resources, Ecosystem and Environment of Agriculture, Nanjing Agricultural University, 1 Weigang, Nanjing, 210095, China; Jiangsu Collaborative Innovation Center for Solid Organic Waste Resource Utilization, China.

|July 26, 2023

概括

草生物炭 (RSB) 通过改变铁 (Fe) 转换和促进硫化物形成,增强了 (Cd) 在土中的固定. 较高的热解温度 (HB) 增加了Fe吸附,而较低的温度 (LB) 增加了硫化物对Cd不移性的贡献.

科学领域:

环境科学环境科学
土壤科学土壤科学
生物地质化学生物地质化学

背景情况:

被洪水淹没的土中的 (Cd) 污染通常与铁 (Fe) 氧化物和硫化物有关.
生物炭通过Fe转化和硫化物形成来增强Cd固定的确切机制尚不清楚.
在不同温度 (450°C - LB, 800°C - HB) 中化的强奸生物炭 (RSB) 对其对Cd固定效应进行了研究.

研究的目的:

为了阐明生物炭增强的Cd固定在米土壤中的机制.
为了研究生物炭衍生的Fe转化和硫化物形成在Cd固定化中的作用.
为了比较低温 (LB) 和高温 (HB) 生物炭对Cd固定化的有效性.

主要方法:

在Cd污染的土中添加1%和2%的RSB (LB和HB).
随着时间的推移,监测Fe/Mn氧化物-Cd,自由氧化物 (Fed),孔水中的Fe2+ (W-Fe2+),土壤电子转移速率,土壤pH,硫酸盐 (SO42-),以及酸挥发性硫化物度.
分析Cd分数,包括CaCl2可提取Cd,以评估固定性.

主要成果:

添加RSB,特别是HB,增强了氧化铁的减少,并促进了Fe矿物质的改制,增加了Fed度.
随着RSB的添加,土壤pH值增加,促进形成不良结晶的氧化铁 (FeO).
LB显著增加了硫酸盐和酸挥发性硫化物度,有助于Cd不运动,而HB增强了Cd在Fe矿物质中的吸附.

结论:

RSB,特别是HB,通过增强Fe氧化和再结晶来促进Cd固定,从而增加了Cd对Fe矿物质的吸附.
LB主要通过增加硫化物形成和硫酸盐度来增强Cd固定.
生物炭的应用代表了在受污染的土中固定Cd的可行策略,其机制取决于温度.

关键词:

Cd Cd Cd Cd 在线播放铁的再结晶化和再结晶化淹没的化场被淹没了强奸草生物碳硫化硫化物是一种硫化物.

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