Cadmium adsorption on plant- and manure-derived biochar and biochar-amended sandy soils: impact of bulk and surface properties.
Cadmium adsorption on plant- and manure-derived biochar and biochar-amended sandy soils: impact of bulk and surface properties.
复制标题
DOI：
10.1016/j.chemosphere.2014.04.043
复制
发表时间：
2014-09
期刊：
影响因子：
8.8
通讯作者：
Dongyu Xu;Ye Zhao;Ke Sun;Bo Gao;Ziying Wang;Jie Jin;Zheyun Zhang;Shui-feng Wang;Yu Yan
中科院分区：
文献类型：
--
作者：
Dongyu Xu;Ye Zhao;Ke Sun;Bo Gao;Ziying Wang;Jie Jin;Zheyun Zhang;Shui-feng Wang;Yu Yan
为研究生物质炭和生物质炭改良土壤的体相和表面组成在吸附Cd 2+中的作用，以及不同生物质炭添加到土壤中对Cd 2+吸附的影响，在300、450和600 °C下制备了猪粪源生物质炭（BS）和小麦秸秆源生物质炭（BW）。将这些生物炭添加到桑迪土壤中，研究其对土壤吸附Cd 2+的影响。显著较高的表面碳含量的修正土壤相比，其散装C含量表明，矿物的生物炭修正土壤最有可能主要由生物炭覆盖。由于BS的高极性和灰分含量，BS的最大吸附容量（Qmax，总）比BW高10-15倍。低温生物炭的极性（（N + O）/C）对其吸附Cd 2+有较大影响。BS处理土壤的Qmax，total随剂量的增加而增加，BW处理土壤的Qmax，total随剂量的增加而增加，这是由于两种土壤的表面组成特征不同所致。BS在土壤中的固定Cd 2+的效果优于BWs。本研究阐明了生物炭的空间分布在生物炭改良土壤，并强调了Cd 2+吸附的调查样品的表面组成的重要性。
To investigate the role of the bulk and surface composition of both biochar and biochar-amended soils in the adsorption of Cd2+, as well as the influence of different biochars added to the soils on Cd2+adsorption, swine-manure-derived biochars (BSs) and wheat-straw-derived biochars (BWs) were produced at 300, 450, and 600 °C. These biochars were added to a sandy soil to investigate the effect of biochars on the adsorption of Cd2+by soil. The significantly higher surface C content of the amended soils compared to their bulk C content suggests that the minerals of the biochar-amended soils are most likely covered primarily by biochars. The maximum adsorption capacity (Qmax,total) of the BSs was 10–15 times higher than that of the BWs due to the high polarity and ash content of the BSs. The polarity ((N + O)/C) of the low-temperature biochars greatly affected their Cd2+adsorption. TheQmax,totalof the BS-amended soils increased with increasing dose, whereas theQmax,totalof the BW-amended soils showed the opposite behavior, which was attributed to the different surface composition characteristics of the two types of soil. The BSs were more effective in immobilizing Cd2+upon application to the soil relative to the BWs. This study elucidates the spatial distribution of biochars in biochar-amended soils and highlights the importance of the surface composition of the investigated samples in Cd2+adsorption.