Wang Dongfang, Zhang Guilong, Zhou Linglin, Cai Dongqing, Wu Zhengyan
University of Science and Technology of China , 96 Jinzhai Road, Hefei, Anhui 230026, People's Republic of China.
J Agric Food Chem. 2017 Oct 18;65(41):8999-9005. doi: 10.1021/acs.jafc.7b02370. Epub 2017 Oct 4.
Livestock manure (Man) commonly contains a certain quantity of heavy metal ions, such as arsenic (As) and copper (Cu) ions, resulting in a high risk on soil contamination. To solve this problem, heavy metal of manure was immobilized into sodium carbonate/biosilica/attapulgite composite (NaCO/BioSi/Attp), which was developed using a nanocomposite consisting of anhydrous sodium carbonate (NaCO), straw ash-based biochar and biosilica (BioSi), and attapulgite (Attp). When NaCO/BioSi/Attp was mixed with Man/AsCu, the obtained nanocomposite (NaCO/BioSi/Attp/Man/AsCu) with a porous nano-network structure could effectively control the release of As and Cu ions from manure through adsorption and chemical reaction. Meanwhile, a pot experiment indicated that NaCO/BioSi/Attp/Man/AsCu could increase the pH value of acid soil, promote the growth of rice, and significantly decrease the uptake of As and Cu ions by rice. Therefore, this work provides a promising approach to immobilize heavy metal ions in manure and, thus, lower the contamination risk to the environment. NaCO, BioSi, and Attp powders were mixed evenly with a weight ratio of W/W/W = 3:1:2.
畜禽粪便（Man）通常含有一定量的重金属离子，如砷（As）和铜（Cu）离子，导致土壤污染风险较高。为解决这一问题，将粪便中的重金属固定在碳酸钠/生物硅/凹凸棒石复合材料（NaCO/BioSi/Attp）中，该复合材料是由无水碳酸钠（NaCO）、秸秆灰基生物炭和生物硅（BioSi）以及凹凸棒石（Attp）组成的纳米复合材料制备而成。当NaCO/BioSi/Attp与Man/AsCu混合时，所得到的具有多孔纳米网络结构的纳米复合材料（NaCO/BioSi/Attp/Man/AsCu）能够通过吸附和化学反应有效控制粪便中As和Cu离子的释放。同时，盆栽试验表明，NaCO/BioSi/Attp/Man/AsCu能够提高酸性土壤的pH值，促进水稻生长，并显著降低水稻对As和Cu离子的吸收。因此，这项工作为固定粪便中的重金属离子提供了一种有前景的方法，从而降低对环境的污染风险。NaCO、BioSi和Attp粉末按重量比W/W/W = 3:1:2均匀混合。
