HuangFu Zhuoxi, Ran Zongxin, Mo Yinpeng, Xu Zichen, Wei Wei, Yu Jiang, Lai Bo, Wang Xingrun
Department of Environmental Science and Engineering, College of Architecture and Environment, Sichuan University No. 24 South Section 1, Yihuan Road Chengdu 610065 P. R. China
Institute of New Energy and Low Carbon Technology, Sichuan University Chengdu 610065 P. R. China.
RSC Adv. 2020 Oct 9;10(61):37419-37428. doi: 10.1039/d0ra06411d. eCollection 2020 Oct 7.
Waste organism blood (WOB) and orange peel are emerging stabilization materials obtained as by-products from agricultural processes, which are quite suitable for heavy metal immobilization in soil. In this work, waste organism blood and chemically modified orange peel (SOP) were investigated as potential sorbents for immobilization of available Cd in soil. Application of 5% WOB and SOP effectively immobilized cadmium (Cd) with an associated regulation of soil pH, among which the pH of acidic soil increased most significantly. While the application of 3% SOP alone stabilized almost the same amount of available Cd compared to WOB, it caused the highest stabilization rate of 58.85% when applied at 5%. By contrast, SOP combined with WOB (the mass ratio of the material is 1 : 1) at a 5% addition rate stabilized the available Cd in soils remarkably, with a stabilization rate of 57.74%. This study revealed that the soil particles after stabilization have a more compact and flaky structure, and the SOP and WOB had a particular pore structure, which was helpful for the adsorption of available Cd in soil. This study put forward new insights into the potential effects of Cd immobilization in contaminated soil by newly emerging stabilization biomass materials (WOB and SOP).
废弃生物血液（WOB）和橙皮是农业加工过程中产生的新兴稳定化材料副产物，非常适合用于土壤中重金属的固定。在本研究中，对废弃生物血液和化学改性橙皮（SOP）作为土壤中有效态镉固定的潜在吸附剂进行了研究。施用5%的WOB和SOP能有效固定镉（Cd），并伴随土壤pH值的调节，其中酸性土壤的pH值升高最为显著。虽然单独施用3%的SOP固定的有效态镉量与WOB相近，但在施用5%时其固定率最高，达58.85%。相比之下，以5%的添加率将SOP与WOB（材料质量比为1∶1）混合施用，能显著固定土壤中的有效态镉，固定率为57.74%。本研究表明，稳定化后的土壤颗粒结构更致密且呈片状，SOP和WOB具有特定的孔隙结构，有助于吸附土壤中的有效态镉。本研究为新兴稳定化生物质材料（WOB和SOP）在污染土壤中固定镉的潜在效果提供了新的见解。
