Tobacco Waste Liquid-Based Organic Fertilizer Particle for Controlled-Release Fulvic Acid and Immobilization of Heavy Metals in Soil
Dongfang Wang,
Jiangshan Li,
Xia Yao,
Qingchuan Wu,
Jing Zhang,
Jinghong Ye,
He Xu,
Zhengyan Wu,
Dongqing Cai
Affiliations
Dongfang Wang
College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China
Jiangshan Li
College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China
Xia Yao
College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China
Qingchuan Wu
Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China
Jing Zhang
College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China
Jinghong Ye
College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China
He Xu
College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China
Zhengyan Wu
Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei 230031, China
Dongqing Cai
College of Environmental Science and Engineering, Donghua University, Shanghai 201620, China
Every year, a large amount of tobacco waste liquid (TWL) is discharged into the environment, resulting in serious pollution for the environment. In this work, a TWL-based particle (OACT) was fabricated by CaO, attapulgite (ATP), and TWL, and, then, OACT was coated by amino silicon oil (ASO) to form OACT@ASO. Therein, OACT@ASO had high controlled-release ability for fulvic acid (FA), because of the nanonetworks structure for ATP and the high content of FA in TWL. The release ratio (RR) of FA from OACT@ASO reached 94% at 75 h in deionized water, and 23% at 32 d in silica sand. Furthermore, the release mechanism of FA from OACT@ASO was consistent with the First-order law. Additionally, OACT@ASO also possessed high immobilization capacity for Cu(II), Cd(II), and Pb(II) (CCP) in soil. Notably, a pot experiment indicated that OACT@ASO could facilitate the growth of pakchoi seedlings and decrease the absorption of CCP by pakchoi seedlings. Thus, this study provides a new kind of organic fertilizer which could not only release FA, but also immobilize CCP in soil.
