硒改性生物炭协同实现硒的安全利用及对重金属镉的抑制
Selenium-Modified Biochar Synergistically Achieves the Safe Use of Selenium and the Inhibition of Heavy Metal Cadmium.
作者信息
Wang Wanjing, Jiang Haiyan, Tan Zebin, Yu Luyao, Chen Jie, Xiao Qingliang, Rong Qinlei, Zhou Chunhuo
机构信息
College of Land Resources and Environment, Jiangxi Agricultural University, Nanchang 330045, China.
Key Laboratory of Crop Physiology, Ecology and Genetic Breeding, Ministry of Education, Nanchang 330045, China.
出版信息
Molecules. 2025 Jan 16;30(2):347. doi: 10.3390/molecules30020347.
To address cadmium pollution in China's cultivated land, chitosan, inorganic and organic selenium were used to modify rice husk charcoal for cadmium inhibition. Basic physicochemical properties of rice husk carbons were characterized (BET, FTIR, XRD, Zeta potential). Kinetic and isothermal adsorption experiments studied the adsorption of Cd by modified biochar under different pH and dosages. A350 and C350 had pore changes, and B350 had a smoother surface. The polarity and Zeta potential of A350, B350, and C350 differed. B350 and C350's kinetic adsorption fit the pseudo second order model, A350's fit both the pseudo first and second order. Their isothermal adsorption fit Langmuir (B350, C350) and Freundlich (A350). Intraparticle diffusion was three-stage with single-layer chemical adsorption. The pH increase raised removal and adsorption of CK350, A350, B350, and C350. The dosage increase hiked removal but cut unit adsorption. A350 had the highest max adsorption (57.845 mg/g). All modifications enhanced Cd adsorption, and the effect could be altered by adjusting pH and dosage.
为解决中国耕地中的镉污染问题，采用壳聚糖、无机硒和有机硒对稻壳炭进行改性以抑制镉。对稻壳炭的基本物理化学性质进行了表征（BET、FTIR、XRD、Zeta电位）。动力学和等温吸附实验研究了改性生物炭在不同pH值和剂量下对镉的吸附情况。A350和C350有孔隙变化，B350表面更光滑。A350、B350和C350的极性和Zeta电位不同。B350和C350的动力学吸附符合准二级模型，A350符合准一级和准二级模型。它们的等温吸附符合朗缪尔模型（B350、C350）和弗伦德里希模型（A350）。颗粒内扩散为具有单层化学吸附的三阶段过程。pH值升高提高了CK350、A350、B350和C350的去除率和吸附量。剂量增加提高了去除率，但降低了单位吸附量。A350的最大吸附量最高（57.845 mg/g）。所有改性均增强了对镉的吸附，且可通过调节pH值和剂量来改变效果。
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