摘要
为查明钾硅钙矿物肥料复配稻壳生物炭对Cd^(2+)的吸附和土壤镉钝化特征,本研究用二者进行了吸附和淋滤实验。实验表明:钾硅钙矿物肥料和稻壳生物炭对Cd^(2+)理论最大吸附量分别为20.21 mg/g和6.72 mg/g,其余配比则介于二者之间;所有实验组都遵循Langmuir模型;生物炭遵循伪一级动力学模型,其余组合皆遵循伪二级动力学模型;pH在5~7的范围内有利于矿物肥料和人造沸石去除Cd^(2+);稻壳生物炭和钾硅钙矿物肥料复配于镉土壤污染产生钝化效果最优配比是7:3。
In order to find out the adsorption characteristics of Cd^(2+) and soil Cd passivation by rice husk biochar combined with potassium silica-calcium mineral fertilizer, the adsorption and leaching experiments were carried out. The experimental results showed that the theoretical maximum adsorption capacities of Cd^(2+) for potassium silica-calcium mineral fertilizer and rice husk biochar were 20.21 mg/g and 6.72 mg/g, respectively, and the other ratios were between them. All the experimental groups followed the Langmuir model. The biochar followed the pseudo-first-order kinetics model, while the other combinations followed the pseudo-second-order kinetics model. The removal of Cd^(2+) by mineral fertilizers and artificial zeolite was favorable when pH was in the range of 5~7. The optimal ratio of rice husk biochar and potassium silica-calcium mineral fertilizer to cadmium soil pollution for passivation effect was 7:3.
作者
董阳阳
施泽明
王新宇
杨旅涵
张峻基
DONG Yang-yang;SHI Ze-ming;WANG Xin-yu;YANG Lv-han;ZHANG Jun-ji(College of Earth Sciences,Chengdu University of Technology,Sichuan Chengdu 610059;Sichuan Tianshengyuan Environmental Protection Company Limited,Sichuan Chengdu 610036,China)
出处
《广州化工》
CAS
2022年第5期36-39,共4页
GuangZhou Chemical Industry
基金
国家自然科学基金(41373120,418077357)。
关键词
钾硅钙矿物肥料
生物炭
等温吸附
土壤淋滤
重金属钝化
potassium silicon calcium mineral fertilizer
biochar
adsorption
soil leaching
heavy metal passivation
