Characteristics of Phosphorus Adsorption in Aqueous Solution by Si-modified Peanut Shell Biochar

被引：3
|
作者：
Zhao M. [1 ]
Zhang X.-P. [1 ,2 ,3 ,4 ]
Wang L.-R. [5 ]
机构：
[1] School of Environment and Energy, South China University of Technology, Guangzhou
[2] Key Laboratory of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of Education, Guangzhou
[3] Guangdong Provincial Key Laboratory of Solid Wastes Pollution Control and Recycling, Guangzhou
[4] Guangdong Provincial Engineering and Technology Research Center for Environmental Risk Prevention and Emergency Disposal, Guangzhou
[5] Guangdong Suchun Environmental Protection Technology Co., Ltd., Dongguan
来源：
Huanjing Kexue/Environmental Science | 2021年 / 42卷 / 11期
关键词：
Biochar; Calcium carbonate; Peanut shell(PS); Phosphorus(P); Silica;
D O I：
10.13227/j.hjkx.202103012
中图分类号：
学科分类号：
摘要：
In this work, a novel sodium silicate-modified peanut shell biochar(Si-PSB)was synthesized and used as phosphorus adsorbents. Compared with unmodified biochar(PSB), the adsorption capacity of Si-PSBs increased significantly. The adsorption capacity of 8% sodium silicate solution modified biochar(8%Si-PSB)was 3.9 times higher than that of PSB. The biochar was characterized using scanning electron microscopy(SEM), Fourier transformed infrared(FTIR), and X-ray diffraction(XRD), which confirmed that silica was present on the surface of 8%Si-PSB. The introduction of silica improved the reaction activity of biochar's own metal ions by affecting the morphology of calcium carbonate. The 8%Si-PSB had a good adsorption effect on phosphorus in both acid and alkali environments. Phosphorus adsorption by 8%Si-PSB and PSB was described well by the pseudo-second-order model, and the adsorption capacity after equilibrium fluctuated between 2.79 mg•g-1 and 0.71 mg•g-1, respectively. Further, the isothermal adsorption experimental data fitted well to the Langmuir model. The presence of humic acid in the solution inhibited the adsorption of phosphorus by the 8%Si-PSB and PSB. The 8%Si-PSB, as a new low-cost phosphorus removal material, can improve the utilization of metal ions in peanut shell itself. © 2021, Science Press. All right reserved.
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页码：5433 / 5439
页数：6
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