Effects of Calcium Modification on Alkaline Substances of Corn and Peanut Straw Biochar
Zhu Huixian
Dong Yanhong
Zhao Qingbin
Du Haiyan
Zhang Mengyang
Liu Xinwei
Song Xiangyun
Zhang Xiaoguang
Li Zengqiang
Abstract：Calcium-modified biochar was prepared by using corn and peanut straws as raw materials and CaCl2 as modifier.The effects of calcium modification on alkaline substances of the biochar were studied by an-alyzing the characteristics of elemental composition,alkaline substance content and functional group composi-tion.The results showed that the contents of carbon(C),nitrogen(N)and oxygen(O)in calcium-modified biochar decreased by 56.63％to 72.08％,69.50％to 79.28％and 51.78％to 97.15％,respectively(P＜0.05),but the C/N and H/C values increased significantly.The pH value and contents of total calcium,total magnesium,ash and ash alkali of calcium-modified biochar were increased by 4.39％to 8.02％,716.22％to 954.95％,18.66％to 42.26％,78.25％to 269.81％and 7.59％to 30.30％,respectively,compared to the unmodified biochar(P＜0.05).The results of X-ray energy spectrometer(EDS)and X-ray diffractometer(XRD)analyses showed that calcium had been successfully loaded on the modified biochar and new calcium-containing compounds appeared.The result of Fourier transform infrared spectroscopy(FTIR)analysis showed that calcium-modified biochar promoted the formation of aromatic functional groups and hydroxyl functional groups obviously.Correlation analysis showed that pH value was significantly positively correlated with contents of ash,total calcium and ash alkali;ash content was significantly positively correlated with contents of total calcium,total magnesium and ash alkalinity;pH value,ash content,total calcium content and ash alkali con-tent were significantly negatively correlated with C,N and O contents of the biochar.The results of the study indicated that calcium modification could increase the alkaline substance content of biochar by changing its properties,which had good potential for application in amending acidic soils.This conclusion could provide a theoretical basis for the application of calcium-modified biochar in the improvement of acidic soil.
Keywords：Calcium-modified biocharElemental compositionAlkaline substancesAsh contentFou-rier transform infrared spectroscopy(FTIR)
Publication Date：2025-10-30
Online Publishing Date：2026-05-22(First online date of this platform, not the publication date of the document)
Pages：8( 109-116 )