Effect of pyrolysis temperature on sulfur content, extractable fraction and release of sulfate in corn straw biochar

• DOI: 10.1039/c8ra06382f
• Publication Date: 2018-10-18T08:44:00Z
• Authors: Baowei Zhao; Huan Xu; Tao Zhang; Xujun Nan; Fengfeng Ma
• Keywords: Fraction (chemistry); Charcoal

The contents and release of the nutrient elements N, P K in biochars have been investigated. Sulfur is an indispensable element for plants, but its content biochar are still unclear. effect pyrolysis temperature (300, 500 700 °C) on sulfur content, extractable fraction sulfate corn straw (CS300, CS500 CS700) was were characterized using analysis, BET, FTIR, XRD. It shown that decreased significantly with increasing temperature. extraction results indicated percentages water extractable-sulfate (W-SO4 2-) organosulfur while those HCl- NaH2PO4-extractable (HCl-SO4 2-, NaH2PO4-SO4 increased Batch experiments conducted to test contact time addition Hoagland solution (HNS) from biochars. kinetics fitted well a pseudo-second-order model. Approximately 10.7 mg g-1 released CS300 during initial 2 h, whereas 6.32 3.93 CS700, respectively. Increasing amounts HNS led negative effects release. indicate low-temperatures might be optimal producing improve fertilization.