ABSTRACT

The effect of three plant biomasses and two pyrolysis temperatures were investigated on physical and structural properties of biochar. Biochars produced from woody species (lantana and pine needles) had higher mass yields (18.5%–47.8%), C (599.8–623.2 g kg⁻¹), N (8.6–15.4 g kg⁻¹), humin-like C component (486.8–536.4 mg g⁻¹), B (14.5–42.5 mg kg⁻¹) and Mo (1.3–2.4 mg kg⁻¹) contents than wheat straw biochar. Wheat straw biochar had higher ash content (23.01%–36.14%), specific density (1.45–1.70 g cc⁻¹), surface area (295.0–397.4 m² g⁻¹), O (672.1–753.2 g kg⁻¹) content and CEC (0.93–1.43 m.e. g⁻¹) compared to biochars from woody species. Compared to 300°C pyrolysis temperature of 450°C significantly increased apparent- and specific-density, ash content, pH, EC, O, P, K, water-soluble C, fulvic acid-like C, humic acid-like C, and carbonyl group contents and the content of all micronutrients except Mo, but decreased mass yield, surface area and the contents of humin-like C and some O-containing functional groups and CEC. The interaction effect between biomass sources and temperature influenced all investigated properties of biochars except H, N, S, Cu, Mo and C:N contents. Different carbon components and functional groups in biochar were correlated with biochar properties.

摘要

研究了三种植物生物质和两种热解温度对生物炭物理和结构特性的影响。由木本植物（马缨丹和松针）生产的生物炭具有更高的质量产量（18.5%–47.8%）、C（599.8–623.2 g kg ^-1）、N（8.6–15.4 g kg ^-1）、类腐殖质 C 组分(486.8–536.4 mg g ^-1 )、B (14.5–42.5 mg kg ^-1 ) 和 Mo (1.3–2.4 mg kg ^-1 ) 含量高于麦秸生物炭。小麦秸秆生物炭具有较高的灰分含量（23.01%–36.14%）、比密度（1.45–1.70 g cc ^-1）、表面积（295.0–397.4 m ²  g ^-1）、O（672.1–753.2 g kg ^-1）含量和 CEC (0.93–1.43 me g ^-1) 与来自木本物种的生物炭相比。与 450°C 的 300°C 热解温度相比，表观密度和比密度、灰分含量、pH、EC、O、P、K、水溶性 C、类黄腐酸 C、类腐植酸 C、羰基含量和除 Mo 以外的所有微量营养素的含量，但质量产量、表面积和类腐殖质 C 和一些含 O 官能团和 CEC 的含量降低。除了 H、N、S、Cu、Mo 和 C:N 含量外，生物质来源和温度之间的相互作用影响了生物炭的所有研究性质。生物炭中不同的碳组分和官能团与生物炭性质相关。