Lian Shen-Hai, Zhang Shu-Nan, Liu Feng, Xing Hong-Lin, Wu Jin-Shui
Key Laboratory of Agro-ecological Processes in Subtropical Regions, Changsha Research Station for Agricultural and Environmental Monitoring, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China.
University of Chinese Academy of Sciences, Beijing 100049, China.
Huan Jing Ke Xue. 2022 Jul 8;43(7):3692-3698. doi: 10.13227/j.hjkx.202109156.
In order to understand the resource utilization of plant biomass, five types of biomass materials were used to produce biochar to treat wastewater containing phosphorus. The phosphorus adsorption capacity of five materials was preliminarily compared through laboratory experiments, and two materials with strong phosphorus adsorption capacity were screened out. The physicochemical characteristics of the selected biochar were analyzed using scanning electron microscopy and a BET specific surface area analyzer, and the effects of different pH values on phosphorus adsorption of the biochar were investigated. Furthermore, the phosphorus adsorption characteristics of the selected biochar were analyzed via isothermal adsorption and adsorption kinetics models. The results showed that among the five biochar materials, only rice straw and corn straw biochar had the ability to adsorb phosphorus. The Langmuir isothermal adsorption curve showed that the adsorption capacity of rice straw biochar for phosphorus in wastewater was stronger than that of corn straw biochar, and the theoretical maximum adsorption capacity was as follows:rice straw biochar (9.78 mg·g)>corn straw biochar (0.39 mg·g). The specific surface area (148.30 m·g) and total pore volume (0.11 cm·g) of rice straw biochar were much higher than those of corn straw biochar (8.26 m·g and 0.03 cm·g, respectively), and the contents of Mg, Ca, Fe, and Al were higher in rice straw biochar. The best pH for phosphorus adsorption of rice straw biochar and corn straw biochar was acidic. In different pH ranges (3.0-11.0), the phosphorus adsorption capacity of rice straw and corn straw biochar decreased with the increase in pH. These results indicated that rice straw biochar has strong phosphorus adsorption capacity and has a better application prospect in wastewater treatment.
为了解植物生物质的资源利用情况，使用了五种生物质材料制备生物炭以处理含磷废水。通过实验室实验初步比较了五种材料的磷吸附能力，筛选出两种磷吸附能力较强的材料。利用扫描电子显微镜和BET比表面积分析仪分析了所选生物炭的理化特性，并研究了不同pH值对生物炭磷吸附的影响。此外，通过等温吸附和吸附动力学模型分析了所选生物炭的磷吸附特性。结果表明，在五种生物炭材料中，只有稻草和玉米秸秆生物炭具有吸附磷的能力。Langmuir等温吸附曲线表明，稻草生物炭对废水中磷的吸附能力强于玉米秸秆生物炭，理论最大吸附量如下：稻草生物炭（9.78 mg·g）>玉米秸秆生物炭（0.39 mg·g）。稻草生物炭的比表面积（148.30 m·g）和总孔体积（0.11 cm·g）远高于玉米秸秆生物炭（分别为8.26 m·g和0.03 cm·g），且稻草生物炭中Mg、Ca、Fe和Al的含量更高。稻草生物炭和玉米秸秆生物炭吸附磷的最佳pH为酸性。在不同pH范围（3.0 - 11.0）内，稻草和玉米秸秆生物炭的磷吸附能力随pH升高而降低。这些结果表明稻草生物炭具有较强的磷吸附能力，在废水处理方面具有较好的应用前景。
