Li Qin, Zhan Cong, Gui Shuang-Lin, Deng Tong-Hui, Jia Zhuo
Jiangxi Provincial Key Laboratory of Greenhouse Gas Accounting and Carbon Reduction, Institute of Energy Research, Jiangxi Academy of Sciences, Nanchang 330096, China.
Jiangxi Carbon Neutralization Research Center, Nanchang 330096, China.
Huan Jing Ke Xue. 2025 Aug 8;46(8):5379-5390. doi: 10.13227/j.hjkx.202406197.
To solve the problem of phosphate pollution in water and achieve the resource utilization of livestock and poultry manure biomass, swine manure was selected as the raw material to prepare biochar. The composition and structure of SMBC700 were characterized using elemental analysis, specific surface area analysis, and FTIR. The adsorption isotherm model and adsorption kinetics model were used to fit the phosphate adsorption characteristics of swine manure biochar, and the effects of pyrolysis temperature, biochar dosing, initial solution pH, and coexisting ions on phosphate adsorption by biochar were studied. The conditions affecting phosphate adsorption were optimized by response surface methodology （RSM）. The results showed that only SMBC700 could adsorb phosphate. The phosphate adsorption capacity of SMBC700 reached 6.127 1 mg·g at a SMBC700 dosage of 2 g·L and the initial phosphate concentration of 20 mg·L. The adsorption isotherm and kinetics were better fitted by the Langmuir isotherm model and the pseudo second-order kinetics. SMBC700 exhibited an excellent performance for phosphate adsorption over a wide pH range （3-12）. The coexistence of HCO could significantly weaken the adsorption capacity of SMBC700 to phosphate. The optimum conditions for phosphate adsorption by SMBC700 were obtained by RSM analysis with a dosage of 3 g·L, an initial phosphate concentration of 30 mg·L, and a pH of 7.0. The possible mechanisms of phosphate adsorption by SMBC700 included electrostatic adsorption, ligand exchange, and pore filling.
为解决水体磷污染问题并实现畜禽粪便生物质的资源利用，选取猪粪作为原料制备生物炭。采用元素分析、比表面积分析和傅里叶变换红外光谱（FTIR）对SMBC700的组成和结构进行了表征。利用吸附等温线模型和吸附动力学模型拟合猪粪生物炭对磷的吸附特性，研究了热解温度、生物炭投加量、初始溶液pH值和共存离子对生物炭吸附磷的影响。采用响应面法（RSM）优化影响磷吸附的条件。结果表明，只有SMBC700能够吸附磷。在SMBC700投加量为2 g·L、初始磷浓度为20 mg·L时，SMBC700对磷的吸附量达到6.127 1 mg·g。吸附等温线和动力学分别用Langmuir等温线模型和准二级动力学能更好地拟合。SMBC700在较宽的pH范围（3 - 12）内对磷表现出优异的吸附性能。HCO的共存会显著削弱SMBC700对磷的吸附能力。通过RSM分析得到SMBC700吸附磷的最佳条件为投加量3 g·L、初始磷浓度30 mg·L、pH值7.0。SMBC700吸附磷的可能机制包括静电吸附、配体交换和孔隙填充。
