改性大豆秸秆生物炭的制备及其对Pb(Ⅱ)的吸附性能  

Preparation of Modified Soybean Straw Biochar and Its Adsorption Performance on Pb(Ⅱ)

作　　者：燕翔 刘昕洋 司马红 刘慧霞 文田 余洁 宫峥嵘 张少飞 YAN Xiang;LIU Xinyang;SIMA Hong;LIU Huixia;WEN Tian;YU Jie;GONG Zhengrong;ZHANG Shaofei(Schoolof Agricultural and Forestry Technology,Longnan Normal College,Chengxian 742500,China;Lixian Rural Energy Management Station,Longnan City,Lixian 742200,China;Jishishan County Dahejia Middle School,Gansu Province Linxia Hui Autonomous Prefecture,Jishishan 731700,China;School of Bioengineering and Technology,Tianshui Normal University,Tianshui 741001,China)

机构地区：[1]陇南师范学院农林技术学院,甘肃成县742500 [2]甘肃省陇南市礼县农村能源管理站,甘肃礼县742200 [3]甘肃省临夏回族自治州积石山县大河家中学,甘肃积石山县731700 [4]天水师范学院生物工程与技术学院,甘肃天水741001

出　　处：《东莞理工学院学报》2025年第1期107-113,共7页Journal of Dongguan University of Technology

基　　金：甘肃省陇南市科技计划项目(2023-S·QKJ-36);甘肃省青年科技基金项目(21JR7RK915)。

摘　　要：以农林废弃物大豆秸秆为原料,采用微波-H_(2)O_(2)-超声耦合的方法,制备了改性大豆秸秆生物炭,并用红外光谱(FT-IR)、X射线衍射(XRD)和扫描电镜(SEM)技术对其结构形貌进行了表征分析。通过静态吸附试验,考察了pH、用量、温度、时间、初始浓度等因素对改性大豆秸秆生物炭吸附模拟废水中Pb(Ⅱ)性能的影响。结果表明,改性大豆秸秆生物炭具有丰富的椭圆形孔隙结构、C=O等含氧基团和芳香化结构。当模拟水样中Pb(Ⅱ)初始浓度为300 mg/L,pH=4.5,大豆秸秆生物炭用量为8.0 mg/L时,在温度为30℃、转速为150 r/min的条件下吸附120 min,大豆秸秆生物炭对Pb(Ⅱ)的吸附率达到94.8%,改性大豆秸秆生物炭对Pb(Ⅱ)吸附过程符合拟二级吸附模型线性方程。大豆秸秆生物炭对Pb(Ⅱ)吸附机理为表面孔径吸附、离子交换吸附、络合吸附及静电吸附等多种作用。Modified soybean straw biochar was prepared from agricultural and forestry waste soybean straw by Microwave-H_(2)O_(2)-Ultrasound coupling,and its structure and morphology were characterized and analyzed by infrared spectroscopy(FT-IR),X-ray diffraction(XRD)and scanning electron microscopy(SEM)techniques.The adsorption performance of modified soybean straw biochar on Pb(Ⅱ)in simulated water samples was investigated by static adsorption test.The results showed that the modified soybean straw biochar has abundant elliptical pore structure,oxygen-containing groups such as C=O and aromatized structure.When the initial concentration of Pb(Ⅱ)in the simulated water sample was 300 mg/L,pH=4.5,and the dosage of SSB was 8.0 mg/L,and the adsorption rate of soybean straw biochar on Pb(Ⅱ)reached 94.8%after 120 min of adsorption at the temperature of 30℃and the rotational speed of 150 r/min.The adsorption of Pb(Ⅱ)by modified soybean straw biochar conformed to the linear equations of the proposed secondary adsorption model.The adsorption mechanism of soybean straw biochar on Pb(Ⅱ)was characterized by surface pore adsorption,ion exchange,complexation and electrostatic attraction.

关 键 词：大豆秸秆 微波 H_(2)O_(2) 耦合改性 Pb(Ⅱ) 

分 类 号：TQ424[化学工程] X53[环境科学与工程—环境工程]