| 钟来元,廖荣骏,刘付宇杰,罗章奕.KOH改性花生壳生物炭对盐酸四环素的吸附性能及其机理[J].农业环境科学学报,2023,42(9):2038-2048. |
| KOH改性花生壳生物炭对盐酸四环素的吸附性能及其机理 |
| Adsorption of tetracycline hydrochloride by KOH modified peanut shell biochar and its mechanism |
| 投稿时间：2023-05-06 修订日期：2023-06-20 |
| DOI：10.11654/jaes.2023-0349 |
| 中文关键词: 花生壳 生物炭 KOH改性 盐酸四环素 吸附机理 |
| 英文关键词: peanut shell biochar alkali treatment tetracycline hydrochloride adsorption mechanism |
| 基金项目:国家自然科学基金项目（41371316）；广东海洋大学大学生创新创业训练计划项目（S202210566072） |
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| 中文摘要: |
| 以花生壳为原料、KOH为改性剂，考察碱改性工艺流程中的参数（热解温度、碱炭比和碱处理方式）对改性生物炭吸附盐酸四环素（TCH）的影响。通过吸附实验，以原状生物炭（BC600）为对照，探讨改性工艺参数的变化对吸附性能的影响。对生物炭进行扫描电镜（SEM）、能谱（EDS）、比表面积与孔径分析、傅里叶红外光谱（FTIR）、pHPZC等表征，探究生物炭对TCH的吸附机理。结果表明：碳化温度600℃、碱炭比2∶ 1、使用碱后处理-熔融法制备的改性生物炭（Post-MBC）对TCH去除能力最强。在25℃、pH=4的环境下，0.1 g的Post-MBC对40 mL 0.06 mg·mL-1的TCH去除率可达99.07%，Post-MBC对TCH的理论最大吸附量可达240.94mg·g-1（45℃）。Post-MBC的比表面积和微孔体积可达863.56 m2·g-1和0.26 cm3·g-1，KOH改性使生物炭的亲水性降低、表面带有负电荷，提高了对疏水性污染物和带正电荷污染物的吸附能力。生物炭的动力学模型更符合McKay方程，三种等温吸附模型的相关系数均较高。改性后的生物炭对TCH的吸附以化学吸附为主导，吸附过程吸热且自发进行。吸附机理包括孔隙填充作用、π-π相互作用、氢键作用、静电相互作用和疏水相互作用。 |
| 英文摘要: |
| In this study, peanut shell was used as raw material and KOH as a modifier to investigate the effects of parameters in the process of alkali modification, such as pyrolysis temperature, alkali-carbon ratio, and the alkali treatment procedure, on the adsorption properties of modified biochar to tetracycline hydrochloride(TCH). The adsorption experiments were carried out using pristine biochar(BC600)as a control, and the effect of parameter changes in the process of modification on adsorption performance was studied. The biochar was characterized by SEM, EDS, specific surface area and pore size analysis, FTIR, and pHpzc to unravel the adsorption mechanism of TCH by biochar. The results showed that modified biochar(Post-MBC)prepared by alkali post-treating-melting method at 600℃ with alkali-carbon ratio of 2:1 exhibited excellent TCH removal capacity. The removal rate of TCH in 40 mL solution of 0.06 mg·mL-1 reached 99.07% using 0.1 g Post-MBC at 25℃ and pH of 4. The theoretical maximum adsorption capacity of Post-MBC to TCH reached 240.94 mg·g-1 (45℃). The specific surface area and total micropore volume of Post-MBC reached 863.56 m2·g-1 and 0.26 cm3·g-1, respectively. The hydrophilicity of biochar modified by KOH was reduced, and the biochar carried negative charges on its surface. Consequently, its adsorption capacity was improved for hydrophobic and positively charged pollutants. The kinetic model of biochar accords with the McKay equation, and the fitting results of Langmuir, Freundlich, and Temkin isotherm models showed that all three models had high correlation coefficients. Chemisorption was the primary adsorption mode of modified biochar removing TCH, and the adsorption process was endothermic and spontaneous. The adsorption mechanism of modified biochar included pore filling, π-π interaction, hydrogen bonding, electrostatic interaction, and hydrophobic interaction. |
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