| 杨创业,张鹏程,丁嘉雯,丁竹红.钛-镧/铈改性生物炭对水中头孢氨苄的去除[J].农业环境科学学报,2026,45(2):476-488. |
| 钛-镧/铈改性生物炭对水中头孢氨苄的去除 |
| Removal of cefalexin in water by titanium-lanthanum/cerium modified biochar |
| 投稿时间：2025-04-06 修订日期：2025-05-19 |
| DOI：10.11654/jaes.2025-0329 |
| 中文关键词: 抗生素 吸附 降解 双金属改性生物炭 |
| 英文关键词: antibiotic adsorption degradation bimetallic modified biochar |
| 基金项目:南京工业大学培育项目“废弃纸类碳化-改性的低成本炭纤维吸附剂制备及其吸附性能研究” |
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| 中文摘要: |
| 通过负载-二次热解的方法制备稀土元素镧/铈与钛共负载的复合改性生物炭材料（TiLaBC和TiCeBC），并将其应用于溶液中头孢氨苄（CEP）的去除。结果表明：镧和铈的负载显著增加了生物炭对CEP的吸附，钛负载量的增加显著增强了其对CEP的紫外光催化降解能力。在1 g·L-1的用量下，钛负载量为100 mg·g-1的钛-镧和钛-铈复合改性生物炭（TiLaBC100和TiCeBC100）对200mg·L-1 CEP的去除率分别为80.3%和83.1%。BET比表面积表征结果表明，TiLaBC100和TiCeBC100的比表面积分别为261 m2·g-1和186 m2·g-1，平均孔径为4.92 nm和4.88 nm。X射线光电子能谱表征结果表明，TiCeBC100表面铈以两种价态存在。两者对CEP的降解与紫外光照条件下活性氧自由基以及空穴的产生有关。CEP的初始浓度、改性生物炭用量、初始pH对吸附过程的影响大于对降解过程的影响，且初始pH对总去除效率的影响相对较小。磷的存在抑制TiLaBC100和TiCeBC100的吸附过程，但并未使光反应过程的去除效率降低。TiLaBC100和 TiCeBC100在复杂水质条件下对 CEP 的去除率降低，具备一定的抗干扰能力。TiLaBC100和TiCeBC100具备良好的循环利用性能，对植物幼苗几乎无毒害作用，具备较高的经济性和环境兼容性。研究表明，本实验制备的复合改性生物炭材料是一种具备吸附和光解双位点的具有经济性和环境兼容性的CEP的高效处理剂。 |
| 英文摘要: |
| Titanium-lanthanum and titanium-cerium composite biochars（TiLaBC and TiCeBC） were prepared through loading - secondary pyrolysis method and applied for the removal of cefalexin（CEP）in solution. The experimental results showed that the loading of lanthanum and cerium significantly increased the adsorption of CEP by biochar, and the increase in titanium loading amount significantly enhanced the UV catalytic degradation ability of biochar for CEP. At a dosage of 1 g·L-1, the titanium-lanthanum and titanium-cerium composite modified biochars prepared with a titanium loading of 100 mg·g-（1 TiLaBC100 and TiCeBC100）showed removal rates of 80.3% and 83.1% for 200 mg·L-1 CEP, respectively. BET characterization showed that the specific surface areas of TiLaBC100 and TiCeBC100 were 261 m2·g-1 and 186 m2·g-1, respectively, with average pore sizes of 4.92 nm and 4.88 nm. XPS characterization indicated that surficial cerium of TiCeBC100 existed in species with two different valences. The degradation of CEP by the two compositemodified biochars was related to the generation of reactive oxygen species and h+ under UV irradiation. The initial concentration of CEP, dosage of composite modified biochar and initial pH affected the adsorption process more significantly than the photocatalytic degradation process, but the initial pH had a relatively small effect on the total removal efficiency. The presence of phosphorus inhibited the adsorption process of composite modified biochar, but did not reduce the removal efficiency of the photocatalytic process. The removal rate of CEP by the composite modified biochars decreased under complex water quality conditions, but overall, the composite modified biochars had anti-interference ability. The composite modified biochar had good recycling performance, almost no toxic effect on plant seedlings, and high economic and environmental compatibility. Therefore, this study provides an efficient treatment agent for CEP with dual adsorption and photolysis sites, which is economical and environmentally compatible. |
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