College of Environmental Science and Engineering, China West Normal University, Nanchong, Sichuan 637009, China; Key Laboratory of Nanchong City of Ecological Environment Protection and Pollution Prevention in Jialing River Basin, Nanchong, Sichuan 637009, China.
College of Environmental Science and Engineering, China West Normal University, Nanchong, Sichuan 637009, China.
Int J Biol Macromol. 2024 Oct;278(Pt 2):134768. doi: 10.1016/j.ijbiomac.2024.134768. Epub 2024 Aug 14.
In this study, starch (S) was gelatinized and carbonized to prepare carbonized/gelatinized S (CGS) as the research material. Then, peat extract (Pe) and surfactants with different ratios were single- and multi-modified on CGS, respectively, to prepare Pe-modified CGS (Pe-CGS) and multi-modified CGS, respectively. The microscopic morphology of multi-modified CGS was studied using various testing methods. The de-risking effect on Cd(II) and hymexazol in wastewater was investigated, and the effects of temperature, pH, and ionic strength were compared. The spheroidal structure of S was destroyed after carbonization, and Pe and surfactants were modified on the surface and changed the surface properties of CGS. The adsorption processes of Cd(II) and hymexazol were suitable to be described by the Langmuir and Freundlich models, respectively. The maximum adsorption capacities (q) of Cd(II) and adsorption capacity parameter (k) of hymexazol on different modified CGSs presented the peak value at BS/Pe-CGS. With the increase in the modification ratio of Pe, BS, and SDS, q and k increased, which showed a high value at 100 % modification. Increases in temperature and pH were beneficial to Cd(II) adsorption but were not conducive to hymexazol adsorption. The adsorption amount decreased for Cd(II) and increased first and then reduced for hymexazol with the rise in ionic strength. The adsorption process exhibited spontaneity, endothermic behavior for Cd(II), exothermic behavior for hymexazol, and an entropy-increasing reaction. The adsorption amount of Cd(II) and hymexazol by multi-modified CGS maintained approximately 81 % of the original sample after three rounds of regeneration.
在这项研究中，淀粉（S）被糊化和碳化，以制备碳化/糊化 S（CGS）作为研究材料。然后，分别用不同比例的泥炭提取物（Pe）和表面活性剂对 CGS 进行单修饰和多修饰，分别制备 Pe 修饰的 CGS（Pe-CGS）和多修饰的 CGS。使用各种测试方法研究了多修饰 CGS 的微观形貌。考察了其对废水中 Cd(II)和 hymexazol 的风险降低效果，并比较了温度、pH 值和离子强度的影响。碳化后 S 的球晶结构被破坏，Pe 和表面活性剂被修饰在表面上，改变了 CGS 的表面性质。Cd(II)和 hymexazol 的吸附过程分别适合用 Langmuir 和 Freundlich 模型来描述。不同修饰的 CGS 上 Cd(II)的最大吸附容量（q）和 hymexazol 的吸附容量参数（k）在 BS/Pe-CGS 处呈现峰值。随着 Pe、BS 和 SDS 修饰比例的增加，q 和 k 增加，在 100%修饰时达到最大值。升高温度和 pH 值有利于 Cd(II)的吸附，但不利于 hymexazol 的吸附。随着离子强度的增加，Cd(II)的吸附量减少，而 hymexazol 的吸附量先增加后减少。吸附过程表现为自发的、Cd(II)为吸热的、hymexazol 为放热的、熵增加的反应。多修饰 CGS 对 Cd(II)和 hymexazol 的吸附量在经过三轮再生后仍保持原始样品的约 81%。
