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[1] TAN Chaoqun, HU Jun, XU Ying, WANG Xuan, et al. Kinetic adsorption of humic acid by nitrogen-doped food waste hydrogel biochar [J]. Journal of Southeast University (English Edition), 2025, 41 (3): 348-355. [doi:10.3969/j.issn.1003-7985.2025.03.010]
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Kinetic adsorption of humic acid by nitrogen-doped food waste hydrogel biochar()
掺氮改性厨余垃圾水凝胶生物炭吸附腐殖酸动力学研究
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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:
41
Issue:
2025 3
Page:
348-355
Research Field:
Environmental Science and Engineering
Publishing date:
2025-09-11

Info

Title:
Kinetic adsorption of humic acid by nitrogen-doped food waste hydrogel biochar
掺氮改性厨余垃圾水凝胶生物炭吸附腐殖酸动力学研究
Author(s):
TAN Chaoqun1, HU Jun1, XU Ying1, WANG Xuan1, LIN Xiaochuan1, LI Peng2, SU Lianghu2
1.School of Civil Engineering, Southeast University, Nanjing 211189, China
2.Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China
谈超群1, 胡军1, 徐颖1, 王宣1, 林小川1, 李鹏2, 苏良湖2
1.东南大学土木工程学院，南京 211189
2.生态环境部南京环境科学研究所，南京 210042
Keywords:
food waste;  modified biochar;  humic acid;  adsorption mechanism
厨余垃圾; 改性生物炭; 腐殖酸; 吸附机理
PACS:
X131.2
DOI:
10.3969/j.issn.1003-7985.2025.03.010
Abstract:
Food waste, owing to its high organic content and moisture, offers a more scientifically sound resource utilization method compared to traditional treatment processes. This study presents a method to convert food waste into nitrogen-doped, modified hydrogel biochar modified food waste hydrogel biochar and investigates its effectiveness in adsorbing humic acid (HA). The modified biochar demonstrates superior adsorption capacity for HA compared to unmodified biochar. The adsorption follows the Langmuir isotherm model (R2 = 0.999), achieving a maximum adsorption capacity of 49.5 mg/g with RL = 0.001 3-0.005 1 (0 < RL < 1). Furthermore, the adsorption process conforms to a pseudo-first-order model. The mechanism underlying HA adsorption involves the successful modification of food waste hydrogel biochar by 3-Aminopropyltriethoxysilane (APTES). This modification forms Si—R—NH3+undefinedundefined on the biochar surface, which interacts with the COOH— groups in HA through hydrogen bonding and coordination bonds. Some unmodified APTES directly adsorbs onto the biochar surface, undergoing condensation and self-assembly to form ladder-like oligomeric siloxane polymers that enhance HA adsorption.
由于厨余垃圾具有高有机质、高含水率的特点，相对于传统处理工艺，厨余垃圾的再利用是更为科学的资源化处置方法。本文提出一种将厨余垃圾转化为掺氮改性厨余垃圾水凝胶生物炭的利用方法，并研究改性生物炭对腐殖酸（HA）的吸附效果的影响及吸附机理。该生物炭对于HA的吸附能力优于未改性前的生物炭，且吸附符合Langmuir等温模型（R2 = 0.999），最大吸附能力为49.5 mg/g，RL = 0.001 3 ~ 0.005 1 （0 <RL <1），符合拟一阶模型。材料吸附HA的机理是3‑氨基丙基三乙氧基硅烷（APTES）成功修饰了厨余垃圾水凝胶生物炭，在表面生成Si—R—NH3+undefinedundefined，Si—R—NH3+undefinedundefined通过与HA的COOH—形成氢键和配位键结合进行吸附，部分未修饰成功的APTES直接吸附在材料表面，进行缩合自组装形成阶梯状低聚物硅氧烷聚合物，以此吸附HA。

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Memo

Memo:
Received 2024-08-09,Revised 2024-12-20.
Biography:Tan Chaoqun (1989—), male, doctor, associate professor, tancq@seu.edu.cn; Su Lianghu (corresponding author), male, doctor, research fellow, sulianghu@nies.org.
Foundation items:The National Natural Science Foundation of China (No.52470216), the Natural Science Foundation of Jiangsu Province (No. BK20211175).
Citation:TAN Chaoqun,HU Jun,XU Ying,et al.Kinetic adsorption of humic acid by nitrogen-doped food waste hydrogel biochar[J].Journal of Southeast University (English Edition),2025,41(3):348-355.DOI:10.3969/j.issn.1003-7985.2025.03.010.DOI:10.3969/j.issn.1003-7985.2025.03.010
Last Update: 2025-09-20