Li Xingqun, Yuan Junjie, Zhu Yao, Wang Ke, Wang Jizhang, Zhang Tao, Qiu Fengxian
School of Agricultural Engineering, Jiangsu University, Zhenjiang 212013, China.
School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, China.
Langmuir. 2025 Aug 5;41(30):20237-20247. doi: 10.1021/acs.langmuir.5c02547. Epub 2025 Jul 24.
Agricultural advancement boosts food production and economic growth but also causes solid waste and phosphorus pollution. Using agricultural waste to tackle pollution is a sustainable way to reduce environmental harm and promote resource recycling. In this study, lanthanum (La)-based metal-organic frameworks (MOFs) utilizing terephthalic acid (BDC) and 1,3,5-benzenetricarboxylic acid (BTC) as linkers─referred to as La-BDC MOF and La-BTC MOF, respectively─were synthesized on agricultural waste in the form of rapeseed pollen (PL) biomass, resulting in a refined support with enhanced functionality. A variety of advanced instrumental techniques were employed to investigate the formation of PL@La-BDC MOF and PL@La-BTC MOF. The maximum adsorption densities of PO achieved under optimal conditions were recorded at 35.8 mg/g for PL@La-BDC MOF (pH 6.0, 25 °C) and 39.4 mg/g for PL@La-BTC MOF (pH 9.0, 35 °C). These values significantly surpass those reported for previously developed La-based adsorbents. The adsorption processes are best described by the pseudo-second-order model, indicating that chemisorption is the predominant mechanism. The presence of PO on both the PL@La-BDC MOF and PL@La-BTC MOF following the adsorption process was verified through FT-IR and XPS analyses. In the case of PL@La-BDC MOF, the primary mechanism involves phosphorus anions in solution displacing hydroxyl groups that are coordinated to the central metal, La, through a ligand exchange process coupled with electrostatic attraction. For PL@La-BTC MOF, the main mechanisms involve electrostatic interactions and the chemisorption of carboxyl groups associated with the phosphorus. Moreover, both materials possess enhanced selective adsorption capabilities for phosphorus and exhibit robust anti-interference properties. This work presents an effective and eco-friendly biomass adsorbent for efficient phosphorus adsorption in solutions. It provides insights for utilizing agricultural waste in environmental remediation, enhancing the practical application of natural waste materials.
农业进步促进了粮食生产和经济增长，但也造成了固体废物和磷污染。利用农业废弃物治理污染是减少环境危害和促进资源循环利用的可持续方式。在本研究中，分别以对苯二甲酸（BDC）和1,3,5-苯三甲酸（BTC）为连接体的镧（La）基金属有机框架材料（MOF）——分别称为La-BDC MOF和La-BTC MOF——以油菜花粉（PL）生物质的形式在农业废弃物上合成，从而得到了功能增强的精制载体。采用了多种先进的仪器技术来研究PL@La-BDC MOF和PL@La-BTC MOF的形成。在最佳条件下，PL@La-BDC MOF（pH 6.0，25℃）对磷的最大吸附密度记录为35.8 mg/g，PL@La-BTC MOF（pH 9.0，35℃）为39.4 mg/g。这些值显著超过了先前开发的镧基吸附剂所报道的值。吸附过程最好用伪二级模型来描述，这表明化学吸附是主要机制。通过傅里叶变换红外光谱（FT-IR）和X射线光电子能谱（XPS）分析验证了吸附过程后PL@La-BDC MOF和PL@La-BTC MOF上磷的存在。对于PL@La-BDC MOF，主要机制涉及溶液中的磷阴离子通过配体交换过程和静电吸引取代与中心金属La配位的羟基。对于PL@La-BTC MOF，主要机制涉及静电相互作用和与磷相关的羧基的化学吸附。此外，这两种材料对磷都具有增强的选择性吸附能力，并表现出强大的抗干扰性能。这项工作展示了一种用于溶液中高效磷吸附的有效且环保的生物质吸附剂。它为在环境修复中利用农业废弃物提供了见解，增强了天然废料的实际应用。
