Chawraba Khaled, El Malti Wassim, Akil Assil, Hamieh Malak, Hammoud Mohammad, Patra Digambara, Toufaily Joumana, Hijazi Akram
Laboratory of Materials, Catalysis, Environment and Analytical Methods (MCEMA), LEADDER, Faculty of Sciences, Lebanese University, Hadath P.O. Box 6573, Lebanon.
Doctoral School of Science and Technology, Research Platform for Environmental Science (PRASE), Lebanese University, Beirut P.O. Box 6573, Lebanon.
ACS Omega. 2025 Jun 6;10(23):24847-24861. doi: 10.1021/acsomega.5c02046. eCollection 2025 Jun 17.
This study explores the potential ofAcacia Ataxacantha-(Acacia) biomass as a low-cost and effective biosorbent for removing methylene blue dye (MB) and ciprofloxacin antibiotic (CIP) from water. The biosorbent was thoroughly characterized using FTIR, BET, SEM-EDX, XRD, and TGA-DTG, confirming the presence of key functional groups (-OH, -COOH). Optimal removal was achieved at room temperature, pH 7, and a biomass dosage of 2 g/L, with short equilibrium times of 30 min for MB and 5 min for CIPfaster than many conventional adsorbents. Isotherm analysis revealed that MB adsorption followed the Temkin model, whereas CIP conformed to the Langmuir model. The latter model showed maximum adsorption capacities of 133 mg/g for MB and 171 mg/g for CIP, which are comparable to or better than those of other biosorbents. The surface coverage at 25 °C was 36% for MB and 32% for CIP, indicating partial site utilization. Kinetic studies indicated that the adsorption process fits a pseudo-second-order model. Activation energy calculations yielded 34.5 kJ/mol for MB and -23.0 kJ/mol for CIP, indicating distinct adsorption mechanisms. Thermodynamic analysis confirmed that both adsorption processes were exothermic and spontaneous at 25 °C, with MB showing stronger interaction energy than CIP. A basic cost analysis estimated the production cost of 1 kg of Acacia biosorbent at 1.54 USD. Regeneration tests showed good reusability for up to four cycles for both MB and CIP. These results suggest that Acacia is a cost-effective and sustainable biosorbent for removing MB and CIP from water, offering a practical alternative to energy-intensive treatment methods.
本研究探讨了阿拉伯金合欢（Acacia Ataxacantha）生物质作为一种低成本且高效的生物吸附剂，用于从水中去除亚甲基蓝染料（MB）和环丙沙星抗生素（CIP）的潜力。使用傅里叶变换红外光谱（FTIR）、比表面积分析仪（BET）、扫描电子显微镜-能谱仪（SEM-EDX）、X射线衍射仪（XRD）和热重-微商热重联用仪（TGA-DTG）对该生物吸附剂进行了全面表征，证实了关键官能团（-OH、-COOH）的存在。在室温、pH值为7以及生物质剂量为2 g/L的条件下实现了最佳去除效果，MB的平衡时间为30分钟，CIP的平衡时间为5分钟，比许多传统吸附剂更快。等温线分析表明，MB的吸附遵循Temkin模型，而CIP符合Langmuir模型。后一种模型显示，MB的最大吸附容量为133 mg/g，CIP的最大吸附容量为171 mg/g，与其他生物吸附剂相当或更好。25℃时MB的表面覆盖率为36%，CIP的表面覆盖率为32%，表明部分位点得到利用。动力学研究表明，吸附过程符合准二级模型。活化能计算得出MB为34.5 kJ/mol，CIP为-23.0 kJ/mol，表明吸附机制不同。热力学分析证实，在25℃时，两种吸附过程均为放热且自发过程，MB的相互作用能比CIP更强。基本成本分析估计，1千克阿拉伯金合欢生物吸附剂 的生产成本为1.54美元。再生试验表明，MB和CIP均可重复使用多达四个循环，且具有良好的可重复使用性。这些结果表明，阿拉伯金合欢是一种经济高效且可持续的生物吸附剂，可用于从水中去除MB和CIP，并为能源密集型处理方法提供了一种实用的替代方案。
