Adsorptive removal of trace lead from drinking water in a functionalized activated carbon fibers fixed bed column: Experimental and modeling study

IF 5.2 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Liquids Pub Date : 2025-10-04 DOI:10.1016/j.molliq.2025.128659

Qi Zuo , Hong Zheng , Pengyi Zhang , Yu Zhang , Jiejing Zhang

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引用次数: 0

Abstract

Functionalized activated carbon fibers (ACFs) have good application prospects for eliminating trace heavy metals ions from water. Continuous removal in a fixed bed is preferred and supposed industrially feasible for the elimination of various pollutants in comparison to batch operation. Herein, ACFs was pretreated using H₂O₂ and further functionalized by polydopamine (PDA). The as-prepared PDA/OACF material maintained high specific surface area, micro-mesoporous structure and abundant functional groups, which facilitated the rapid diffusion of trace Pb(II) ions to the surface through electrostatic attraction and subsequent coordinated complexation. Its dynamic adsorption behavior for trace Pb(II) ions was investigated at different bed heights, flow rates and influent lead ions concentrations using a continuously operating fixed-bed adsorption device. PDA/OACF could purify over 127.80 L (22,421 BVs) simulated drinking water containing 150 μg L⁻¹ Pb(II) ions under optimal conditions and maximum adsorption capacity which effluent Pb(II) concentration met safe drinking water standard attained 33.01 mg/g, which was obviously higher than the corresponding static adsorption capacity of 20.34 mg/g at an initial concentration of 150 μg L⁻¹. The results of mass transfer zone (MTZ), Reynolds number (R_e) and pressure drop obtained at different conditions indicated that the fixed-bed had relatively small resistance and PDA/OACF adsorbent was highly suitable for dynamic adsorption of Pb(II) ions in fixed-bed. Thomas and BDST models could fit the dynamic adsorption data well. The actual tap water containing trace lead could also be efficiently purified and 0.6 g PDA/OACF could purify about 44 L (7719 BVs) tap water containing 150 μg L⁻¹ Pb(II). PDA/OACF shows superior cost competitiveness and application prospect in the purification of drinking water.

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功能化活性炭纤维固定床柱吸附去除饮用水中痕量铅的实验与模拟研究

功能化活性炭纤维在去除水中痕量重金属离子方面具有良好的应用前景。与间歇操作相比，在固定床上连续去除是优选的，并且假定在工业上可行，可以消除各种污染物。在本研究中，ACFs采用H2O2预处理，并通过聚多巴胺（PDA）进一步功能化。制备的PDA/OACF材料保持了高比表面积、微介孔结构和丰富的官能团，有利于微量Pb（II）离子通过静电吸引和随后的配位络合快速扩散到表面。采用连续运行固定床吸附装置，研究了不同床层高度、流量和进水铅离子浓度下，其对痕量铅离子的动态吸附行为。在最佳条件下，PDA/OACF可净化含150 μg L−1 Pb（II）离子的模拟饮用水127.80 L (22,421 BVs)，出水Pb（II）浓度达到安全饮用水标准时的最大吸附量为33.01 mg/g，明显高于初始浓度为150 μg L−1时对应的静态吸附量20.34 mg/g。在不同条件下得到的传质区（MTZ）、雷诺数（Re）和压降结果表明，固定床具有较小的阻力，PDA/OACF吸附剂非常适合在固定床上动态吸附Pb（II）离子。Thomas和BDST模型能较好地拟合动态吸附数据。同时，0.6 g PDA/OACF可有效净化含铅自来水44 L （7719 BVs）含铅自来水150 μg L−1 Pb（II）。PDA/OACF在饮用水净化中具有较强的成本竞争力和应用前景。

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来源期刊

Journal of Molecular Liquids 化学-物理：原子、分子和化学物理

CiteScore

10.30

自引率

16.70%

发文量

2597

审稿时长

78 days

期刊介绍： The journal includes papers in the following areas: – Simple organic liquids and mixtures – Ionic liquids – Surfactant solutions (including micelles and vesicles) and liquid interfaces – Colloidal solutions and nanoparticles – Thermotropic and lyotropic liquid crystals – Ferrofluids – Water, aqueous solutions and other hydrogen-bonded liquids – Lubricants, polymer solutions and melts – Molten metals and salts – Phase transitions and critical phenomena in liquids and confined fluids – Self assembly in complex liquids.– Biomolecules in solution The emphasis is on the molecular (or microscopic) understanding of particular liquids or liquid systems, especially concerning structure, dynamics and intermolecular forces. The experimental techniques used may include: – Conventional spectroscopy (mid-IR and far-IR, Raman, NMR, etc.) – Non-linear optics and time resolved spectroscopy (psec, fsec, asec, ISRS, etc.) – Light scattering (Rayleigh, Brillouin, PCS, etc.) – Dielectric relaxation – X-ray and neutron scattering and diffraction. Experimental studies, computer simulations (MD or MC) and analytical theory will be considered for publication; papers just reporting experimental results that do not contribute to the understanding of the fundamentals of molecular and ionic liquids will not be accepted. Only papers of a non-routine nature and advancing the field will be considered for publication.