Abstract

In the present study, zeolite A was synthesized via inorganic complex precursor as an efficient novel route by using tris(acetylacetonato)aluminum(III), [Al(C₅H₇O₂)₃], and tris(acetylacetonato)silicon(IV) chloride hydrochloride, [Si(C₅H₇O₂)₃]Cl.HCl. The physicochemical properties of the zeolite A were characterized by FT-IR, XRD, SEM/EDX, BJH, and BET techniques. The performance of the synthesized zeolite A was evaluated for the elimination of heavy metal cations (Co²⁺, Cu²⁺, Zn²⁺, Cr³⁺ and Pb²⁺) from aqueous solutions. The results revealed that removal efficiencies of the synthesized zeolite A toward all investigated heavy metal cations were obtained to be more than 95% and the maximum removal efficiency was observed for Pb²⁺. The influence of parameters such as pH, contact time and adsorbent amount was surveyed on the removal efficiency of Pb²⁺ by the zeolite A. The most desirable conditions for Pb²⁺ removal was attained at pH 6.5, the zeolite amount of 0.5 g, 400 mgL⁻¹ initial concentration of Pb²⁺ and the contact time of 30 min. The adsorption process followed second- order kinetics model and the pseudo-second-order adsorption rate constant (k₂) was obtained to be 4.32 × 10⁻⁴ g mg⁻¹min⁻¹.

摘要

在本研究中，使用三（乙酰丙酮）铝（III）、[Al（C 5 H 7 O 2 ） 3 ]_和三_（乙酰_丙酮）_硅（IV），通过无机络合物前体合成沸石 A 作为一种有效的新路线)氯化物盐酸盐，[Si(C ₅ H ₇ O ₂ ) ₃ ]Cl·HCl。沸石 A 的物理化学性质通过 FT-IR、XRD、SEM/EDX、BJH 和 BET 技术表征。评估合成沸石 A 去除重金属阳离子（Co ²⁺、Cu ²⁺、Zn ²⁺、Cr ³⁺和 Pb ^{2+ ）的性能}) 来自水溶液。结果表明，合成沸石 A 对所有研究的重金属阳离子的去除效率均超过 95%，并且观察到 Pb ²⁺的去除效率最高。^{考察了pH值、接触时间和吸附剂用量等参数对沸石A去除Pb 2+}效率的影响。最理想的Pb ²⁺去除条件为pH值为6.5，沸石用量为0.5 g，Pb ²⁺的初始浓度为400 mgL ^-1，接触时间为 30 分钟。吸附过程遵循二级动力学模型和准二级吸附速率常数( k ₂) 得到 4.32 × 10 ^-4 g mg ^-1 min ^-1。