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Highly effective removal of phosphate from complex water environment with porous Zr-bentonite alginate hydrogel beads: Facile synthesis and adsorption behavior study
Applied Clay Science ( IF 5.6 ) Pub Date : 2021-02-01 , DOI: 10.1016/j.clay.2020.105919
Huan Xi , Qingqing Li , Yan Yang , Jianfeng Zhang , Feng Guo , Xiaogang Wang , Shikai Xu , Shiping Ruan

Abstract The development of an effective phosphate removal strategy is still considered to be an important challenge in the field of wastewater remediation. In this study, novel alginate immobilized Zr-bentonite hydrogel beads were synthesized assisted by Zr-modification and Na2CO3 + HCl pore forming (abbreviated as NH-SA-ZrBT), that led to an enhancement in the specific surface area and porosity. The novel NH-SA-ZrBT adsorbent exhibited a high stability and adsorption selectivity for phosphate from complex water environments with various competitive anions, NaCl salinity and humic acid. The isotherm was fitted well by both Langmuir and Freundlich models, suggesting that the adsorption process was the chemisorption and the hydrogel beads could function through a variety of mechanisms. The maximum adsorption capacity of NH-SA-ZrBT for phosphate was calculated to be 63.61 mg/g at 25 °C by Langmuir model and had a high retention of 92.2% after five adsorption-desorption cycles. The kinetic data were better fitted by the pseudo-second model. Considering the zeta potential and XPS data before and after the phosphate adsorption, the adsorption mechanism was proposed to be a combination of electrostatic attraction, ligand exchange and inner sphere complexation. The present study demonstrates a new strategy for the fabrication of stable, separable and low-cost bentonite-containing hydrogel beads for phosphate removal from complex wastewater.

中文翻译:

用多孔 Zr-膨润土藻酸盐水凝胶珠高效去除复杂水环境中的磷酸盐:简便的合成和吸附行为研究

摘要 开发有效的磷酸盐去除策略仍然被认为是废水修复领域的一个重要挑战。在这项研究中,通过 Zr 改性和 Na2CO3 + HCl 孔形成(缩写为 NH-SA-ZrBT)辅助合成了新型藻酸盐固定的 Zr-膨润土水凝胶珠,从而提高了比表面积和孔隙率。新型 NH-SA-ZrBT 吸附剂对来自具有各种竞争性阴离子、NaCl 盐度和腐殖酸的复杂水环境中的磷酸盐表现出高稳定性和吸附选择性。Langmuir 和 Freundlich 模型都很好地拟合了等温线,表明吸附过程是化学吸附,水凝胶珠可以通过多种机制发挥作用。通过朗缪尔模型计算出 NH-SA-ZrBT 对磷酸盐的最大吸附容量在 25°C 下为 63.61 mg/g,并且在五个吸附-解吸循环后具有 92.2% 的高保留率。动力学数据更适合伪秒模型。考虑磷酸盐吸附前后的zeta电位和XPS数据,提出吸附机制是静电引力、配体交换和内球络合的结合。本研究展示了一种制造稳定、可分离且低成本的含膨润土水凝胶珠的新策略,用于从复杂废水中去除磷酸盐。考虑磷酸盐吸附前后的zeta电位和XPS数据,提出吸附机制是静电引力、配体交换和内球络合的结合。本研究展示了一种制造稳定、可分离且低成本的含膨润土水凝胶珠的新策略,用于从复杂废水中去除磷酸盐。考虑磷酸盐吸附前后的zeta电位和XPS数据,提出吸附机制是静电引力、配体交换和内球络合的结合。本研究展示了一种制造稳定、可分离且低成本的含膨润土水凝胶珠的新策略,用于从复杂废水中去除磷酸盐。
更新日期:2021-02-01
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