Toward a better understanding of polymeric aluminum-modified attapulgite for the efficient removal of low phosphorus concentration.

IF 2.5 4区 环境科学与生态学 Q3 ENGINEERING, ENVIRONMENTAL Water Environment Research Pub Date : 2024-09-01 DOI:10.1002/wer.11122
Xiaoben Yang, Junming Chen, Xuewen Wu, Guocheng Zhu
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Abstract

Attapulgite (ATP) is a biocompatible clay mineral that efficiently absorbs water. It is widely used in water treatment due to its environmental friendliness and cost-effectiveness. This study aimed to develop a volume-expansion structure-based attapulgite flocculant (VES-ATP) using aluminum salt and attapulgite (ATP) under alkaline conditions, specifically for the treatment of water containing low levels of phosphorus. The VES-ATP was characterized by scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray diffraction, and X-ray photoelectron spectroscopy. The removal of phosphorus by the VES-ATP was conducted by varying the mass ratio of Al to attapulgite (denoted as RmAl/mATP), ATP dosage, and pH. The results showed that the VES-ATP had a good expansion and dispersibility in the presence of alkalized aluminum species. The basicity as the molar ratio of OH to Al (0.8 or 1.6) determined the expansion feasibility, and the coverage degree of Al onto ATP, as indicated by the mass ratio of Al to attapulgite (denoted as RmAl/mATP), determined Al flocculation efficiency. Higher values such as RmAl/mATP = 4:1 and 2:1 may result in a better flocculation. Low phosphorus treatment was successfully achieved through Al flocculation and ATP adsorption, including complexation, hydrogen bonding, and electrostatic attraction. As expected, the VES-ATP generated larger size flocs with a bigger fractal dimension than that with the sole Al flocculation. As a result, the total phosphorus could be reduced to the level below 5 μg/L. It is more efficient in the pH range of 5-9. Overall, the coupling of aluminum and attapulgite has significantly enhanced both purification capabilities of phosphorus. PRACTITIONER POINTS: Polymeric aluminum-modified attapulgite was efficient for removal of low phosphorus concentration. Phosphorus concentrations can be reduced to below 5 μg/L. Polymeric aluminum and attapulgite are both safe, and this technology is suitable for water treatment.

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更好地了解聚合铝改性阿塔蓬石如何高效去除低浓度磷。
Attapulgite (ATP) 是一种生物相容性粘土矿物,能有效吸水。由于其环保性和成本效益,它被广泛应用于水处理领域。本研究旨在开发一种基于体积膨胀结构的阿塔蓬石絮凝剂(VES-ATP),在碱性条件下使用铝盐和阿塔蓬石(ATP),专门用于处理含磷量较低的水。通过扫描电子显微镜、傅立叶变换红外光谱、X 射线衍射和 X 射线光电子能谱对 VES-ATP 进行了表征。通过改变铝与阿塔波石的质量比(表示为 RmAl/mATP)、ATP 用量和 pH 值,对 VES-ATP 的除磷效果进行了研究。结果表明,VES-ATP 在碱化铝的存在下具有良好的膨胀性和分散性。碱性(即 OH 与铝的摩尔比(0.8 或 1.6))决定了膨胀的可行性,而铝对 ATP 的覆盖程度(即铝与阿塔蓬石的质量比,用 RmAl/mATP 表示)决定了铝的絮凝效率。较高的值,如 RmAl/mATP = 4:1 和 2:1,可能会产生更好的絮凝效果。通过 Al 絮凝和 ATP 吸附(包括络合、氢键和静电吸引),成功实现了低磷处理。正如预期的那样,VES-ATP 产生的絮凝物比单纯铝絮凝产生的絮凝物尺寸更大,分形维数更高。因此,总磷可降至 5 μg/L 以下。在 pH 值为 5-9 的范围内,其效率更高。总之,铝与阿塔蓬石的耦合大大提高了磷的净化能力。实践点聚合铝改性阿塔蓬石可高效去除低浓度磷。磷浓度可降至 5 μg/L 以下。聚合铝和磷灰石都是安全的,该技术适用于水处理。
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来源期刊
Water Environment Research
Water Environment Research 环境科学-工程:环境
CiteScore
6.30
自引率
0.00%
发文量
138
审稿时长
11 months
期刊介绍: Published since 1928, Water Environment Research (WER) is an international multidisciplinary water resource management journal for the dissemination of fundamental and applied research in all scientific and technical areas related to water quality and resource recovery. WER''s goal is to foster communication and interdisciplinary research between water sciences and related fields such as environmental toxicology, agriculture, public and occupational health, microbiology, and ecology. In addition to original research articles, short communications, case studies, reviews, and perspectives are encouraged.
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