通过记忆效应和原位合成层状双氢氧化物吸附去除磷酸盐和硝酸盐

IF 5.7 3区 环境科学与生态学 Q1 WATER RESOURCES
Sarah Mariska, Zhang Jin-Wei, Hoang Huu Chien, Duong Minh Ngoc, Nguyen Duy Hai, Huan-Ping Chao
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引用次数: 0

摘要

本研究考察了层状双氢氧化物(LDHs)去除废水中磷酸盐和硝酸盐的效果,并通过记忆效应和原位合成技术增强。LDHs是水热合成的,最初生成碳酸盐基的CO₃-LDHs,然后通过阴离子交换转化为氯化物基的Cl-LDHs。分别在300°C、400°C和500°C下进行焙烧,以优化其结构以增强吸附能力。利用扫描电镜(SEM)、傅里叶变换红外光谱(FTIR)、布鲁诺尔-埃米特-泰勒(BET)表面积分析和x射线衍射(XRD)等手段对合成的低密度氢化物进行了表征。在pH值为5、7和9的溶液中进行吸附实验,分别研究了CO₃- ldh和Cl-LDH对磷酸盐和硝酸盐的吸附能力。结果表明,500℃煅烧的LDHs吸附性能最好,对磷酸盐和硝酸盐的最大吸附量分别为184 mg/g和70.1 mg/g。动力学研究证实了吸附过程遵循伪二阶模型,证明了记忆效应在促进离子交换方面的有效性。可控条件下原位合成的LDHs显著提高了废水中阴离子污染物的去除率,证明了该方法在现实废水处理中的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Adsorptive removal of phosphate and nitrate by layered double hydroxides through the memory effect and in situ synthesis

This research examines the efficacy of layered double hydroxides (LDHs) in removing phosphate and nitrate from wastewater, enhanced by the memory effect and in situsynthesis techniques. LDHs were synthesized hydrothermally, initially creating carbonate-based CO₃–LDHs, which were then converted to chloride-based Cl–LDHs through anion exchange. These LDHs underwent calcination at 300 °C, 400 °C, and 500 °C to optimize their structure for enhanced adsorption capabilities. The synthesized LDHs were thoroughly characterized using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), Brunauer–Emmett–Teller (BET) surface area analysis, and X-ray diffraction (XRD). Adsorption experiments in solutions with pH values between 5, 7, and 9 revealed the adsorption capacities of phosphate and nitrate on the CO₃–LDHs and Cl–LDH, respectively. The results indicated that LDHs calcined at 500 °C showed the highest adsorption performance, achieving maximum capacities of 184 mg/g for phosphate and 70.1 mg/g for nitrate. Kinetic studies confirmed that the adsorption process followed a pseudo-second-order model, demonstrating the effectiveness of the memory effect in enhancing ion exchange. The in situ synthesis of LDHs under controlled conditions significantly improved the removal rates of these anionic contaminants from wastewater, proving the potential of this method for the realistic wastewater treatment.

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来源期刊
Applied Water Science
Applied Water Science WATER RESOURCES-
CiteScore
9.90
自引率
3.60%
发文量
268
审稿时长
13 weeks
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