首页|Optimization of the adsorption performance of herbal residues as lanthanide ion-modified carriers for phosphate by fly ash and its application

Optimization of the adsorption performance of herbal residues as lanthanide ion-modified carriers for phosphate by fly ash and its application

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In order to mitigate the harmful effects of eutrophication in water bodies, the applications of lanthanummodifiedmaterials for phosphate removal from wastewater have attracted much attention. Unlike conventionaladsorbents, plant wastes usually have poor adsorption abilities and are difficult to be reused for desorptionof phosphate due to their small pore sizes and ununiform loading of modified ions. In this paper, a compositeadsorbent (LC-MM) was synthesized by hydrothermal treatment of waste traditional Chinese medical materials (MMs) with load of lanthanum carbonate and co-heating treatment with coal fly ash (CFA), which was applied toremove phosphate from water. The results showed that maximum adsorption capacity of LC-MM was 52 mg g~(-1),and the LC-MM showed appreciable adsorption capacity of phosphate for agricultural wastewater in the presenceof complex interfering ions and for urban surface waters with low phosphate concentrations. Five adsorptiondesorptioncycles showed good reusability. The mechanism study showed that the La~(3+) ions were more uniformlydistributed on the surface of the absorbents with the introduction of Fe~(3+), Al~(3+), Mg~(2+) and Ca~(2+) ions inCFA. The ligand exchange between phosphate and carbonate, the internal spherical complexation formed bylanthanum ion and phosphate, and surface chemical precipitation attachment are the main reasons why theadsorption capacity of LC-MM approached or even surpassed that of conventional lanthanum-modified adsorbents.In conclusions, this work proposed an effective method for the modification of plant materials.

Lanthanum carbonateHydrothermal synthesis and co-heatingModified plant adsorbentsUtilization of waste materials

Caigao Zhou、Zihan Chen、Guochun Lv、Changlian Xu、Guiyin Wang、Shirong Zhang、Zhanbiao Yang、Zhang Cheng、Junzhuo Cai、Ting Li、Yulin Pu、Zhien Pu、Xin Qi、Guangli Xiao、Xiaoxun Xu

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College of Environmental Sciences, Sichuan Agricultural University, Chengdu, 611130, PR China

College of Environmental Sciences, Sichuan Agricultural University, Chengdu, 611130, PR China,Key Laboratory of Soil Environment Protection of Sichuan Province, Chengdu, 611130, PR China

College of Resources, Sichuan Agricultural University, Chengdu, 611130, PR China

College of Agronomy, Sichuan Agricultural University, Chengdu, 611130, PR China

Sichuan Keyuan Engineering Technology Testing Center Co., LTD, Chengdu, 611130, PR China

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2024

10.1016/j.chemosphere.2023.140704

Chemosphere

Chemosphere

ISSN：0045-6535
年,卷(期)：2024.348(Jan.)
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