Utilization of oyster shell nano-hydroxyapatite modified red-brick waste as an environmentally friendly composite filler for Cd(II) and Cr(VI) adsorption: Preparation, property and mechanism

被引：2

作者：

Mao, Yajia ^{[1
]}

Zhang, Xiangling ^{[1
,2
,3
]}

Bai, Jing ^{[1
]}

Li, Xuhao ^{[1
]}

Wang, Chen ^{[1
]}

Cai, Jixian ^{[1
]}

Li, Yifan ^{[1
,2
]}

Liang, Wei ^{[1
]}

Chang, Siqi ^{[1
]}

Jiang, Yu ^{[1
]}

机构：

[1] Wuhan Univ Technol, Sch Civil Engn & Architecture, Wuhan 430070, Peoples R China

[2] Wuhan Univ Technol, Sanya Sci & Educ Innovat Pk, Hainan 572024, Peoples R China

[3] Wuhan Univ Technol, Sch Civil Engn & Architecture, 122 Luoshi Rd, Wuhan 430070, Peoples R China

来源：

JOURNAL OF WATER PROCESS ENGINEERING | 2024年 / 59卷

基金：

中国国家自然科学基金;

关键词：

Wetland filler; Construction waste red-brick; Hydroxyapatite coatings; Cd(II); Cr(VI); CONSTRUCTION WASTE; REMOVAL; CHROMIUM(VI); DYE;

D O I：

10.1016/j.jwpe.2024.104955

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The ongoing process of urbanization in China has led to a growing concern regarding environmental contamination caused by the significant accumulation of construction demolition trash. This study employs the water thermal method to synthesize hydroxyapatite using natural waste oyster shells as the primary raw material. This study explores the use of synthesized hydroxyapatite (O -HA) on building waste red-brick fragments (RBF) for removing cadmium (Cd(II)) and chromium (Cr(VI)) from water. The RBF fillers, both before and after modification, underwent comprehensive characterization using various techniques, including automated analysis of specific surface area and porosity (BET), scanning electron microscopy (SEM), energy-dispersive spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR). In the sixth cycle of purification experiments, the average removal rate of Cd(II) by O-HAmodified red-bricks (O-HA/RBF) could still reach 88.18 %, which was about 20.00 % higher than that of the RBF. However, the removal of Cr(VI) by O-HA/RBF was unsatisfactory at 5.33 %. The adsorption mechanisms of Cd(II) and Cr(VI) were explored by isothermal adsorption tests and adsorption kinetic tests. According to the mechanism analysis, physical adsorption and chemical adsorption were the main reasons for Cd(II) adsorption by OHA/RBF. This involves ion exchange and surface complexation between calcium ions in O -HA and Cd(II), forming a low-solubility precipitate for effective removal. However, for Cr(VI), physisorption predominantly governs O-HA/RBF, elucidating the limited efficacy in Cr(VI) removal. The cost analysis showed that using OHA/RBF as filler reduced overall expenses in wetland development, offering promising prospects for engineering applications.

引用

页数：12