Enhanced Cr(VI) removal from water using a green synthesized nanocrystalline chlorapatite: Physicochemical interpretations and fixed-bed column mathematical model study

Han，Xuan1,2; Zhang，Yong3; Zheng，Chunmiao4,5; Yu，Xiangnan6; Li，Shiyin1; Wei，Wei1,2,4

2021-02-01

10.1016/j.chemosphere.2020.128421

CHEMOSPHERE   影响因子和分区

0045-6535

1879-1298

Apatite-based minerals have attracted much attention in the remediation of heavy metal-contaminated environment. However, exploring apatite with efficient adsorption performance for inorganic oxyanions such as Cr(VI) remains a challenge. Herein, a novel nanocrystalline chlorapatite (ClAP) was promptly prepared by a green method using eggshell wastes as calcium source with the purpose to enhance Cr(VI) adsorption capability. The generated ClAP was characterized by XRD, SEM-EPMA, TEM, FTIR, and BET analyses. Batch and column experiments were subsequently carried out to explore the influencing factors, adsorption capacity and removal mechanism. Results showed that ClAP exhibited excellent stability and adsorption performance for Cr(VI) (63.47 mg g), which was much greater than that of hydroxyapatite and most reported materials. The adsorption process was fitted well by the pseudo-second-order model and the Langmuir model. In fixed bed column experiments, a novel time-fractional derivative model exhibited much better suitability in interpreting the observed breakthrough curves of Cr(VI) than traditional models. Furthermore, the reusability of ClAP in column was evaluated. Results showed that the adsorption capacity maintained well after consecutively reused for five cycles. Studies of the effect of pH, as well as FTIR and XPS investigations indicated that Cr(VI) adsorption was mainly ascribed to electrostatic interactions and surface complexation, while the reduction of Cr(VI) to the low-toxicity Cr(III) also existed in the adsorption process. The ClAP adsorbent was also successfully used for Cr(VI) remediation from real wastewater. Hence, nanocrystalline ClAP can be a promising material for enhancing the elimination of oxyanion contaminants such as Cr(VI) from water.

Adsorption Chlorapatite Fixed bed-column Hexavalent chromium Reusability

SCI ; EI

英语

其他

National Natural Science Foundation of China[41931292] ; Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control[2017B030301012] ; National Science and Technology Major Project of China[2017ZX07203003] ; Foundation for Talent Recommendation Program of Nanjing Normal University[2011105XGQ0247] ; PAPD - Priority Academic Program Development of Jiangsu Higher Education Institutions[164320H101]

Environmental Sciences & Ecology

Environmental Sciences

WOS:000599817400026

PERGAMON-ELSEVIER SCIENCE LTD

20204109307916

Nanocrystals ; Reusability ; Chromium compounds ; Apatite ; Chemicals removal (water treatment) ; Hydroxyapatite ; Nanocrystalline materials ; Heavy metals

Industrial Wastes:452.3 ; Minerals:482.2 ; Metallurgy and Metallography:531 ; Nanotechnology:761 ; Chemical Operations:802.3 ; Chemical Agents and Basic Industrial Chemicals:803 ; Chemical Products Generally:804 ; Inorganic Compounds:804.2 ; Crystalline Solids:933.1

ENVIRONMENT/ECOLOGY

2-s2.0-85091908531

Scopus

1.School of Environment,Nanjing Normal University,Nanjing,210023,China
2.Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application,Nanjing,210023,China
3.Department of Geological Sciences,University of Alabama,Tuscaloosa,35487,United States
4.Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control,Shenzhen,518055,China
5.School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
6.College of Mechanics and Materials,Hohai University,Nanjing,210098,China

Han，Xuan,Zhang，Yong,Zheng，Chunmiao,et al. Enhanced Cr(VI) removal from water using a green synthesized nanocrystalline chlorapatite: Physicochemical interpretations and fixed-bed column mathematical model study[J]. CHEMOSPHERE,2021,264.

Han，Xuan,Zhang，Yong,Zheng，Chunmiao,Yu，Xiangnan,Li，Shiyin,&Wei，Wei.(2021).Enhanced Cr(VI) removal from water using a green synthesized nanocrystalline chlorapatite: Physicochemical interpretations and fixed-bed column mathematical model study.CHEMOSPHERE,264.

Han，Xuan,et al."Enhanced Cr(VI) removal from water using a green synthesized nanocrystalline chlorapatite: Physicochemical interpretations and fixed-bed column mathematical model study".CHEMOSPHERE 264(2021).