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Open AccessArticle

A Functionalized Silicate Adsorbent and Exploration of Its Adsorption Mechanism

by Hanzhi Lin 1,2,†, Tao Chen 3,4,*,†, Bo Yan 3,4, Zulv Huang 1,2, Yang Zhou 1,2, Jian Huang 3,4 and Xianming Xiao 1
State Key Laboratory of Organic Geochemistry, Guangdong Provincial Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
University of Chinese Academy of Sciences, Beijing 100082, China
SCNU Environmental Research Institute, Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety & MOE Key Laboratory of Theoretical Chemistry of Environment, South China Normal University, Guangzhou 510006, China
School of Environment, South China Normal University, University Town, Guangzhou 510006, China
Author to whom correspondence should be addressed.
These authors contributed equally to this work.
Molecules 2020, 25(8), 1820;
Received: 19 February 2020 / Revised: 4 April 2020 / Accepted: 14 April 2020 / Published: 16 April 2020
(This article belongs to the Section Photochemistry)
Active silicate materials have good adsorption and passivation effects on heavy metal pollutants. The experimental conditions for the preparation of active silicate heavy metal adsorbent (ASHMA) and the adsorption of Cu(II) by ASHMA were investigated. The optimum preparation conditions of ASHMA were as follows: 200 mesh quartz sand as the raw material, NaOH as an activating agent, NaOH/quartz sand = 0.45 (mass fraction), and calcination at 600 °C for 60 min. Under these conditions, the active silicon content of the adsorbent was 22.38% and the utilization efficiency of NaOH reached 89.11%. The adsorption mechanism of Cu(II) on the ASHMA was analyzed by the Langmuir and Freundlich isotherm models, which provided fits of 0.99 and 0.98, respectively. The separation coefficient (RL) and adsorption constant (n) showed that the adsorbent favored the adsorption of Cu(II), and the maximum adsorption capacity (Qmax) estimated by the Langmuir isotherm was higher than that of 300 mg/L. Furthermore, adsorption by ASHMA was a relatively rapid process, and adsorption equilibrium could be achieved in 1 min. The adsorbents were characterized by FT-IR and Raman spectroscopy. The results showed that the activating agent destroyed the crystal structure of the quartz sand under calcination, and formed Si-O-Na and Si-OH groups to realize activation. The experimental results revealed that the adsorption process involved the removal of Cu(II) by the formation of Si-O-Cu bonds on the surface of the adsorbent. The above results indicated that the adsorbent prepared from quartz sand had a good removal effect on Cu(II). View Full-Text
Keywords: calcination-activation; active silicate; heavy metal adsorption; adsorption mechanism calcination-activation; active silicate; heavy metal adsorption; adsorption mechanism
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MDPI and ACS Style

Lin, H.; Chen, T.; Yan, B.; Huang, Z.; Zhou, Y.; Huang, J.; Xiao, X. A Functionalized Silicate Adsorbent and Exploration of Its Adsorption Mechanism. Molecules 2020, 25, 1820.

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