Functionalized silica nanotubes with azo-chromophore for enhanced Pd2+ and Co2+ ions monitoring in E-wastes

被引：23
作者：
Abou-Melha, Khlood S. [1 ]
Al-Hazmi, Gamil A. A. [1 ,2 ]
Habeebullah, Turki M. [3 ]
Althagafi, Ismail [4 ]
Othman, Abdullah [3 ]
El-Metwaly, Nashwa M. [4 ,5 ]
Shaaban, Fathy [3 ,6 ]
Shahat, Ahmed [7 ]
机构：
[1] King Khalid Univ, Fac Sci, Dept Chem, POB 9004, Abha, Saudi Arabia
[2] Taiz Univ, Fac Appl Sci, Dept Chem, POB 82, Taizi, Yemen
[3] Umm Al Qura Univ, Dept Environm & Hlth Res, Mecca, Saudi Arabia
[4] Umm Al Qura Univ, Fac Appl Sci, Dept Chem, Mecca, Saudi Arabia
[5] Mansoura Univ, Fac Sci, Dept Chem, Mansoura, Egypt
[6] Natl Res Inst Astron & Geophys, Dept Geomagnet & Geoelect, Kafr Al Masallat, Egypt
[7] Suez Univ, Fac Sci, Dept Chem, Suez 43518, Egypt
来源：
JOURNAL OF MOLECULAR LIQUIDS | 2021年 / 329卷
关键词：
Chemical sensor; Recovery; Palladium; Cobalt; Azo-chromophore; E-wastes; PRINTED-CIRCUIT BOARDS; TOXIC METAL-IONS; ONLINE PRECONCENTRATION; PALLADIUM; RECOVERY; ADSORPTION; ADSORBENT; DISPOSAL; REMOVAL; SAMPLES;
D O I：
10.1016/j.molliq.2021.115585
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Silica nanotubes (SNTs) were utilized as a scaffold for designing a novel solid chemical sensor. The optical nanosensor was designed by direct immobilization of novel azo-chromophore with two carboxylic acid groups called (Z)-2-((2-hydroxynaphthalen-1-yl)diazenyl)terephthalic acid (azo-HNTA) onto the SNTs. Beer's law was obeyed in the ranges of 5-240 and 5-150 ppb for Pd2+ and Co2+ ions, with linear correlation coefficients of 0.999 and 0.971, respectively. The novel nanosensor presented high sensitivity for very low concentrations up to 1.10 x 10(-7) mol L-1 (11.7 ppb for Pd2+). The proficiency of this chemosensor for utilizing as an adsorber was tested. The (azo-HNTA) sensor presented a very quick adsorption property for the elimination of Pd2+ and Co2+ ionswithout preconcentration. The capacities of adsorptionwere 69.83 and 161.03mg/g for Pd2+ and Co2+ ions, respectively. Additionally, this nanosensor has efficient recognition and selective recovery of Pd2+ and Co2+ ions in E-wastes. (C) 2021 Elsevier B.V. All rights reserved.
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页数：11
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