scholarly journals Invasive plant-crofton weed as adsorbent for effective removal of copper from aqueous solution

Liangqian Fan ◽  
Jiaxin Miao ◽  
Jingrui Yang ◽  
Xiaoqing Zhao ◽  
Weijuan Shi ◽  
Chemosphere ◽  
2021 ◽  
Vol 273 ◽  
pp. 129634
A. Annam Renita ◽  
Kilaru Harsha Vardhan ◽  
P. Senthil Kumar ◽  
P. Tsopbou Ngueagni ◽  
A. Abilarasu ◽  

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1691
Angela Marotta ◽  
Enrica Luzzi ◽  
Martina Salzano de Luna ◽  
Paolo Aprea ◽  
Veronica Ambrogi ◽  

Organic dyes are extensively used in many industrial sectors, and their uncontrolled disposal into wastewaters raises serious concerns for environmental and human health. Due to the large variety of such pollutants, an effective remediation strategy should be characterized by a broad-spectrum efficacy. A promising strategy is represented by the combination of different adsorbent materials with complementary functionalities to develop composite materials that are expected to remove different contaminants. In the present work, a broad-spectrum adsorbent was developed by embedding zeolite 13X powder (ZX) in a chitosan (CS) aerogel (1:1 by weight). The CS–ZX composite adsorbent removes both anionic (indigo carmine, IC) and cationic (methylene blue, MB) dyes effectively, with a maximum uptake capacity of 221 mg/g and 108 mg/g, respectively. In addition, the adsorption kinetics are rather fast, with equilibrium conditions attained in less than 2 h. The composite exhibits good mechanical properties in both dry and wet state, which enables its handling for reusability purposes. In this regard, preliminary tests show that the full restoration of the IC removal ability over three adsorption–desorption cycles is achieved using a 0.1 M NaOH aqueous solution, while a 1 M NaCl aqueous solution allows one to preserve >60% of the MB removal ability.

2021 ◽  
Vol 232 (10) ◽  
Feng Li ◽  
Yingting Zhang ◽  
Bo Xu ◽  
Yongqiang Liu ◽  
Haiyan Qiu ◽  

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