Synthesis of Amphiphilic Silica with High Exposure of Surface Groups and Its Utilization in Efficient Removal of Organic Dyes from Aqueous Solution

2021 ◽  
pp. 2106828
Author(s):  
Yuanyuan Yang ◽  
Zhenhao Qiu ◽  
Guoying Weng ◽  
Huibin Wang ◽  
Yanshuo Li ◽  
...  
2019 ◽  
Vol 42 (5) ◽  
pp. 1070-1077
Author(s):  
Qianqian Xu ◽  
Deshuai Sun ◽  
Yanfei Qi ◽  
Liangyan Duan

NANO ◽  
2020 ◽  
Vol 15 (10) ◽  
pp. 2050126 ◽  
Author(s):  
Rui Wang ◽  
Kanglong Chen ◽  
Si Peng ◽  
Qiu-Yue Wang ◽  
Shuang-Hui Huang ◽  
...  

The poor environmental friendliness, low adsorption capacity and nonreusability of adsorbents are still challenging for the removal of pollutants in aqueous solution. Herein, novel polypeptide-functionalized silica-coated magnetic nanoparticles (PS-MNPs), Fe3O4@SiO2@PLL nanoparticles, with good environmental friendliness, excellent adsorption capability and economic reusability were designed and prepared for efficient removal of methylene blue (MB) and Cr(VI) ion (Cr2O[Formula: see text]. The chem-physical properties of Fe3O4@SiO2@PLL nanoparticles, such as chemical structure, nanosize, nanomorphology, crystalline structure, magnetization and thermo-oxidative degradation behavior were fully investigated in this study. In addition, the adsorption properties of the Fe3O4@SiO2@PLL nanoparticles for MB and Cr(VI) ion in aqueous solution were explored by batch adsorption experiments. Based on the experimental results, the Fe3O4@SiO2@PLL nanoparticles demonstrated excellent adsorption capacity for removal of both MB and Cr(VI) ion that the theoretical maximum adsorption capacities of the nanoparticles were 301.2[Formula: see text]mg [Formula: see text] g[Formula: see text] for MB and 164.7[Formula: see text]mg [Formula: see text] g[Formula: see text] for Cr(VI), respectively. The adsorption process could be better fitted by pseudo-second-order model, and matched well with the Langmuir isotherm equation. Moreover, the Fe3O4@SiO2@PLL nanoparticles could be easily regenerated by desorbing metal ions and organic dyes from the adsorbents with appropriate eluents, and showed good adsorption capacity after five recycles. In brief, the as-prepared PS-MNPs exhibited improved environmental friendliness, excellent adsorption properties and high regeneration efficiency, which could be used as a potential adsorbent for different kinds of contaminants removal.


2020 ◽  
pp. 128-139
Author(s):  
M. Yu. Shumakher ◽  
V. V. Konovalov ◽  
A. P. Melnikov

Currently, the treatment of the bottomhole formation zone with acidic compositions is one of the most common methods to intensify the oil inflow. The use of various modified acid compositions increases the efficiency of acid treatments on the bottomhole formation zone. Acid compositions, including those containing hydrocarbon solvents, which contribute to more efficient removal of organic colmatants, affect the reaction rate of the reagent with the rock and processing equipment, change the reservoir properties, etc.The article presents the results of experimental studies, which are aimed at establishing the effect of the composition of hydrocarbon-containing acidic emulsions consisting of an aqueous solution of hydrochloric acid, toluene and Neonol AF 9-10 on their dispersed and rheological properties, as well as their efficiency in removing paraffin deposits.


Author(s):  
Xiaofeng Huang ◽  
Qiulin Deng ◽  
Xingzhang Wang ◽  
Hongquan Deng ◽  
Tinghong Zhang ◽  
...  

Polymers ◽  
2021 ◽  
Vol 13 (11) ◽  
pp. 1691
Author(s):  
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.


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