Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 404, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.124146
Keywords
MgO nanocomposite; Dye remediation; Tecoma stans (L.) plant extract; Response surface methodology
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Funding
- Foundation for Science and Technology Development, Nguyen Tat Thanh University, Ho Chi Minh City, Vietnam
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The study reports the biosynthesis of MgO nanoparticles from Tecoma stans plant extracts for the treatment of dye-containing effluents. Results indicate that MgO NPs from flower extract demonstrate better adsorption efficiency, making them suitable for effective remediation of organic dyes.
The occurrence and influence of dyes-containing effluents are alarmingly serious; hence, the treatment of such wastewater needs to be undertaken. Here, we report the biosynthesis strategy and utilisation of MgO nanoparticles (MgO NPs) from distinct Tecoma stans (L.) plant extracts (flower, bark, and leaf). The FT-IR spectroscopy revealed the dominance of chemical bonds as well as functional groups on MgO NPs surfaces. For adsorption experiments, the impact of pH, contact time, concentration, and pH on uptake efficiency of congo red (CR) and crystal violet (CV) dyes were investigated and then optimized using response surface methodology and Box-Behnken design. Under the optimal conditions, 99.7% CR (at C-i = 9.33 mg/L, Dos = 0.22, pH = 7.9) and 90.8% CV (at C-i = 5.0 mg/L, Dos = 0.3, pH = 6.3) were attained. The maximum adsorption capacities were calculated from 89.24 to 150.49 mg/g, where MgO NPs derived from flower extract gave better adsorption efficiency than those from other extracts. Therefore, MgO NPs material from Tecoma stans (L.) flower extract is expected as a perspective adsorbent for the effective remediation of organic dyes.
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