Remediation of lead toxicity with waste-bio materials from aqueous solutions in fixed-bed column using response surface methodology

Heavy metal ions pose significant risks to human health, pelagic, and several other life forms due to perniciousness, tendency to accumulate, and resistance to biodegradation. Waste bio-materials extend a budding alternative as low-cost adsorbent to address the removal of noxious pollutants from was...

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Published in:	Heliyon Vol. 10; no. 15; p. e35173
Main Authors:	Manzoor Shah, Aanisa, Mustafa Khan, Inayat, Du, Zhenjie, Rasool, Rehana, Habib Kant, Raihana, Mir, Shakeel, Sheikh, Tahir A., Jeelani Wani, Fehim, Ayoub Bhat, M., Bhat, Javid A., Chesti, M.H., Ganie, Mumtaz A., Hanif Mir, Yasir, Dolker, Tsering, Alharbi, Sulaiman Ali, Alahmadi, Tahani Awad, Ur Rahman, Shafeeq
Format:	Journal Article
Language:	English
Published:	England Elsevier Ltd 15-08-2024 Elsevier
Subjects:	Box-behnken design Fixed-bed column Human hair Lead adsorption RSM Waste biomaterials Lead adsorption Fixed-bed column RSM Human hair Box-behnken design Waste biomaterials
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Summary:	Heavy metal ions pose significant risks to human health, pelagic, and several other life forms due to perniciousness, tendency to accumulate, and resistance to biodegradation. Waste bio-materials extend a budding alternative as low-cost adsorbent to address the removal of noxious pollutants from wastewater on account of being cost-effective and exhibiting exceptional adsorption capacities. The current exploration was accomplished to gauge the performance of raw and modified human hair concerning lead scavenging in a down-flow fixed bed column. The appraisal of column performance under varying operational parameters encompassing bed height (15–45 cm), influent metal ion concentration (60–140 mg L−1), and a solution flow rate (20–40 mL min−1) was performed by breakthrough curve analysis. The consequences acquired were evaluated using the Yoon Nelson, Thomas, Adam-Bohart, and Bed Depth Service Time (BDST) model. Among these employed models, Bed Depth Service Time (BDST) and Thomas models exhibited the highest R-squared value compared to the Yoon Nelson and Adam-Bohart's model for most cases. In addition, the optimization of lead adsorption was followed using the Box-Behnken design of response surface methodology (RSM). The optimal conditions (desirability-1.00) for achieving a goal of maximum percent removal of lead ions were marked to be a bed height of 42.79 cm, solution flow rate of 20.92 mL min−1, and an initial metal concentration of 139.51 mg L−1. Under these optimized conditions, the percent amputation of lead in a fixed bed was observed to be 82.31 %, while the results of the experiment performed approximately under these optimized conditions revealed a percent removal of 85.05 %, reflecting a reasonable conformity with values acquired through Box-Behnken design.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	2405-8440 2405-8440
DOI:	10.1016/j.heliyon.2024.e35173