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Lignin-Derived Porous Carbon Loaded with La(OH)₃ Nanorods for Highly Efficient Removal of Phosphate

Author:
Liu, Xiaohuan, Zong, Enmin, Hu, Weijie, Song, Pingan, Wang, Jifu, Liu, Qingchun, Ma, Zhongqing, Fu, Shenyuan
Source:
ACS sustainable chemistry & engineering 2018 v.7 no.1 pp. 758-768
ISSN:
2168-0485
Subject:
United States Environmental Protection Agency, absorbents, absorption, adsorbents, adsorption, carbon, chemical precipitation, eutrophication, industrial effluents, ions, lanthanum, ligands, municipal wastewater, nanorods, pH, phosphates, phosphorus
Abstract:
Removing phosphate ions from eutrophic waters is of paramount importance; however, the design of low-cost, high-performance adsorbents for phosphorus removal has remained a huge challenge. Herein, we have demonstrated the fabrication of a low-cost, eco-friendly absorbent, LPC@La(OH)₃, by loading lanthanum hydroxide nanorods within lignin-derived porous carbon for superfast and highly efficient phosphorus removal. As-prepared LPC@La(OH)₃ exhibits a high adsorption capacity of 60.24 mg P L–¹ and a high lanthanum usage efficiency. Our results show an ultrafast removal of up to 99.5% phosphate in 10 min when the initial concentration is 2 mg P L–¹. Moreover, LPC@La(OH)₃ can efficiently reduce the phosphate concentration to meet the below U.S. Environmental Protection Agency limits (50 μg P L–¹) for eutrophication prevention. More importantly, it shows a high phosphate absorption ability over the wide range of pH 3–7, in addition to a high adsorption selectivity toward phosphate and high stability during adsorption process. Both the chemical precipitation and the ligand exchange are mainly responsible for the phosphate removal by LPC@La(OH)₃. As-designed lignin-derived, ecofriendly, high-performance LPC@La(OH)₃ shows enormous potential for the phosphate removal from both municipal wastewater and industrial effluents.
Agid:
6270727