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

Liu, Xiaohuan, Zong, Enmin, Hu, Weijie, Song, Pingan, Wang, Jifu, Liu, Qingchun, Ma, Zhongqing, Fu, Shenyuan
ACS sustainable chemistry & engineering 2018 v.7 no.1 pp. 758-768
United States Environmental Protection Agency, absorbents, absorption, adsorbents, adsorption, carbon, chemical precipitation, eutrophication, industrial effluents, ions, lanthanum, ligands, municipal wastewater, nanorods, pH, phosphates, phosphorus
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.