@article {doi:10.1021/acs.est.2c03292,
	title = {Selenite and Selenate Sequestration during Coprecipitation with Barite: Insights from Mineralization Processes of Adsorption, Nucleation, and Growth},
	journal = {Environmental Science \&amp; Technology},
	volume = {26},
	year = {2022},
	note = {PMID: 36322394},
	pages = {15518-15527},
	abstract = {Coprecipitation of selenium oxyanions with barite is a facile way to sequester Se in the environments. However, the chemical composition of Se-barite coprecipitates usually deviates from that predicted from thermodynamic calculations. This discrepancy was resolved by considering variations in nucleation and growth rates controlled by ion{\textendash}mineral interactions, solubility, and interfacial energy. For homogeneous precipitation, \~{}10\% of sulfate, higher than thermodynamic predictions (\&lt;0.3\%), was substituted by Se(IV) or Se(VI) oxyanion, which was attributed to adsorption-induced entrapment during crystal growth. For heterogeneous precipitation, thiol- and carboxylic-based organic films, utilized as model interfaces to mimic the natural organic-abundant environments, further enhanced the sequestration of Se(VI) oxyanions (up to 41{\textendash}92\%) with barite. Such enhancement was kinetically driven by increased nucleation rates of selenate-rich barite having a lower interfacial energy than pure barite. In contrast, only small amounts of Se(IV) oxyanions (\~{}1\%) were detected in heterogeneous coprecipitates mainly due to a lower saturation index of BaSeO3 and deprotonation degree of Se(IV) oxyanion at pH 5.6. These roles of nanoscale mineralization mechanisms observed during composition selection of Se-barite could mark important steps toward the remediation of contaminants through coprecipitation.},
	doi = {10.1021/acs.est.2c03292},
	url = {https://doi.org/10.1021/acs.est.2c03292},
	author = {Deng, Ning and Zuo, Xiaobing and Andrew G. Stack and Lee, Sang Soo and Zhou, Zehao and Juliane Weber and Yandi* Hu}
}
