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BiOCl 0.5 X 0.5 (X = F, Br, and I) heterojunctions were prepared via the solvothermal approach to achieve the solar-light induced photodegradation of tetracycline hydrochloride (TCH). The photocatalytic activity of BiOCl coupling with BiOI is greatly affected by the molar ratio of Cl/I. The best photocatalytic efficiency of 97.9 % within 120 min is obtained by flower-like BiOCl 0.5 I 0.5 microspheres with a Cl/I molar ratio of 1:1, and the removal efficiency of TCH over BiOCl 0.5 I 0.5 declines to 93.2 % after five cycles. Compared with BiOCl 0.5 Br 0.5 and BiOCl 0.5 F 0.5 , BiOCl 0.5 I 0.5 presents the better photocatalytic activity. Z-scheme junction between BiOCl and BiOI is favorable for the efficient separation and migration of photo-generated charge carriers, and the narrow band-gap structure of BiOCl 0.5 I 0.5 microspheres favors the visible-light harvesting.·O 2 - plays a vital role in BiOCl 0.5 I 0.5 -assisted photocatalytic reaction. However, the change in valance states induced by photo-corrosion is responsible for the solar-light deactivation of BiOCl 0.5 I 0.5. [Display omitted] • BiOCl 0.5 X 0.5 (X = F, Br, and I) heterojunctions have excellent photodegradation activity. • Z-scheme BiOCl 0.5 I 0.5 junction favors the rapid transfer and separation of charge carriers. • BiOCl 0.5 I 0.5 (2.09 eV) has narrow band-gap structure for visible-light harvesting. [ABSTRACT FROM AUTHOR]

BiOCl 0.5 X 0.5 (X = F, Br, and I) heterojunctions were prepared via the solvothermal approach to achieve the solar-light induced photodegradation of tetracycline hydrochloride (TCH). The photocatalytic activity of BiOCl coupling with BiOI is greatly affected by the molar ratio of Cl/I. The best photocatalytic efficiency of 97.9 % within 120 min is obtained by flower-like BiOCl 0.5 I 0.5 microspheres with a Cl/I molar ratio of 1:1, and the removal efficiency of TCH over BiOCl 0.5 I 0.5 declines to 93.2 % after five cycles. Compared with BiOCl 0.5 Br 0.5 and BiOCl 0.5 F 0.5 , BiOCl 0.5 I 0.5 presents the better photocatalytic activity. Z-scheme junction between BiOCl and BiOI is favorable for the efficient separation and migration of photo-generated charge carriers, and the narrow band-gap structure of BiOCl 0.5 I 0.5 microspheres favors the visible-light harvesting.·O 2 - plays a vital role in BiOCl 0.5 I 0.5 -assisted photocatalytic reaction. However, the change in valance states induced by photo-corrosion is responsible for the solar-light deactivation of BiOCl 0.5 I 0.5. [Display omitted] • BiOCl 0.5 X 0.5 (X = F, Br, and I) heterojunctions have excellent photodegradation activity. • Z-scheme BiOCl 0.5 I 0.5 junction favors the rapid transfer and separation of charge carriers. • BiOCl 0.5 I 0.5 (2.09 eV) has narrow band-gap structure for visible-light harvesting. [ABSTRACT FROM AUTHOR]

To extend the efficiency of biochar in the adsorption-photocatalytic removal of tetracycline hydrochloride from wastewater, biochar derived from bagasse were co-modified with La 2 S 3 and MgO (La/Mg-biochar) via the one-pot high-temperature sulfidation. Compared to MgO/biochar and La 2 S 3 /biochar, La/Mg-biochar composites exhibited higher adsorption-photocatalysis activity for tetracycline hydrochloride (TCH) removal at a low optical density (25 mW cm-2). The functional groups, O-H, C-N, C-O and Mg-O etc, in La/Mg-biochar provided the abundant vacant sites for TCH adsorption and photocatalysis, and the junction interface among La 2 S 3 , MgO, and biochar was likely to form the channels for the separation and transfer of photo-induced e-/h+ pairs. La/Mg-biochar present the better adsorption-photocatalytic capacity of TCH than La 2 S 3 and MgO modified biochar. The adsorption process of La/Mg-biochar was spontaneous physical adsorption, which was well described by second-order and Langmuir models. The optimal 2-La/b-Mg-biochar could remove 95.01% removal of 100 mg L-1 TCH solution within 120 min, and its adsorption capacity was 120.59 mg g-1. Biochar-based composites thus display a high potential application in the removal of antibiotic pollutants from wastewater. • Biochar was co-modified by La 2 S 3 and MgO via one-pot sulfidation. • Optimal 2-La/b-Mg-biochar removed 95.01% TCH solution within 120 min. • Second-order model and Langmuir well fitted with the adsorption kinetics and isotherm of La/Mg-biochar composites, respectively. • Adsorption capacity of 2-La/b-Mg-biochar based on second-order model was 120.59 mg g-1. [ABSTRACT FROM AUTHOR]