SbSI Nanocrystals: An Excellent Visible Light Photocatalyst with Efficient Generation of Singlet Oxygen

Wang, C (Wang, Chong)[ 1 ] ; Zhang, M (Zhang, Mian)[ 2,3 ] ; Fang, Y (Fang, Yong)[ 4 ] ; Chen, GY (Chen, Gaoyu)[ 5 ] ; Li, Q (Li, Qi)[ 1 ] ; Sheng, XX (Sheng, Xuexi)[ 1 ] ; Xu, XX (Xu, Xiangxing)[ 1 ]*（徐翔星） ; Hui, JF (Hui, Junfeng)[ 5 ]* ; Lan, YQ (Lan, Yaqian)[ 1 ] ; Fang, M (Fang, Min)[ 1 ] ; Wang, XJ (Wang, Xiaojun)[ 6 ] ; Wang, XP (Wang, Xinping)[ 4 ] ; Dai, ZH (Dai, Zhihui)[ 1 ] ; Bao, JC (Bao, Jianchun)[ 1 ] ; Wang, P (Wang, Peng)[ 2,3 ]*

[ 1 ] Nanjing Normal Univ, Sch Chem & Mat Sci, Jiangsu Key Lab Biofunct Mat, 1 Wenyuan Rd, Nanjing 210046, Jiangsu, Peoples R China

[ 2 ] Nanjing Univ, Coll Engn & Appl Sci, Natl Lab Solid State Microstruct, 22 Hankou Rd, Nanjing 210093, Jiangsu, Peoples R China

[ 3 ] Nanjing Univ, Collaborat Innovat Ctr Adv Microstruct, 22 Hankou Rd, Nanjing 210093, Jiangsu, Peoples R China

[ 4 ] Nanjing Univ, Sch Chem & Chem Engn, Collaborat Innovat Ctr Adv Microstruct, State Key Lab Coordinat Chem, 22 Hankou Rd, Nanjing 210093, Jiangsu, Peoples R China

[ 5 ] Northwest Univ, Sch Chem & Engn, Shaanxi R&D Ctr Biomat & Fermentat Engn, Shaanxi Key Lab Degradable Biomed Mat, 229 Taibai North Rd, Xian 710069, Shaanxi, Peoples R China

[ 6 ] Nanjing Normal Univ, Coll Life Sci, 1 Wenyuan Rd, Nanjing 210046, Jiangsu, Peoples R China

ACS SUSTAINABLE CHEMISTRY & ENGINEERING，201809,6(9),12166-12175

ntimony sulfoiodide (SbSI) is commonly known as a prototypical ferroelectric semiconductor. We report herein a top-down strategy of ball-milling followed by size selective centrifugation to prepare SbSI nanocrystals (NCs). Taking the well dispersed SbSI NCs of the average size of 80 nm as photocatalyst, a record high visible light efficiency in photodegradation of methyl orange (MO) in water was achieved. By using a 300 W xenon lamp with a 420 nm cutoff filter and with the SbSI NCs of 1 g/L, the MO solution of 30 mg/L can be degraded similar to 99% in 10 s. The pseudo-first-order rate constant (k) of the photodegradation is k = 0.42 s(-1). For high concentrated MO of 150 mg/L, it can be similar to 99% degraded in 30 s at an elevated temperature of 65 degrees C (k = 0.15 s(-1)). With further increase of the SbSI NCs concentration to 4 g/L, the 150 mg/L MO can be similar to 99% degraded in 1 min at room temperature (k = 0.095 s(-1)). The small size of the SbSI NCs and efficient generation of singlet oxygen were found to be the key factors for the outstanding performance.

文章链接：

https://pubs.acs.org/doi/10.1021/acssuschemeng.8b02498