摘要：Here, we systematically compared the photoactivity and photobleaching behavior between dissolved black carbon (DBC) from rice straw biochar and leached dissolved organic carbon (LDOC) from rice straw compost using complementary techniques. The Fourier transform-ion cyclotron resonance mass spectrometry (FT-ICR MS) analysis showed that DBC was dominated by polycyclic aromatic (55.1%) and tannin-like molecules (24.1%), while LDOC was dominated by lignin-like (58.9%) and tannin-like molecules (19.7%). Under simulated sunlight conditions, DBC had much higher apparent quantum yields for (DOM)-D-3* and O-1(2) but much lower apparent quantum yields for (OH)-O-center dot than LDOC. After a 168 h irradiation, the total number of LDOC formulas identified by FT-ICR MS decreased by 40.1% with concurrent increases in O/C and H/C ratios and also decreases in double bond equivalence minus oxygen (DBE - O) and average molecular weight identified by gel permeation chromatography. However, despite the large decreases in UVA(254) and DOC, the total number of DBC formulas decreased only by 12.0% with nearly unchanged O/C ratio, DBE - O values, molecular weight distribution, and benzenepolycarboxylic aromatic condensation (BACon) index regardless of the decreased percentage of condensed aromatic carbon (ConAC %). Compared with LDOC, the photolysis of DBC was much less oxidative and destructive mainly via breakup of a small portion of the highly condensed aromatic rings, probably accompanied by photodecarboxylation.

关键字：photoactivity; photobleaching; comprehensive structural characterization; FT-ICR MS analysis; condensed aromatic rings

ISSN号：0013-936X

卷、期、页：卷: 56期: 4页: 2803-2815

发表日期：2022-02-15

影响因子：9.028500

期刊分区（SCI为中科院分区）：一区

发表期刊名称：ENVIRONMENTAL SCIENCE & TECHNOLOGY

参与作者：刘亚芳,王敏丽,尹书君,谢乐开,瞿晓磊,付翯云,周丰,徐福留 ,陶澍,朱东强

第一作者：史权

论文类型：期刊论文

论文概要：刘亚芳,王敏丽,尹书君,谢乐开,瞿晓磊,付翯云,史权,周丰,徐福留 ,陶澍,朱东强，Comparing Photoactivities of Dissolved Organic Matter Released from Rice Straw-Pyrolyzed Biochar and Composted Rice Straw，ENVIRONMENTAL SCIENCE & TECHNOLOGY，2022，卷: 56期: 4页: 2803-2815

论文题目：Comparing Photoactivities of Dissolved Organic Matter Released from Rice Straw-Pyrolyzed Biochar and Composted Rice Straw