Comparing Photoactivities of Dissolved Organic Matter Released from Rice Straw-Pyrolyzed Biochar and Composted Rice Straw

被引：68

作者：

Liu, Yafang ^{[1
]}

Wang, Minli ^{[2
]}

Yin, Shujun ^{[1
]}

Xie, Lekai ^{[1
]}

Qu, Xiaolei ^{[2
]}

Fu, Heyun ^{[2
]}

Shi, Quan ^{[3
]}

Zhou, Feng ^{[1
]}

Xu, Fuliu ^{[1
]}

Tao, Shu ^{[1
]}

Zhu, Dongqiang ^{[1
]}

机构：

[1] Peking Univ, Sch Urban & Environm Sci, Key Lab, Minist Educ Earth Surface Proc, Beijing 100871, Peoples R China

[2] Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resource Reuse, Nanjing 210046, Jiangsu, Peoples R China

[3] China Univ Petr, Sch Chem Engn & Environm, State Key Lab Heavy Oil Proc, Beijing 102249, Peoples R China

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 2022年 / 56卷 / 04期

基金：

中国国家自然科学基金;

关键词：

photoactivity; photobleaching; comprehensive structural characterization; FT-ICR MS analysis; condensed aromatic rings; CHARGE-TRANSFER INTERACTIONS; TRIPLET EXCITED-STATES; BLACK CARBON; PHOTOCHEMICAL REACTIVITY; QUANTUM YIELDS; OPTICAL-PROPERTIES; SINGLET OXYGEN; CLIMATE-CHANGE; PHOTOOXIDATION; LIGNIN;

D O I：

10.1021/acs.est.1c08061

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

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.

引用

页码：2803 / 2815

页数：13