Boosting conversion efficiency of lignite to oxygen-containing chemicals by thermal extraction and subsequent oxidative depolymerization

Electropolymerization reaction-driven 2,6-naphthalenediamine monomers to a multilayered sheet structure for ultralong cycling aqueous zinc-ion batteries

“…40 The C-g and C-h centered at 57.9 and 50.84 ppm are assigned to the C-atoms in quinone, while the C-j and C-k may be assigned to the C-atoms connected with the hydroxide radical. 41,42 According to the above analysis, the most probable bond connection mode for 2,6-NAPD after electrochemical oxidation is poly(2,6-diamino-1,4-naphthalenedione) as shown in Fig. 4(a).…”

Production of humic and fulvic acid analogs through the ultrasonication of low-rank lignite coals

“…However, higher yields have been also reported in the literature on an ash-free feedstock such as Wu et al who reported a yield of 40% of humic acids from the thermal extraction residue from Xilinguole lignite. 60…”

Achieving full-color emission in coal-based humic acid derived carbon dots through intradot aggregation

“…The detailed preparation process can be found in our previously published work. 32 The element analysis results of CBHA are as follows: 54.22% carbon, 40.25% oxygen, 2.89% hydrogen, 1.12% nitrogen and 1.52% sulphur. N , N -Dimethylformamide (DMF) and quinine sulfate were obtained from Sinopharm Chemical Reagent Co, Ltd (Shanghai, China).…”

“…As we all know, humic acid is a heterogeneous organic acidic substance widely found in nature, and mainly consists of aromatic and alicyclic rings connected to carboxyl, hydroxyl, carbonyl, and other functional groups. 31,32 Coal is the main source of commercial humic acid, which can be produced by alkali extraction or artificial oxidization (e.g. treated with air).…”

“…Compared with natural humic acids, CBHA contains more aromatic carbon (sp 2 hybridized carbon) besides abundant oxygen-containing groups. 32 So CBHA is an ideal block to assemble fluorescent CDs because it is inexpensive and readily available. In this work, we use a simple method to synthesize CPDs from CBHA by solvothermal treatment in N , N -dimethylformamide (DMF) under an O 2 atmosphere.…”