Coal-based carbon quantum dots/carbon nitride composites for photocatalytic CO2 reduction

doi:10.11949/0438-1157.20200096

Abstract

Abstract:

Using Taixi anthracite as a raw material, coal-based carbon quantum dots (C-CQDs) were prepared by chemical oxidation, and C-CQDs and urea were used as precursors to prepare coal-based carbon quantum dots/carbon nitride (C-CQDs /g-C₃N₄) composite materials. The composition and structure of the samples were characterized by means of TEM, XRD, FT-IR, UV-Vis and PL respectively, and the phoyocatalytic potential were assessed in terms of reduction CO₂ into methanol under visible light irradiation. The results show that the C-CQDs were uniformly decorated on the surfaces of the C-CQDs/g-C₃N₄ composite, and the C-CQDs/g-C₃N₄ exhibited superior photoactivity, the methanol yield up to 28.69 μmol/(g cat), which is about 2.2 times in comparison with that of pure graphite carbon nitride (g-C₃N₄) in photocatalytic CO₂ reduction.

Key words: coal, g-C₃N₄, catalyst, photochemistry, carbon dioxide, methanol

摘要：

以太西无烟煤为原料，采用化学氧化法制备煤基碳量子点(C-CQDs)，进一步以C-CQDs和尿素为前体，原位复合制备得到煤基碳量子点/氮化碳(C-CQDs/g-C₃N₄)复合材料。采用TEM、XRD、FT-IR、UV-Vis、PL等手段对样品结构性能进行了表征和分析，进而考察了其在光催化还原CO₂合成甲醇过程的催化性能。研究表明：C-CQDs均匀地负载在g-C₃N₄的表面，且掺杂适量的C-CQDs有利于提高C-CQDs/g-C₃N₄的光催化活性，当可见光照12 h时，其光催化还原CO₂甲醇产量最高可达28.69 μmol/(g cat)，约为相同条件下纯石墨相g-C₃N₄作用时甲醇产量的2.2倍。

关键词: 煤, 氮化碳, 催化剂, 光化学, 二氧化碳, 甲醇

CLC Number:

TM 911

Ruizhe ZHANG, Keke LI, Kaibo ZHANG, Wei LIU, Lisi ZHENG, Yating ZHANG. Coal-based carbon quantum dots/carbon nitride composites for photocatalytic CO₂ reduction[J]. CIESC Journal, 2020, 71(6): 2788-2794.

张睿哲, 李可可, 张凯博, 刘薇, 郑莉思, 张亚婷. 煤基碳量子点/氮化碳复合材料制备及其光催化还原CO₂性能[J]. 化工学报, 2020, 71(6): 2788-2794.

Figures/Tables 8

Table 1 Proximate and ultimate analysis of sample

太西煤	工业分析/%(质量)			元素分析/%(质量)
太西煤	M_ad	A_d	V_daf	C	H	N	O
原煤	1.15	3.38	8.53	93.10	3.17	0.40	3.30
脱灰煤	1.00	0.33	9.88	91.18	3.92	0.50	3.30

Fig.1 Reaction system of photocatalytic CO2 reduction

Fig.2 TEM images of C-CQDs[(a),(b)], g-C3N4 (c) and C-CQDs/g-C3N4-3 (d)

Fig.3 XRD patterns of g-C3N4 and C-CQDs/g-C3N4-3

Fig.4 FT-IR spectra of g-C3N4 and C-CQDs/g-C3N4-3

Fig.5 UV-Vis spectra of g-C3N4 and C-CQDs/g-C3N4-3

Fig.6 PL spectra of g-C3N4 and C-CQDs/g-C3N4-3

Fig.7 Photocatalytic conversion of CO2 into methanol over the obtained g-C3N4 and C-CQDs/g-C3N4

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Coal-based carbon quantum dots/carbon nitride composites for photocatalytic CO₂ reduction

煤基碳量子点/氮化碳复合材料制备及其光催化还原CO₂性能

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