摘要
以漂白针叶木浆(SBKP)为载体,负载CuO-ZnO后炭化,制备得到了纤维素纤维先负载后炭化的CuO-ZnO-生物炭(CuO-ZnO-C_(L+C))复合材料。通过扫描电子显微镜(SEM)、电感耦合等离子体质谱(ICP-MS)、X射线衍射(XRD)、双恒电位仪和真空光催化还原CO_(2)系统,考察了载体负载、炭化的先后顺序对复合材料中CuO-ZnO负载的影响,结果表明:先炭化后负载的生物炭(C_(C+L))与CuO、ZnO只是物理混合作用,其表面没有羟基对催化剂进行吸附固定,极易发生团聚,由此制得的CuO-ZnO-C_(C+L)复合材料的CuO含量没有CuO-ZnO-C_(L+C)高,CuO-ZnO-C_(L+C)复合材料的晶型更完整、光电流强度更高、电阻更小,光催化还原CO_(2)活性更好。以CO得率为考察指标,探讨了Cu^(2+)与Zn^(2+)物质的量比值、复合材料炭化温度、纤维素纤维直径对所制备的CuO-ZnO-C_(L+C)的光催化性能的影响,结果表明:以SBKP为纤维素模板,在Cu^(2+)与Zn^(2+)物质的量比为1∶6,复合材料化温度为500℃时,制得的CuO-ZnO-C_(L+C)含碳量为64.86%,CuO和ZnO负载量分别为10.94%和26.50%,光催化还原CO_(2)为CO的得率达到0.22 mmol/(g·h),CH 4得率为0.043 mmol/(g·h),CO的选择性高达83.7%。
The cellulose fiber that was first-loaded and then carbonized CuO-ZnO-biochar(CuO-ZnO-C_(L+C))composites,was prepared using softwood bleached kraft pulp(SBKP)as the carrier and loading CuO-ZnO followed by carbonization.The effects of carrier loading and the sequence of carbonization on the CuO-ZnO loading in the composites were investigated by scanning electron microscope(SEM),inductively coupled plasma mass spectrometry(ICP-MS),X-ray diffraction(XRD),dual constant potential instrumentation,and vacuum photocatalytic reduction of CO_(2) system.The results showed that the carbonized and then loaded biochar(C_(C+L))was only physically mixed with CuO and ZnO,and there was no hydroxyl group on its surface to adsorb and immobilize the catalyst.It was very easy to agglomerate,and the CuO content of the resulting CuO-ZnO-C_(C+L) composite was not as high as CuO-ZnO-C_(L+C).The crystalline shape of the CuO-ZnO-C_(L+C) composite was more complete,with higher photocurrent intensity,smaller resistance,and better photocatalytic reduction of CO_(2) activity.The effects of the ratio of the amount of Cu^(2+)to Zn^(2+),the carbonization temperature of the composites,and the diameter of the cellulose fibers on the prepared CuO-ZnO-C_(L+C) were investigated with CO yield as the index.The results showed that:when SBKP was used as the cellulose template under the condition of the molar ratio of Cu^(2+)to Zn^(2+)of 1∶6 and the compositing temperature of 500℃,the prepared CuO-ZnO-C_(L+C) contained 64.86%carbon,CuO and ZnO loadings were 10.94%and 26.50%,respectively,and the yield of photocatalytic reduction of CO_(2) to CO reached a maximum value of 0.22 mmol/(g·h),CH 4 yield was 0.043 mmol/(g·h),with a selectivity of CO as high as 83.7%.
作者
何贤
石纯
宰振强
田雅慧
马金霞
HE Xian;SHI Chun;ZAI Zhenqiang;TIAN Yahui;MA Jinxia(College of Light Industry and Food,Nanjing Forestry University,Jiangsu Provincial Key Laboratory of Pulp and Paper Science and Technology,Nanjing 210037,China)
出处
《林产化学与工业》
CAS
CSCD
北大核心
2023年第5期41-48,共8页
Chemistry and Industry of Forest Products
基金
国家自然科学基金资助项目(31870565)。
