高等学校化学学报 ›› 2024, Vol. 45 ›› Issue (3): 20230416.doi: 10.7503/cjcu20230416

• 材料化学 • 上一篇    下一篇

基于含铬革屑制备吸附-降解型胶原/ZnO复合材料

田振华1,2,3(), 高盼盼1, 于若泓1, 赵文杰1   

  1. 1.陕西科技大学轻工科学与工程学院,
    2.轻化工程国家级实验教学示范中心, 西安 710021
    3.兴业皮革科技股份有限公司, 泉州 362000
  • 收稿日期:2023-09-19 出版日期:2024-03-10 发布日期:2023-12-19
  • 通讯作者: 田振华 E-mail:tian_amb@163.com
  • 基金资助:
    中国博士后科学基金(2022M722668);国家自然科学基金(22278256);西安市科学技术协会青年人才托举计划项目(959202313003)

Preparation of Adsorption-degradation Collagen/ZnO Composites Based on Chrome-tanned Leather Shavings

TIAN Zhenhua1,2,3(), GAO Panpan1, YU Ruohong1, ZHAO Wenjie1   

  1. 1.College of Bioresources Chemical and Materials Engineering
    2.National Demonstration Center for Experimental Light Chemistry Engineering Education,Shaanxi University of Science & Technology,Xi’an 710021,China
    3.Xingye Leather Technology Co. ,Ltd. ,Quanzhou 362000,China
  • Received:2023-09-19 Online:2024-03-10 Published:2023-12-19
  • Contact: TIAN Zhenhua E-mail:tian_amb@163.com
  • Supported by:
    the Postdoctoral Science Foundation of China(2022M722668);the National Natural Science Foundation of China(22278256);the Young Talent Fund of Xi’an Association for Science and Technology, China(959202313003)

摘要:

危险废弃物含铬革屑的资源化利用是制革行业面临的一大难题. 含铬革屑的主要成分胶原可作为吸附材料, 但存在稳定性差、 需解吸等问题, 限制了其在水处理领域的应用. 本文通过酸法从含铬革屑中提取胶原纤维并原位负载纳米氧化锌(ZnO)制备了吸附-降解型胶原/ZnO复合材料. 红外光谱及X射线衍射谱图显示, ZnO成功负载且呈片状, 具有六角纤锌矿晶型, 负载到胶原纤维上后并不会影响其自身的光响应范围, 禁带宽度为3.20 eV. 当锌前驱体溶液浓度为0.12 mol/L、 胶原纤维分散液pH值为8、 胶原海绵质量为60 mg时, 复合材料光催化性能最佳; 在160 min内对10 mg/L亚甲基蓝(MB)的降解率达95.2%; 循环5次后, 降解率依然可达到87.5%. 动力学模型拟合结果显示, 复合材料对MB的吸附更符合拟二级吸附动力学模型, 受化学吸附控制; MB的光催化降解过程符合一级降解动力学方程, 降解速率最高为0.0172 min-1. 此外, ZnO的引入提高了复合材料的抗菌性和热稳定性.

关键词: 胶原, 氧化锌, 亚甲基蓝, 吸附性能, 光催化降解

Abstract:

The utilization of hazardous waste chrome-tanned leather shavings is a difficult problem in the leather industry. Collagen, the main component of chrome-tanned leather shavings, can be used as adsorbent material; however, its application in the wastewater treatment field is limited due to the low stability and subsequent desorption challenges. In this paper, adsorption-degradation collagen/ZnO composites were prepared by in⁃situ loading of zinc oxide nanoparticles(ZnO) on collagen fibrils extracted from chrome-tanned leather shavings via acid methods. The infrared and X-ray diffraction spectra showed that ZnO with sheet hexagonal wurtzite structure was successfully loaded; meanwhile, its own photoresponse range was unaffected and the forbidden bandwidth was 3.20 eV. When the concentration of zinc precursor solution was 0.12 mol/L, the pH value of collagen fibril dispersion liquid was 8 and the mass of collagen sponge was 60 mg, the photocatalytic degradation of the composite was the best; namely, the degradation ratio of 10 mg/L methylene blue(MB) reached 95.2 % within 160 min and still reached 87.5% after five cycles. The fitting results of the kinetic models showed that the adsorption of MB by the composites was according with the pseudo-second-order adsorption kinetic model, which was controlled by chemisorption; moreover, the photocatalytic degradation of MB obeyed the first-order degradation kinetic model, and the highest degradation rate was 0.0172 min-1. Additionally, the introduction of ZnO enhanced the antimicrobial property and thermal stability of the collagen/ZnO composites.

Key words: Collagen, ZnO, Methylene blue, Adsorption performance, Photocatalytic degradation

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