钼离子掺杂g-C3N4纳米片光催化剂降解黄药废水的研究

采用热聚合法合成体相g-C3N4,采用球磨法结合空气氧化蚀刻法制备Mo/g-C3N4二维纳米片。通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)、X射线衍射能谱(EDS)、傅里叶变换红外光谱(FTIR)、紫外-可见吸收光谱(UV-Vis)、光致发光谱(PL)对Mo/g-C3N4二维纳米片形貌结构及光学特性等进行分析,结果表明:Mo离子成功掺杂到二维g-C3N4纳米片晶格中,拓宽了光谱响应范围,提高了量子传输效率。以异丁基钠黄药溶液模拟选矿废水,探索了二维Mo/g-C3N4纳米片对黄药的光催化降解性能。研究表明,异丁基钠黄药初始浓度为50 mg/L、溶液p H=7、降解时间6 h条件下,Mo/g-C3N4对异丁基钠黄药的降解率为90.12%,循环5次后,降解率仍可达81.2%,Mo/g-C3N4纳米片光催化稳定性好。

Study on Degradation of Xanthate-containing Mining Wastewater by Molybdenum Ion Doped g-C3N4 Nanosheet Photocatalyst

Pure phase g-C3N4 was synthesized by thermal polymerization， and Mo/g-C3N4 two-dimensional nanosheets were prepared by ball milling combined with air oxidation etching by use of X-ray diffractometer（XRD）， scanning electron microscope（SEM）， X-ray diffraction spectroscopy（EDS）， Fourier transform infrared spectroscopy（FTIR）， UV-visible absorption spectroscopy（UV-Vis）and photoluminescence spectroscopy（PL） to characterize Mo/g-C3N4 two-dimensional nanosheets. The results show that Mo ions are successfully doped into the two-dimensional g-C3N4 nanosheet lattice， which broaden spectral response range and improve quantum transmission efficiency. The photocatalytic degradation activity of two-dimensional Mo/g-C3N4 nanosheets was explored by simulating the ore dressing wastewater with isobutyl sodium xanthate solution. The results showed that the degradation rate of isobutyl sodium xanthate was 90.12% by Mo/g-C3N4 nanosheets under the conditions of pH=7， initial concentration of xanthate 50 mg/L and degradation time of 6 h，by five times circulation，the degradation rate can also up to 81.2%.The photocatalysis stability of Mo/g-C3N4 is well.