Page 216 - 《精细化工》2023年第6期
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第 40 卷第 6 期                             精   细   化   工                                  Vol.40, No.6
             20 23 年 6 月                             FINE CHEMICALS                                 June  2023


              水处理技术与环境保护
                硫修饰的多孔 Co O 活化过一硫酸盐降解亚甲基蓝
                                                   4
                                              3

                                                                      *
                            沈海丽,夏   强,廖小刚,李   纲 ,田   甜,李红梅
                                        (重庆理工大学  化学化工学院,重庆  400054)


                 摘要:以 Na 2 S 2 O 3 为硫源,采用改进的草酸盐-热解法制备了一系列硫修饰的 Co 3 O 4 多孔催化剂〔S x @Co 3 O 4 ,
                 x=0.25、0.50、0.75、1,x 为硫的修饰量,以 Co(NO 3 ) 2 •6H 2 O 的物质的量为基准,下同〕。以亚甲基蓝(MB)
                 为降解模型,考察了不同催化剂活化过一硫酸盐(PMS)的性能。探讨了催化剂用量、PMS 浓度、反应温度、
                 常见阴离子种类在 S x @Co 3 O 4 -PMS 体系下对 MB 降解率的影响,并评价了催化剂的循环稳定性。结果表明,随
                                                                                              2–
                 着硫修饰量的增加,Co 3 O 4 的催化性能逐渐升高,S 1 @Co 3 O 4 表现出最佳的催化性能。硫元素以 SO 4 的形式键合
                                                                            –
                 在 Co 3 O 4 的表面,使 Co 3 O 4 比表面积增大、表面氧空位含量增多及对 HSO 5 的极化增强,三者综合作用增强了
                 Co 3 O 4 的催化性能。在催化剂用量 0.04 g/L、PMS 浓度 0.6 mmol/L、反应温度 25  ℃,反应时间 25 min 的最优条
                 件下,S 1 @Co 3 O 4 -PMS 体系对 500 mL 质量浓度为 10 mg/L MB 溶液的降解率高达 98.35%。S 1 @Co 3 O 4 可通过简
                 单的方式回收利用,在连续 4 次循环使用后,其对 MB 的降解率仍可达 68.57%。MB 在 S 1 @Co 3 O 4 -PMS 体系中
                                                         1
                                            –
                                  –
                 的降解是自由基(•SO 4 、•OH 和•O 2 )和非自由基( O 2 )共同作用的结果。
                 关键词:硫修饰;Co 3 O 4 ;非均相催化;过一硫酸盐;亚甲基蓝;水处理技术
                 中图分类号:X131.2      文献标识码:A      文章编号:1003-5214 (2023) 06-1366-10


                       Sulfur-modified porous Co 3O 4 in activating peroxymonosulfate
                                        for degradation of methylene blue


                                                                        *
                          SHEN Haili, XIA Qiang, LIAO Xiaogang, LI Gang , TIAN Tian, LI Hongmei
                  (College of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 400054, China)


                 Abstract: A series of sulfur-modified porous Co 3O 4 [S x@Co 3O 4, x=0.25, 0.50, 0.75, 1, where x represents
                 the modified content  of sulfur,  based  on the molar amount  of Co(NO 3) 2•6H 2O, the  same below]  via an
                 improved oxalate-pyrolysis method  with  Na 2S 2O 3 as sulfur  source.  The catalytic performance of the
                 catalysts obtained in activation of peroxymonosulfate (PMS) for methylene blue (MB) degradation was then
                 investigated,  followed  by evaluation on the influence of catalyst dosage,  PMS concentration,  reaction
                 temperature, and common anion species on the degradation rate of MB in the S x@Co 3O 4-PMS system as
                 well as the cyclic stability of the catalyst. The results showed that the catalytic performance of Co 3O 4 was
                 improved  with the sulfur-modified content increased, and  S 1@Co 3O 4 exhibited the best catalytic
                                                                                                       2–
                 performance among the catalysts obtained. Sulfur  bonded to the surface  of Co 3O 4 in the form of SO 4
                 increased the  specific surface area of Co 3O 4, the content of oxygen  vacancies on the surface and the
                                  –
                 polarization of  HSO 5, the combined of  which enhanced the catalytic performance of  Co 3O 4. Under the
                 optimal reaction conditions of catalyst dosage  0.04  g/L, PMS concentration  0.6 mmol/L, reaction
                 temperature 25  ℃, and reaction time 25 min, the degradation rate of 500 mL MB solution with a mass
                 concentration of 10 mg/L reached 98.35% in S 1@Co 3O 4-PMS system. S 1@Co 3O 4 could be recycled in a
                 simple way and the  degradation  ratio  of MB could reach 68.57% after four consecutive cycles. The
                 degradation of MB in S 1@Co 3O 4-PMS system was the result of synergistic effect between free radicals


                 收稿日期:2022-10-06;  定用日期:2023-02-09; DOI: 10.13550/j.jxhg.20220900
                 基金项目:重庆市教委科学技术研究项目(KJQN202101102);重庆理工大学科研项目(2022CX034、2022CX071、gzlcx20223170)
                 作者简介:沈海丽(2000—),女,硕士生,E-mail:2477653032@qq.com。联系人:李   纲(1981—),男,副教授,E-mail:
                 ligang2015@cqut.edu.cn。
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