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为了获得高pH条件下Fenton体系的高效催化剂,选取了Fe~(2+)、Fe~(3+)、Co~(2+)、Ni~(2+)、Cu~(2+)、Zn~(2+)六种常见金属离子与邻菲罗啉(L)在摩尔质量分别为0.2 mol/L下等体积混合制备了配合物Fe(Ⅱ)L、Fe(Ⅲ)L、CuL、CoL、NiL和ZnL,评价了这6种配合物作为催化剂在高pH条件下催化H_2O_2氧化降解羟丙基瓜尔胶的效果。结果表明,该系列配合物都有一定的催化效果,其中CuL的催化效果最佳,在pH7.0~14.0的范围内均具有较好的催化效果。CuL催化H_2O_2降解羟丙基瓜尔胶的作用良好,在温度45℃、pH10、H_2O_2加量为羟丙基瓜尔胶质量的10.0%,催化剂CuL加量为H_2O_2质量5.0%的情况下降解反应40 min后,羟丙基瓜尔胶体系的相对黏度由14降低至1.2,与水黏度接近,相对分子质量从200万降至2864,COD值从22.49 g/L降至8.73 g/L,增加双氧水加量为羟丙基瓜尔胶质量的25.0%,降解4 h可将COD值降至41 mg/L。
In order to obtain an efficient catalyst for Fenton system at high pH, Fe 2+, Fe 3+, Co 2+, Ni 2+, Cu 2+, Zn 2+, (Ⅱ) L, Fe (Ⅲ) L, CuL and CoL were prepared by mixing the six common metal ions with phenanthroline (L) at an equal volume of 0.2 mol / , NiL and ZnL, and evaluated the effect of these six complexes as catalysts for the oxidative degradation of hydroxypropyl guar by H 2 O 2 as a catalyst at high pH. The results show that all the complexes have some catalytic effects, of which CuL has the best catalytic effect and has a good catalytic effect in the range of pH7.0 ~ 14.0. CuL catalyzed the degradation of hydroxypropyl guar by H 2 O 2 at 45 ℃, pH 10 and H 2 O 2 were 10.0% of the mass of hydroxypropyl guar and the amount of CuL was 5.0% of H 2 O 2 After 40 min, the relative viscosity of hydroxypropyl guar was decreased from 14 to 1.2, its viscosity was close to that of water, the relative molecular mass was reduced from 2 million to 2864, and the COD value decreased from 22.49 g / L to 8.73 g / L The amount of hydrogen peroxide was 25.0% of the mass of hydroxypropyl guar, and the COD value decreased to 41 mg / L after 4 h of degradation.