The anatase–rutile TiO₂/g-C₃N₄ (denoted as ARC) photocatalyst with hierarchical porous structure is synthesized via an impregnation-calcination method utilizing TiCl₄ and melamine as precursor. The content of g-C₃N₄, and the relative content of the anatase and rutile in ARC can be regulated via controlling the dosage of melamine. Furthermore, the highly acidic environment producing by hydrochloric acid which is generated via hydrolysis reaction of TiCl₄ has significantly impact for forming the hierarchical porous structure of ARC. Comparing with g-C₃N₄, the specific surface area of ARC-5 (61.2 m²·g⁻¹) is 7.2 times than that of g-C₃N₄. Among all the resultant composites, the ARC-5 exhibits the highest visible-light photocatalytic property for degrading tetracycline hydrochloride (TC-HCl, 10 mg·L^-1). The degradation rate of TC-HCl is 92% in 60 min with ARC-5 as photocatalyst, and the kinetic constant (k) of ARC-5 is 4.4 times than that of g-C₃N₄. The favorable catalytic property of ARC-5 should be attributed to the close-knit interface contact and high surface area, which could broaden the spectra absorption range, facilitate the carriers separation, provide more active sites and enhance the transfer rate of reactant and product. Moreover, radical trapping experiments shows that h⁺ and •O₂^– have vital function for degrading TC-HCl.

以TiCl ₄和三聚氰胺为前驱体，通过浸渍-煅烧方法合成了具有分级多孔结构的锐钛矿-金红石TiO ₂ /gC ₃ N ₄（表示为ARC）光催化剂。ARC中gC ₃ N ₄的含量以及锐钛矿和金红石的相对含量可以通过控制三聚氰胺的用量来调节。此外，TiCl ₄水解反应产生的盐酸所产生的高酸性环境对ARC的分级多孔结构的形成有显着影响。与 gC ₃ N ₄相比，ARC-5 的比表面积 (61.2 m² ·g ^-1 ) 是gC ₃ N _{4 的}7.2倍。在所有合成的复合材料中，ARC-5 在降解四环素盐酸盐（TC-HCl，10 mg·L ^-1）方面表现出最高的可见光光催化性能。以ARC-5为光催化剂,TC-HCl在60 min内降解率为92%,ARC-5的动力学常数(k)是gC ₃ N _{4 的}4.4倍. ARC-5 良好的催化性能应归因于紧密的界面接触和高表面积，这可以拓宽光谱吸收范围，促进载流子分离，提供更多的活性位点，提高反应物和产物的转移速率。此外，自由基捕获实验表明，h ⁺和•O ₂ ^–对降解TC-HCl 具有重要作用。