In this work, visible light-active sulphur doped graphitic carbon nitride coupled with Ni–Fe layered double hydroxide (SGCN/Ni–Fe LDH) was prepared through co-precipitation procedure using commercially available thiourea, nickel nitrate, and ferric nitrate. The surface morphology characterization showed LDH crystallite growth onto the surface of SGCN, exploiting the delocalized π-electrons of graphitic structure to attain chemical stability. The synthesized photocatalyst exhibited 98% 2,4-dinitrophenol (DNP) photodegradation within 120 min of visible light irradiations, which was surprisingly high compared to 60 and 55% obtained for bare GCN and Ni–Fe LDH samples. This photo removal efficiency could be due to suitable bandgap energy, layered graphitic and brucite Ni–Fe layered structures, and sufficient pollutant adherence to active sites provided by incorporation of S dopant into bare GCN. The characterization results obtained by cyclic voltammetry graph photoluminescence and electrochemical impedance spectra indicated minimum charge carrier recombination due to the type-II charge transfer route along with an active generation of ⋅O₂⁻ and h⁺ as dominant reactive species participating in DNP mineralization into more unaffected inorganic ions. The photocatalytic activity enhanced in an acidic medium at optimized parameters, i.e., pH 4, photocatalyst dosage 50 mg in 50 mL solution, and DNP concentration 1.0 × 10⁻⁴ mol/dm³, due to ionic interactions between negatively charged DNP and positive intercalated structure of Ni–Fe LDH. The as-prepared photocatalyst photodegradation ability was retained after 5 catalytic cycles, confirming its environmentally-compatible usage in water treatment.

在这项工作中，使用市售的硫脲，硝酸镍和硝酸铁通过共沉淀程序制备了可见光活性硫掺杂的石墨氮化碳与Ni-Fe层状双氢氧化物（SGCN / Ni-Fe LDH）偶联。表面形态表征表明LDH微晶生长在SGCN表面，利用石墨结构的离域π电子获得化学稳定性。合成的光催化剂在可见光照射的120分钟内显示98％的2,4-二硝基苯酚（DNP）光降解，与裸露的GCN和Ni-Fe LDH样品获得的60％和55％相比，这令人惊讶地高。去除这种光的效率可能是由于合适的带隙能量，层状石墨和水镁石Ni-Fe层状结构，通过在裸露的GCN中掺入S掺杂剂，使污染物对活性位具有足够的附着力。通过循环伏安图的光致发光和电化学阻抗谱获得的表征结果表明，由于II型电荷转移途径以及活性氧的产生，最小的载流子复合₂ ^-和H ⁺作为参与DNP矿化成更不受影响无机离子占主导地位的反应性物质。由于带负电荷的DNP和正嵌入的DNP之间存在离子相互作用，在优化的参数（即pH 4、50 mL溶液中的光催化剂剂量为50 mg，DNP浓度为1.0×10 ^-4  mol / dm ^3）下，在酸性介质中的光催化活性增强。Ni-Fe LDH的结构。经过5个催化循环后，仍保留了所制备的光催化剂的光降解能力，从而证实了其在水处理中的环境相容性。