Phenanthrene contaminated soil was remediated by the photochemical process of ferrous oxalate. Without using H₂O₂ and adjusting soil pH, phenanthrene in contaminated soil was degraded effectively by the ferrous oxalate under visible light irradiation. Ferrous oxalate possesses excellent visible light absorption ability which benefits the degradation of phenanthrene in soil under visible light irradiation. Via the Fe(II)/Fe(III) catalytic cycle of ferrous oxalate, H₂O₂ and Fe(II) could be produced continuously and H₂O₂ was further catalyzed by Fe(II) and released hydroxyl radicals (•OH) to degrade the phenanthrene in soil. The dosage of ferrous oxalate, moisture content of soil, and soil thickness were most important factors for degradation of phenanthrene in soil. In addition, a good mixing of ferrous oxalate and soil was vital for enhancing the degradation ratio of phenanthrene. After phenanthrene contaminated soil was treated by ferrous oxalate, the toxicity of treated soil was evaluated via the lettuce cultivation experiments. It was demonstrated the toxicity of phenanthrene contaminated soil was significantly reduced by ferrous oxalate according to the growth indexes of lettuces, including root length, leaf length, and fresh weight. This environment-friendly soil remediation method based on ferrous oxalate has huge potential in the remediation of organic pollutant contaminated soil.

草酸亚铁的光化学过程修复了被菲污染的土壤。在不使用H ₂ O ₂和调节土壤pH的情况下，草酸亚铁在可见光照射下可有效降解污染土壤中的菲。草酸亚铁具有出色的可见光吸收能力，有利于可见光照射下土壤中菲的降解。通过草酸亚铁的Fe（II）/ Fe（III）催化循环，可以连续产生H ₂ O ₂和Fe（II），并且H ₂ O ₂被Fe（II）进一步催化并释放羟基（•OH）以降解土壤中的菲。草酸亚铁的用量，土壤水分和土壤厚度是影响土壤中菲降解的最重要因素。此外，草酸亚铁和土壤的良好混合对于提高菲的降解率至关重要。用草酸亚铁处理被菲污染的土壤后，通过生菜栽培实验评估处理后土壤的毒性。结果表明，根据生菜的生长指标，包括根长，叶长和鲜重，草酸亚铁可显着降低菲污染的土壤的毒性。