Environmental factors of influencing the photodegradation ofsulfadiazine by humic acid mediated system
LIU Chang1,2, WANG Bin1,2, ZENG Dan1,2, CHEN Shu1,2, SHEN Xia1,2, HUANG Sha1,2
1. School of Environment and Resource, Southwest University of Science and Technology, Mianyang 621010, China;
2. Key Laboratory of Solid Waste Treatment and Resource Recycle, Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China
This experiment studied the influence of some environmental factors, including various concentration of sulfadiazine (SDZ), paddy soil humic acid (SDHA), and peat soil humic acid (NTHA), different pH values, photosensitive ions (NO3- and Fe3+), ionic strength, and metal ions (Ca2+, Mg2+ and K+) on the photodegradation of SDZ in pure water and two separate sources of HA solution. The results showed that under the condition of pH=7.1, the photodegradation of SDZ has been promoted in both systems and had the best effect. The photolysis rate of SDZ was speeded up under the condition of low SDZ (2mg/L) and low HA concentration (15mg/L). Photosensitive ions NO3- promoted the photolysis of SDZ in pure water by light producing·OH, but in HA systems, HA could inhibit OH and cause the photolysis rate of SDZ to be lower than that in pure water; Fe3+ exhibited inhibition in HA systems, and the intensity was NTHA>SDHA. The photolysis rate of SDZ in pure water increased when the concentrations of NaCl became higher, under HA systems, the inhibition effect was stronger under the lower concentration of NaCl (CNaCl=50mmol/L). The metal ions (K+, Ca2+, and Mg2+) in pure water had a weak inhibition effect on the photolysis of SDZ, but K+ clearly showed inhibition in HA systems. The inhibition intensity was K+ > Ca2+ > Mg2+. The effect of monovalent cation on SDZ photodegradation was more significant.
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