Biogenic iron mineral formation and the fate of arsenic driven by its coupling with ferrous iron in acid mine drainage environment.

Acid mine drainage (AMD) containing arsenic produced during coal mining is a global environmental problem. However, the coupled driving process of the key element Fe and the associated element As in the AMD environment has received little attention. Therefore, in this study, we investigated the A.

Degradation of enrofloxacin by Fe activated PDS.

In this paper, the effect of zero-valent iron (Fe) activated persulfate (PDS) on the removal of enrofloxacin (ENR) was investigated, and the effect and mechanism were analyzed by exploring the effects of Fe concentration, PDS concentration, pH, and the influence of anion and aqueous matrix on the removal of ENR by the Fe/PDS system. The results showed that when [ENR] = 20 µmol/L, [Fe] = 0.15 g/L, [PDS] = 0.

Effect of biochars with different particle sizes on fates of antibiotics and antibiotic resistance genes during composting of swine manure.

The impact of biochars with large particle sizes (LPB, 5-10 mm) and small particle sizes (SPB, <0.074 mm) on fates of antibiotics and antibiotic resistance genes (ARGs) during composting of swine manure with maize straw was explored. The results showed that antibiotics removal efficiencies were 40 %, 50 %, and 76 % for control treatment, control with LPB treatment, and control with SPB treatment after composting, respectively.

Degradation of ciprofloxacin by persulfate activated with pyrite: mechanism, acidification and tailwater reuse.

Residues of ciprofloxacin (CIP) in the environment pose a threat to human health and ecosystems. This study investigated the degradation of CIP by persulfate (PS) activated with pyrite (FeS). Results showed that when [CIP] = 30 μM, [FeS] = 2.

Effect of biochar on antibiotics and antibiotic resistance genes variations during co-composting of pig manure and corn straw.

Pig manure is a reservoir of antibiotics and antibiotic resistance genes (ARGs). The effect of biochar on the variations in physicochemical properties, bacterial communities, antibiotics, ARGs, and mobile genetic elements (MGEs) of compost product during co-composting of pig manure and corn straw have been investigated in this study. Compared with the control treatment (CK), biochar addition accelerated the increase in pile temperature and prolonged the high temperature period (>55°C) for 2 days.

Degradation of methyl orange by pyrite activated persulfate oxidation: mechanism, pathway and influences of water substrates.

Degradation mechanism of methyl orange (MO), a typical azo dye, with pyrite (FeS) activated persulfate (PS) was explored. The results showed that when the initial concentration of MO was 0.1 mM, FeS was 1.

Effect of pH regulation on the formation of biogenic schwertmannite driven by and its arsenic removal ability.

The effect of pH regulation on schwertmannite bio-synthesis and its As removal ability were investigated in this study. The total Fe precipitation efficiency in a conventional schwertmannite bio-synthesis system (CK) reached 26.5%, with a mineral weight of 5.

Effect of microbial nutrients supply on coal bio-desulfurization.

Research on coal desulfurization is very important for economic, social, and environmentally sustainable development. In this study, three batches of shake flask experiments were conducted for coal bio-desulfurization using Acidithiobacillus ferrooxidans to explore the relationship between microbial nutrients (iron-free M9 K medium) supply and coal bio-desulfurization efficiency. The results showed that the removal rates of pyritic sulfur and total sulfur from coal effectively increased following reintroduction of coal into the filtrate from previous batch.

The degradation of oxytetracycline with ferrous oxalate under different light irradiation.

Degradation of OTC under different light with Fe/ was investigated, and the reaction mechanism was also discussed. Although Fe(II/III)- complex could weaken the inhibitory effect of Fe(II/III)-OTC complex on the detection of OTC by HPLC, the acidification could make inhibition become minimal. Response surface methodology was used to optimize the Fe/ dosage at low concentrations of Fe and HCO.

Effects of Acid Mine Drainage on Calcareous Soil Characteristics and L. Germination.

Acid mine drainage (AMD) is a serious environmental problem resulting from extensive sulfide mining activities. There is a lack of more comprehensive and detailed studies on the effect of AMD on calcareous soil characteristics and seed germination. In this study, five calcareous soil samples, collected from Xiaoyi, Taigu, Xiangning, Hejin, and Xixian counties in Shanxi Province, China, were used to investigate the effects of acid AMD on soil characteristics and L.

Photodegradation of carbamazepine with BiOCl/FeO catalyst under simulated solar light irradiation.

A magnetic BiOCl/FeO catalyst with simulated solar light response was successfully prepared through a precipitation process and characterized by X-ray diffraction, scanning electron microscopy, UV-vis diffuse reflectance spectroscopy, VSM, Brunauer-Emmett-Teller, X-ray photoelectron spectroscopy. The photocatalytic activity of BiOCl/FeO nanocomposites was further investigated through the photodegradation efficiency of carbamazepine (CBZ). In this study, 90.

Reaction Mechanism of 4-Chlorobiphenyl and the NO Radical: An Experimental and Theoretical Study.

Experiment and theoretical chemistry calculations were conducted to elucidate the mechanism of the reaction between 4-chlorobiphenyl (4-CB) and the NO radical. The degradation of PCBs was investigated mechanistically through transient absorption spectroscopy technology and high-accuracy theoretical calculation by using 4-CB as the model. Laser flash photolysis (LFP) experiments were performed at 355 nm.

Degradation of sunscreen agent p-aminobenzoic acid using a combination system of UV irradiation, persulphate and iron(II).

Increased usage and discharge of sunscreens have led to ecological safety crisis, and people are developing the advanced oxidation processes (AOPs) to treat them. The present study aimed to determine the degradation efficiency and mechanism of the sunscreen agent p-aminobenzoic acid (PABA) using the UV/Fe(2+)/persulphate (PS) method. A series of irradiation experiments were conducted to optimise the system conditions and to study the impacts of the natural anion.