Methylene blue molecules gone into micropore was the adsorption rate-limiting step, and MB adsorption by the waste paper-based adsorbent was a spontaneous, endothermic and randomly increasing adsorption. Simulated wastewater and regeneration experiments were also used to evaluate the adsorbent's treatment capacity and economic efficiency, and these results indicated that the adsorbent has good decolorization and regeneration ability.Hg0 catalytic oxidation is an attractive approach to reduce mercury emissions from industrial activities. However, the rational design of highly active catalysts remains a significant challenge.  https://www.selleckchem.com/products/talabostat.html  Herein, the charge distribution modulation strategy was proposed to design novel catalysts copper ferrite spinel-type catalysts were developed by introducing Cu2+ cations into octahedral sites to form electron-transfer environment. The synthesized catalysts with spinel-type stoichiometry showed superior catalytic performance, and achieved > 90 % Hg0 oxidation efficiency in a wide operation temperature window of 150-300 °C. The superior catalytic performance was closely associated with the mobile-electron environment of copper ferrite. Hg0 oxidation by HCl over copper ferrite followed the Eley-Rideal mechanism, in which physically adsorbed Hg0 reacted with active chlorine species. Density functional theory calculations revealed that octahedral Cu atom is the most active site of Hg0 adsorption on copper ferrite surface. Both direct oxidation pathway (Hg* → HgCl2*) and HgCl-mediated oxidation pathway (Hg* → HgCl* → HgCl2*) played important role in Hg0 oxidation over copper ferrite. HgCl2* formation was identified as the rate-limiting step of Hg0 oxidation. This work would provide a new perspective for the development of admirable catalysts with outstanding Hg0 oxidation performance.Surfactant-enhanced air sparging (SEAS) is an effective remediation technique for VOCs-contaminated soil. In this study, three types of tests are performed to investigate the effects of the surfactant injection position on the airflow pattern, contaminant removal efficiency, and airflow path control. The three tests are conventional air sparging (CAS), entire SEAS (ESEAS), where the surfactant is incorporated into the entire contaminated soil, and local SEAS (LSEAS), where the surfactant is injected locally at different positions. With increasing distance between the injection position and the central axis, the LSEAS test results approach the results measured in the CAS test. When the surfactant is injected directly at the central axis, a high contaminant removal rate of 89% is obtained, which is even higher than that obtained for the ESEAS test. As the injection position moves away from the central axis, the removal rate decreases. Furthermore, when the injection position is close to the sparging point, the surfactant can successfully control the airflow path. Based on the test results, a critical distance between the surfactant injection position and sparging point exists where high remediation efficiency can be achieved. This optimal surfactant injection position is specific to each contamination site.Persulfate (PS)-based oxidation technologies have been extensively employed for contaminant remediation, but the mechanisms of PS-mediated pollutant removal in soil under anaerobic conditions have not been fully explored. In this study, the degradation of DDTs (DDT and DDE) by thermally activated PS in a real contaminated soil was investigated. It was found that DDTs degradation could be achieved under both aerobic and anaerobic conditions, and anaerobic conditions were comparatively more efficient. Further analyses based on electron paramagnetic resonance (EPR), free radical quenching studies and degradation product identification showed that, oxidative radicals (SO4-/OH) were the major species responsible for DDTs degradation under aerobic conditions, while both reductive (persulfate radical S2O8-) and oxidative radicals were involved under anaerobic conditions. Furthermore, reductive degradation of DDT could also be observed in the presence of ethanol (EtOH) due to the formation of EtOH radical. In addition, DDT degradation was hardly affected by anions such as HCO3- and Cl- at anaerobic conditions while its degradation was greatly inhibited by these anions under aerobic conditions. This study significantly improved our knowledge of PS-mediated degradation processes of DDTs and provided new insight into soil remediation by in-situ chemical oxidation at different oxygen status.The contribution of oxidation debris (OD) to the acidity of graphene oxide (GO) was investigated in this study. With Na2CO3 as the titrator base, the Boehm titration results showed that the total acidity of GO in an aqueous solution decreased from 9.72 to 2.74 mmol g-1 after a thorough removal of OD and that the total acidity of OD was 26.45 mmol g-1. Thermogravimetric analyses showed that the mass ratios of OD and residual graphene sheets (named bwGO) were ∼26 % and ∼73 % of the whole pristine GO, respectively. Based on the quantitative relationships between the mass ratio and acid site density, it was concluded that the total acidity of GO was equal to the sum of the acidity from bwGO and the OD contained in GO. Under alkaline conditions, the splitting and stripping of OD was attributed to the combined effect of the cleavage of H-bonds by nucleophilic attack from OH- and the electrostatic repulsion due to the ionization of carboxylic acids, in which the former became dominant when the pH shifted to neutral and weakly acidic. This study provides an explanation for the origin of GO acidity in aqueous solutions and highlights the role of OD in the chemistry of GO.In present study, copper (Cu), zinc (Zn), tetracycline (TC) and ampicillin (AMP) were selected to study the individual and synergistic effects of antibiotics and heavy metals on the microbial communities and resistance genes on polyvinyl chloride microplastics (PVC MPs) and surrounding sewage after 28 and 84 days. The results indicated that PVC MPs enriched many microorganisms from surrounding sewage, especially pathogenic bacteria such as Mycobacterium and Aquabacterium. The resistance gene with the highest abundance enriched on PVC MPs was tnpA (average abundance of 1.0 × 107 copies/mL sewage). The single presence of Zn, TC and AMP inhibited these enrichments for a short period of time (28 days). But the single presence of Cu and the co-existence of antibiotics and heavy metals inhibited these enrichments for a long period of time (84 days), resulting in relatively low microbial diversities and resistance genes abundances. Transpose tnpA had significantly positive correlations (p less then 0.05) with all other genes.