Optimization of AgIO/BiTiO composite photocatalyst to achieve enhanced photocatalytic performance by adjusting internal electric field via oxygen defect engineering.

The construction of heterojunction is an effective and conventional method to improve the photocatalytic activity of photocatalysts. On this basis, how to further regulate the separation and migration of photogenerated carrier is worthy of further investigation. As a mature and efficient modification method, oxygen defect engineering was used to regulate the S-scheme heterojunction composed of AgIO and BiTiO to further enhance the photocatalytic activity of the constructed heterojunction in this study.

Construction of novel Ag/AgI/BiTiO plasmonic heterojunction: A study focusing on the performance and mechanism of photocatalytic removal of tetracycline.

As a result of the insufficient absorption of visible light, the application of BiTiO in the field of photocatalysis is limited. Ag/AgI was uniformly modified on the surface of the nanoflower bulb of BiTiO by simple precipitation method and photodeposition. The fabricated Ag/AgI/BiTiO obtained an ultra-high tetracycline (TC) removal rate under visible light irradiation.

Mussel-inspired self-healing hydrogel based on gelatin and oxidized tannic acid for pH-responsive controlled drug release.

A series of mussel-inspired pH-responsive self-healing hydrogels based on gelatin crosslinked by oxidized tannic acid (GLT-OTAs) were prepared and used as controlled drug delivery systems (CDDS). An antiphlogistic drug, indomethacin (IDMC) was used as model drug to be immobilized into the hydrogels. The obtained hydrogel samples were characterized by Fourier transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD) and scanning electron microscopy (SEM).

Novel La/Sm co-doped BiOI with efficient visible-light photocatalytic activity for advanced treatment of wastewater: Internal mechanism, TC degradation pathway, and toxicity analysis.

Controlling semiconductor photocatalysts by doping rare-earth ions is an effective strategy to improve photocatalytic performance. Simple solvothermal and calcination methods were used to prepare La and Sm modified BiOI nanomaterials. Some characterizations such as XRD, XPS, SEM, TEM, UV-vis, etc.

Er/Sm co-doped BiOCO in photocatalytic water treatment: Immobilization, acute toxicity, sterilization, and catalytic oxidation activity.

Defect construction and rare earth doping are the linchpins to completing the target of partial electronic regulation. In Er/Sm co-doping BiOCO, rare earth doping resulted in the exposure of {001} crystal plane in BiOCO and cause surface defects and electron traps, achieving wide light response capability and fast carrier separation. Furthermore, a potential TC degradation route was acknowledged derived from LC-MS.

Construction of Z-scheme Ag-AgBr/BiOCO/CNT heterojunctions with remarkable photocatalytic performance using carbon nanotubes as efficient electronic mediators.

It is a useful strategy to use a solid electronic mediator with good conductivity to assist the separation of semiconductor photo-induced electron-hole pairs and the redox of semiconductor materials. In order to construct a photocatalyst for more efficient photocatalytic degradation of antibiotics, a simple hydrothermal and precipitation method was used to construct the Ag-AgBr/BiOCO/CNT Z-scheme heterojunction by using carbon nanotubes (CNTs) as electronic mediators. Compared with the pristine AgBr, BiOCO, BiOCO/CNT, the 30%Ag-AgBr/BiOCO/CNT photocatalyst has better photocatalytic activity under visible light irradiation, showing the best degradation ability to tetracycline (TC).

Facile construction for new core-shell Z-scheme photocatalyst GO/AgI/BiO with enhanced visible-light photocatalytic activity.

Heterojunction formation and morphology control have always been regarded as effective ways to improve the performance of visible-light-driven photocatalysts. In this study, a new facile strategy was applied to synthesize the Z-scheme GO/AgI/BiO heterojunction, where polyvinyl pyrrolidone (PVP) and γ-methacryloxypropyl trimethoxy silane (KH-570) were used to modulate the morphologies. Methyl orange and tetracycline hydrochloride were chosen as target contaminants to evaluate the photocatalytic properties of samples and the results revealed that 2% GO/AgI/BiO exhibited the best photocatalytic performance under visible-light irradiation.

Emission characteristics and potential toxicity of polycyclic aromatic hydrocarbons in particulate matter from the prebaked anode industry.

The emission factors (EFs) and source profiles of polycyclic aromatic hydrocarbons (PAHs) in particulate matter (PM and PM) from the prebaked anode industry were studied to fill the knowledge gap and provide data for emission inventory and source resolution. In 2018, three prebaked anode plants were selected in Central China, each having one calcining chimney as well as one baking chimney, and then 92 samples were collected from the stack gas of the six chimneys. The results of the study are as follows.

[Characteristics and Source Analysis of Water-Soluble Ions in PM in Zhengzhou].

In order to explore the pollution characteristics of water-soluble ions in PM in Zhengzhou, high time resolution and continuous observation of water-soluble inorganic ions in PM was conducted from December 1, 2017, to November 30, 2018, in Zhengzhou. The results showed that during the observation period, the average concentration of total water-soluble ions in Zhengzhou was 42.7 μg·m.

[Health Benefit Evaluation for PM and PM Pollution Control in Zhengzhou, China, 2014-2016].

Based on the annual average concentration values, the health effects and health benefits as well as 95% confidence intervals of PM and PM pollution control from 2014 to 2016 in Zhengzhou were evaluated by applying the Poisson regression relative risk model. Results showed that the health benefits of PM pollution control were 18.18 billion RMB (15.

[Emission Characteristics Analysis and Health Risk Assessment of Unorganized VOCs in the Carbon Industry, Zhengzhou].

The three typical carbon enterprises in Zhengzhou were selected as research targets, and the emission characteristics of volatile organic compounds (VOCs) and their ozone formation potential (OFP) in different functional areas were studied. The US Environmental Protection Agency (EPA) health risk assessment model was used to evaluate the health risks of VOCs emitted by the carbon industry. The results showed that the concentration of VOCs in the production areas of the three research enterprises was between 89.

[Heavy Metal Pollution Characteristics and Ecological and Health Risk Assessment of Atmospheric PM in a Living Area of Zhengzhou City].

To study the pollution characteristics of atmospheric heavy metal elements in a living area of Zhengzhou City, assess the potential ecological risks, and determine risks to resident health in this city, the Wuhan Tianhong TH-16A Airborne Particles Intelligent Sampler was used to collect atmospheric PM in Zhengzhou City. The mass concentrations of 17 metal elements were analyzed by ambient air determination of inorganic elements by ambient particle matter wavelength dispersive X-ray fluorescence spectrometry. The source of heavy metals was analyzed by the enrichment factor method and principal component analysis.

[Emission Characteristics and List of Inorganic Elements in Fine Particles of Typical Industrial Kilns in Zhengzhou City].

Samples of particulate matter from flue gas emissions of typical brick, cement, and firebrick industrial kilns in Zhengzhou City were collected by dilution channel systems. Cr, Mn, Fe, Co, Na, Mg, Al, Si, P, S, Cl, K, Ca, Ti, V, Ni, Cu, Zn, Ga, As, Se, Sr, Cd, Sb, Sn, Ba, and Pb were analyzed. The emission factors (EFs) and emissions of inorganic elements of PM from kilns flue gases of three industries in Zhengzhou City during 2016 were calculated.

Constructing a new Z-scheme multi-heterojunction photocataslyts Ag-AgI/BiOI-BiO with enhanced photocatalytic activity.

The series Ag-AgI/BiOI-BiO visible-light-driven photocataslyts were successfully synthesized by solvothermal method. The as-synthesized samples were systematically characterized by XRD, SEM, TEM, EDS, BET, XPS, FR-IR, UV-vis DRS, photoelectrochemical measurements and EPR. The formation mechanism of the new composite photocataslyts was investigated and the simulate formation process had been illustrated.

Size-fractionated particulate elements in an inland city of China: Deposition flux in human respiratory, health risks, source apportionment, and dry deposition.

Size-resolved samples were collected using a 14-stage impactor during four seasons in Zhengzhou and analyzed for 26 elements to calculate the health risks from atmospheric particle-bound metals. High concentrations of heavy metals were observed in ultrafine (10.2 (Ni)-66.

Insight into the formation of secondary inorganic aerosol based on high-time-resolution data during haze episodes and snowfall periods in Zhengzhou, China.

Episodic haze is frequently observed in Zhengzhou, China. Such haze typically contains secondary inorganic aerosols. In this paper, we explore the formation mechanisms of sulfate, nitrate, and ammonium (SNA) in Zhengzhou from January 3 to 25, 2018 based on the results of a series of online instruments and a size-segregated filter sampler.

[Size Distribution Characteristics of Water-Soluble Inorganic Ions During Summer and Autumn in Zhengzhou].

To study the compositional characteristics of atmospheric particulates with different particle sizes in the central city of Zhengzhou, China, a Tisch graded impact sampler was used to sample atmospheric particulates in summer and autumn. The mass concentrations of water-soluble inorganic ions, including anions (Cl, F, NO, and SO) and cations (Na, Ca, NH, K, and Mg) were measured by ion chromatography, and the online ion chromatography-based analyzer MARGA monitored the real-time concentration of particulate nitrate. The results showed that the average concentration of water-soluble ions in Zhengzhou City was (70.

A research on shape-controllable synthesis of AgPO/AgBr and its degradation of ciprofloxacin.

Antibiotic ciprofloxacin is one of the commonly used broad spectrum fluoroquinolone human and veterinary drugs. Because of the overuse of human beings, the presence of ciprofloxacin has been detected in a variety of environmental matrices. To solve this problem, a facile, environmentally-friendly AgPO/AgBr composite photocatalyst was synthesized by a simple precipitation method at room temperature in the presence of cetyltrimethyl ammonium bromide (CTAB).

Efficient photocatalytic degradation of tetracycline hydrochloride by Ag3PO4 under visible-light irradiation.

A facile, environmental-friendly Ag3PO4-PN photocatalyst was synthesized by a simple precipitation method at room temperature in the presence of ammonia and polyvinyl pyrrolidone (PVP). As-synthesized samples were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and UV-visible diffuse reflectance spectroscopy (UV-vis DRS). The enhancement of photocatalytic efficiency of Ag3PO4-PN is strongly dependent on the excellent photo-absorption capacity, sharp edges and corners, and synergistic effect of PVP and NH3·H2O.

Efficient visible-light photocatalytic degradation of sulfadiazine sodium with hierarchical Bi₇O₉I₃under solar irradiation.

Bi₇O₉I₃, a kind of visible-light-responsive photocatalyst, with hierarchical micro/nano-architecture was successfully synthesized by oil-bath heating method, with ethylene glycol as solvent, and applied to degrade sulfonamide antibiotics. The as-prepared product was characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV-visible diffuse reflection spectra and scanning electron microscopy (SEM). XRD and XPS tests confirmed that the product was indeed Bi₇O₉I₃.

Sorption of chloramphenicol on pond sediments and the effect of coexistence Cu(II).

The sorption of chloramphenicol on four types of sediment and the effect of coexistence Cu(II) on the sorption were studied. Sorption isotherms and thermodynamic analysis were employed to dispose the experimental sorption data. Experimental results showed that organic matter was the dominant parameter and the coexistence of heavy metal Cu(II) could promote the sorption of chloramphenicol on four tested sediments.

Influence of pyrene combination state in soils on its treatment efficiency by Fenton oxidation.

Interactions of hydrophobic organic compounds (HOCs) with soil organic matter (SOM) determine their combination state in soils, and therefore strongly influence their mobility, bioavailability, and chemical reactivity. Contact time (aging) of an HOC in soil also strongly influences its combination state and environmental fate. We studied Fenton oxidation of pyrene in three different soils to reveal the influences of SOM, contact time, and combination state on the efficiency of vigorous chemical reactions.

Influence of Fenton oxidation on soil organic matter and its sorption and desorption of pyrene.

The influences of Fenton oxidation on the content and composition of soil organic matter (SOM) and the consequent change of its sorption and desorption of pyrene were investigated using three soil samples. The results showed that both the content and the composition of the SOM changed, with total SOM content decreasing. The content of humic acid (HA) was reduced, while the content of humin did not change significantly, however the content of fulvic acid (FA) had a tendency to increase.