Nicolajsenjohannsen5296

It is important to obtain bacteria with the ability for reduction of dyes and Cr(Ⅵ) since dyes and Cr(Ⅵ) are often co-exist in textile wastewater. In this study, a new strain belonging to Ochrobactrum anthropi was isolated from textile wastewater, and could efficiently reduce Reactive Black 5 (RB 5) and Cr(Ⅵ). The results showed the degradation efficiency of RB 5 could achieve 100% and reduction efficiency of Cr(Ⅵ) was up to 80% within 3 days at initial RB 5 and Cr(Ⅵ) concentration of 400 mg/L and 20 mg/L. Mn2+ and Cu2+ could enhance the removal of RB 5 and Cr(Ⅵ), respectively. find more Glycerin, as electron donor, improved reduction efficiencies of RB 5 and Cr(Ⅵ). In addition, reduction mechanisms were further investigated. The results demonstrated that decreasing of RB 5 and Cr(Ⅵ) concentration were mainly through extracellular bioreduction rather than by adsorption. The FTIR and XPS analyses revealed that the O‒H, C‒C and C‒H groups on the cell surface might be involved in the reduction of RB 5 and Cr(Ⅵ). The information gives useful insights into understanding of how the bacterium reduce RB 5 and Cr(Ⅵ). The results indicated that the strain had excellent application prospect for treating industrial wastewater.Visible light degradation is a green and economic technology for sewage treatment receiving widespread attention. Here, the filamentous fungus Phomopsis sp. XP-8 was developed as a bioreactor to successively biosynthesize Cd0.5Zn0.5S quantum dots and gold nanoparticles (AuNPs) in situ and formed heterogeneous Au/Cd0.5Zn0.5S nano-photocatalyst inside cells. This strategy synchronously mediates the microscopic and macroscopic assembly of zero-dimensional materials by microorganisms. The heterogeneous catalyst functionalized composite mycelium pellets (CMP) not only have excellent visible light degradation activity but some unique characteristics. The outstanding organic dye biosorption capacity of CMP increases the contact rate between organic dyes and nano-catalysts, improving catalytic activity. High mechanical strength makes CMP easy to separate and recycle, which overcomes the difficulty of nano-catalyst recovery after use and avoids creating secondary pollution to the environment. This study not only broadens the means of heterogeneous nano-catalyst synthesis but also provides a new perspective on the macroscopic assembly of nanomaterials.Rare earth elements (REEs) have attracted widely attentions because of their excellent properties, however, radioactive waste residue generated during the REEs production has created serious environmental problems. This study aimed to develop a safer and cleaner technology, including residue leaching, thorium (Th) separating and REEs recovering, for the proper disposal of radioactive waste residue from ion-absorbed rare earth separation industry to reduce the environmental hazards. First, the chemical composition of residue was analyzed. Then, the leaching factors such as acid type, acid concentration and liquid-solid ratio were investigated and a multi-step leaching process was proposed to improve acid utilization and the leaching of REEs. After the multi-step leaching with HCl, the total leaching efficiency of REEs and Th were higher than 98.14% and 99.07%, respectively. Next, a commercial extractant of sec-octylphenoxy acetic acid (CA-12) was used to separate Th and enrich REEs from the residue leachate. The extraction factors of CA-12 toward Th were investigated in detail and a fractional extraction for separating Th and enriching lanthanides from the leachate of residue was carried out, showing that the separation efficiency of Th was higher than 99.53% and the concentration of lanthanides in the concentrated solution was 223.19 g L-1.Reclaimed water (RW) irrigation provides an effective method to alleviate freshwater resources shortage. However, the residual endocrine disrupting chemicals in RW may cause potential risks to the environment and human body. Pot experiments were conducted to study the occurrence and environmental behavior of nonylphenol (NP) in soil-celery system simulating long-term RW irrigation, and exposure to NP was assessed to identify human health risks. Celery was grown on soil with different initial NP concentrations (0.126-22.9 mg·kg-1) to simulate the different irrigation years. After harvest, the NP concentrations in roots, stems and leaves were 0.26-1.51, 0.21-0.45 and 0.33-0.74 mg·kg-1, respectively. The NP concentrations in soil at depths of 5, 10 and 15 cm were 0.047-1.75, 0.088-1.77 and 0.048-1.07 mg·kg-1, respectively. The results showed a limited NP enrichment capacity of celery and low residual rates of NP in soil-celery system, which were between 6.33% and 26.3%. Both the bioconcentration factors (BCFs) and the residual rates of NP decreased with the initial NP concentrations in soil. The total noncancer hazard quotients (HQs) for human exposure to NP from celery and soil had the order of 10-4-10-3, which was lower than the acceptable risk level of 1 and showed safe conditions under long-term RW irrigation.Accurate detection of cytotoxic food preservative tert-butylhydroquinone (TBHQ) has significant importance in maintaining food quality and safety. TBHQ is a chronic hazard to aquatic life and its use in applications involving direct human exposure and frequent release to environment makes its quantification critical to maintain safety. Hence, we report development of a sensitive electrochemical sensor for TBHQ determination at nanomolar level in commonly used edible oils and water sample. Novel cupric oxide (CuO) decorated amine functionalized carbon nanotubes (NH2-CNTs) were prepared for development of TBHQ sensor. 3D CuO nanoflowers and NH2-CNTs were synthesized using hydrothermal and ultrasound-assisted method respectively. Techniques such as SEM, elemental mapping, XRD, FTIR, micro Raman, XPS, EIS, and UV-Visible spectroscopy were taken to affirm significant characterizations of synthesized materials. We have observed outstanding electrocatalytic activity towards TBHQ detection using the sonochemically prepared nanocomposite modified screen printed carbon electrode (SPCE). The proposed sensor exhibited ultra-low detection limit at 3 nM and exceptional sensitivity at 37.7 μA μM-1 cm-2. Furthermore, TBHQ sensor showcased outstanding anti-interference, stability, reproducibility, and repeatability. The practical feasibility of TBHQ detection was validated using real sample analysis resulting in excellent recovery in the range 95.90-104.87% and a maximum RSD of mere 2.71%.