32 research outputs found
Effects of metal stress on biochemical response of some aquatic macrophytes growing along an industrial waste discharge channel
No full textAdvances in Nanomaterial‐based Water Treatment Approaches for Photocatalytic Degradation of Water Pollutants
No full textAssessment of Arsenic Toxicity and Tolerance Characteristics of Bean Plants (<i>Phaseolus Vulgaris</i>) Exposed to Different Species of Arsenic
No full textMorphology Controlled Fabrication of Highly Permeable Carbon Coated Rod-Shaped Magnesium Oxide as a Sustainable Arsenite Adsorbent
No full textArsenic
poisoning from drinking water has been causing distress
to millions of people worldwide due to its toxicity and carcinogenicity.
Regardless of numerous long stretches of research, manageable arsenic
treatment innovations which are cost-effective in implementation seem
to be sporadic. Herein, we demonstrate the facile synthesis of financially
savvy rod-shaped carbon coated magnesium oxide (C-MgO) and its characteristic
capacity toward arsenite adsorption. With a specific surface area
of 117.6 m2/g and a controlled mesoporous shell, this material
is a better adsorbent than its synthetic counterpart, N-MgO, integrated
without a dextrose intervened calcination procedure of precursor.
Results show that C-MgO has an adsorption capacity of 142 mg/g at
pH 7 after 4 h with an initial As(III) concentration of 80 mg/L. In
situ formed easily accessible hydroxyl groups on the surface and porous
channels articulate its multilayer chemisorption ability which is
empirically well-fitted to the Freundlich isotherm model with an R2 value of 0.996, while the adsorption kinetics
data follows pseudo-second-order kinetics (R2 = 0.999). In addition, C-MgO has efficient reusability with
almost 67% removal efficiency after four cycles. As far as real-time
applicability is concerned, 90% of As(III) was adsorbed within 20
min for groundwater As(III) concentrations up to 165 ppb. These qualities
give noteworthy innovative perceptions to the utilization of tailored
MgO nanoparticles in groundwater purification
Preparation and characterization of macroporous SiC ceramic membrane for treatment of waste water
No full textPorous SiC based materials present high mechanical, chemical and thermal robustness and thus have been largely applied to water-filtration technologies. In this study, circular disc shaped SiC microfiltration membranes were prepared by dry pressing of commercially available SiC powder with yttria and alumina as additives followed by a low-cost oxide bonding technique. The membranes fabricated were characterized using standard characterization techniques like Scanning Electron Microscopy (SEM), Powder X-ray Diffraction (PXRD), porosity and pore size distribution analysis and compared with the membrane prepared by liquid phase sintering route from the same powder composition. Finally, water permeation studies were carried out in a standard membrane module and clean water flux was determined. These membranes were found well suited for treatment of oily waste water and grey water. The membrane prepared by oxide bonding method effectively removed similar to 89-93% of COD, similar to 77-86% of oil/grease and 88.4-92% of TSS from kitchen waste water and the removal efficiency are better compared to the membrane prepared by liquid phase sintering method. The effects of corrosions on the membranes were investigated in strong acid and alkali solution at 90 A degrees C. The membranes prepared by oxide bonding method showed better corrosion resistance with retention of mechanical strength
Asthenopia (eyestrain) in working children of gem-polishing industries
No full text Working children of gem-polishing units are exposed to poor illumination and improper workstations. Also processes require lot of visual and mental concentration for precision. This may result in eyestrain. The study included 432 exposed and 569 comparison group subjects. Self-reported eyestrain was recorded through personal interview. Eyestrain included symptoms like itching, burning, or irritated eyes; tired or heavy eyes; difficulty seeing clearly (including blurred or double vision); and headache. The study variables included age, gender, daily working hours, and duration of exposure. The prevalence of eyestrain in child labourers was 32.2%, which was significantly more than the comparison group subjects. Also, the working children of gem-polishing units were at 1.4 times higher risk of developing eyestrain. Age 314 years and female gender were significantly associated with the eyestrain. The prevalence of eyestrain in child labourers was 32.2% and was associated with age 314 years and female gender. </jats:p
Environmentally Sustainable Fabrication of Cu<sub>1.94</sub>S-rGO Composite for Dual Environmental Application: Visible-Light-Active Photocatalyst and Room-Temperature Phenol Sensor
No full textPreparation and characterization of macroporous SiC ceramic membrane for treatment of waste water
No full text
