Jessore University of Science & Technology

About: Jessore University of Science & Technology is a based out in . It is known for research contribution in the topics: Adsorption & Population. The organization has 811 authors who have published 974 publications receiving 10471 citations.

Solar-TiO2 immobilized photocatalytic reactors performance assessment in the degradation of methyl orange dye in aqueous solution

Abstract: Heterogeneous photocatalysis with titanium dioxide (TiO2) nanoparticles (NPs) has been demonstrated an emerging semiconductor material and widely been used in the treatment of wastewater due to is its high photocatalytic activity. In this study, TiO2 NPs with and without hydrolysis were synthesized by sol–gel and heat treatment methods. About 67 times higher surface area was obtained for TiO2 NPs synthesized with hydrolysis as compared to without hydrolysis. The X-ray diffraction showed an increased amount of anatase phase of TiO2 NPs with hydrolysis whereas the rutile phase of TiO2 NPs was obtained without hydrolysis. Immobilized-TiO2 NPs borosilicate glass (BG), cement coated borosilicate glass (CCBG), and steel wire mesh (SWM) reactors were constructed and the photocatalytic performance of TiO2 NPs was investigated to the degradation of methyl orange (MO) dye under solar irradiation. The photocatalytic removal of 10 mg/L MO dye was 97.8%, 88.6%, and 21.5%, respectively, at the same dose of immobilized-TiO2 on BG, CCBG, and SWM surfaces at pH 6.2 with 5 h of contact time. The kinetic study showed a pseudo-first-order reaction model fitted the best for MO dye removal. The increase of dye concentration decreases the performance of BG reactor, whereas, the addition of oxidant H2O2 increases the performance of BG reactor. The lowest TiO2 NPs loss from the study was observed for BG reactor (10.78%). This study indicates that the solar-TiO2 immobilized borosilicate glass reactor has high potential in the treatment of toxic compounds in textile wastewater.

Utilization of cow dung residues of biogas plant for sustainable development of a rural community

Abstract: Ziala Village of Satkhira District in Bangladesh is well known for cow dung management and biogas production. Biogas plants produce huge quantities of organic residues and biogas. Cow dung is widely used in the plant as a part of waste management and biogas production. The residues are used as organic fertilizer and biogas is used as fuel in the Ziala Village. Therefore, the study was conducted to observe the effectiveness of using cow dung residues produced in biogas plants and its subsequent impacts on socio-economic profile. The study was based on face to face interview of randomly selected dairy farmers in 2014. Twelve representative samples of biogas plants were randomly selected for interviewing. Findings suggested that renewable energy transfer system in the form of biogas plant was successful in converting cow dung into energy and nutrient rich organic fertilizer, which reduced the cost of purchasing chemical fertilizer for plant owners. Renewable energy transfer plants noticeably improved the overall cooking environment of the biogas digesters and reduced the time needed to collect firewood. This facilitates livestock management and preservation of forest resources. Biogas plants eventually contributed to elevate environmental condition and resource recovery which ultimately improved socio-economic profiles in terms of occupational distribution and educational attainment of the participating households. However, agricultural wastes and cow dung were not optimally managed by some households in surveyed area. This causes environmental degradation in terms of water and air pollution in the study area.

Biosorbents for Removing Hazardous Metals and Metalloids.

Abstract: Biosorbents for remediating aquatic environmental media polluted with hazardous heavy metals and metalloids such as Pb(II), Cr(VI), Sb(III and V), and As(III and V) were prepared from lignin waste, orange and apple juice residues, seaweed and persimmon and grape wastes using simple and cheap methods. A lignophenol gel such as lignocatechol gel was prepared by immobilizing the catechol functional groups onto lignin from sawdust, while lignosulfonate gel was prepared directly from waste liquor generated during pulp production. These gels effectively removed Pb(II). Orange and apple juice residues, which are rich in pectic acid, were easily converted using alkali (e.g., calcium hydroxide) into biosorbents that effectively removed Pb(II). These materials also effectively removed Sb(III and V) and As(III and V) when these were preloaded with multi-valent metal ions such as Zr(IV) and Fe(III). Similar biosorbents were prepared from seaweed waste, which is rich in alginic acid. Other biosorbents, which effectively removed Cr(VI), were prepared by simply treating persimmon and grape wastes with concentrated sulfuric acid.

Removal of Methyl Orange Dye from Aqueous Solution by a Low-Cost Activated Carbon Prepared from Mahagoni (Swietenia mahagoni) Bark

Abstract: This study utilized Swietenia mahagoni bark–a wood processing industry waste, for the preparation of activated carbon, and then investigated for the removal of methyl orange (MO) dye by the Swietenia mahagoni bark activated carbon (SMBAC). The effect of pH (3–10), adsorbent dose (1–30 g/L), initial MO dye concentration (10–100 mg/L), and contact time (1–240 min) were evaluated. The surface morphology of the SMBAC was characterized by using fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). Maximum removal efficiency of MO by SMBAC was 92%, when initial MO dye concentration was 10 mg/L, pH 3.0, adsorbent dose 10.0 g/L and 120 min equilibrium contact time. The adsorption data fitted well with the Freundlich (R2=0.997) and Halsey (R2=0.997) isotherm models than the Langmuir (R2=0.979) model, and express the multilayer adsorption on heterogeneous surface. The maximum adsorption capacity was 6.071 mg/g. The kinetics data were fitted well to pseudo-second order model (R2=0.999) and more than one process were involved during adsorption mechanism but film diffusion was the potential rate controlling step. The study results showed that SMBAC adsorbed MO effectively, and could be used as a low cost potential bioadsorbent for the removal of anionic dyes in wastewater treatment.