Abdul Mottalib

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• Doctor of Philosophy
• Professor at University of Dhaka

Chromium contamination from tannery wastewater poses a significant threat to both the environment and public health, making its removal from effluents crucial before discharge into surface water. This study explores the effectiveness of activated bio-adsorbents made from cost-effective and sustainable sawmill waste Ficus benghalensis (banyan) bark...

Food packaging industries generally use petroleum-based packaging materials that are non-biodegradable and harmful to the environment. Eco-friendly polymers such as chitosan (CH), gelatin (GE), and cellulose nanocrystals (CNCs) are leading viable alternatives to plastics traditionally used in packaging because of their higher functionality and biod...

Environmental pollution caused by wastes generated from chrome tan is a major concern nowadays. This study aimed to develop an eco-friendly alternative tanning agent using graphene oxide (GO) based nanocomposite materials. GO was synthesized by a new approach with modification of the Hummers method. Two types of GO-based nanocomposites, GO-TiO2 (GT...

Environmental pollution caused by wastes generated from chrome tan is a major concern nowadays. This study aimed to develop an eco-friendly alternative tanning agent using graphene oxide (GO) based nanocomposite materials. GO was synthesized by a new approach with modification of the Hummers method. Two types of GO-based nanocomposites, GO-TiO2 (GT...

Releasing of large volumes of leather scraps wastes from different leather, footwear, and leather goods industries has become a major environmental pollution concern now a days in developing countries. Natural nanofibers are widely used as prospective reinforcement materials in formulation of different biocomposites materials. Herein, a new nanocom...

In the leather industry, 8–12% of chromium compound is used in tanning and around 60–70% of the applied chromium is consumed by the leather fibre and the rest of them are discharged to the effluent. This chromium has an adverse impact on the environment as well as on humans. Chromium (III) can be oxidized into chromium (VI) in many ways which are c...

Nowadays pyrolysis technology for solid waste management has drawn attention for energy recovery due to its both economic and environmental benefits. This study gave importance to co-pyrolysis of leather solid waste and plastic materials to produce pyrolytic products like liquid fuel, char, and gas. The experiment was done in a laboratory scale in...

Large amounts of solid wastes are produced in manufacturing of leather and leather products. Nearly 80–85% of solid wastes is generated in leather production whereas 20–30% of leather is ended up as wastes from leather goods and footwear industries which poses significant concern regarding environmental pollution. An attempt was made to produce env...

Recovering and reusing chrome from chrome effluent is critical for improving the mass balance of the tanning process and implementing the zero liquid discharge concept in the tanning industry. Conventional chrome recovery methods require a large amount of chemicals or energy to recycle the chromium. Chrome recovery by solar evaporation has not been...

Chrome tanning is the most popular and widely used method utilizing basic chromium salts in leather processing. Only 60-70% of these salts react with collagen to form leather. The rest remains unreacted being released as toxic waste and causing severe environmental pollution in many developing countries. In the current study, a significant approach...

Continuous discharge of untreated wastewater with high chromium contents from tanning industries causes severe environmental pollution in different aquatic systems as well as poses a variety of health risks. To reduce harmful chromium pollution in various water bodies, it is imperative to develop a method that is both affordable and environmentally...

Extensive use of water in different industries particularly leather tanning has drawn attention in recent years. In this research, a new approach has been developed to reduce water consumption in the tanning industry. Four different experiments were carried out on raw goat skins by using various quantities of water which were much lower than the in...

Extensive use of water in different industries particularly leather tanning has drawn attention in recent years. In this research, a new approach has been developed to reduce water consumption in the tanning industry. Four different experiments were carried out on raw goat skins by using various quantities of water which were much lower than the in...

Extensive use of water in different industries particularly leather tanning has drawn attention in recent years. In this research, a new approach has been developed to reduce water consumption in the tanning industry. Four different experiments were carried out on raw goat skins by using various quantities of water which were much lower than the in...

Environmental pollution is a major concern for leather industry. During leather processing, a large amount of waste is generated and their disposal into water bodies without proper treatment has a detrimental effects on environment. Tannery effluent is composed of several kinds of liquid waste: soak, lime, delime & bate, pickle & chrome. Deliming i...

p>Cultivated fishes are major protein and microelement sources for all sorts of people in Bangladesh due to its availability and affordability. Since heavy metals are persistent in the aquatic environment, these metals can accumulate in the food chain. Cultivated fishes containing heavy metals can cause a carcinogenic and non-carcinogenic risk to h...

Environmental pollution is a major concern for leather industry. During leather processing, a large amount of waste is generated and their disposal into water bodies without proper treatment has a detrimental effects on environment. Tannery effluent is composed of several kinds of liquid waste: soak, lime, delime & bate, pickle & chrome. Deliming i...

Abstract The study was conducted to determine the water quality of Mokeshbeel, near Gazipur industrial area of Bangladesh. To perform the study six water samples were collected from six different points in the beel and analyzed for various physicochemical parameters such as pH, Temperature, Total Dissolved Solids (TDS), Total Suspended Solids (TSS)...

The contaminations of toxic heavy metals such as, Cr, Mn, Fe, Ni, Cu, Zn, As, Cd, Hg and Pb in irrigation water, soil and highly consumed seven vegetables and crops at Mokesh Beel, Gazipur in Bangladesh, were determined by inductively coupled plasma-mass spectroscopy (ICP-MS). Most of the metal's concentrations exceeded the maximum permissible limi...

Concentrations of Cu, Zn, Fe, Mn, Ni and Cr have been estimated in sediments of the Shitalakhya River at Polash-Ghorashal area, Narsingdi, Bangladesh. 36 samples of sediments from nine sampling point at different locations of Shitalakhya River were collected to determine the concentration of Cu, Zn, Fe, Mn, Ni, Cr and the samples were analyzed by a...

The paper reports the findings on the concentrations of heavy metals in ten different fish feed by using Atomic Absorption Spectrometer. The level of heavy metal concentrations (dry weight) in the fish feed ranged from 1.17 to 2.0, 2.33 to 4.67, 5.17 to 21.67, 106.67 to 363.3, 3.5 to 7.16, 3.83 to 21.2, 56.7 to 141.6 and 2.1 to 16.49 mg/kg of Cd, C...

Background. Bangladesh is a densely populated country with a high demand for non-vegetable protein. Poultry meat is an important source of protein due to its affordability. Trace metals are persistent in the environment and are subject to bioaccumulation in the food chain. Contaminated poultry feed can pose a risk to human health as it biomagnifies...

Basic chromium sulfate is the most widely used chemical for tanning processes, but 60-70% of total chromium salt reacts with the hides. Rest of the amount about 30-40% of the chromium remains in the liquid wastes. Therefore, the recovery and reuse of the chromium content of these wastewaters are necessary for environmental protection and economic r...

A study was conducted on physico selected area of Buriganga and Balu such as pH, electric conductivity (EC), biochemical oxygen demand (BOD), chemical oxygen demand (COD) and six heavy metals like Fe, Zn, Cd, Cr, Hg and Pb were investigated to assess water qualit of these rivers on April 7.64, 1096 mg/L, and 204.8 metals in water samples were deter...

Abstract: The physico-chemical properties of soils of Hazaribagh (Dhaka) Tanning industrial area were studied. The aim of this study was to investigate the pH, electrical conductivity and the concentrations of some soluble salts of soils near existing buildings and also soils inside of tanneries as the tanneries are relocating from this area and wh...

p>The study was carried out to examine the Pb concentrations of water, sediment and soil of Shitalakhya River at Polash and Ghorashal areas in Bangladesh. The ranges of Pb in water, sediments, soils and vegetables like pumpkin leaves and alligator weeds were found 1.87 - 49.08, 8.49 - 75.81, 19.68 - 85.13, 1.08 - 3.92 and 1.18 - 4.22 mg/kg, respect...

A large amount of leather solid waste is generated daily from tanning industries. In recent years shaving dust – a major solid waste of tanning process, is being used in poultry feed production as a protein source because of its costless availability. However, leather is treated with many chemicals during its tanning process. Thus it may be one of...

A large amount of leather solid waste is generated daily from tanning industries. In recent years shaving dust – a major solid waste of tanning process, is being used in poultry feed production as a protein source because of its costless availability. However, leather is treated with many chemicals during its tanning process. Thus it may be one of...

A large amount of leather solid waste is generated daily from tanning industries. In recent years shaving dust – a major solid waste of tanning process, is being used in poultry feed production as a protein source because of its costless availability. However, leather is treated with many chemicals during its tanning process. Thus it may be one of...

The present investigation was conducted to determine levels of heavy metal pollution in tannery area of Dhaka city. Concentration of Fe, Cr, Cu, Cd, Pb, Ni and As have been estimated in soil and vegetables grown around the leather industrial area. The investigated soil and vegetables samples were collected in open place of different distances from...

Tanning industries produces large quantities of waste water which on direct discharge causes severe environmental pollution. Basic chromium sulphate used in the tanning process is not consumed fully and about 30 problem especially to the aquatic system. Here a simple method is developed to remove the chromium content of the tannery waste water. Was...

Reaction of the tricobalt carbyne cluster [Co3(μ3-CH)(CO)9] with chiral diphosphines of the Josiphos and Walphos families affords the new clusters [Co3(μ3-CH)(CO)7(P-P∗)] in good yield (P-P∗ = J004 (1), J005 (2), J007 (3), W001 (4), W003 (5)). The new alkylidyne tricobalt clusters, and the previously known [Co3(μ3-CH)(CO)7(μ-J003)], have been teste...

Tannery effluents are one of the major sources of environmental pollution with various toxic parameters and the effluent generated during liming and pickling operations of leather processing are even more dangerous due to their high and low pH range, respectively. In the present work, liming and pickling streams generated during the production of c...

Metal contamination in arable soils and crops grown in and around an industrial area of Bangladesh were measured, and the transfer factor from soils to crops was calculated accordingly. The highest concentration was observed for Fe and the order of metal concentration was Fe > Zn > Cr > Pb > Cu > Ni > Cd in soils. Bioaccumulation and translocation...

Reaction of [Re2(CO)9(NCMe)] with tri(2-thienyl)phosphine (PTh3) in refluxing cyclohexane affords three substituted dirhenium complexes: [Re2(CO)9(PTh3)] (1), [Re2(CO)8(NCMe)(PTh3)] (2), and [Re2(CO)8(PTh3)2] (3). Complex 2 was also obtained from the room-temperature reaction of [Re2(CO)8(NCMe)2] with PTh3 and is an unusual example in which the ace...

Phosphine derivatives of alkylidyne tricobalt carbonyl clusters have been tested as catalysts/catalyst precursors in intermolecular and (asymmetric) intramolecular Pauson-Khand reactions. A number of new phosphine derivatives of the tricobalt alkylidyne clusters [Co3(micro3-CR)(CO)9] (R = H, CO2Et) were prepared and characterised. The clusters [Co3...

Tris(2-thienyl)phosphine, P(C4H3S)3, reacts with [Os3(CO)12] at 110°C to give the phosphine-substituted derivatives [Os3(CO)11{P(C4H3S)3}] (1), [Os3(CO)10{P(C4H3S)3}2] (2) and [Os3(CO)9{P(C4H3S)3}3] (4), as well as the C–H activated product [Os3(μ-H)(CO)9{μ-P(C4H2S)(C4H3S)2}{P(C4H3S)3}] (3), in which the bridging ligand is equatorially coordinated...

Thermal treatment of [Os3(CO)12] with diphenyl(2-thienyl)phosphane, Ph2P(C4H3S), results in the formation of [Os3(CO)12–x{Ph2P(C4H3S)}x] (x = 1–3, 1–3), but no C–H bond activation was observed. Reaction of [H2Os3(CO)10] with diphenyl(2-thienyl)phosphane at ambient temperature affords [HOs3(μ-H)(CO)10{Ph2P(C4H3S)}] (4), but when the samereaction is...

Treatment of [(μ-H)Os3(CO)10(μ-OMe)] (1) with dppm {dppm = bis(diphenylphosphino)methane} at 110 °C gave the known compound [Os3(CO)10(μ2-η2-dppm)] (2) and the new compound [(μ-H)Os3(CO)8(μ-OMe)(μ2-η2-dppm)] (3). A similar reaction of 1 with dppe {dppe = bis(diphenylphosphino)ethane} afforded two products, [(μ-H)Os3(CO)8(μ-OMe)(μ1-η2-dppe)] (5) and...

The electronically unsaturated quinoline triosmium clusters (μ-H)Os3(CO)9(μ3-η2-C9H5(R)N) (6, R = 4-CH3; 7, R = H) react with excess CH2N2 at 0−25 °C to give (μ-H)2Os3(CO)9(μ3-η2-CHC9H5(R)N) (10, R = 4-CH3; 11, R = H), formed by insertion and subsequent C−H oxidative addition of a CH2 moiety into the ring C(8)−Os bond, while the related 46-electron...

The reaction of di(alkyn-1-yl)silanes Me(R)Si(CCtBu)2 [1; R = Me (a), H (b)] with diethylborane or 9-borabicyclo[3.3.1]nonane in a 1 : 1 ratio affords the 1-silacyclobutene derivatives 6a, 7a,b as a result of intermolecular 1,1-hydroboration followed by intramolecular 1,1-organoboration. Intermediates, in which both an alkenyl and an alkynyl group...

Treatment of the unsaturated cluster [(μ-H)Os3(CO)8{Ph2PCH2P(Ph)C6H4}] (1) with HS(CH2)nSH (n=1, 1,2-ethanedithiol; n=2, 1,3-propanedithiol) lead to the novel compounds [(μ-H)Os3(CO)8{μ-S(CH2)nS}{Ph2PCH2P(Ph)C6H4}] (9, n=2, 49%; 12, n=3, 56%) and [Os3(CO)8{μ-S(CH2)nS} (μ-Ph2PCH2PPh2)] (10, n=2, 20%; 13, n=3, 22%). The 52-electron compounds 9 and 12...

Treatment of the unsaturated cluster [(μ-H)Os3(CO)8{Ph2PCH2P(Ph)C6H4}] (1) with HS(CH2)nSH (n=1, 1,2-ethanedithiol; n=2, 1,3-propanedithiol) lead to the novel compounds [(μ-H)Os3(CO)8{μ-S(CH2)nS}{Ph2PCH2P(Ph)C6H4}] (9, n=2, 49%; 12, n=3, 56%) and [Os3(CO)8{μ-S(CH2)nS} (μ-Ph2PCH2PPh2)] (10, n=2, 20%; 13, n=3, 22%). The 52-electron compounds 9 and 12...

An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and...

The reaction of [(μ-H)Os3(CO)8{Ph2PCH2P(Ph)C6H4}] (3) with pyridine-2-thiol (pySH, C5H4NSH) at room temperature gave two novel clusters [(μ-H)Os3(CO)8(μ-pyS)(μ-dppm)] (4) and [H(μ-H)Os3(CO)8(η2-pyS){Ph2PCH2P(Ph)C6H4}] (5) in 55 and 15% yields, respectively. Compound 4 is formed by simple oxidative addition of pySH and demetallation of the phenyl ri...

The unsaturated cluster Os3(CO)8(Ph2PCH2P(Ph)C6H4)(μ-H) (1) reacts with CH2N2 at −10 to 25 °C to give two novel compounds Os3(CO)7(μ3-CN2)(μ-dppm)(μ-H)2 (2) and Os3(CO)7(μ3-CCO2H)(μ-dppm)(μ-H)3 (3) characterized by single-crystal X-ray crystallography. Compound 2 is converted to 3 in almost quantitative yield by reaction with CO (atmospheric pressu...

The 1-alkynyl(chloro)dimethylsilane tBuCCSiMe2Cl (1) reacts with tetraethyl-diborane(6) or 9-borabicyclo[3.3.1]nonane dimer, (9-BBN)2, to give the (Z)-1-chloro-dimethylsilyl-1-diethylboryl-alkenes 2 and 3. These alkenes react with 2-lithio-1-methylimidazole or 1-lithio-indazole by formation of LiCl and of 4, 5 and 9 together with small amounts of...

A comparison between the reactivity of [Ru3(CO)12] and [Os3(CO)10(MeCN)2] with 1,2-ethanedithiol (HSCH2CH2SH) and 1,3-propanedithiol (HSCH2CH2CH2SH) is reported. The reaction of [Ru3(CO)12] with 1,2-ethanedithiol at 68°C afforded [Ru2(CO)6(μ-SCH2CH2S)] (1) in 40% yield, whereas the reaction with 1,3-propanedithiol yielded [{(μ-H)Ru3(CO)10}2(μ-SCH2C...

The reaction of [Os3(CO)10(MeCN)2] with 2-methyl-2-thiazoline at ambient temperature results in the C–H activation of the methyl substituent of the heterocyclic ligand and this gives the new compound [(μ-H)Os3(CO)10(μ-η2-CH2] (8) in 55% yield. Compound 8 undergoes decarbonylation and a further C–H bond activation by thermolysis at 98°C or by treatm...

The 1-alkynyl(chloro)dimethylsilanes R1CC(Cl)SiMe2 [1a (R1=Bu), 1b (R1=tBu)] react with tetraethyldiborane(6) to give the (Z)-1-chlorodimethylsilyl-1-diethylboryl-alkenes 2a,b. These alkenes react with N- or C-lithiated azoles (pyrazole, thiazole) by LiCl elimination and formation of the novel five-membered heterocycles 4a, 5b and 6b. In 5b and 6b...

Decacarbonyl-µ-bis(diphenylphosphino)methane triosmium crystallizes in the monoclinic space group P21/c with a = 24.422(5), b = 12.381(2), c = 24.788(5) Å, ß = 103.69(3)°, V = 7282 (2) Å3, and Z = 8. The molecule consists of a triangular arrangement of osmium atoms with the organic ligand bridging two adjacent osmium atoms at equatorial sites. The...