Displaying publications 1 - 20 of 199 in total

  1. Nur ‘Aishah Zarime, Wan Zuhairi Wan Yaacob
    Sains Malaysiana, 2016;45:1905-1912.
    Penyelidikan ini mengkaji tingkah laku cadmium (Cd) melalui tanah baki granit yang dipadatkan. Sampel tanah baki granit telah diambil di kawasan Broga, Selangor dan dikaji menggunakan tiga kaedah ujian utama iaitu; ujian fizikal (taburan saiz butiran, had-had Atterberg, graviti tentu, pemadatan dan kebolehtelapan), ujian kimia (pH, bahan organik, luas permukaan spesifik (SSA) dan kadar pertukaran kation (CEC) serta ujian mini kolum turasan. Melalui ujian kolum turasan, konsep kebolehtelapan turus menurun digunakan yang melibatkan tiga faktor iaitu halaju/daya-G, ketebalan sampel dan jenis larutan yang digunakan. Graf lengkung bulus menunjukkan kepekatan Cd dalam tanah baki granit semakin meningkat dengan peningkatan halaju. Urutan kapasiti penjerapan semakin meningkat terhadap kadar putaran alat emparan/daya tarikan graviti (G); 230G>520G>920G>1440G. Pergerakan logam berat melalui tanah baki juga meningkat dengan peningkatan halaju/daya-G. Lengkung bulus juga menunjukkan pergerakan Cd secara songsang dengan ketebalan lapisan tanah di dalam kolum. Masa penembusan bagi ketebalan 20 mm juga lebih lama berbanding ketebalan 15 dan 10 mm. Manakala jumlah Cd yang terjerap oleh tanah baki granit dalam larutan campuran adalah rendah berbanding larutan tunggal (masa yang singkat untuk menembusi lengkung bulus). Tanah baki granit juga mempunyai kapasiti penampanan yang rendah (pHfinal = 4 - 7). Kajian ini menunjukkan bahawa pencirian fiziko-kimia dan sifat penjerapan tanah dengan menggunakan ujian mini kolum turasan mempunyai kaitan yang kuat untuk mencirikan tanah baki granit untuk dijadikan pelapik lempung tereka bentuk.
    Matched MeSH terms: Cadmium
  2. Rizwan Z, Zakaria A, Mohd Ghazali MS, Jafari A, Din FU, Zamiri R
    Int J Mol Sci, 2011;12(2):1293-305.
    PMID: 21541059 DOI: 10.3390/ijms12021293
    Two different concentrations of CdCl(2) and (NH(2))(2)CS were used to prepare CdS thin films, to be deposited on glass substrate by chemical bath deposition (CBD) technique. CdCl(2) (0.000312 M and 0.000625 M) was employed as a source of Cd(2+) while (NH(2))(2)CS (0.00125 M and 0.000625 M) for S(2-) at a constant bath temperature of 70 °C. Adhesion of the deposited films was found to be very good for all the solution concentrations of both reagents. The films were air-annealed at a temperature between 200 °C to 360 °C for one hour. The minimum thickness was observed to be 33.6 nm for film annealed at 320 °C. XRD analyses reveal that the films were cubic along with peaks of hexagonal phase for all film samples. The crystallite size of the films decreased from 41.4 nm to 7.4 nm with the increase of annealing temperature for the CdCl(2) (0.000312 M). Optical energy band gap (E(g)), Urbach energy (E(u)) and absorption coefficient (α) have been calculated from the transmission spectral data. These parameters have been discussed as a function of annealing temperature and solution concentration. The best transmission (about 97%) was obtained for the air-annealed films at higher temperature at CdCl(2) (0.000312 M).
    Matched MeSH terms: Cadmium Compounds/chemistry*
  3. Baneshi MM, Ghaedi AM, Vafaei A, Emadzadeh D, Lau WJ, Marioryad H, et al.
    Environ Res, 2020 04;183:109278.
    PMID: 32311912 DOI: 10.1016/j.envres.2020.109278
    The water sources contaminated by toxic dyes would pose a serious problem for public health. In view of this, the development of a simple yet effective method for removing dyes from industrial effluent has attracted interest from researchers. In the present work, flat sheet mixed matrix membranes (MMMs) with different physiochemical properties were fabricated by blending P84 polyimide with different concentrations of cadmium-based metal organic frameworks (MOF-2(Cd)). The resultant membranes were then used for simultaneous removal of eosin y (EY), sunset yellow (SY) and methylene blue (MB) under various process conditions. The findings indicated that the membranes could achieve high water permeability (117.8-171.4 L/m2.h.bar) and promising rejection for simultaneous dyes removal, recording value of 99.9%, 81.2% and 68.4% for MB, EY and SY, respectively. When 0.2 wt% MOF-2(Cd) was incorporated into the membrane matrix, the membrane separation efficiency was improved by 110.2% and 213.3% for EY and SY removal, respectively when compared with the pristine membrane. In addition, the optimization and modeling of membrane permeate flux and dye rejection was explored using response surface methodology. The actual and model results are in good agreement with R2 of at least 0.9983 for dye rejection and permeate flux. The high flux of the developed MMMs coupled with effective separation of dyes suggests a promising prospect of using P84 polyimide MMMs incorporated with MOF-2(Cd) for water purification.
    Matched MeSH terms: Cadmium*
  4. Luqman Chuah Abdullah, Saidatul Shima, J., Choong, Thomas S.Y., Muhammad
    A series of batch laboratory studies were conducted to investigate the suitability of activated carbon SA2 for the removal of cadmium ions and zinc ions from their aqueous solutions. The single component equilibrium data were analyzed using the Langmuir and Freundlich isotherms. Overall, the Langmuir isotherm showed a better fitting for all adsorptions under investigation in terms of correlation coefficient and error analysis (SSE only 18.2 for Cd2+ and 47.95 for Zn2+). As the binary adsorption is competitive, extended Langmuir models could not predict the binary component isotherm well. The modified extended Langmuir models were used to fit the binary system equilibrium data. The binary isotherm data could be described reasonably well by the modified
    extended Langmuir model, as indicated in the error analysis.
    Matched MeSH terms: Cadmium
  5. Arman HD, Poplaukhin P, Tiekink ERT
    Acta Crystallogr E Crystallogr Commun, 2017 Apr 01;73(Pt 4):488-492.
    PMID: 28435704 DOI: 10.1107/S2056989017003516
    The title compound, {[Cd(C9H11N2S2)2]·C6H7N} n , features two μ2-κ(3)-di-thio-carbamate ligands each of which chelates one Cd(II) atom, via the S atoms, while simultaneously bridging to another via the pyridyl-N atom. The result is a two-dimensional coordination polymer extending parallel to the ab plane with square channels along the b axis. The Cd(II) atom geometry is based on a distorted cis-N2S4 octa-hedron. The 3-methyl-pyridine mol-ecules reside in the channels aligned along the b axis, being held in place by methyl-ene-C-H⋯N(3-methyl-pyridine) and (3-methyl-pyridine)-C-H⋯π(pyrid-yl) inter-actions. Pyridyl-C-H⋯S and di-thio-carbamate-methyl-C-H⋯π(pyrid-yl) inter-actions provide connections between layers along the c axis.
    Matched MeSH terms: Cadmium
  6. Hiew BYZ, Lee LY, Lee XJ, Thangalazhy-Gopakumar S, Gan S
    Environ Sci Pollut Res Int, 2021 Aug;28(30):40608-40622.
    PMID: 32601866 DOI: 10.1007/s11356-020-09594-3
    Heavy metals released by various industries are among the major pollutants found in water resources. In this research, biosorption technique was employed to remove cadmium (Cd2+) from an aqueous system using a novel biosorbent developed from okara waste (OW), a residue from soya bean-based food and beverage processing. Characterisation results revealed that the OW biosorbent contained functional groups such as hydroxyl-, carboxyl- and sulphur-based functional groups, and the surface of the biosorbent was rough with multiple fissures which might be the binding sites for the pollutant. The effects of dosage, solution pH, initial Cd2+ concentration, temperature and contact time were investigated using batch adsorption mode. The biosorption equilibrium and kinetic were best described by the Langmuir and Elovich models, respectively. The maximum biosorption capacities predicted by the Langmuir model were 10.91-14.80 mg/g at 30-70 °C, and the biosorption process was favourable as evident from 0 < RL < 1. The uptake of Cd2+ by the OW biosorbent was spontaneous and endothermic. The plausible biosorption mechanisms of this study could be ionic exchange, hydrogen bonding and electrostatic interactions. The Cd2+ loaded OW biosorbent could be regenerated using 0.4 M of HCl solution and regeneration was studied for 4 adsorption-desorption cycles. The present investigation supported that OW can be reused as a value-added biosorbent product for the removal of Cd2+ from the contaminated water.
    Matched MeSH terms: Cadmium/analysis
  7. Heng LY, Jusoh K, Ling CH, Idris M
    Bull Environ Contam Toxicol, 2004 Feb;72(2):373-9.
    PMID: 15106775
    Matched MeSH terms: Cadmium/pharmacokinetics; Cadmium/toxicity*
  8. Daud MN, Zakaria A, Jafari A, Ghazali MS, Abdullah WR, Zainal Z
    Int J Mol Sci, 2012;13(5):5706-14.
    PMID: 22754325 DOI: 10.3390/ijms13055706
    CdTe film was deposited using the electrophoretic deposition technique onto an ITO glass at various bath temperatures. Four batch film compositions were used by mixing 1 to 4 wt% concentration of CdTe powder with 10 mL of a solution of methanol and toluene. X-ray Diffraction analysis showed that the films exhibited polycrystalline nature of zinc-blende structure with the (111) orientation as the most prominent peak. From the Atomic Force Microscopy, the thickness and surface roughness of the CdTe film increased with the increase of CdTe concentration. The optical energy band gap of film decreased with the increase of CdTe concentration, and with the increase of isothermal bath temperature. The film thickness increased with respect to the increase of CdTe concentration and bath temperature, and following, the numerical expression for the film thickness with respect to these two variables has been established.
    Matched MeSH terms: Cadmium Compounds/chemistry*
  9. Lim HH, Ong CN, Domala Z, Phoon WO
    PMID: 6658508
    Blood cadmium levels in Malaysian pregnant women were determined. There was no significant urban-rural difference in mean blood cadmium levels.
    Matched MeSH terms: Cadmium/blood*
  10. Rivai IF, Koyama H, Suzuki S
    Bull Environ Contam Toxicol, 1990 Jun;44(6):910-6.
    PMID: 2354269
    Matched MeSH terms: Cadmium/analysis*
  11. Goh CL, Sethupathi S, Bashir MJ, Ahmed W
    J Environ Manage, 2019 May 01;237:281-288.
    PMID: 30802752 DOI: 10.1016/j.jenvman.2018.12.103
    In this work, the influence of pyrolysis temperature on the physicochemical properties of palm oil mill sludge biochar (POSB) and its adsorption properties towards cadmium (Cd) and copper (Cu) was investigated. Characterization experiments suggested that POSBs' surface functional groups play the major role in the adsorption process. POSB pyrolyzed at 400 °C showed the best characteristics for Cu and Cd removal. Adsorption study indicated that contact time and shaking speed enhances the adsorption capacity of POSB. It was affirmed that pH adjustment is not necessary for POSB to adsorb Cu and Cd. Mechanism studies fitted well with Langmuir and Pseudo-Second Order model. Thermodynamic parameters indicated that the adsorption was spontaneous, endothermic and correspond to chemical adsorption. The highest uptakes of Cu and Cd were recorded at 48.8 mg/g and 46.2 mg/g respectively. This work verifies that the temperature used for palm oil mill sludge (POS) pyrolysis and adsorption condition played the most prominent role in Cu and Cd removal from aqueous solutions.
    Matched MeSH terms: Cadmium*
  12. Ahmed MF, Mokhtar MB
    PMID: 32344678 DOI: 10.3390/ijerph17082966
    Although toxic Cd (cadmium) and Cr (chromium) in the aquatic environment are mainly from natural sources, human activities have increased their concentrations. Several studies have reported higher concentrations of Cd and Cr in the aquatic environment of Malaysia; however, the association between metal ingestion via drinking water and human health risk has not been established. This study collected water samples from four stages of the drinking water supply chain at Langat River Basin, Malaysia in 2015 to analyze the samples by inductivity coupled plasma mass spectrometry. Mean concentrations of Cd and Cr and the time-series river data (2004-2014) of these metals were significantly within the safe limit of drinking water quality standard proposed by the Ministry of Health Malaysia and the World Health Organization. Hazard quotient (HQ) and lifetime cancer risk (LCR) values of Cd and Cr in 2015 and 2020 also indicate no significant human health risk of its ingestion via drinking water. Additionally, management of pollution sources in the Langat Basin from 2004 to 2015 decreased Cr concentration in 2020 on the basis of autoregression moving average. Although Cd and Cr concentrations were found to be within the safe limits at Langat Basin, high concentrations of these metals have been found in household tap water, especially due to the contamination in the water distribution pipeline. Therefore, a two-layer water filtration system should be introduced in the basin to achieve the United Nations Sustainable Development Goals (SDGs) 2030 agenda of a better and more sustainable future for all, especially via SDG 6 of supplying safe drinking water at the household level.
    Matched MeSH terms: Cadmium/toxicity
  13. Chai YC, Jun HK
    J Nanosci Nanotechnol, 2019 Jun 01;19(6):3505-3510.
    PMID: 30744778 DOI: 10.1166/jnn.2019.16099
    Nanosize semiconductors have been used as active sensitizers for the application of quantum dot-sensitized solar cells (QDSSC). "Green" sensitizers are introduced as an alternative for the toxic Cd and Pb based compounds. In this work, Bi₂S₃ quantum dots (QDs) were fabricated and used as sensitizers in QDSSC. QDs were grown on TiO₂ electrode via solution dipping process. Although the performance of "green" QDSSC is not as high as that of CdS or CdSe based QDSSCs, its performance can be enhanced with post heat treatment. The effect is dependent on the heat treatment temperature profile where gradual increase of sintering temperature is preferred. The effects of post heat treatment on Bi₂S₃ sensitized TiO₂ electrodes are investigated and discussed.
    Matched MeSH terms: Cadmium; Cadmium Compounds
  14. Zailina H, Najibah H, Aiezzati AN, Praveena SM, Patimah I
    Biomed Res Int, 2014;2014:797603.
    PMID: 25530970 DOI: 10.1155/2014/797603
    A cross-sectional study was carried out to determine the arsenic (As) and cadmium (Cd) concentrations in blood, urine, and drinking water as well as the health implications on 100 residents in an urban and a rural community. Results showed the blood As, urinary Cd, DNA damage, and water As and Cs were significantly (P < 0.001) higher in the rural community. Findings showed significant (P < 0.005) correlations between blood As and DNA damage with household income, years of residence, and total glasses of daily water consumption among the rural residents. The urinary NAG concentrations, years of residence, milk powder intake (glass/week), and seafood intake (per week) were significantly correlated (P < 0.005) with urinary Cd concentrations among respondents. In addition, urinary Cd level significantly influenced the urinary NAG concentrations (P < 0.001). The rural respondents experienced significantly higher lymphocyte DNA damage and blood As influenced by their years of residence and water consumption. The Cd in drinking water also resulted in the rural respondents having significantly higher urinary NAG which had a significant relationship with urinary Cd.
    Matched MeSH terms: Cadmium/blood; Cadmium/toxicity*; Cadmium/urine
  15. Jamal P, Muyibi SA, Syarif WM
    Med J Malaysia, 2008 Jul;63 Suppl A:105-6.
    PMID: 19025007
    Pollutants, especially heavy metals like cadmium, Chromium, lead and mercury, play a significant role in causing various water-borne diseases to humans. This study evaluates the sorption properties of bioactive constituents of Moringa oleifera seeds for decontamination of cadmium at laboratory scale. The performance of the bioactive constituent extracted by salt extraction method was enhanced by process optimization with various concentration of bioactive dosages, agitation speed, contact time, pH and heavy metal concentrations. Statistical optimization was carried out for evaluating the polynomial regression model through effect of linear, quadratic and interaction of the factors. The maximum removal of cadmium was 72% by using 0.2 g/l of bioactive dosage.
    Matched MeSH terms: Cadmium/toxicity*; Cadmium Poisoning/prevention & control*
  16. Zal U'yun Wan Mahmood, Norfaizal Mohamad, Nur Nazirah Johari
    Accumulation kinetic trends of cesium and cadmium in the Penaeus monodon were studied using Cs-134 and Cd-109 as a tracer. The objective of this study was to quantify the uptake and loss/depuration kinetic of these two radionuclides in the Penaeus monodon. Uptake and loss/depuration kinetic of these two radionuclides in the Penaeus monodon were varied widely, displayed a simple double kinetic model of linear and exponential trend with time unless modified by moulting at the stage in the mount cycle. Therefore, the variation of Cs-134 and Cd-109 bio-concentration factor could be concluded considerably influence by moulting cycle, environmental and biological condition as well as physico-chemical that direct effects on their uptake and loss/depuration kinetic.
    Matched MeSH terms: Cadmium
  17. Mahmoudi E, Azizkhani S, Mohammad AW, Ng LY, Benamor A, Ang WL, et al.
    J Environ Sci (China), 2020 Dec;98:151-160.
    PMID: 33097147 DOI: 10.1016/j.jes.2020.05.013
    Graphene oxide is a very high capacity adsorbent due to its functional groups and π-π interactions with other compounds. Adsorption capacity of graphene oxide, however, can be further enhanced by having synergistic effects through the use of mixed-matrix composite. In this study, silica-decorated graphene oxide (SGO) was used as a high-efficiency adsorbent to remove Congo red (CR) and Cadmium (II) from aqueous solutions. The effects of solution initial concentration (20 to 120 mg/l), solution pH (pH 2 to 7), adsorption duration (0 to 140 min) and temperature (298 to 323 K) were measured in order to optimize the adsorption conditions using the SGO adsorbent. Morphological analysis indicated that the silica nanoparticles could be dispersed uniformly on the graphene oxide surfaces. The maximum capacities of adsorbent for effective removal of Cd (II) and CR were 43.45 and 333.33 mg/g based on Freundlich and Langmuir isotherms, respectively. Langmuir and Freundlich isotherms displayed the highest values of Qmax for CR and Cd (II) adsorption in this study, which indicated monolayer adsorption of CR and multilayer adsorption of Cd (II) onto the SGO, respectively. Thermodynamic study showed that the enthalpy (ΔH) and Gibbs free energy(ΔG) values of the adsorption process for both pollutants were negative, suggesting that the process was spontaneous and exothermic in nature. This study showed active sites of SGO (π-π, hydroxyl, carboxyl, ketone, silane-based functional groups) contributed to an enormous enhancement in simultaneous removal of CR and Cd (II) from an aqueous solution, Therefore, SGO can be considered as a promising adsorbent for future water pollution control and removal of hazardous materials from aqueous solutions.
    Matched MeSH terms: Cadmium
  18. Rabeea Munawar, Ehsan Ullah Mughal, Muhammad Waseem Mumtaz, Muhammad Zubair, Jamshaid Ashraf, Zofishan Yousaf, et al.
    Sains Malaysiana, 2018;47:27-34.
    The prime objective of the present research work was to evaluate the efficiency of bio-machine for the removal of Cadmium (Cd) from aquatic systems. Aspergillus niger fungus was used as bio-machine to remove Cd from aquatic systems. Twenty three different strains (IIB-1 to IIB-23) were isolated from industrial effluents and the Langmuir and Freundlich models were applied to the best Cadmium removal strain IIB-23 in order to obtain the adsorption parameters. Different parameters such as pH, temperature, contact time, initial metal concentratio, and biomass dosage on the biosorption of Cd were studied. The percent removal of Cd initially increased with an increase in pH ranging from 5.5-6.5 and then decreased by increasing pH from 7.0-7.5. An optimized pH used for Cd removal from aquatic systems was found to be 6.5. Additionally, an optimum amount of biomass was 1.33 g for the maximum removal of Cd from the aqueous solutions with initial metal concentration of 75 mg/L. The results obtained thus indicated that Langmuir model is the best suited for the removal of Cd from aquatic systems.
    Matched MeSH terms: Cadmium
  19. You X, Liu S, Dai C, Zhong G, Duan Y, Guo Y, et al.
    Environ Sci Pollut Res Int, 2020 Nov;27(33):41623-41638.
    PMID: 32691313 DOI: 10.1007/s11356-020-10149-9
    Ethylenediaminetetraacetic acid (EDTA) can serve as a washing agent in the remediation of low-permeability layers contaminated by heavy metals (HMs). Therefore, batch adsorption experiments, where pure quartz (SM1) and mineral mixtures (SM2) were used as typical soil minerals (SMs) in low-permeability layers, were implemented to explore the effects of different EDTA concentrations, pH, and exogenous chemicals on the HM-SM-EDTA adsorption system. As the EDTA concentration increased, it gradually cut down the maximum Cd adsorption capacities of SM1 and SM2 from approximately 135 to 55 mg/kg and 2660 to 1453 mg/kg; and the maximum Pb adsorption capacities of SM1 and SM2 were reduced from 660 to 306 mg/kg and 19,677 to 19,262 mg/kg, respectively. When the initial mole ratio (MR = moles of HM ions/sum of moles of HM ions and EDTA) was closer to 0.5, the effect of EDTA was more effective. Additionally, EDTA worked well at pH below 7.0 and 4.0 for Cd and Pb, respectively. Low-molecular-weight organic acids (LMWOAs) affected the system mainly by bridging, complexation, adsorption site competition, and reductive dissolution. Cu2+, Fe2+ ions could significantly increase the Cd and Pb adsorption onto SM2. Notably, there were characteristic changes in mineral particles, including attachment of EDTA and microparticles, agglomeration, connection, and smoother surfaces, making the specific surface area (SSA) decrease from 16.73 to 12.59 m2/g. All findings indicated that EDTA could effectively and economically reduce the HM adsorption capacity of SMs at the reasonable MR value, contact time, and pH; EDTA reduced the HM adsorption capacity of SMs not only by complexation with HM ions but also by decreasing SSA and blocking active sites. Hence, the acquired insight from the presented study can help to promote the remediation of contaminated low-permeability layers in groundwater.
    Matched MeSH terms: Cadmium
  20. Hossen MF, Hamdan S, Rahman MR
    ScientificWorldJournal, 2014;2014:924360.
    PMID: 25538965 DOI: 10.1155/2014/924360
    The concentrations were ranged from 1.35 ± 0.16 to 2.22 ± 0.34 µg/g (dry weight) and 2.65 ± 0.34 to 4.36 ± 0.53 µg/g (dry weight) for Cd and Pb, respectively, in blood cockle Anadara granosa from four sites of Sabang River, namely, Kampung Sambir, Kampung Tambirat, Beliong Temple, and Kampung Tanjung Apong, which are located at Asajaya, Sarawak, Malaysia. All values exceeded safety limits set by Malaysian Food Regulation (1985). It may be the cause of serious human health problems after long term consumption. Thus, consumer should have consciousness about such type of seafood from mentioned sites and need further investigation.
    Matched MeSH terms: Cadmium/analysis*
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