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Removal of Selected Heavy Metals from Drinking Water Samples by Magnetic Graphic Carbon Nanostructures

Thesis Info

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External Link

Author

Muneeb Ur Rehman Khattak, Muhammad

Program

PhD

Institute

Hazara University

City

Mansehra

Province

KPK

Country

Pakistan

Thesis Completing Year

2017

Thesis Completion Status

Completed

Subject

Chemistry

Language

English

Link

http://prr.hec.gov.pk/jspui/bitstream/123456789/12884/1/Final%20Thesis%20%20Muneeb%20Khattak.pdf

Added

2021-02-17 19:49:13

Modified

2024-03-24 20:25:49

ARI ID

1676727081368

Similar


The heavy metal is considered as severe pollutants owing to their toxicity, persistence and bio-accumulative nature in environment. Drinking water contamination with different chemicals and heavy metals, released from different anthropogenic sources has become a global concern. The pollution of drinking water is a relatively new problem due to which increase in stress is arising as a result of unprecedented growth in population, urbanization, and industrialization in recent years. The contamination of water resources has important reflection for the environment and human health. The present study was aimed to determine the heavy metal contamination levels in ground water samples from various areas of Pakistan. Furthermore a novel adsorbent was prepared to remove heavy metals from drinking water. The determination of heavy metals in drinking water was carried out in the samples of selected districts from four provinces of Pakistan. The results showed that the level of Arsenic was found maximum 6.74 ug/L in DI Khan district of KPK whereas the maximum concentration of lead 9.38 ug/L were observed in drinking water samples from district Abbottabad of KPK province. The level of chromium and copper were found within the permisible limits of samples collected from selected districts of Khyber Pakhtunkhawa. Whereas the zinc was found 10.849 ug/L in the samples collected from district Abbottabad KPK. In case of Punjab province the highest concentration of chromium 6.80 ug/L was determined in the samples from district Bahawalpur whereas all the heavy metals concentration of all the studied samples were examined within the limits. The concentration of zinc was determined maximum 10.431 ug/L in the samples of district Bahawalpur followed by 10.38 ug/L in the samples collected from Lahore district. The contamination of heavy metals in the samples of drinking water from Sind province was noted highly contaminated with zinc 35.0 ug/L in the samples of district Hyderabad followed by 31.0 ug/L in the samples collected from district Karachi and 29.0 ug/L in the samples from district Sukkar. While Sukkar district showed the concentration of Arsenic 9.00 ug/L whereas the concentration of lead 7.321 ug/L was found higher in district Hyderabad samples. Maximum samples were found within the limits for heavy metals contamination in Baluchistan province however the zinc content 36.24 and 31.00 ug/L were noted highest value in the drinking water samples of Jaffarabad and Zhob districts respectively. Keeping in view the heavy metals contamination from various provinces of Pakistan, a novel adsorbent from water melon and melon waste were prepared to remove these heavy metals from drinking water. The magnetic carbon nano structure from water melon and melon waste were prepared in a specially designed chamber consists of an electric heater, inlet for nitrogen gas and an outlet for exhaust. The prepared adsorbents were then characterized by scanning electron Microscope (SEM) for size and surface morphology whereas X-ray diffratimeter (XRD) was used for confirmation of crytallinity. The EDX results showed the elemental analysis of Iron and oxygen followed by TG/DTA characterization for determination of its thermal stability. The kinetics studies showed that the Pseudo-first order kinetic model was best fit for the adsorbent prepared from water melon waste while the Pseudo-second order kinetics model was best fit for the adsorbents prepared from melon wastes. Removal of heavy metals (As, Pb, Cr, Cu and Zn) from aqueous solution has been investigated by batch studies and the adsorption of heavy metals on the prepared adsorbents was dependent on various factors like solution pH, adsorbent dosage, temperature, initial loading of contaminant and contact time. The adsorption on both adsorbents was highly affected by pH providing maximum adsorption above pH 7 whereas equilibrium was achieved in 280 mins for adsorbent prepared from water melon waste and 320 mins. for the adsorbents prepared from melon waste. Giles adsorption isotherm was C type for both the adsorbents and heavy metals except Giles isotherm for Arsenic and Chromium for melon and water melon waste which were L type. Freundlich isotherm model for adsorbent prepared from melon waste was recognized to be the best fit model indicating multi-layered adsorption on heterogeneous adsorption sites of the adsorbent with maximum adsorption capacity. Thermodynamic parameters indicated that heavy metals adsorption was spontaneous and endothermic in nature. The spontaneous character of the process is signified by the negative values of at different temperatures as well as shows high affinity of the heavy metals towards the prepared adsorbents. As the values of increases with the increase in temperature shows that at high temperature the adsorption process is more favorable for the heavy metals adsorption.
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7۔ با اثر طبقات کا اسلامی قوانین کی تنفیذ میں رکاوٹ بننا

7۔ با اثر طبقات کا اسلامی قوانین کی تنفیذ میں رکاوٹ بننا
حدود و قصاص قوانین کے نفاذکے راستہ میں ایک بڑی رکاوٹ ہمارے ملک کے بااثر طبقات ہیں جو اپنے طبقاتی مفادات کا ہر صورت میں تحفظ چاہتے ہیں۔ پاکستان کے ایک سابق وزیر خزانہ نے (1985ء کے لگ بھگ ) کہا تھا کہ پاکستان میں اسی ارب روپے کا ٹیکس حاصل ہونا چاہیے لیکن صرف بیس ارب روپے سرکاری خزانے میں جاتے ہیں۔ چالیس ارب روپے افسران کی جیب میں چلے جاتے ہیں اور بیس ارب روپے کا ٹیکس چوری ہوتا ہے۔ اگر چالیس ارب روپے افسران کی جیب میں جانے کا اندازہ صحیح ہے، تو جہاں پچاس فیصد سے زیادہ ٹیکس کی رقم ٹیکس جمع کرنے والوں کی جیب میں جاتی ہو، تو کیا وہ لوگ ٹیکس کا نیا نظام آنے دیں گے؟ ہر گز نہیں ۔ وہ اس میں رکاوٹ پیدا کریں گے ۔ جب زکوۃ کا نظام لایا گیا تو اس وقت اسلامی نظریاتی کونسل نے یہ کہا تھا کہ زکوۃ کے نظام کو کامیاب بنانے کے لیے ٹیکسوں کے نظام میں بڑی اور انقلابی تبدیلیاں لانے کی ضرورت ہے، ورنہ زکوۃ کا نظام کا میاب نہیں ہوگا ۔ اس وقت حکومت نے وعدہ کیا تھا کہ جلد ہی ٹیکسوں کے پورے نظام پر نظر ثانی کی جائے گی ۔ لیکن وہ تبدیلیاں نہیں ہوئیں اور ٹیکسوں کا نظام اسی طرح رائج ہے 503۔ اس کی بنیادی وجہ یہ ہے کہ ایک بہت بڑے طبقے کا مفاد اس نظام سے وابستہ ہے ۔ وہ طبقہ اس میں کوئی تبدیلی اور اصلاح نہیں ہونے دے گا ۔ بینکنگ اور ٹیکسوں کے نظام میں درجنوں بار اصلاحات تجویز ہوئیں لیکن وہ نافذ نہیں ہو سکیں، کیونکہ اس سے کئی با اثر طبقات کے مفادات پر زد پڑتی تھی۔

THE EFFECTS OF A PRAGMATIC SET OF INTERVENTIONS ON THE SHOULDER RANGE OF MOTION IN MALES AND FEMALES WITH SHOULDER PAIN: A CLINICAL TRIAL

Background and Aim: The effects of novel set of interventions are known but their effects with respect to gender are not known. This study aim to determine the effects of novel set of interventions on shoulder range of motion in males and females with shoulder pathology. Methodology: This study was of quasive experimental design. Thirty subjects of mean age (±SD) of 43. 23±10 years with shoulder pathology and restricted ROM were recruited. The major criteria for recruitment were 18-60 years of age. The general contraindications of manual therapy were the exclusion criteria. Shoulder functional movement and range of motion were the outcome measures.  Results: The mean % (SD) change for RUBB was 15.04±11.57for males and  14.49±10.44 for males. The change for RDBN was also significant (<0.00) from baseline and the % change in mean was 14.93±11.0 for males and 12.60±9.06 for females. The changes were well above the highly clinical meaningful difference (>0.8). It is further observed that the differences in gender were non-significant (P>0.05). Conclusion: The pragmatic set of interventions affect both the genders equally and improve shoulder range of motion and functional movements.  However, the results must be interpreted cautiously because of the inadequate sample size.

Synthesis Characterization and Pharmacological Screening of Sulfonated Derivatives of Piroxicam

Medicinal chemistry is a discipline associated with the designing, synthesis, and development of drugs used in different pathophysiological conditions. Small organic compounds or biologics are mostly studied in medicinal chemistry but the key focus is on small molecules to develop new synthetic agents for human use. These small molecules are usually heterocyclic compounds, hold a ring in their structure along with heteroatoms in addition to the carbon. Heterocyclic compounds are abundantly present in nature and very important from the therapeutic and economic point of view. Detailed information on the pharmacological activities of each organic compound is a challenge for the medicinal chemists because a large of number of synthetic organic compounds has been prepared currently. Therefore, the idea of structure activity relationship has been used to explain the variation in biological activity of organic compounds. Structure activity relationship is used in lead optimization to improve the efficacy and minimize the toxicity of the molecules. The biology oriented synthesis "BIOS" is a starting point for the search of new therapeutic agents. It is an approach for the generation of libraries of compounds for their biological applications. Non-steroidal anti-inflammatory drugs are an important class of organic compounds, having widespread applications in different diseases and most commonly used as analgesic, antipyretic and anti-inflammatory agents. They are used for the management of various acute and chronic inflammatory conditions alone or in combination with opioid analgesics. Oxicam is comparatively a new class of drugs consists of enolic acid compounds which possess analgesic and anti-inflammatory effects. Their structure contains 1, 2-benzothiazene nucleus, substituted at position-3 with carboxamide. Piroxicam belongs to the oxicam family discovered in 1972. It is the first member of this class and has marked analgesic and antipyretic properties and therefore, has been used clinically for the treatment of persistent inflammatory disorders for the last 30 years. Chemically, piroxicam is 4-hydroxy-2-methyl-2H-1, 2-benzothiazine-1-(N-(2 pyridinyl) carboxamide)-1, 1-dioxide. It is a heterocyclic compound and consists of benzene and thiazine rings. Benzo represents benzene while thiazine represents a six-membered ring in benzothiazine. It acts by blocking the cyclooxygenase enzymes and inhibiting the synthesis of prostaglandins. Due to the existence of enolic hydroxy (OH) group, piroxicam presented fascinating structural properties which prompted the medicinal chemists and pharmacologists for further research. The present study was designed to synthesize and characterize the piroxicam derivatives and screened them for in-vivo and in-vitro biological activities. Piroxicam derivatives (1-18) were prepared by dissolving piroxicam with commercially available alkyl/aryl sulfonyl chloride and triethylamine in tetrahydrofurane as a solvent, in a round bottom flask with constant stirring at room temperature. After the completion of the reaction, the resulting products were filtered, washed with hot n-hexane and excess of solvent was removed under vacuum at reduced pressure. Different spectroscopic procedures like 1H-NMR, EIMS, IR, UV and CHN analysis were used for structural elucidation of newly synthesized piroxicam derivatives and subjected to biological screening in order to prove that changing the substituent''s modifies the inhibitory potential of the individual derivative as an evident of structure activity relationship studies. The compounds were evaluated for the antinociceptive activity at 5, 10, 20 and 30 mg/kg doses. The compounds were found to be active in acetic acid induced writhing test but inactive in hot plate test for analgesia, indicating that the compounds only possess the peripheral mechanism and no central mechanism is involved as compared with standards piroxicam and tramadol respectively. Anti-inflammatory activity was determined in the carrageenan induced paw edema model in mice. The derivatives were tested at 10, 20 and 30 mg/kg doses and most of them were found to be significantly potent as compared with standard piroxicam. The piroxicam analogues when screened for the antipyretic effect in Brewer’s yeast induced pyrexia model in mice at 10, 20 and 30 mg/kg doses, the prominent antipyretic effects were observed as compared with standard paracetamol. The results showed that the compounds exhibited significant (*P < 0.05, **P < 0.01 and ***P < 0.001.) dose dependent antinociceptive, anti-inflammatory and antipyretic activities when compared with standards. The analogues were found to be safe in acute toxicity test at the doses of 50, 100 and 150 mg/kg i.p., and no gross mortality or behavioral changes were observed during 24 hours assessment time. The piroxicam derivatives were also screened for the different in-vitro activities. In in-vitro antiglycation assay, the compounds showed varying degree of antiglycation potential when compared with standard “rutin”. Compound 2, 4, and 7 exhibited excellent antiglycation activity with better potency than the reference. In in-vitro 3-[4, 5-dimethylthiazol-2-yl]-2, 5-diphenyl tetrazolium cytotoxicity assay, piroxicam derivatives exhibited varying degree of cytotoxic activity against breast cancer cell lines when compared with standard “doxorubicin”. Compound 4, 17 and 18 showed moderate anticancer activity while compound 3 showed low growth inhibitory activity. The derivatives were also screened for the in-vitro immunomodulatory activity against the standard “ibuprofen”. None of the compound was found to be active in the in-vitro immunomodulatory activity. It concludes that, changing the substituent or changing the position of substituent on aromatic ring does not impart any activity to the compounds. Results of in-vitro dipeptidyl peptidase-IV inhibitory assay showed that the substitution does not noticeably change the activity of the compounds but impart a weak inhibitory activity to the compounds 1, 4, 11, 13 and 14. Other piroxicam derivatives of this series were inactive toward in-vitro dipeptidyl peptidase-IV inhibitory assay. In case of in-vitro leishmanicidal activity, compounds 7, 8, 10, 13, 14 and 17 showed good to low leishmanicidal activity while other compounds of this series having less than 100 % inhibition values and therefore concluded them as inactive. It can be concluded that, some piroxicam derivatives possess potent, good/low in-vitro antiglycation, anticancer, dipeptidyl peptidase-IV inhibitory and leishmanicidal potential as compared with standards but inactive in in-vitro immunomodulatory activity. Findings of this research work strongly support the use of piroxicam derivatives as analgesic, antipyretic, anti-inflammatory, anti-glycating, dipeptidyl peptidase-IV inhibitors, leishmanicidal and anticancer agents. However, further comprehensive research work on piroxicam derivatives as well as their use for selective inhibition of cyclooxygenase-2 enzyme is necessary in order to minimize the gastrointestinal complications.