Low cost and eco-friendly activated carbon (AC) was prepared from a cheap precursor material, used tea leaves (UTLs), by chemical activation with phosphoric acid (PA) under optimum conditions, using central composite design (CCD) of response surface methodology (RSM). The conditions optimized were activation temperature, chemical impregnation ratio (IR) and activation time with % age yield, iodine (I2) and methylene blue (MB) number as the targeted responses. The optimal preparation conditions were determined as: activation temperature of 600 oC, impregnation ratio (IR) of 1.30 and activation time of 130 min, under which a carbon yield of 33.55 % and I2 and MB uptake of 1051 mg g-1 and 321 mg g-1 respectively, could be achieved. The AC produced by phosphoric acid activation under optimal conditions (PA-AC) was subsequently modified with hydrogen peroxide and anionic surfactant, sodium dodecyl sulfate (SDS). The optimal (PA-AC), hydrogen peroxide (PA-AC-HO) and SDS modified carbons (PA-AC-SDS) were utilized for cationic dyes removal from aqueous medium.PA-AC, PA-AC-HO and PA-AC-SDS were characterized by various physio-chemical techniques including TG/DTA, SEM, XRD, FTIR spectroscopy, BET surface area, Boehm’s titration, pHPZC and proximate-ultimate analysis. Results showed that all the three adsorbents have sufficient number of acidic functional groups and their pHPZC values lies in the acidic region. The pHPZC values of PA-AC, PA-AC-HO and PA-AC-SDS were found to be 4.60, 3.40, and 5.20, respectively. Boehm’s titration results showed that PA-AC-HO surface has more acidic groups than PA-AC and PA-AC-SDS. TG/DTA analysis of the three samples showed very small weight loss in the temperature range 110-1000 oC indicating high carbon and low volatile matter content which is supported by EDX and proximate analysis results. XRD analysis showed the amorphous nature of the three samples.PA-AC has larger BET surface area and micropore volume than PA-AC-SDS and PA-AC-HO while, PA-AC-HO has greater fraction of mesopore volume (57.83 %). The SEM study confirmed that the external surface of raw UTLs is rough with few small pores while that of PA-AC, PA-AC-HO and PA-AC-SDS is highly porous with numerous cavities which make them suitable to adsorb cationic dyes from aqueous solutions. Pore widening and some cracks were also observed on PA-AC-HO surface with a corresponding BET surface area and micropore volume decrease. The SEM analysis also showed that after cationic dyes uptake most of the pores disappeared in all the three AC samples due to saturation with dyes molecules. xi To find the efficiency of the prepared adsorbents, all the three AC samples were utilized for the adsorption of five cationic dyes BB-9, BY-2, BB-41, BG-4 and BV-3 from aqueous mediums by studying different process parameters. The uptake of all these dyes by PA-AC, PA-AC-HO and PA-AC-SDS was low in the acidic pH range (pH 2.0-4.0) and increased with increasing pH of the solution beyond 4.0. Dyes uptake per unit mass of adsorbents was highly dependent on dyes initial concentrations, contact time, adsorbent dose, particle size and ionic strength. Kinetic data was analyzed using different models to explain the rate and mechanism of BB-9, BY-2, BB-41, BG-4 and BV-3 adsorption onto PA- AC, PA-AC-HO and PA-AC-SDS. The adsorption data was described by pseudo-second order kinetic model having high coefficients of correlation (R2 ˃ 0.99), and the qe calculated were in close agreement with the experimentally determined adsorption amount (qe, exp) for each cationic dye at all the studied concentrations. The rate constant k1 (min-1) values for PA-ACHO were higher than PA- AC and PA-AC-SDS. Intra-particle diffusion and Boyd’s models verified that during interaction of the dyes with PA-AC, PA-AC-HO and PA-AC-SDS both film diffusion and intra-particle diffusion may occur parallel. Langmuir and Temkin isotherms models explained the equilibrium adsorption data very well as evident from R2 values. The value of binding energy constant (KL) for all adsorbents were higher at high temperature, showed favorable adsorption of dyes at higher temperature. Moreover, the values of separation factor (RL) lies between 0 and 1, confirming that adsorption of BB-9, BY-2, BB-41, BG-4 and BV-3 onto PA-AC, PA-AC-HO and PA-AC-SDS can be described very well by Langmuir model. The positive ∆Ho values showed endothermic nature of BB-9, BY-2, BB-41, BG-4 and BV-3 adsorption onto PA-AC, PA-AC-HO and PA-AC-SDS. The positive ∆So values suggested increased randomness at solid/liquid interface during the adsorption process which reflects high affinity of these adsorbent for cationic dyes. The ∆Go values were negative at all the temperatures studied, suggesting spontaneous nature of dyes adsorption. In binary systems the individual dyes adsorption capacities [qe,i(mg g-1)] and adsorption yield [Adi,%] were smaller than those estimated for each dye in single component solution, showing antagonistic adsorption of dyes. Regeneration of dyes loaded adsorbents was carried out by five consecutive cycles. Results showed that PA-AC has good regeneration capacity, followed by PA-AC-SDS and PA-AC-HO. Subject Headings: Surface Chemistry, Material Chemistry, Environmental Chemistry, Advanced Instrumental Techniques, Statistical Optimaization Techniques, Chemical Kinetics, Thermodynamics, Ion Exchange, Dyes and Pigments, Environmental remediation
شفیق الرحمن قدوائی شفیق الرحمن مرحوم اگر چہ شہرت و ناموری کے عام معیار سے کو ئی بڑے آدمی نہ تھے مگر اپنے ایثار و قربانی، اخلاق وکردار، اخلاص و عمل اور خاموش اور بے لوث خدمات کے لحاظ سے بہت سے بڑے بڑے لیڈروں پر فائق تھے، جامعہ ملیہ کے لئے تو انھوں نے اپنی زندگی وقف کردی تھی اور سرد و گرم دور میں بھی اس سے جدا نہ ہو ئے، اور یہ کہنا غلط نہ ہوگا کہ جامعہ انہی کی محنت و جانفشانی کی بدولت زندہ رہ گیا، ظاہر وباطن دونوں میں مسلمان اور اپنے اوصاف کی بنا پر ہر جماعت میں مقبول تھے، کا نگریس اور حکومت دونوں کے سنجیدہ طبقہ میں ان کا بڑا وقار و وزن اور اخلاقی اثر تھا، مگر وہ اتنے بے لوث تھے کہ کبھی اس اثر سے فائدہ اٹھانے کی کوشش نہیں کی، ان کو بنیادی تعلیم کا عملی تجربہ تھا، اس کے وہ ماہر تھے، اس لئے یو این او کی جانب سے اس کام کے لئے انڈونیشیا بھیجے گئے تھے، ابھی وہ وہیں تھے کہ گذشتہ الیکشن میں کانگریس نے ان کو دہلی اسمبلی کے لئے مقرر ہو ئے، مگر اس سے بھی ان کا فائدہ اٹھانے کا موقع نہ مل سکا، تھوڑے ہی دنوں کے بعد بیمار پڑگئے، اور چند مہینے بیمار رہ کر ۳؍ اپریل کو انتقال کیا، انتقال کے وقت کل ۵۳ سال کی عمر تھی جو سیاست کی دنیا میں عین شباب کی عمرہے، مسلمانوں میں اب ایسے مخلص اور باعمل آدمی مشکل سے پیدا ہوں گے، اﷲ تعالیٰ اس پیکر اخلاص کو اپنی رحمت و مغفرت سے سرفراز فرمائے۔ (شاہ معین الدین ندوی، اپریل ۱۹۵۳ء)
‘Abdullah bin al-Mubark was born in Marw’ one of the prime cities in Khurasan, (nowadays in the surroundings of Afghanistan and Central Asia), in the year 118 AH. In addition to his many talents, achievements and abilities, ‘Abdullah bin al-Mubarak was also gifted in literacy, particularly in the art of poetry. He held an eloquent tongue which was recognized by all who conversed with him and his language displayed the nature of someone who had been taught well. Most of the poetry which has been recorded from him is actually his advice to others, whether they were close friends or high-ranking Caliphs and Rulers. The topics spoken of concerned the common issues which had arisen in his time (e.g. Matters pertaining to theology, politics, the worldview, the community etc) and as always, they contained much wisdom and hence the books of history have sealed them and recorded them. This research article discussed Biography of Abdullah ibn Al Mubarak, The Islamic Ethics in his poetry, Impact of Rhetoric on his poetry with special concentration on the four kinds i.e. Citation, impact of Quranic words, Quranic pictorial and Quranic style on his poetry.
Impact of Drinking Water Contamination Caused by Hattar Industrial Estate on Health and Household Utility Economic activity of industry is posing a serious threat to the health and lives of communities living around. The compromised and unaware behavior of the people is affecting the human health and life and its impact spreads from individual to society in various dimensions. This multidisciplinary study attempts to identify, quantify and analyze the problem of industrial wastewater contamination into the drinking water of the communities and its impact on health and utility at household level. The study is based on primary data and in total 950 households interviewed and 305 drinking water samples collected from area affected by Hattar Industrial Estate (HIE) in Pakistan. The data is collected from two affected villages (Dingi and Motian) situated on the bank of industrial wastewater channel and from one reference village (Khanpur) located upstream with the same socio-economic characteristics as target villages. The study used Geographical Information Systems (GIS), epidemiology, environmental sciences and economic approach to analyze data. Based on laboratory tests, in drinking water of target villages, lead and Nickel is found above the guideline values of the World Health Organization (WHO). Single difference approach of with and without is adopted to analyze its impact. The associated diseases in both selected villages found to be high blood pressure, lipominingocele, renal disease, black gums, skin and joint pains. The statistical relationship between the contaminants and diseases was positive. Other variables of high significance included location, pollution awareness and perception of risk. Based on the principle of household‘s utility maximization three demand equations were estimated: 1. demand for health status, 2. Demand for mitigating activities and 3. Demand for avertive activities. The three demand equations are quantified in terms of marginal willingness to pay; opportunity cost of avertive measures and leisure; economic cost of water pollution; and welfare loss to the community. Marginal willingness to pay is estimated as Rs. 4142.03/- and Rs. 819.6/- per household/per annum for the target villages of Dingi and Motian respectively. Total opportunity cost of avertive measures and leisure for Dingi xi was Rs. 7955/- where for Motian Rs.4260/-. Total economic cost for Dingi and Motian was Rs.11889/- and Rs.10442 per household per annum respectively. The welfare loss to the community due to industrial water contamination was calculated as Rs. 5.8 million per annum for Dingi where Rs. 0.2 million per annum for Motian. The total welfare loss due to water contamination in both selected villages was Rs.6 million per annum. This welfare quantification, if extrapolated to other villages situated on the wastewater channel, can result in high monetary loss to the community. This monetary loss is in addition to the physical and psychological sufferings associated with diseases. The findings of the study cannot be generalized for all pollutants or all locations since it is based on data collected from households affected by heavy metal water contamination caused by HIE in Pakistan. However the majority of developing countries are facing similar types of problems and the results of this study can be helpful in the choice of better policy options. The results suggest that apart from environmental pollution, the economic and behavioral factors also contribute to the prevalence of disease. Therefore, policy initiatives should be focused on specific issues such as decisions on the location of industrial estates; inclusion of environmental awareness in the formal education; motivation to the community for participation in government or Non Government Organization(NGO) run programs for environmental awareness; and adoption of aversion and mitigation measures to save the communities from harmful effects of pollution.