The discharge of heavy metals into aquatic ecosystems has become a matter of concern over the last few decades. They are extremely toxic elements, which can seriously affect plants and animals and have been involved in causing a large number of afflictions. Due to the high costs of commercial adsorbents, biosorption is an economically feasible way to perform the treatment of potentially toxic species-containing effluents. It is the sequestration of metals by the dead natural material called biosorbent. This research presents experimental optimization of different engineering parameters such as Biosorbent type, Immobilization method, initial solution pH, flow rate, Initial metal concentration and Desorbing agent for the removal of Cu(II). Three types of wastes namely Crop wastes (CW) including Bagasse, Rice Husk, Rice Straw, Wheat Straw, Waste leaves (WL) including Peeple Leaves, Semal Leaves and Dry fruit Waste (DW) including Almond Shell and Walnut shell were selected as they are abundantly available in local areas. First of all, each biosorbent was prepared through washing, crushing and grinding followed by size analysis through seven ASTM screens. Detailed size analysis was performed and presented for the first time in literature to link it with biosorption. This data was used to calculate different mean diameters namely volume surface mean, mass mean and length mean diameters. Size frequency curve was also plotted. For almond shell the volume surface mean diameter showed close resemblance to the median obtained from the size frequency curve while for all the remaining biosorbents, mass mean diameter came out to be representative diameter. Scanning Electron Microscopy was performed to establish different aspects (Physical and chemical) of biosorbent structure. CW showed needle like particles with complex flaky or porous structure. LW showed cylindrical particles with holes while DW showed aggregatesof small particles. FTIR analysis showed typical lignocellulosic profile for each biomass showing the presence of multiple functional groups including –OH, -COOH. XRD showed amorphous nature of the biosorbents. These characterizations showed that selected biosorbent possess structure suitable for biosorption. Selection of the optimum biosorbent was performed through typical kinetic and equilibrium experiments. In these experiments WL showed highest uptake of Cu(II) while CW and DW showed intermediate to low uptakes. Biosorption generally takes place in acidic environment. Therefore, stability of the selected biosorbents (Wheat Straw, Peeple leaves, Seemal Leaves, Almond Shell and Rice Husk) in 0.1M HNO 3 was tested. Almond Shell showed best and WL showed worst results. Thus, Almond Shell (AS) was selected as optimum Biosorbent. This approach has been applied for the first time to select an optimum biosorbent. Among different options of continuous contactors, fixed bed column is preferred due to its effective utilization of biomass bed and subsequent separation from the adsorbate solution. The most important parameter in the fixed bed operation is the nature of immobilization of the biomass. Generally, entrapment of the biosorbent is being performed to apply it in the fixed bed column. However, this process results in addition of a resistive layer of immobilizing media which hinders the mass transfer. Therefore, a novel surface immobilization mm and have complex structure. Braummer-Emmett-Teller (BET) area of beads showed a suitable adsorption area 0.8094 m 2 /g. For fixed bed experiments, optimum pH was estimated to be 4.6. It was an intermediate pH between two extremes i.e., point of zero charge (pH = 3.8) and point of precipitation (pH =5.1). Up flow arrangement was selected due to its inherent capability to avoid channelling. Bed height was selected to 20 cm to avoid axial dispersion of the Cu(II). Column experiments were performed at 19.7mL/min and 36 mL/min to determine optimum flow rate at 10 ppm Cu(II) concentration. Time required to achieve 50 % break through was greater in case of 19.7 mL/min than 36 mL/min. 19.7 mL/min flow rate corresponded to about 3 min residence time in the column and taken as optimum flow rate. In order to determine the optimum influent concentration three column experiments were performed at different initial concentration namely 10 ppm, 50 ppm and 100 ppm. As, expected very quick breakthrough took place at 50 ppm and 100 ppm. Hence, 10 ppm was selected an optimum initial concentration. HNO 3 and NaOH were selected to determine the optimum desorbent. These chemicals were selected due to the fact that H + and Na + ’ metals. Experiments showed that HNO 3 recovered much more Cu(II) ions than NaOH. Also, in case of NaOH, a notable deterioration of immobilized beads was found. Almond shell was identified as an optimum biosorbent as it showed moderate uptake and highest acid resistance amongst selected biosorbent. Kinetic modelling showed that, pseudo 2 nd order kinetic best described biosorption of Cu(II) by AS. Freundlich model enumerated the equilibrium behaviour of Cu(II) removal by AS. Application of Dubinin-Radushkevic (D- R) model suggested the physio-sorption while Boyd''s model showed liquid film diffusion as the rate controlling step in the biosorption of Cu(II) by AS. Powdered AS was immobilized on the surface of beads which showed moderate BET area. Beads showed best performance (50% break through) at lower flow rate (19.7 mL/min) and low Cu(II) concentration (10 ppm). It was possible to regenerate beads saturated with Cu(II) ions using 0.1M HNO 3 without any damage. Thomas model was applied to describe the break through curves. It isrecommended to further explore the surface immobilization of different biosorbents to test their effect on the breakthrough of different pollutants (binary and tertiary) in fixed bed column.
مولانا احمد سعید افسوس ہے کہ مولانا احمد سعید صاحب صدر جمعیۃ علمائے ہند نے ۴؍ دسمبر کو انتقال فرمایا، مولانا مرحوم ان علمائے دین میں تھے جن کی پوری زندگی ملک و ملت کی خدمت میں گزری۔ وہ جنگ آزادی کے نامور مجاہد تھے اور اس راہ میں بارہا قیدوبند کی مصیبتیں جھیلیں، مولانا کفایت اﷲ صاحب اور مولانا حسین احمد صاحب مرحوم کے بعد اس طبقہ کے علماء میں ایک مولانا احمد سعید ہی کی ذات رہ گئی تھی۔ وہ بھی ہم سے جدا ہوگئے۔ افسوس کز قبیلۂ مجنون کسے نماند دینی، ملی اور سیاسی خدمات کے ساتھ مولانا بڑے خوش بیان خطیب تھے، دلی کی ٹکسالی زبان بولتے تھے، باتیں کرتے تو منہ سے پھول جھڑتے تھے، شرافت اور وضعداری میں بھی دلی کی پرانی تہذیب کا نمونہ تھے، طبعاً بڑے زندہ دل اور خوش مذاق تھے جس محفل میں بیٹھتے تھے اپنی باتوں سے پوری محفل کو مائل کرلیتے تھے۔ عرصہ ہوا ایک سیاسی مقدمہ کے سلسلہ میں ان کو کچھ دنوں اعظم گڑھ میں رہنا پڑا تھا۔ دارالمصنفین میں قیام تھا۔ اعظم گڑھ ہی کی عدالت سے ان کو سزا ہوئی اور یہیں کے جیل میں قید ہوئے، اس لیے مولانا کو قریب سے دیکھنے کا موقع ملا، اسی زمانہ سے ان کے حسن اخلاق اور پرلطف صحبت کا جو نقش قائم ہوا تھا وہ اب تک باقی ہے۔ مولانا اپنے دور کی آخری یادگار تھے۔ اس لیے ان کی وفات سے ایک دور کا خاتمہ ہوگیا، اﷲ تعالیٰ اس خادم دین و ملت کو اپنی بے پایاں رحمت و مغفرت سے سرفراز فرمائے۔ (شاہ معین الدین ندوی، دسمبر ۱۹۵۹ء)
The main objective of this research paper is the study of possible Sharīʻaĥ non-compliance risks (SNCRs) of Ijāraĥ along with their risk management mechanism. As the activity of Sharīʻaĥ non-compliance is negligence or failure to comply with the Sharīʻaĥ rules and regulations as well as for some extent, the breach of the law of the land. Hence, Identification, Monitoring, Control and Mitigation of SNCRs need to be undertaken sensitively otherwise the spirit and objective of Islamic banks (IBIs) will be no more than different from Conventional banking system i.e. Interest based banking. Consequently, this new practice of Islamic banking will also be considered Sharīʻaĥ non-compliant. Because, failure in control and mitigation of Sharīʻaĥ non-compliance risks (SNCRs) may render the transaction into Null and Void (Bāṭil) or Voidable (Fāsid) as well as the return/rental would be considered impermissible (Ḥarām). Additionally, it may expose the status of IBIs at high risk regarding their reputation, profitability and confidence of their stakeholders which may lead the system towards collapse and downfall. Keeping in mind the need of the identification of SNCR along with estimated risk management/mitigation tools, this paper is developed to help the industry to develop their own Sharīʻaĥ non-compliance risk management system and to achieve the targeted outcomes i.e. Sound reputation of Islamic banking on the basis of Sharīʻaĥ principles, permissible proceeds/profits through genuine Sharīʻaĥ compliant activities and comprehensive knowledgeable material to understand distinctive and accurate Islamic banking system from Conventional. Targeting the abovementioned goals and aims, the answers of following questions are explored: What is SNCR? Is there any approved and authentic mechanism or SNCR management system in market to manage and mitigate them? Is the SNCR destructive for the profit and goodwill of IBIs? Principally, this research paper is an effort to uncover the SNCRs of Ijāraĥ Product along with the risk management mechanism keeping in sight the modern practices of Ijāraĥ Product.
The plethora of research highlights the adjustment problems in college/university students (Friedlander, Reid, Shupak, & Cribbie, 2007; Gerensea, Seid, Lamma, & Malloy, 2017; Leary & DeRosier, 2012; Wintre &Yaffe, 2000). However, the research in Pakistani context is still limited. This research attempts to explore the phenomenology of adjustment problems and is comprised of three studies. In study I, adjustment problems scale (APS) was developed through semi structured interviews and focus groups. Exploratory factor analysis (N=450) revealed nine factors (educational problems, interactional problems, shame and guilt, work related stress, psychological problems, teacher related stress, transport problems, sexual harassment issues and financial problems) with significant internal consistency (ɑ=.96, .96, .96, .95, .97, .93, .95, .88, .90 respectively). Confirmatory factor analysis (N=880) was explored on students sample (M= 19.95, SD= 2.54) which revealed the consistent factor structure as emerged on EFA. In study II, psychometric properties of APS were explored. Convergent Validity (N= 300) was explored through subscale (Negative Affect) of College Adjustment Test (Hasan, Kazmi, & Jawahir, 2017) (r=.28, p<.01). Discriminant validity (N=300) was found out by using Psychological Resilience Scale (Jawahir & Kazmi, 2013) (r=-.21) whereas test retest reliability (N=100) of APS with two weeks interval was (r=.91, p<.01). Method of contrasted groups was used to establish the construct validity of APS. In study III, role of adjustment problems was explored in relation to depression, academic achievement and resilience. APS along with demographic sheet, Psychological Resilience scale and Siddiqui Shah Depression Scale was administered on the sample (N=880). Academic achievement was assessed through the percentage of marks obtained by iv students in their 1st semester exams after admission. Results reveal that adjustment problems are significant positive predictor of depression while negative predictor of academic achievement. Resilience is significant negative predictor of adjustment problems. Furthermore, resilience mediates between adjustment problems and depression, adjustment problems and academic achievement. Stepwise regression analysis on the subscales of APS reveals that shame & guilt and psychological problems are significant positive predictors of depression. Financial problems, shame & guilt, work related stress, educational problems and teacher related stress are significant negative predictors of academic achievement. Results further reveal that male students have more adjustment problems as compared to female students. This study will be helpful for campus counselors for the early assessment and management of adjustment problems.