Effect of pandemic based online education on teaching and learning system.

Coronavirus outbreak mediated pandemic impacted most of the sectors globally. This includes the academic world that consists of millions of enrolled learners and active teachers who previously had regular classes in their institutions, and due to the pandemic, got stuck at the home. To continue the education process, the online class was introduced in most of the countries, including India. In this mode, both teaching and learning happen through electronic devices which are relatively new to the entire teaching-learning community. This study aimed to understand how online classes had fared for the teachers and students in India. Besides, it tried to understand the users' experience and the unique set of challenges that this mode of education brings. Four separate questionnaires were created for school students, school teachers, college students, and college professors. The questions inquired about various aspects of online classes such as setting up online education at home, knowledge transfer, comfort, evaluation, and future aspects. The questionnaires were circulated electronically as google forms. The responses were received from the teachers (school teachers and college professors considering all courses) and learners (school and college students considering all courses) of various educational institutions across the country. The data was compiled and the results were discussed in two ways, firstly, the perspectives of teaching versus the learning group and secondly, school versus college groups on online versus regular classes. Though online training/distance education is practiced for a long time, the research on the mentioned aspects was limited. This study is the first of its kind which reflects the merits and demerits of the new-normal online education from home in the compiled voice of teachers and learners group in India. The study addresses the participant's compliments and grievances of online education compared to regular classes. This further enlightens how to improve the technologies to make them use more efficiently. Besides, this study gives a proper framework to modify or create educational policies, laws, and schemes to obtain equal access to resources for all.

An upgraded electro-Fenton treatment of wastewater using nanoclay-embedded graphene composite prepared via exfoliation of pencil rods by submerged liquid plasma.

In this work, two types of electrochemical electrodes were synthesized using two types (i.e., 4 black (4B) and hard black (HB)) of pencil rods during submerged liquid plasma (SLP) process. At high potential (3 kV) electrons, the SLP process offered an effective exfoliation route for the disorientation of the graphite sp2 domain to produce two nanoclay-graphene composite electrodes with a few graphene layers (thickness = 4-9 layers) and high dispersibility (< 19% settlement: 4 h) in polar/non-polar solution (52-53.1% settlement: 4 h). Their performance was then evaluated towards the electro-Fenton (EF) degradation of lindane using a coated Fe3O4 plate (as Fenton catalyst). Accordingly, both 4B- and HB-ENcGe electrodes showed high specific capacitance values (473 and 363 F g-1) at 0.05 A g-1 and excellent triangular charge-discharge patterns (< 9% and 35% reduction of capacitance, respectively after 1000 cycles (charging rate: 0.2 A g-1)). At pH 3 and current density of 6.5 mA cm-2, 4B-ENcGe exhibited superior EF degradation performance (99.4% after 60 min) against 2.5 mg L-1 lindane (H2O2 generation capacity: 2.53 mmol. h-1, current efficiency: 89.4%, and stability: up to 5th cycles). The complete EF-based mineralization of lindane suggests that these electrodes should offer one-step cost-effective treatment for wastewater contaminants.